M08886G-13

M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Features Applications • One 2A common anode LED/Laser driver • LCD/LCoS/DLP Portable and Pico Projectors Rev V1 • Two 1A common anode LED/Laser drivers • Laser Despeckle • Integrated 30Msps 12bit DACs • Automatic real time power control (ColorMinder) • DC-DC converter reference generators to optimize each laser bias voltage • High speed 4 wire interface or slave I2C for register settings download from µC The M08886 is a high efficiency integrated RGB LED/Laser driver with patent pending de-speckle and power save technologies for LCD/LCoS/DLP projection displays. It features ColorMinder - a multilevel automatic laser power control for consistent white balance across temperature variation and laser aging. The M08886 allows for the monitoring of the internal IC junction temperature and the control of external DC-DC converters to generate optimal laser supply. Block Diagram Internal Temp Sensor M08886 xALARM PD Analog MUX APC_IN2 APC_IN1 SO __ CS SI/SDA_S SCK/SCL_S Serial Interface Controller Register Table 30Msps 13bit DAC 4 wire serial and dual I2C SerSel High speed APC clock APC_IN0 APC I0_ON I1_ON I2_ON GA IN OFFS E T GA IN OFFS E T GA IN OFFS E T References Dividers 10Msps 12bit DAC PWM_IN/ xALARM Power save 10Msps 12bit DAC POR 10Msps 12bit DAC Vref Blanking 1A Driver 2A Driver 1A Driver 20MHz Despeckle RegRef{2:0} 3.3V max 3.3V max 3.3V max R/G/B R/G/B DIS R/G/B 1 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 Ordering Information Part Number Package Operating Temperature M08886G-13* -40 °C to 85 °C * The letter “G” designator after the part number indicates that the device is RoHS compliant. The RoHS compliant devices are backwards compatible with 225 °C reflow profiles. Revision History Revision Level Date V1 Release May 2015 F (V3P) Preliminary September 2010 Description Update register references. Update specifications to match characterization data. Edit Functional Description and Register sections. D (V2P) Preliminary June 2010 Corrected pin 21 and 22 description in Table 1-11. C (V1P) Preliminary May 2010 Remove support for external EEPROM and Analog APC. Power dissipation and APC specifications updated. Functional Description updated. B (V2A) Advance June 2009 Changed Format, content unchanged A (V1A) Advance March 2009 Initial release. Datasheet Font Conventions Font Example Italics IOUT0 Words in Italics designate M08886 pins. In this case pin IOUT0. IOUTX A letter “x” or “X” in bold font is a placeholder for channel 0, 1 or 2. When an “x” is used the information applies to all 3 channels. Bold letter “x” apcx_ctrl0[2:1] Explanation IOUTX can mean IOUT0, IOUT1 or IOUT2 or it can mean OUT0, IOUT1 and IOUT2 depending on the context. apcx_ctrl0[2:1] can mean registers apc0_ctrl0[2:1], apc1_ctrl0[2:1] or apc2_ctrl0[2:1] or registers apc0_ctrl0[2:1], apc1_ctrl0[2:1] and apc2_ctrl0[2:1] depending on the context 2 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 Table of Contents Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Datasheet Font Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.0 Product Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 Absolute Maximums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 1.2 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 1.3 Target DAC (RGB sensor target current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 1.4 Laser Current DACs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 1.5 Laser Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 1.6 DC-DC Converters Reference Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 1.7 APC Input Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 1.8 CMOS Pins Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 1.9 Slave I2C Timing Specifications1,2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 1.10 High Speed Serial Interface Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 1.11 M08886 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 1.12 Pin List and Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 1.13 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 2.0 3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.1 Automatic Power Control (APC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 2.2 2.1.1 Simple Implementation of APC Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.1.2 Highly Featured Implementation of APC Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.1.3 Compensating the TIA at the Photodetector Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2.1.4 Laser Offset (threshold) Tracking with APC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 LASER/LED Current DACs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 2.3 2.2.1 Increasing the Maximum LED/Drive Current by Combining Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Laser\LED Voltage Supply Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 2.4 Pulse Width Modulation (PWM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 2.5 Multi Pulse Generator (MPG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 2.6 Power Save Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 2.7 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 2.8 Programmable Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 2.9 Driving a String of LEDs from a High Voltage Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 2.10 Power Sequencing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 2.11 Layout Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 3.0 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 List of Figures Figure 1-1. Typical IOUT0 Current vs Headroom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 1-2. Typical IOUT1 Current vs Headroom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 1-3. Typical IOUT2 Current vs Headroom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 1-4. Typical IOUT0 Current with DC-DC Converter Controlled by REGREF0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 1-5. Slave I2C Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 1-6. Serial Interface Sequential Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 1-7. Serial Interface Random Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 1-8. Serial Interface Sequential Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 1-9. Serial Interface Random Read. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 1-10. M08886 Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 1-11. Sawn QFN32 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Figure 2-1. laser/led Supply Control Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Figure 2-2. Controlling Laser/LED Supply with Three DC-DC Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Figure 2-3. Controlling Laser/LED Supply with Single DC-DC Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Figure 2-4. Multi Pulse Generator Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Figure 2-5. Driving a String of LEDs from a High Voltage Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Figure 2-6. Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Figure 2-7. Power-Down. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 5 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 List of Tables Table 1-1. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 1-2. DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 1-3. Register Settings used for Measurements in Various Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 1-4. Target DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 1-5. Laser Current DACs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 1-6. Laser Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 1-7. DC-DC Converters Reference Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 1-8. APC Input Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 1-9. CMOS Pins Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 1-10. Slave I2C Timing Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 1-11. High Speed Serial Interface Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 1-12. Pin List and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 2-1. Basic Register Configuration for APC Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 2-2. Highly Featured Register Configuration for APC Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 2-3. Clock Selection for PWM and MPG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Table 3-1. M08886 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 1.0 Product Specification 1.1 Absolute Maximums These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reliable operation at these extremes for any length of time is not implied. Table 1-1. Absolute Maximum Ratings Symbol Parameter Rating Units DVDD, ALVDD 1.8 V Digital and Analog Supplies 1.98 V DHVDD, AHVDD 3.3 V Digital and Analog Supplies 3.63 V IOUT0, IOUT1, IOUT2 Output pins for driving LED/Laser - maximum voltage 3.3 V TJCTN Junction Temperature -40 to +125 °C TSTG Storage Temperature -65 to +150 °C I2C/SPI Serial data format select input -0.4 to 3 V APC_IN0, APC_IN1, APC_IN2 RGB Photodiode Feedback Input Voltage -0.4 to ALVDD + 0.4 V IAPC_IN0, IAPC_IN1, IAPC_IN2 RGB Photodiode Feedback Input Current -0.5 to 4 mA I_VREF Current into Reference Voltage Pin -0.12 to +0.12 mA DIS Disable all LED/Laser outputs -0.4 to 3 V I0_ON, I1_ON, I2_ON Enable LED/Laser output -0.4 to 3 V CLK_IN, CS, SI, SCLK, SO SPI inputs and output -0.4 to 3 V SCLK_S, SDA_S I2C interface -0.4 to 3 V -0.4 to DVDD +0.4 V -0.12 to +0.12 mA REGREF_0, REGREF_2 I_REGREF_0, I_REGREF_2 REGREF_1, External DC-DC converter control signal I_REGREF_1, Current into or out of REGREFX pins 7 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.2 Rev V1 DC Characteristics Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD=1.8 V, ALVDD=1.8 V, DHVDD =3.3 V, AHVDD =3.3 V unless otherwise noted. Table 1-2. Symbol DC Characteristics PARAMETER CONDITIONS Min Typ Max Units DVDD 1.8 V supply for digital circuitry 1.71 1.8 1.89 V ALVDD 1.8 V supply for analog circuitry 1.71 1.8 1.89 V DHVDD 3.3 V supply for digital circuitry 3.13 3.3 3.47 V AHVDD 3.3 V supply for analog circuitry 3.13 3.3 3.47 V ILVDD LED Mode Supply Current - 1.8 V Open Loop LED Mode (DVDD and ALVDD)1 Closed Loop LED Mode 17 27 mA 31.5 45 42 55 53 87 Laser Mode Supply Current - 1.8 V Open Loop Laser Mode (DVDD and ALVDD)1 Closed Loop Laser Mode (Despeckle enabled on IOUT0) Standby Current - 1.8 V Standby Mode 5 LED Mode Supply Current - 3.3 V Open Loop LED Mode (DHVDD and AHVDD)1 Closed Loop LED Mode IHVDD Tc 7 11.1 7 12.1 Laser Mode Supply Current - 3.3 V Closed Loop Laser Mode (DHVDD and AHVDD)1 Closed Loop Laser Mode (Despeckle enabled on IOUT0) 21.5 36 20 35 Standby Current - 3.3 V 0.05 Case Temp. Measured on top of M08886 case -40 mA 85 NOTES: 1 Excludes serial interface (SPI/I2C) current and LED/Laser current 8 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support °C M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 1-3. Rev V1 Register Settings used for Measurements in Various Operating Modes Operating Mode Register Settings Open Loop LED Mode 0x00h=40h, 0x02h=08h, 0x08h=0Fh, 0x09h=0Eh, 0x0Fh=0Ah, 0x0Ah=0Eh, 0x0Bh=0Eh, 0x0Eh=01h, 0x1Ah=00h, 0x1Dh=00h, 0x26h=FFh, 0x28h=03h, 0x40h= 06h Open Loop Laser Mode 0x00h=40h, 0x02h=00h, 0x08h=0Fh, 0x09h=0Eh, 0x0Ah=0Eh, 0x0Bh=0Eh, 0x0Eh=01h, 0x0Fh=0Ah, 0x17h=40h, 0x18h=00h, 0x1Ah=54h, 0x1Dh=11h, 0x26h=FFh, 0x28h=00h, 0x40h= 06h Standby Mode 0x00h=40h, 0x02h=08h, 0x04h=00h, 0x05h=00h, 0x06h=00h, 0x07h=00h, 0x08h=01h, 0x09h=01h, 0x0Ah=01h, 0x0Bh=01h, 0x0Ch=40h, 0x0Eh=01h, 0x0Fh=0Ah, 0x26h=FFh, 0x40h= 06h,0x90h=10h Closed Loop LED Mode 0x00h=00h, 0x02h=08h, 0x04h=00h, 0x05h=00h, 0x06h=00h, 0x07h=00h, 0x08h=0Fh, 0x09h=0Eh, 0x0Ah=0Eh, 0x0Bh=0Eh 0x0Eh=00h, 0x0Fh=0Ah, 0x1Ah=00h, 0x1Dh=00h, 0x28h=03h, 0x38h=F4h, 0x3Ch=F2h, 0x40h=F0h, 0x41h=3Ch, 0x90h=00h Closed Loop Laser Mode 0x00h=00h, 0x02h=00h, 0x04h=00h, 0x05h=00h, 0x06h=00h, 0x07h=00h, 0x08h=0Fh, 0x09h=0Eh, 0x0Ah=0Eh, 0x0Bh=0Eh 0x0Eh=00h, 0x0Fh=0Ah, 0x1Ah=54h, 0x1Dh=11h, 0x28h=00h, 0x32h=0Eh, 0x33h=00h, 0x38h=F4h, 0x3Ch=F2h, 0x40h=F0h, 0x41h=3Ch, 0x90h=00h 1.3 Target DAC (RGB sensor target current) Typical values: Tc=25 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-4. Target DAC PARAMETER CONDITIONS Min Typ Max Units Resolution 13 bits Conversion rate 30 Msps Full scale monitor photodetector current 3.4 mA Step size 412 nA 9 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.4 Rev V1 Laser Current DACs Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD=1.8 V, ALVDD=1.8 V, DHVDD =3.3 V, AHVDD =3.3 V unless otherwise noted. Table 1-5. Laser Current DACs PARAMETER CONDITIONS Min Typ Max Units Resolution 12 bits Conversion rate 30 Msps Full scale IOUT0 Current sunk at pin IOUT0 with bench power supply sourcing current and voltage adjusted so output headroom is 500 mV 1.85 2 2.25 A Full scale IOUT1 Current sunk at pin IOUT1 with bench power supply sourcing current and voltage adjusted so output headroom is 500 mV 0.9 1.02 1.15 A Full scale IOUT2 Current sunk at pin IOUT2 with bench power supply sourcing current and voltage adjusted so output headroom is 500 mV 0.85 0.98 1.15 A IOUT0 step size Average step size between 0.5A and 1.5A setting. Current is sourced from a bench power supply with the voltage adjusted for 500 mV headroom. — 493 — µA IOUT1 step size Average step size between 0.25A and 0.75A setting. Current is sourced from a bench power supply with the voltage adjusted for 500 mV headroom. — 249 — µA IOUT2 step size Average step size between 0.25A and 0.75A setting. Current is sourced from a bench power supply with the voltage adjusted for 500 mV headroom. — 241 — µA 10 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 1-1. Typical IOUT0 Current vs Headroom IOUT0 vs HeadRoom @ 500mA setting IOUT0 vs HeadRoom @ 1A Setting 0.6 1.2 0.5 1 0.4 0.8 IOUT0(A) IOUT0 (A) Rev V1 0.3 0.6 0.2 0.4 0.1 0.2 0 0 0 100 200 300 400 500 600 700 0 100 200 HeadRoom (mV) IOUT0 @ -40C IOUT0 @ 25C 300 400 500 600 700 HeadRoom (mV) IOUT0 @ 85C IOUT0 @ -40C IOUT0 @ 25C IOUT0 @ 85C IOUT0 vs HeadRoom @ 2A Setting IOUT0 vs HeadRoom @ 1.5A Setting 2.5 1.8 1.6 2 1.4 IOUT0(A) IOUT0(A) 1.2 1 0.8 1.5 1 0.6 0.4 0.5 0.2 0 0 0 100 200 300 400 500 600 700 0 100 200 HeadRoom(mV) IOUT0 @ -40C IOUT0 @ 25C 300 400 500 600 HeadRoom(mV) IOUT0 @ 85C IOUT0 @ -40C IOUT0 @ 25C IOUT0 @ 85C 11 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support 700 M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 1-2. Typical IOUT1 Current vs Headroom IOUT1 vs HeadRoom @ 250mA Setting IOUT1 vs HeadRoom @ 500mA Setting 0.3 0.6 0.25 0.5 0.2 0.4 IOUT1(A) IOUT1(A) Rev V1 0.15 0.3 0.1 0.2 0.05 0.1 0 0 0 100 200 300 400 500 600 700 0 100 200 IOUT1 @ -40C IOUT1 @ 25C 300 400 500 600 700 HeadRoom(mV) HeadRoom (mV) IOUT1 @ -40C IOUT1 @ 85C IOUT1 @ 25C IOUT1 @ 85C IOUT1 vs HeadRoom @ 1A Setting IOUT1 vs HeadRoom @ 750mA Setting 1.2 0.9 0.8 1 0.7 0.8 IOUT1(A) IOUT1(A) 0.6 0.5 0.4 0.6 0.4 0.3 0.2 0.2 0.1 0 0 0 100 200 300 400 500 600 IOUT1 @ 25C 0 100 200 300 400 500 600 HeadRoom(mV) HeadRoom(mV) IOUT1 @ -40C 700 IOUT1 @ 85C IOUT1 @ -40C IOUT1 @ 25C IOUT1 @ 85 12 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support 700 M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 1-3. Typical IOUT2 Current vs Headroom IOUT2 vs HeadRoom @ 250mA Setting IOUT2 vs HeadRoom @ 500mA Setting 0.3 0.6 0.25 0.5 0.2 0.4 IOUT2(A) IOUT2(A) Rev V1 0.15 0.3 0.1 0.2 0.05 0.1 0 0 0 100 200 300 400 500 600 700 0 100 200 HeadRoom(mV) IOUT2 @ -40C IOUT2 @ 25C 300 400 500 600 700 HeadRoom(mV) IOUT2 @ 85C IOUT2 @ -40C IOUT2 vs HeadRoom @ 750mA Setting IOUT2 @ 25C IOUT2 @ 85C IOUT2 vs HeadRoom @ 1A Setting 1.2 0.8 0.7 1 0.8 0.5 IOUT2(A) IOUT2(A) 0.6 0.4 0.3 0.6 0.4 0.2 0.2 0.1 0 0 0 100 200 300 400 500 600 700 0 100 200 IOUT2 @ -40C IOUT2 @ 25C 300 400 500 600 HeadRoom(mV) HeadRoom(mV) IOUT2 @ 85C IOUT2 @ -40C IOUT2 @ 25C IOUT2 @ 85C 13 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support 700 M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.5 Rev V1 Laser Drivers Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-6. Laser Drivers PARAMETER Maximum allowable headroom1 CONDITIONS Min Typ voltage 20-80% Into 1 Ω electrical output Rise/fall time Max Units 3.3 V 5 ns NOTES: 1 To prevent damage to the output devices the voltage drop across it cannot exceed 3.3 V. Please refer also to power sequencing paragraph and laser driver paragraph. 1.6 DC-DC Converters Reference Generators Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD=1.8 V, ALVDD=1.8 V, DHVDD =3.3 V, AHVDD =3.3 V unless otherwise noted. Table 1-7. DC-DC Converters Reference Generators PARAMETER CONDITIONS Voltage compliance REGREF0,1,2 Maximum load capacitance REGREF0,1,2 Minimum resistive load REGREF0,1,2 Min Typ Max Units 0.3 1.2 2.9 V 5 pF 2.5 kΩ 14 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 1-4. Rev V1 Typical IOUT0 Current with DC-DC Converter Controlled by REGREF0 IOUT0 Actual Current vs Programmed Current with LTC3533 DC-DC Convertor Controlled by REGREF 2000 1750 IOUT0 Measured (mA) 1500 -40 degrees C -20 degrees C 0 degrees C 25 degrees C 75 degrees C 85 degrees C 1250 1000 750 500 250 0 0 250 500 750 1000 1250 1500 1750 2000 IOUT0 Setting (mA) IOUT0 Headroom under REGREF Control over Temperature (LTC3533 sourced with 3.7V supply except a 5V supply was used for IOUT0 currents greater than 1.7A) 600 IOUT0 Headroom (mV) 500 400 -40 degrees C -20 degrees C 0 degrees C 25 degrees C 75 degrees C 85 degrees C 300 200 100 0 0 250 500 750 1000 1250 1500 1750 2000 IOUT0 Setting (mA) 15 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.7 Rev V1 APC Input Characteristics Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD=1.8 V, ALVDD=1.8 V, DHVDD =3.3 V, AHVDD =3.3 V unless otherwise noted. Table 1-8. APC Input Characteristics PARAMETER CONDITIONS Full scale input APC_IN0,1,2 PD capacitance1 APC_IN0,1,2 Input bias APC_IN0,1,2 Min Typ Max Units 3.4 mA 80 pF ALVDD/2 V Maximum Voltage, APC_INX 1.98 V NOTES: 1 Care should be taken in routing of each PD input so that total capacitance on the pin including routing does not exceed 80 pF 1.8 CMOS Pins Characteristics Min and Max values: Tc= -40 °C to 85 °C, DVDD=1.8 V+/-5%, ALVDD=1.8 V+/-5%, DHVDD=3.3 V+/-5%, AHVDD =3.3 V+/-5% unless otherwise noted. Typical values: Tc=25 °C, DVDD=1.8 V, ALVDD=1.8 V, DHVDD =3.3 V, AHVDD =3.3 V unless otherwise noted. Table 1-9. CMOS Pins Characteristics PARAMETER CONDITIONS Min Typ Max Units VIH1 0.65 DVDD 2.75 V VIL 0 0.35 DVDD V VOH DVDD-0.4 DVDD V 0 0.4 V V0L Rise/fall time 2 Maximum load of 5 pF. SPI mode 3 NOTES: 1 Digital pins are (1.8 V devices) 2.5 V (+/-10%) tolerant 2 In I2C mode rise time depends on load and pull up resistor. 16 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support ns M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 Slave I2C Timing Specifications1,2 1.9 Typical values: Tc=25 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-10. Slave I2C Timing Specifications Parameter Symbol (refer to figure below) Min Typ Max Units – – 3.4 MHz Clock Frequency, SCL_S fSCL_SLAVE Clock Pulse Width Low tLOW 160 – – ns Clock Pulse Width High tHIGH 60 – – ns Clock Low to Data Out Valid tAA 0 – 70 ns Start Hold Time tHDSTA 160 – – ns Start Set-up Time tSUSTA 160 – – ns Data In Hold Time tHDDAT 0 – – ns Data In Set-up Time tSUDAT 10 – – ns – 250 – kΩ 160 – – ns 5 – – ns Outputs (SDA_M, SCL_M, RPULL-UP SDA_S and SCL_S) internal pull-up resistor value 3 Stop Set-up Time tSUSTO Data Out Hold Time tDH NOTES: 1 Guaranteed by design and characterization. 2 Specified at recommended operating conditions 3 4.7 kΩ should be added externally. Figure 1-5. Slave I2C Timing 17 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.10 Rev V1 High Speed Serial Interface Timing Specifications Typical values: Tc=25 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-11. High Speed Serial Interface Timing Specifications Parameter Symbol (refer to figure below) Min Typ Max Units 40 MHz Clock Frequency fclk=1/Tclk Data in to clk hold time Tdh 5 ns Data in to clk set-up time Tds 5 ns Enable to clk set up time Tcs 5 ns Enable to clk hold time Tch 5 ns Read data output valid following Tdd rising edge of SCLK 2 9 ns SCLK duty cycle 45 55 % NOTES: 1 Maximum output capacitance of 5 pF. Figure 1-6. Serial Interface Sequential Write 1 2 3 9 10 11 12 13 18 19 20 21 26 27 28 SCLK Tcs xCS Tds Tdh SI 1 0 ad dress (A7 ...A 0) 1 st D ata (D7 ...D 0) 2 nd da ta ( D7 ...D0 ) 3 rd d ata SO Figure 1-7. Serial Interface Random Write 1 2 3 9 10 11 12 13 14 15 16 17 18 19 20 SC LK T ch Tc s T cs xCS T dh SI 1 0 ad dress (A 7 .. .A 0) D ata (D7 ...D0 ) SO 18 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 1-8. Rev V1 Serial Interface Sequential Read 1 2 3 9 10 11 12 13 18 19 20 21 26 27 27 SCLK Tcs xCS Tds SI 8-bit addr es s SO Figure 1-9. 2nd 8- bits MISO 1st 8 -b its M IS O 3r d 8- bits MISO (D7,D6 ....D0) Serial Interface Random Read 1 2 3 9 10 11 12 13 14 15 16 17 18 D6 D5 D4 D3 D2 D1 19 20 SCLK Tens xCS Tds SI 8 -bit ad dress Tdd SO D7 Tdd D0 19 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.11 Rev V1 M08886 Pinout The M08886 is packaged in a 5x5 mm 32-pin QFN package with 0.5 mm pin pitch. 25 32 DHVDD DVDD REGREF2 REGREF1 REGREF0 GND GND IOUT2 IOUT2 Figure 1-10. M08886 Pinout 1 24 SCLK/SCL_S IOUT1 SI/SDA_S IOUT1 SO DHVDD __ CS IOUT0 _____ CLK_IN/ALARM GND, connect to PCB ground with an array of > 9 vias. IOUT0 I0_ON IOUT0 8 17 AHVDD ALVDD VREF APC_IN0 APC_IN1 16 APC_IN2 ALVDD 9 I2_ON DIS ___ I2C/SPI I1_ON 5mm x 5mm 20 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.12 Table 1-12. Rev V1 Pin List and Descriptions Pin List and Descriptions Pin Name Type Function 1 and 4 DHVDD Supply 3.3 V digital supply 2 and 3 IOUT1 Analog 1A LED/Laser driver output 5, 6 and 7 IOUT0 Analog 2A LED/Laser driver output 8 I2C/SPI CMOS(PD) 9 and 14 ALVDD Supply 1.8 V analog supply 10 APC_IN2 Analog Monitor PD input 2 (assignable) 11 APC_IN1 Analog Monitor PD input 1 (assignable) 12 APC_IN0 Analog Monitor PD input 0 (assignable) 13 VREF Analog Current reference generator 15 AHVDD Supply 3.3 V analog supply 16 DIS CMOS(PU) Disable all laser drivers 17 I2_ON CMOS(PD) Turns on driver 2 18 I1_ON CMOS(PD) Turns on driver 1 19 I0_ON CMOS(PD) Turns on driver 0 20 CLK_IN/ALARM CMOS 21 CS Open Drain (PU) Serial enable 22 SO Open Drain (PU) Serial data out 23 SI/SDA_S Open Drain (PU) Serial data in/I2C data slave 24 SCLK/SCL_S Open Drain (PU) Serial clock/I2C clock slave 25 DVDD Supply 1.8 V digital supply 26 REGREF2 Analog Regulator reference output 2 (assignable) 27 REGREF1 Analog Regulator reference output 1 (assignable) 28 REGREF0 Analog Regulator reference output 0 (assignable) 29 and 30 GND Supply Ground 31 and 32 IOUT2 Analog 1A driver output center pad GND Supply Electrical and Thermal Ground (must be connected electrically) Serial interface select (L=I2C,H=SPI) External clock input or alarm output NOTE: PD means pulled down, PU means pulled up. 21 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 1.13 Rev V1 Package Information Figure 1-11. Sawn QFN32 Package Information 22 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 2.0 Functional Description The M08886 is a highly integrated laser/led driver for LCD/LCoS laser/led projection display applications. It provides control and monitoring of up to three LEDs/lasers (typically RGB: red, green and blue) and monitoring and control of temperature and DC-DC converters reference generators for optimal laser/led supply. The RGB laser/led front end consists of three 12-bit current output digital to analog converters (DACs) and three high efficiency laser drivers with de-speckle technology. The current generated by each DAC is the sum of two components - an offset component (corresponding to the threshold current of the laser, set offset to 0 for LEDs) and a gain component corresponding to the video information. During projection, the laser/LED current can be controlled by writing the desired current directly to the output DAC or the Laser/LED current can be controlled by an external photodetector. In this case ColorMinder Automatic Power control loop (APC) continually adjusts the gain component of the laser/led current to hold the photodiode current constant during its “on time” and therefore the optical power of the laser/led is held constant at the desired value. The APC will match the photodetector current corresponding to the laser/led turned on at that moment with the current programmed by the video processor for the 13bit target analog to digital converter as the target. The current generated by the target DAC corresponds therefore to the desired optical power level. The APC adjusts the laser/led drive currents in order to maintain the appropriate optical power. The optical power is adjusted every time a color is on during a frame or a portion of it. The threshold current for the lasers (offset portion of the DAC currents) are also automatically adjusted by the APC loop during the blanking period (I0_ON, I1_ON and I2_ON all low) or they can be programmed by the user. The M08886 internally monitors the required laser/led driver headroom and sends a control signal to an external DC-DC converters to optimally adjust each laser/led’s supply voltage. The M08886 internal registers are loaded from an external microcontroller through a slave I2C interface or a 4-wire high speed interface. The host µcontroller can monitor and read back the analog to digital converter outputs either though the slave I2C or the SPI interface. 2.1 Automatic Power Control (APC) ColorMinder automatic power control (APC) can keep the laser/led power constant and the color balanced by comparing the monitor photodetector (RGB color sensor) currents to target values programmed into the 13-bit target DACs. At power-up the APC can be enabled/disabled independently for each channel by setting apcx_ctrl0[2:1]=11. For channels with disabled APC the laser/led currents are controlled through the serial interface using bits ioutx_gain[11:0]. It is possible to freeze the APC loop for each channel by using loop_ctrl[2:0]. In this case the M08886 will stop updating the gain or offset IOUTx currents independently of the state of Ix_ON pins. 23 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 The photodiode (RGB sensor) target values are programmed via the serial interface in registers target2[12:0], target1[12:0] and target0[12:0] respectively for IOUT2, IOUT1 and IOUT0. When the corresponding color is turned on as signaled by the transition of I0_ON, I1_ON or I2_ON from low to high the LED/Laser drive currents are automatically adjusted up or down to always make the photodetector current (RGB sensor current) match the target current. If desired, these target currents can be adjusted on a frame by frame basis to optimize contrast and save battery power depending on the brightness required for a particular frame. When an Ix_ON signal is enabled (low to high transition) the new APC target is strobed in and the proper incoming monitor photodetector current is selected to control the output current by an analog multiplexer from APC_IN0, APC_IN1 or APC_IN2. For each output channel the photodetector input corresponding can be selected using apcx_ctrl0[2:1]. This allows the use of multiple independent photodetectors such as a 3 channel RGB color sensor with color filters optimized for each channel or instead a single broadband (color insensitive) photodetector can be used for all 3 channels. If a single broadband photodetector is used and connected to APC_IN0 all the apcx_ctrl0[2:1] should be set to 00b. 2.1.1 Simple Implementation of APC Control In addition to the controls described in this section, also see the section below on the TIA. If the APC targets are not changing frame by frame, a basic register configuration can be used as shown below. Table 2-1. Name Basic Register Configuration for APC Control Address Recommend Setting loop_ctrl 0x29h apc0_ctrl0[2:1] 0x40h[2:1] 00000xx0b apc1_ctrl0[2:1] 0x3Ch[2:1] 00000xx0b apc2_ctrl0[2:1] 0x38h[2:1] 00000xx0b targetxith_msb 0x2Ch, 0x2Dh, 0x30h, 0x31h, 0x34h, 0x35h 00h targetxith_lsb targetx_msb 0x2Ah, 0x2Eh, 0x32h 000xxxxxb Description 00h Select which photodiode (RGB sensor) input will control which output. Setting depends on hardware connection to photodiode(s) and which channels will use APC control. See Register description for details. Set the laser offset (threshold) at 0. See section on Despeckle for use of laser offset. Set the gain target at desired level 0x2Bh, 0x2Fh, 0x33h targetx_lsb xxh apc0_ctrl2 0x3Eh apc1_ctrl2 0x3Ah apc2_ctrl2 0x36h apc0_ctrl1 0x3Fh apc1_ctrl1 0x3Bh apc2_ctrl1 0x37h 00h Set the clock step to 0 for controlling the step response of the output 03h Clock divide set to 16. The APC controller increases or decreases the value of the gain portion of the laser/led IOUTX current so the photodetector current will match the gain target current for that channel. 24 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 If more than one laser/led is turned on (2 or 3 of I0_ON, I1_ON or I2_ON are high at the same time) the M08886 freezes the update of the APC loop for as long as more then one of the Ix_ON signal is on. This prevents the APC loop from using wrong photodetector information in case a single photodetector is used with no color filter. It should be noted that 2 or more low to high transitions of any of the I0_ON, I1_ON or I2_ON within 200 ns of each other will violate internal timing and will result in unpredictable operation. Care should be taken to prevent damage to the part when multiple laser/leds are enabled. The power dissipation of the part should be kept below the level that will result in a die temperature exceeding 125 °C. 2.1.2 Table 2-2. Name loop_ctrl Highly Featured Implementation of APC Control Highly Featured Register Configuration for APC Control Address 0x29h Recommend Setting 00h Description Setting 0x29h[7:5]=111b may be useful for very low EMI applications with slow current slew on the outputs. Set 0x29h[3]=1b when using an external clock in PWM or MPG mode. apc0_ctrl0[2:1] 0x40h[2:1] 00000xx0b apc1_ctrl0[2:1] 0x3Ch[2:1] 00000xx0b apc2_ctrl0[2:1] 0x38h[2:1] 00000xx0b targetxith_msb 0x2Ch, 0x2Dh, 0x30h, 0x31h, 0x34h, 0x35h 00h targetxith_lsb targetx_msb 0x2Ah, 0x2Eh, 0x32h 000xxxxxb Select which photodiode (RGB sensor) input will control which output. Setting depends on hardware connection to photodiode(s) and which channels will use APC control. See Register description for details. Set the laser offset (threshold) at 0. See section on Despeckle for use of laser offset. Set the gain target at desired level 0x2Bh, 0x2Fh, 0x33h targetx_lsb xxh apc0_ctrl2 0x3Eh apc1_ctrl2 0x3Ah apc2_ctrl2 0x36h apc0_ctrl1 0x3Fh apc1_ctrl1 0x3Bh apc2_ctrl1 0x37h A8h This setting may vary depending on photodiode capacitance, desired risetime and how much overshoot can be tolerated. 92h This setting may vary depending on photodiode capacitance, desired risetime and how much overshoot can be tolerated One of the reasons to choose a more complicated APC control method is modulation of frame-to-frame illumination. Modulating the output amplitude of the Laser/LED can increase the contrast in an image and it can improve battery life. Changes in the LED/Laser output on a frame-by frame basis requires that the LED/Laser “step” to the new APC target amplitude in a fraction of the frame time. The fast step to a new level requires that some care be taken in the feedback response of the photodetector and LED/Laser. Other reasons to choose a more complicated APC control method might be slew rate control of the outputs for EMI or DC-DC converter stability reasons. In this case the feedback response does not require as much consideration. The primary methods for adjusting the feedback response of the photodetector are in registers apcx_ctrl2,1,0. The TIA response will also need to be compensated as described in the section below. 25 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 The digital APC loop is designed to settle to the desired optical output power in 5 µs: the optical power measured in the subsequent 5 µs should be within +/-1% of the desired value. To achieve optimal settling time, the APC loop must be adjusted to the laser/led/monitor photodetector characteristics. Each IOUTX slew rate is independently controllable in 3 time intervals. The first time interval begins when Ix_ON goes high and the length of the first time interval is defined in apcx_ctrl2[7:6] and is from 0 to 255 clock cycles. The length of the second time interval is defined in apcx_ctrl2[5:4] and is from 0 to 127 clock cycles. The length of the third time interval is defined in apcx_ctrl2[3:2] and is from 0 to 127 clock cycles. There is a fourth time interval which is not definable which is from the end of the third time interval until the time when Ix_ON goes low. The APC clock is the system clock divided by 3. The PWM and MPG clock is the system clock divided by 16 and may be further divided by register clk_div[7:0]. The source of the system clock is set in register despeckle_clk[1:0]. If only LED light sources are used (despeckle for lasers not needed) then power consumption can be minimized by selecting despeckle_clk[1:0]=11b and osc_ctrl[3]=1b. If the despeckle feature is used then despeckle_clk[1:0]=00b and osc_ctrl[3]=0b and the clock frequency can be tuned at osc_ctrl[2:0]. The APC clock for each channel may be divided (apcx_ctrl1[1:0]) and the point at which the clock division begins following Ix_ON high (apcx_ctrl2[1:0]) can also be set. So a clock cycle in an early interval may be different than a clock cycle in a later interval. And the change in clock rate may occur in the middle of an interval. Decimation may also be enabled for any of the APC channels at apcx_ctrl0[7:5]. If decimation is enabled then the APC loop will not correct the output current until the measured photodiode current doesn't match the target photodiode current several measurements in a row with the same polarity (too high or too low). The number of consecutive measurements required of the same polarity is determined by the decimation factor. During the first time interval following Ix_ON high the corresponding IOUTX output current will increase by an amount defined in apcx_ctrl1[7:6] each clock cycle if the photodetector current is less than the target current set in targetx_msb and targetx_lsb and it will decrease by that amount each clock cycle that the photodetector current is less than the target current. Similarly during the second time interval the IOUTX output current will increase/ decrease by an amount defined in apcx_ctrl1[5:4] each clock cycle if the photodetector current is less/greater than the target current. During the third and fourth intervals the step size is always one LSB. The OUT0 LSB is nominally 488 µA. The OUT1 and OUT2 LSBs are nominally 244 µA. The overshoot of the OUTX output current will be at a maximum during the first time interval where the current step is greatest. It will be proportional to the current defined in apcx_ctrl1[7:6] and it will also be a function of the loop delay which is approximately 3 clock cycles. Either an over-damped or under-damped response may independently be programmed into the response of the M08886 output channels as desired. The target DAC has a conversion rate of 30 MSPS and the full scale value is 3 mA with a resolution of 13 bit or 0.366 µA. As an example, if the full scale photodetector value is 200 µA, the possible selectable power levels are up to 546 decimal (200 µA /0.366 µA). In this example, full scale will correspond to a target DAC (targetx[12:0]) value of 111h and no power will correspond to 0h. 2.1.3 Compensating the TIA at the Photodetector Input The maximum photodetector current supported by the M08886 is 3 mA. Because of the different characteristics of each photodetector/laser/led the user should select the proper analog filter network for each of the channels by programming tia_ctrl[1:0]. 26 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 2.1.4 Rev V1 Laser Offset (threshold) Tracking with APC If lasers are being used instead of LEDs, the M08886 has the capability to automatically adjust offset (laser threshold) as well as gain. In most cases it is sufficient to only use the gain portion of APC control with a laser and the offset controls can be ignored. If the despeckle function is being used, offset tracking is a useful option. The offset portion of the DAC currents is adjusted during the blanking signal following the period where the laser is on. The blanking period is automatically recognized by the M08886 as the period during which all the colors are off (I0_ON, I1_ON and I2_ON are all low). During that period the target DAC is switched to the user programmed target for the offset current and the M08886 will output and adjust only the offset (laser threshold) portion of the DAC, each of the 3 laser drivers will output only the current corresponding to the threshold (offset DAC current) and the automatic power control loop will adjust the threshold during that period. The offset target for each of the lasers can be programmed using following registers target2_ith[12:0], target1_ith[12:0] and target0_ith[12:0]. The offset target should be chosen low enough as to not interfere with the blanking and high enough to allow meaningful feedback for the APC loop. The decimation factor for offset control is set in register dec_off_ctrl[2:0]. The offset current will not be corrected until multiple occurrences of offset error are detected with the same polarity (too high or too low). The number of consecutive errors required before a correction is made is determined by the decimation factor. During each blanking period the M08886 current starts from the previously determined and stored laser offset current. The laser driver will be able to track laser threshold variation even for short blanking periods because laser threshold varies slowly (typically based on temperature variation and laser aging). The minimum allowed blanking signal is 200 nsec. Laser threshold tracking by means of APC can be disabled individually at power-up for each channel using apcx_ctrl0[4] and it is automatically disabled if apcx_ctrl0[2:1]=11b (APC disabled). The threshold current can be programmed in the part for each of the lasers using bits ioutx_offset[11:0]. If the programmed offset current does not track (with temperature and laser aging) the actual laser offset, the APC settling might be slowed down or laser power overshoot at turn-on might occur. When the APC for the offset current is disabled the part will automatically output 0 current for all the lasers during blanking. 2.2 LASER/LED Current DACs The M08886 includes three monotonic digital to analog converters (DACs) which generate the currents for the three laser/leds, the current is converted from a digital code given by the sum of the offset (laser threshold) and gain (video information). The offset and gain values can be either updated via registers or by the APC loop as described in the previous paragraph. The three laser/led DACs have a range scaled to the laser/led driver output of 0 to 1A for IOUT1 and IOUT2 and 0 to 2A for IOUT0, a resolution of 12 bits and an update rate of 30 MSPS. The integrated laser/led drivers deliver the DACs current to the laser/led diodes. The drivers include MACOM proprietary de-speckle feature which significantly reduces appearance of speckle in laser light by means of high speed modulation of the laser driver current. The de-speckle feature can be simply enabled or disabled via register despeckle_ctrl[7:0]. With the APC loop enabled, the M08886 automatically adjusts the power level and no other adjustments are required. If open loop is used then laser power calibration must be performed with the de-speckle feature enabled. 27 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 Each laser/led driver output (IOUTx) is controlled by the corresponding ON signal (Ix_ON). Rise/fall time from the laser/led driver is typically 2 ns into a resistive electrical load. The risetime will be dominated by the DC-DC converter settling time in applications where a single DC-DC converter output voltage tracks the optimal LED/laser anode voltage. To match the significantly slower rise and fall time of the LCD/LCoS the M08886 features a programmable delay which can shift the turn-on of the laser/led once the corresponding ON signal goes to high. The delay is implemented as a programmable 10bit counter that counts clock cycles of the internal clock selected at register 0x28h[1:0] divided by 16. (either 320 MHz or 42 MHz may be selected). If the 320 MHz/16 oscillator is selected then 19.5 MHz clock cycles are counted at the rising edge of each laser/led ON signal (I0_ON, I1_ON and I2_ON) the counter is decremented and the laser/led is actually turned on only when the counter reaches 0. The laser/led is turned off on the falling edge of the corresponding laser/led ON signal (I0_ON, I1_ON, I2_ON). The maximum delay achievable is therefore 52.4 µs if the 320 MHz/16 clock is selected (1023 times the 50 ns period of the 19.5 MHz internal oscillator). Additional delay can be achieved by using the M08886 programmable divider of the internal clock. The internal clock can be divided down by a factor of 1, 2, 4, 16, 256, 512, 1024, and 2048. This can be obtained by writing register clk_div[7:4]. The values of the programmable counter for the red, green and blue laser/led are stored in bits on_count2[9:0], on_count1[9:0], and on_count0[9:0] respectively. The rising edge of the Ix_ON signals strobe the corresponding on_countx[9:0] value into the M08886 timing controller therefore if the on_count register value is changed during the on time for that color the effect of the register change will be available during the next color cycle. If the on_countx is programmed to 00 0000 0000b the PWM feature is disabled for IOUTx. 2.2.1 Increasing the Maximum LED/Drive Current by Combining Outputs When multiple channels (2 or 3) of the M8886 inputs and outputs are shorted together to obtain a single higher current channel then set opmode_ctrl0[5]=1b. The Ix_ON should be shorted together for the channels that are being combined and if they are not shorted their state changes should occur within 10 ns of each other. It should be pointed out that the M08886 has a single bias generating circuit which is toggled between different output stages depending on the Ix_ON. The architecture is such that, when multiple outputs are enabled, the biasing is generated from one of them (the one with the lowest channel number) and fed to the other channel. Because of typical circuit fabrication variations and mismatches the current out of a certain channel may therefore vary between the case when the channel is operated independently vs. the case when channel is operated in conjunction with another as when a channel is operated independently the biasing is generated by its own biasing circuit. This does not impact the current stability over supply and temperature of the current generated by each channel. For example, if channel 0 and channel 1 are shorted at the input and output the biasing for channel 1 is now controlled by channel 0. 2.3 28 Laser\LED Voltage Supply Control By controlling the Laser\LED anode voltage with the REGREF outputs the M08886 can optimize (minimize) the voltage on the output drive pins to the level that insures accurate current drive levels and minimizes power dissipation. Nominally the outputs need 350 mV of headroom but the M08886 will determine the actual level. An internal amplifier is used to monitor the output stage voltage drop and to compare it against an internal reference M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 voltage coming from a replica circuit. The output of the amplifier at the REGREF pins will control the feedback input of a DC-DC converter to adjust the output voltage (LED or Laser anode voltage) of the DC-DC converter. The block diagram below illustrates the use of this feature in the system. Figure 2-1. laser/led Supply Control Block Diagram Laser \LED Supply R1 R/G/B VOUT DC-DC R2 VFB IOUT REGREF A REPLICA LDD LDD M08886 In fact there are three laser/leds and therefore three channels in the REGREF. The following block diagram shows the three channels together. Figure 2-2. Controlling Laser/LED Supply with Three DC-DC Converters Off chip components Laser Supply R/G/B R21 VOUT R22 DC-DC IOUT2 R/G/B VFB R11 VOUT R12 DC-DC IOUT1 VFB R02 VFB REGREF1 A2 REPLICA LDD2 R01 VOUT DC-DC IOUT0 REGREF2 LDD2 R/G/B REGREF0 A1 LDD1 REPLICA LDD1 A0 LDD0 REPLICA LDD0 M08886 29 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 In case a single DC-DC converter is used, REGREF0 can be multiplexed automatically between three output values. The following block diagram shows this configuration. The strobe signal for each of the three preprogrammed output of headroom setting DAC can be independently programmed to be the falling or raising edge of the Ix_ON signals. This feature allows a single DC-DC converter to be used to generate the supply for all the laser/leds independently of the order of color cycling in the projector system. When the falling edge is selected, one of the two possible color sequence needs to be selected by using opmode_ctrl1[5]. Figure 2-3. Controlling Laser/LED Supply with Single DC-DC Converter Off chip components Laser Supply R/G/B R/G/B R/G/B R1 VOUT R2 DC-DC IOUT2 IOUT1 IOUT0 REGREF2 REGREF1 REPLICA LDD2 REGREF0 A1 A2 LDD2 VFB LDD1 REPLICA LDD1 A0 LDD0 REPLICA LDD0 Ix_ON M08886 The M08886 internal circuitry will regulate the voltage at each of the IOUTx pins during the operation of the laser/ led to a voltage equal to the required headroom of the laser/led driver in the actual operating condition by mean of adjusting the external DC-DC converter feedback point or reference voltage. The replica circuit can be programmed to be a fixed 250 mV instead of the actual replica voltage, using out_ctrlx [7]. It should be noticed that the laser/led drop will depend on the intrinsic drop across the laser/leds (Vth) plus any drop caused by the series resistance, this includes the laser/led series resistance plus routing resistance on board and in the laser/led package, therefore the voltage drop across the laser/led needs to be adjusted under actual load conditions. This can be done for each IOUTx through bits out_ctrlx [6:4] regardless of the fact that the actual replica is used or the 250 mV fixed voltage. To guarantee proper operation of the laser/led driver the loop controlling the laser/led supply should be faster then the required APC settling time. The overall supply control loop includes the M08886 and the DC-DC converter. The M08886 supply control path has a first pole at 30 MHz assuming a 5 pF load which should allow the loop to be stable assuming the DC-DC converter has a response time of tens of µs or faster. The load on REGREFx pins has a major effect on the internal circuitry of the part and care should be taken to minimize the loading and noise injection at this pin. For added flexibility and to help stability for different DC-DC converters, the gain of the difference amplifier can be programmed for each channel by means of regrefx_ctrl[4:2]. 30 In case a single DC-DC converter is used, REGREF0 can be multiplexed automatically between three output values. The strobe signal for each of the three pre-programmed output of headroom setting DAC can be independently programmed to be the falling or raising edge of the Ix_ON signals. This feature allows a single DCM/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 DC converter to be used to generate the supply for all the laser/leds independently of the order of color cycling in the projector system. When the falling edge is selected, one of the two possible color sequence needs to be selected by using opmode_ctrl1[5]. In order to protect the high speed circuitry of the laser/led driver from the high voltage supply at the anodes of the laser/leds, it is imperative that a small quantity of current flow through the laser/led so that the laser/led forward voltage lowers the voltage at the M08886 output pin. The voltage at the laser/led driver output should never exceed 3.63 V therefore an external resistor should be added between the laser/led cathode and ground. The value of the resistor should be chosen so the current flowing is enough to create a sufficient voltage drop on the laser/led. The APC loop will automatically compensate for this “off” current. If the APC loop is disabled and the M08886 is operated open loop this current should be accounted for when programming the desired currents in the system calibration phase. When a single DC-DC converter is used, care should be taken to guarantee that the voltage drop across the red and green laser/led is such that, when the supply is regulated for operation with the highest voltage laser/led, the voltage at all driver pins never exceeds 3.63 V. Alternative methods to protect the output pins might include a schottky diode to the 3.3 V supply or very low voltage zener. 2.4 Pulse Width Modulation (PWM) The high divider ratios of the internal clock divider (256, 512, 1024, 2048) in conjunction with the programmable counter can be used to decrease the amount of time each laser is on. The optical power can then be controlled by modulating the pulse width of each color pulse. This can yield substantial power savings in laser applications. The internal ring oscillator varies by +/-15% over parts, temperature and supply and this can directly translate into color intensity variation. The M08886 features a clock input where a high precision clock can be fed to the part and used for this power saving feature. A common 19.44 MHz crystal oscillator or a resonator can be used for this purpose or any high precision clock already available in the system. The precision of PWM power control is directly proportional to the clock accuracy. The PWM block is designed to operate with a maximum frequency of 25 MHz. If CLK_IN is higher then 25 MHz then the CLK_IN divider should be enabled and set to 2 or 4 at register clk_ctrl[2:1] to appropriately scale the frequency. A maximum external clock of 100 MHz is allowed but the internal PWM block can operate at a maximum speed of 25 MHz. External clocks of less than 19.44 MHz are also allowed. The PWM generator then will work at the speed of the CLK_IN (assuming no divider is enabled). The external clock can be selected with register loop_ctrl[3]. Table 2-3. Clock Selection for PWM and MPG Register Setting Description Laser Mode 0x28h[1:0]=00b 320 MHz system clock selected. PWM and MPG clock is this clock divided by 16 LED Mode 0x28h[1:0]=11b 42 MHz system clock selected PWM and MPG clock is this clock divided by 16 2.5 Multi Pulse Generator (MPG) The M08886 allows for the drive of any of the laser/leds by means of multiple pulses. The multi-pulse generator (MPG) operates in a manner similar to the PWM generator. For each of the laser/leds, two 10-bit counters specify the number of internal clock cycles during which the laser/led associated with them is kept on (gain plus offset 31 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 current) and off (0 current). Similar to the PWM block, the MPG block can also use an external clock signal (CLK_IN). Assuming the 320 MHz/16 internal oscillator is used, the duty cycle of the pulsed waveform can be controlled with a resolution of one 19.5 MHz clock period or 51.28 ns. If both counters are loaded with the maximum value (1023) the signal driving the laser/led will be a square wave of period 102 µs (9.775 kHz). If an external clock is supplied the maximum resolution achievable is 40 ns (25 MHz clock). The MPG clock can be divided by a factor of 1, 2, 4, 16, 256, 512, 1024, and 2048. This can be obtained by writing register clk_div[3:0]. Register clk_div[3:0] is independent of the divider ratio used in the PWM mode (clk_div[7:4]). In general the maximum obtainable period for the multi-pulse waveform is 2046 times the clock period (2 times 1023 times the clock period), in this case the duty cycle of the multi-pulse waveform will be 50%. Because of the 10-bit counter, the duty cycle resolution obtainable is 1/1023 or better then 0.1% assuming the highest count value is used for one of the counters. The duty cycle control resolution is inversely proportional to the maximum counter value. The control for the IOUT0, IOUT1, IOUT2 laser/led on pulses are programmed respectively in the following registers: pulse_on2[9:0], pulse_on1[9:0] and pulse_on0[9:0]. The rising edge of the Ix_ON signals strobe the corresponding pulse_on/offx[9:0] values into the M08886 timing controller. If the pulse_on/pulse_off register value is changed during the on time for that color the effect of the register change will not occur until the next rising edge of that Ix_ON. If the pulse_on or pulse_off for a channel is programmed to 000h then the MPG function is disabled for that channel. The MPG function is independent of the PWM function: the “On delay time” (PWM function), the “Pulse on time” and “Pulse off time” (MPG functions) can be programmed independently. Also the clock divider for the “On delay time” the “Pulse on/off time” can be selected independently allowing flexibility in defining the driving signals. This is illustrated by the following diagram, where an example for the green laser assigned to channel 0 is represented: the green on signal (I0_ON) and laser current output (IOUT0) are drawn. Figure 2-4. Multi Pulse Generator Timing I0_ON IOUT0 On delay time Pulse on time Pulse off time 30% frame time 32 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 2.6 Rev V1 Power Save Features Both the APC and the PWM features can be used to obtain significant system power savings. The capability of M08886 APC to adjust the laser/led outputs frame by frame allows for significant power savings compared to leaving the laser/leds on all the time at full power. If frame by frame APC is used, then the external µcontroller will store a new 2 byte value in the target DAC for the next power level for each color power that is changing prior to displaying the new frame. PWM mode also leads to significant power reduction versus standard amplitude modulation. With PWM mode before the display of every new frame the external µcontroller should specify for each color the delay required for pulse width modulation by programming the counter of each color. This can be done by writing four 8-bit registers. Both power saving methods can be used simultaneously (on different color sources) to obtain the maximum power savings and control over color content of each frame. The MPG block can also be used as a power saving feature where the color intensity is modulated by varying the duty cycle of the pulsed waveform. In this case the pulse_on/off registers for every laser need to be programmed to the value corresponding to that frame for a total of eight 8-bit register writes for each new frame. When using MPG with duty cycle modulation for power save mode, accurate power control can be achieved without the use of external clock because internal oscillator variations affect both the on and off period hence the ratio between on/off time remains constant. However, if a very limited number of multiple pulses are used during a frame the internal oscillator variations might impact laser power accuracy. 2.7 Safety A disable pin (DIS) is available on the M08886. It disconnects the laser/LED path to ground within 1 µs of a low to high transition of DIS the laser/led driver current is reduced to 1/10th of its starting value. A register alarm is also available: the safety monitor block compares the output current of each laser/led with 3 thresholds (one for each of the laser/leds) and an alarm is issued if the current is higher than the programmed threshold for any of the lasers/LEDs. The digital thresholds can be programmed in the following registers: alarm_thx[7:0], these values will be compared to the MSB of the output current. If CLK_IN is not being used by MPG or PWM then the pin can be used as an alarm output and external circuitry can be used to shut down power to the laser/leds. Or the alarm status may be read back from register alarm[7:0]. Register Alarm[7:0] is not self clearing: once an alarm has occurred, it must be cleared by the user by writing a 1 to strbalrm_ctrl[0]. The M08886 can also be programmed (opmode_ctrl1[3]) to automatically disable the laser/LED outputs when the drive current exceeds the programmed threshold. In this case the laser/led current for that particular laser/led is automatically forced to 0. This feature can be disabled via registers. The ALARM pin is an open collector output and can operate in status mode or interrupt mode. This can be selected at register opmode_ctrl0[3]. In status mode the alarm is provided directly to the pin and the pin will be asserted as long as the alarm is present. In some cases the alarm may only be present for only one clock cycle of the internal high speed clock. If the external load on ALARM pin is excessive the alarm signal may not appear at the output because one clock cycle is only 10 ns (100 MHz clock). In interrupt mode the M08886 will issue a positive going pulse on the alarm pin every time the internal alarm changes state. The width of the alarm pulse can be programmed at register opmode_ctrl0[3:0]. 33 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 The output stage can also be disabled by the user at register opmode_ctrl1[1:0]. 2.8 Programmable Serial Interface The M08886 can be configured to use a 4-wire high speed serial interface or I2C. This can be achieved by connecting pin SerSel high or low respectively. When the part is configured to use I2C an external host µController can access the register and read-back ADC codes from the slave I2C (SDA_S/SCL_S). The maximum SCL_S clock rate is 3.4 MHz. 4.7 kΩ pull up resistors should be used at SDA_S/SCL_S. These pins are referenced to 1.8 V inside the M08886 but it is OK to connect the pull-up resistors to voltages as high as 2.5 V. The I2C slave address of the M08886 is fixed at 9Ch/9Dh. The 4-wire high speed interface (SCLC/SI/SO/CS) supports 40 MHz serial clock speeds. 2.9 Driving a String of LEDs from a High Voltage Supply An M08886 can be used to drive a string of LEDs as shown in Figure 2-5 below. The M08886 must be isolated from the high voltage by an NFET transistor. The NFET should have a breakdown voltage greater than the high voltage supply and should also have a very low on resistance at 2.5 V gate-source voltage. The Diodes Inc. DMN2075U is an example of a suitable 20 V NFET. 34 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Figure 2-5. Rev V1 Driving a String of LEDs from a High Voltage Supply High Voltage String of LEDs +3.3V N-Channel, low Rds, high Vbr M08886 IOUTX M08886 35 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays 2.10 Rev V1 Power Sequencing Very high speed transistors are used on the M08886 outputs to achieve high efficiency and high performance (low voltage operation and high edge rate). These devices can withstand a maximum voltage of 3.3 V and it is necessary to protect them from the high voltages on the laser/led anodes. Internal protection diodes connect the outputs to the voltage supplies. To obtain reliable operation from the M08886 the power-up and power-down sequencing described in the diagrams below must be followed. Figure 2-6. Power-Up DVDD, ALVDD, AHVDD >10μsec 0V Red, green and blue laser supply 0V Figure 2-7. Power-Down DVDD, ALVDD, AHVDD >1μsec 0V Red, green and blue laser supply 0V 2.11 Layout Considerations The center pad of the package is the electrical ground and the heat sinking path for the M08886. The center pad should be connected to an internal ground plane through an array of 9 or more vias. The accuracy of the internal DACs and the LED/laser drive amplitudes and timing depend on pin VREF being noise-free. The resistor at this pin should be close to the M08886 and the via to ground from the resistor should be nearby. The external DC-DC converter will amplify any noise on the REGREF pins. Care should be taken in routing these pins so they are not parallel to the laser/LED drive signals or clock signals. Decoupling capacitors should be on the same side of the PCB as the M08886 and close to the pin they are decoupling. Vias to ground and voltage supplies should not be shared by components or signals (crosstalk between signals will occur). 36 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 3.0 Registers Table 3-1. Addr M08886 Registers Register Name d7 d6 d5 d4 d3 d2 d1 d0 Default Type General REGISTERS 00h 01h 02h opmode_ctrl0 opmode_ctrl1 osc_ctrl i_fullscale pd_trgetDAC en_IO Sets current full scale: 1: 75% 0: 100% Powers down target DAC: 1: powers down target DAC (Open Loop mode) 0: normal operation (APC active) 1: Enable parallel input reg_num edge seq Number of DC/DC converters: 1: 1 0: 3 Switch regref output on: 1: Ix_ON falling edge 0: Ix_ON rising edge Reserved Color sequence selector in case of falling edge: 1: 2-1-0 0:2-0-1 Reserved RSVD alrm_ctrl 04h clk_ctrl reserved 0: normal operation Reserved alarm_dis Reserved Disable output Reserved on alarm: 1: disable output current on alarm 0: do not disable Soft Disable DIS_bypass 1: IOUTx disabled 0: IOUTx enabled 1: DIS pin ignored 0: DIS pin active osc_pd osc_tune[2:0] 1: Power down oscillator Tune despeckle oscillator frequency 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 000b: 400 MHz 100b: 320 MHz (recommended) 111b: 270 MHz clk_delay alarm_clkin clkin_div[1:0] duty_en Input clock programmable delay: 0000 = no delay 0001 = 500nsec 0010 = 1000nsec … 1111 = 7500nsec 1: Pin 20 is ALARM 0: Pin 20 is CLK_IN CLK_IN input clock divider: 00: 1 01: 2 10: 4 11: 3 1: enable duty cycle contro (Line mode control)l 0: disable duty cycle control (recommended for other modes) RSVD R/W Controls the behavior of the ALARM 1xxx: Status mode 0000: Interrupt mode with 1 cycle pulse width (1cycle=20 ns) 0001: Interrupt mode with 2 cycle pulse width 0010: Interrupt mode with 4 cycle pulse width …. 0111: Interrupt mode with 128 cycle pulse width 0: Normal operation 03h 00001000 37 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 05h out_ctrl2 06h 07h Rev V1 out_ctrl1 out_ctrl0 d7 d6 rep_sel2_cc offset_reg0[2:0] Selects replica voltage or constant voltage 0: replica 1: constant 250 mV d5 d4 d3 d2 d1 d0 Default Type snubber[2:0] pd_iout2 00000000 R/W Adjust replica offset for IOUT2 000: 0 mV 001: 28.5 mV 010: 57 mV … 111: 200 mV Control snubber network for IOUT2 (for use with despeckle to optimize the step response) Master IOUT2 power down: 1: power down 0: enabled rep_sel1 offset_reg1[2:0] snubber[2:0] pd_iout1 00000000 R/W Selects replica voltage or constant voltage 0: replica 1: constant 250 mV Adjust replica offset for IOUT1 000: 0 mV 001: 28.5 mV 010: 57 mV … 111: 200 mV Control snubber network for IOUT1 (for use with despeckle to optimize the step response) Master IOUT1 power down: 1: power down 0: enabled rep_sel0 offset_reg0[2:0] snubber[2:0] pd_iout0 00000000 R/W Selects replica voltage or constant voltage 0: replica 1: constant 250 mV Adjust replica offset for IOUT0 000: 0 mV 001: 28.5 mV 010: 57 mV … 111: 200 mV Control snubber network for IOUT0 Master IOUT0 power down: 1: power down 0: enabled 00000000 R/W 00000000 R/W (for use with despeckle to optimize the step response) 08h reserved Reserved 09h regref2_ctrl enpd_rep2 rep_pd_pol hi_z gm_tail gain[1:0] pol_swap pd regref2 Power down IOUT2 replica when I2_ON is off (other channel 2 settings may affect replica power down timing) 0: no power down 1: powered down Voltage at REGREF2 when replica is powered down 0: 0 V 1: AHVDD REGREF2 output state. This bit will only affect REGREF2 if 0x09h[0]=1 1: REGREF2 is high impedance 0: 0x09h[6] determines state 1: Reduces tail current (gain is reduced to 0.6x) 0: Normal operation 00: 70 01: 32 10: 15 11: 7 Select gm call polarity 1: normal 0: swapped power down REGREF2 1: power down 0: normal operation Loop gain adjustment of DC-DC converter 38 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 0Ah regref1_ctrl d7 d6 d5 d4 d3 d1 d0 Default Type enpd_rep1 rep_pd_pol hi_z gm_tail gain[1:0] pol_swap pd_regref1 00000000 R/W Power down IOUT2 replica when I2_ON is off (other channel 2 settings may affect replica power down timing) Volatage at REGREF1 when replica is powered down 0: 0 V 1: AHVDD REGREF1 output state. This bit will only take affect if 0x0Ah[0]=1 1: REGREF2 is high impedance 0: 0x0Ah[6] determines state 1: Reduces tail current (gain is reduced to 0.6x) 0: Normal operation 00: 70 01: 32 10: 15 11: 7 Select gm call polarity 1: normal 0: swapped power down REGREF1 1: power down 0: normal operation enpd_rep0 rep_pd_pol hi_z gm_tail gain[1:0] pol_swap pd_regref0 00000000 R/W Power down IOUT2 replica when I2_ON is off (other channel 2 settings may affect replica power down timing) 0: no power down 1: powered down Voltage at REGREF0 when replica is powered down 0: 0 V 1: AHVDD REGREF0 output state. This bit will only take affect if 0x0Bh[0]=1 1: REGREF2 is high impedance 0: 0x0Bh[6] determines state 1: Reduces tail current (gain is reduced to 0.6x) 0: Normal operation 00: 70 01: 32 10: 15 11: 7 Select gm call polarity 1: normal 0: swapped power down REGREF0 1: power down 0: normal operation Reserved pd_temp Temp_Sensor_Offset Temp_Sensor_Gain 00000000 R/W 0: Normal Operation Calibrate Temp Sensor Offset Calibrate Temp Sensor Gain 10101010 R/W 0: no power down 1: powered down 0Bh 0Ch Rev V1 regref0_ctrl tempsens_ctrl 1: Power down temp sensor d2 0000: Default 0X: Default 0001: +1 count 10: +2.8% 0001: +2 counts 11: -3.2% ........ 0111: +7 counts 1111: -1 count 1110: -2 counts ...... 1000: -7 counts 0Dh tia_ctrl cpd_comp Additional Cpd compensation for APC 1: 16 pF 0: 0 pF Reserved Rf_ctrl Controls value of Rf: APC TIA gain control: 11: 20kOhms 10/01: 40kOhms 00: 60kOhms 39 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. Rev V1 M08886 Registers Addr Register Name 0Eh apc_fe_ctrl d7 d6 Reserved highcur_en d5 d4 d3 d2 d1 Reserved For common anode d0 Default Type pd_TIA 00001010 R/W 00000000 R/W 1: power down TIA (Open Loop Mode) 0: TIA active (Closed Loop Mode) 00 -> 0.75 mA 01 -> 1.0 mA 10 ->1.25 mA 11-> 1.5 mA For common cathode x0-> 125 µA x1-> 187 µA 0Fh reserved 10h reserved 11h iout2_msb 12h iout2_gain_lsb iout2_gain[11:8] iout2_offset[11:8] IOUT2 gain MSB IOUT2 offset MSB iout2_gain[7:0] 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W IOUT2 gain LSB 13h iout2_offset_lsb iout2_offset[7:0] IOUT2 offset LSB 14h 15h iout1_msb iout1_gain_lsb iout1_gain[11:8] iout1_offset[11:8] IOUT1 gain MSB IOUT1 offset MSB iout1_gain[7:0] IOUT1 gain LSB 16h iout1_offset_lsb iout1_offset[7:0] IOUT1 offset LSB 17h iout0_msb iout0_gain[11:8] iout0_offset[11:8] IOUT0 gain MSB IOUT0 offset MSB 18h iout0_gain_lsb iout0_gain[7:0] 19h iout0_offset_lsb iout0_offset[7:0] IOUT0 gain LSB IOUT0 offset LSB 1Ah despeckle_ctrl despeckle2 despeckle1 despeckle0 Controls despeckle on IOUT2: 00: off 01: On with 0 as OFF current 10: On with offset current as the OFF current 11: On with (offset2offset2_des) as OFF current Controls despeckle on IOUT1: 00: off 01: On with 0 as OFF current 10: On with offset current as the OFF current 11: On with (offset1offset1_des) as OFF current Controls despeckle on IOUT0: 00: off 01: On with 0 as OFF current 10: On with offset current as the OFF current 11: On with (offset0offset0_des) as OFF current Reserved 40 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 1Bh despeckle2 (see register 0x02h[2:0]) 1Ch despeckle1 (see register 0x02h[2:0]) 1Dh despeckle0 (see register 0x02h[2:0]) 1Eh Rev V1 offset0_des_msb d7 d6 d5 d4 d3 d2 despeckle_on2[3:0] despeckle_off2[3:0] Despeckle on time for for IOUT2 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles Despeckle off time for for IOUT2 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles despeckle_on1[3:0] despeckle_off1[3:0] Despeckle on time for for IOUT1 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles Despeckle off time for for IOUT1 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles despeckle_on0[3:0] despeckle_off0[3:0] Despeckle on time for for IOUT0 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles Despeckle off time for for IOUT0 0000=1 320 MHz clock cycle 0001=2 320 MHz clock cycles … 1111=16 320 MHz clock cycles Reserved iout2_off_desp[11:8] d1 d0 Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 11111111 R/W 11111111 R/W 11111111 R/W IOUT2 offset current negative offset for despeckle (MSB) 1Fh offset2_des_lsb iout2_off_desp[7:0] IOUT2 offset current negative offset for despeckle 20h offset1_des_msb Reserved iout1_off_desp[11:8] IOUT1 offset current negative offset for despeckle (MSB) 21h offset1_des_lsb iout1_off_desp[7:0] IOUT1 offset current negative offset for despeckle 22h offset0_des_msb Reserved iout0_off_desp[11:8] IOUT0 offset current negative offset for despeckle (MSB) 23h offset0_des_lsb iout0_off_desp[7:0] IOUT0 offset current negative offset for despeckle 24h alarm_th2 alarm_th2[7:0] Alarm threshold for IOUT2 (output DAC MSB) 25h alarm_th1 26h alarm_th0 alarm_th1[7:0] Alarm threshold for IOUT1 (output DAC MSB) alarm_th0[7:0] Alarm threshold for IOUT0 (output DAC MSB) 41 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. Rev V1 M08886 Registers Addr Register Name d7 27h reserved Reserved 28h despeckle_clk Reserved d6 d5 d4 d3 d2 d1 d0 despeckle_clk Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W When 0x02[2:0]=100b: 00 => 320 MHz (Laser mode =>despeckle) 01 => 94 MHz 10 => 160 MHz 11 => 43 MHz (LED mode => power saving) APC REGISTERS 29h 2Ah loop_ctrl target2_msb iturnon2 iturnon1 iturnon0 Initial IOUT2 DAC is set to: 1: 0 0: offset+gain current Initial IOUT1 DAC is set to: 1: 0 0: offset+gain current Initial IOUT0 DAC is set to: 1: 0 0: offset+gain current Reserved Reserved loop_clk apc2_freeze apc1_freeze apc0_freeze PWM and MPG clock 1: Use external clock input (CLK_IN) 0: use internal oscillator 1: freeze APC (both gain and offset) for IOUT2 0: normal operation 1: freeze APC (both gain and offset) for IOUT1 0: normal operation 1: freeze APC (both gain and offset) for IOUT0 0: normal operation target2[12:8] MSB target DAC for gain of IOUT2 2Bh target2_lsb 2Ch target2ith_msb target2[7:0] LSB target DAC for gain of IOUT2 Reserved target2_ith[12:8] MSB target DAC for offset of IOUT2 2Dh target2ith_lsb target2_ith[7:0] LSB target DAC for offset of IOUT2 2Eh target1_msb Reserved target1[12:8] MSB target DAC for gain of IOUT1 2Fh target1_lsb target1[7:0] LSB target DAC for gain of IOUT1 30h target1ith_msb Reserved target1_ith[12:8] MSB target DAC for offset of IOUT1 31h target1ith_lsb target1_ith[7:0] LSB target DAC for offset of IOUT1 32h target0_msb Reserved target0[12:8] MSB target DAC for gain of IOUT0 33h target0_lsb target0[7:0] LSB target DAC for gain of IOUT0 42 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. Rev V1 M08886 Registers Addr Register Name 34h target0ith_msb d7 d6 d5 Reserved d4 d3 d2 d1 d0 target0_ith[12:8] Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W MSB target DAC for offset of IOUT0 35h target0ith_lsb target0_ith[7:0] LSB target DAC for offset of IOUT0 36h 37h 38h apc2_ctrl2 apc2_ctrl1 apc2_ctrl0 Tck_init2[1:0] Tck_mid2[1:0] Tck_min2[1:0] Tck_div2[1:0] Initial clock count for IOUT2 00: 0 01: 63 10: 127 11: 255 Mid clock count for IOUT2 00: 0 01: 31 10: 63 11: 127 Clock counts for IOUT2 at min step 00: 0 01: 31 10: 63 11: 127 Clock counts to enable clock divider for IOUT2 00: 0 01: 63 10: 127 11: 255 Step_init2[1:0] Step_mid2[1:0] RSVD ck_div2[1:0] Initial step size in LSB of IOUT2 00: 1 01: 8 10: 16 11: 32 Mid step size in LSB of IOUT2 00: 1/2 of Step_init 01: 1/4 of Step_init 10: reserved 11: reserved Clock divider for IOUT2 00: 1 01: 4 10: 8 11: 16 Dec2[2:0] apc_offset line_mode2 apc2_ch RSVD Digital filter decimation factor for IOUT2: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 1: update IOUT2 offset during blanking following I2_ON 0: do not update and output 0 current during blanking Line mode for IOUT2 1: OUT2 on only during CLK_IN=H 0: Ignore CLK_IN Selects APC input for IOUT2 00: APC_IN0 01: APC_IN1 10: APC_IN2 11: disable APC 39h reserved Reserved 3Ah apc1_ctrl2 Tck_init1[1:0] Tck_mid1[1:0] Tck_min1[1:0] Tck_div1[1:0] Initial clock count for IOUT1 00: 0 01: 63 10: 127 11: 255 Mid clock count for IOUT1 00: 0 01: 31 10: 63 11: 127 Clock counts for IOUT1 at min step 00: 0 01: 31 10: 63 11: 127 Clock counts to enable clock divider for IOUT1 00: 0 01: 63 10: 127 11: 255 Step_init1[1:0] Step_mid1[1:0] Reserved ck_div1[1:0] Initial step size in LSB of IOUT1 00: 1 01: 8 10: 16 11: 32 Mid step size in LSB of IOUT1 00: 1/2 of Step_init 01: 1/4 of Step_init 10: reserved 11: reserved 3Bh apc1_ctrl1 Clock divider for IOUT1 00: 1 01: 4 10: 8 11: 16 43 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 3Ch apc1_ctrl0 d7 d6 d5 d4 d3 d2 d1 Dec1[2:0] apc_offset line_mode1 apc1_ch Digital filter decimation factor for IOUT1: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 1: update IOUT1 offset during blanking following I1_ON 0: do not update and output 0 current during blanking Line mode for IOUT1 1: OUT1 on only during CLK_IN=H 0: Ignore CLK_IN Selects APC input for IOUT1 00: APC_IN0 01: APC_IN1 10: APC_IN2 11: disable APC d0 Default Type Reserved 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000001 R/W 3Dh reserved Reserved 3Eh apc0_ctrl2 Tck_init0[1:0] Tck_mid0[1:0] Tck_min0[1:0] Tck_div0[1:0] Initial clock count for IOUT0 00: 0 01: 63 10: 127 11: 255 Mid clock count for IOUT0 00: 0 01: 31 10: 63 11: 127 Clock counts for IOUT0 at min step 00: 0 01: 31 10: 63 11: 127 Clock counts to enable clock divider for IOUT0 00: 0 01: 63 10: 127 11: 255 Step_init0[1:0] Step_mid0[1:0] Reserved ck_div0[1:0] Initial step size in LSB of IOUT0 00: 1 01: 8 10: 16 11: 32 Mid step size in LSB of IOUT0 00: 1/2 of Step_init 01: 1/4 of Step_init 10: reserved 11: reserved 3Fh 40h Rev V1 apc0_ctrl1 apc0_ctrl0 41h reserved 42h dec_off_ctrl Clock divider for IOUT0 00: 1 01: 4 10: 8 11: 16 Dec0[2:0] apc_offset line_mode0 apc0_ch Digital filter decimation factor for IOUT0: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 1: update IOUT0 offset during blanking following I0_ON 0: do not update and output 0 cirrent during blanking Line mode for IOUT0 1: OUT0 on only during CLK_IN=H 0: Ignore CLK_IN Selects APC input for IOUT0 00: APC_IN0 01: APC_IN1 10: APC_IN2 11: disable APC Reserved RSVD Reserved DecOff[2:0] Digital filter decimation factor for offset current: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 44 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 43h clk_div d7 d6 d5 d4 clk_div_pwm[3:0] 45h pwm_msb pwm2 Reserved d3 d2 d1 d0 clk_div_mpg[3:0] PWM clock divider 0000 = 1 0001 = 2 0010 = 4 0011 = 16 0100 = 256 0101 = 512 0110 = 1024 0111 = 2048 44h Rev V1 Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 01010101 R/W 00000101 R/W MPG clock divider 0000 = 1 0001 = 2 0010 = 4 0011 = 16 0100 = 256 0101 = 512 0110 = 1024 0111 = 2048 on_count2[9:8] on_count1[9:8] on_count0[9:8] PWM IOUT2 (msb) PWM IOUT1 (msb) PWM IOUT0 (msb) on_count2[7:0] PWM on count lsb for IOUT2 46h pwm1 on_count1[7:0] PWM on count lsb for IOUT1 47h pwm0 on_count0[7:0] PWM on count lsb for IOUT0 48h 49h mpg_off_msb mpg_off2 Reserved pulse_off2[9:8] pulse_off1[9:8] pulse_off0[9:8] MPG off IOUT2 (msb) MPG off IOUT1 (msb) MPG off IOUT0 (msb) pulse_off2[7:0] MPG pulse off lsb for IOUT2 4Ah mpg_off1 pulse_off1[7:0] MPG pulse off lsb for IOUT1 4Bh mpg_off0 pulse_off0[7:0] MPG pulse off lsb for IOUT0 4Ch 4Dh mpg_on_msb mpg_on2 Reserved pulse_on2[9:8] pulse_on1[9:8] pulse_on0[9:8] MPG on IOUT2 (msb) MPG on IOUT1 (msb) MPG on IOUT0 (msb) pulse_on2[7:0] MPG pulse on lsb for IOUT2 4Eh mpg_on1 pulse_on1[7:0] MPG pulse on lsb for IOUT1 4Fh mpg_on0 pulse_on0[7:0] 5Dh checksum Checksum MPG pulse on lsb for IOUT0 Checksum 5Fh DL_done Reserved dl_done 1010b: download done anything else: download not done 45 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. Addr Rev V1 M08886 Registers Register Name d7 d6 d5 d4 d3 d2 d1 d0 Default Type REGISTERS only accessible to an external uC 80h soft_reset Soft reset 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R/W 00000000 R/W Writing AA causes a reset (this register will clear after reset) All registers returned to default value 81h checksum_cal Checksum calculated Checksum of 96 bytes calculated by M08886 for debugging purposes 82h 83h chip_id temp Revision identification: Chip identification 0001 for -13 die 0110 temp[7:0] Temperature readback 84h 85h rb_iout2_msb rb_iout2_gain_lsb iout2_gain[11:8] iout2_offset[11:8] read back IOUT2 gain MSB read back IOUT2 offset MSB iout2_gain[7:0] read back IOUT2 gain LSB 86h rb_iout2_offset_lsb iout2_offset[7:0] read back IOUT2 offset LSB 87h rb_iout1_msb iout1_gain[11:8] iout1_offset[11:8] read back IOUT1 gain MSB read back IOUT1 offset MSB 88h rb_iout1_gain_lsb iout1_gain[7:0] read back IOUT1 gain LSB 89h rb_iout1_offset_lsb iout1_offset[7:0] read back IOUT1 offset LSB 8Ah 8Bh rb_iout0_msb rb_iout0_gain_lsb iout0_gain[11:8] iout0_offset[11:8] read back IOUT0 gain MSB read back IOUT0 offset MSB iout0_gain[7:0] read back IOUT0 gain LSB 8Ch rb_iout0_offset_lsb iout0_offset[7:0] read back IOUT0 offset LSB 8Dh 8Eh alarm_ctrl reserved alarm2 alarm1 alarm0 Alarm for IOUT2 Alarm for IOUT1 Alarm for IOUT0 Reserved Reserved 46 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Table 3-1. M08886 Registers Addr Register Name 90h strbalrm_ctrl d7 Reserved d6 d5 d4 d3 reg_spl_dis Reserved Disables register sampling: 1: Disable register sampling (cannot read/ write to any register except 90h) 0: Normal operation (all registers are accessible) 91h Rev V1 Reserved Reserved d2 d1 d0 Default Type strb_iout clear_alarm 00000000 R/W 1: strobes iout current before read0back 0: Normal 1: Clear alarm 0: Normal 00000000 R/W 47 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M08886-13 High Performance RGB LED/Laser Driver for LCD/LCoS/DLP Projection Displays Rev V1 M/A-COM Technology Solutions Inc. All rights reserved. Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM") products. These materials are provided by MACOM as a service to its customers and may be used for informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM assumes no responsibility for errors or omissions in these materials. MACOM may make changes to specifications and product descriptions at any time, without notice. MACOM makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS. MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM customers using or selling MACOM products for use in such applications do so at their own risk and agree to fully indemnify MACOM for any damages resulting from such improper use or sale. 48 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support