M08888G-11

M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 Features Applications • Three 2A common anode LED/laser drivers • DLP/LCD/LCoS Projector Systems • Integrated 12.5 Msps 10-bit current DACs with 6-bit programmable full scale • Backlight illumination • Real-time continuous and integrating optical power control • DC-DC control circuitry • Safety circuitry • High speed 4 wire interface or I2C The M08888 is a high efficiency integrated triple channel 2A LED/laser driver for LCD/LCoS/DLP projection displays. It features automatic optical power control for consistent white balance across temperature variation and light source aging. The M08888 allows for the control of an external DC-DC converter to generate optimal light sources supply and improve overall system efficiency. An internal junction temperature monitor is also available. The part can be programmed via I2C or high speed 4-wire SPI interface. M08888 Block Diagram Internal Temp Sensor M08888 PD 13bit Target DAC 4 wire serial and dual I 2C APC_IN0 Analog MUX APC_IN1 SO/ADDR1 __ CS/ADDR0 SI/SDA_S SCK/SCL_S Serial Interface Controller Current Comparator SerSel CPC VREF APC IPC Current scaling APC_IN2 Register table C I0_ON I1_ON I2_ON Timers 6bit Scale DAC 6bit Scale DAC ________ LP_MODE ______ ALARM CLK_IN 10bit DAC _____ ________ CLK_IN/ALARM/LP_MODE POR 10bit DAC 12.4kΩ 6bit Scale DAC References 10bit DAC Vref Internal oscillator Headroom control REGREF 2A Driver DC-DC Converter Control 2A Driver 2A Driver LED Alarm VLDD monitor IOUT0 IOUT1 R/G/B IOUT2 R/G/B 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 Ordering Information Part Number Package Operating Temperature M08888G-11 * 28 pin, 4.5 mm x 4.5 mm QFN -40 °C to +85 °C M08888-11EVM Evaluation board with M08888-11 -40 °C to +85 °C * The letter “G” designator in the part number indicates that the device is RoHS-compliant. Revision History Revision Level Date Description V4 Release July 2015 Updated register references. E (V3) Release September 2011 Updated Ordering Information D (V2) Release August 2011 C (V1) Release June 2011 Update Product Specifications, Functional Descriptions and Register Descriptions B (V1P) Preliminary October 2010 Update Product Specifications, Functional Description and Register Descriptions. Add operating specifications at Tc=120°C in Tables 1-5, 1-6 and 1-8. Change pin24 from DIS to GND. Swapped pinout of ADDR0 (pin 19) and ADDR1 (pin 18). A (V1A) Advance June 2010 Initial Conventions Throughout this document, pins will be identified with italics (example IOUT1) while x or X means 0,1,2 to indicate the different channels. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 1.0 Product Specification 1.1 Absolute Maximum Ratings 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 Voltage at pins DVDD and ALVDD 1.98 V DHVDD, AHVDD 3.3 V Digital and Analog Voltage at pins DVDD and ALVDD 3.63 V IOUT0, IOUT1, IOUT2 Output pins for driving LED/Laser - maximum voltage 5.5 V TJCTN Junction Temperature -40 to +125 °C TSTG Storage Temperature -65 to +150 °C SERSEL Serial data format select input -0.4 to 3.63 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 I0_ON, I1_ON, I2_ON Enable LED/Laser output -0.4 to 3.63 V CLK_IN, CS, SI, SCLK, SO SPI inputs and output -0.4 to 3.63 V SCLK_S, SDA_S I2C interface -0.4 to 3.63 V REGREF External DC-DC converter control signal -0.4 to DVDD +0.4 V I_REGREF Current into or out of REGREF -0.12 to +0.12 mA 3 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.2 Rev V4 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 1.8 V Supply Current Open Loop — 18.5 21.5 mA (DVDD and ALVDD)1, 2 Closed Loop (IPC) — 8.5 11 Closed Loop (CPC) — 22 30 Open Loop — 7.5 13 Closed Loop (IPC) additional to open loop current — — 0.05 Closed Loop (CPC) — 2.5 3.2 1.8 V SET Threshold For positive going supply — 1.5 — V 1.8 V RESET Threshold For negative going supply 3.3 V SET Threshold For positive going supply — V 3.3 V RESET Threshold For negative going supply Case Temp. Measured on top of M08888 case 85 °C 3.3 V (DHVDD and AHVDD) IHVDD Standby Current - 3.3 V LVPOR HVPOR Tc 1 mA 1.4 — 2.72 2.62 -40 — NOTES: 1. Excludes serial interface (SPI/I2C) current and LED current 2. ILVDD will be increase by 0.5% of the Ix_OUT current when Ix_OUT is active. For the specified values inputs are toggling at 1 kHz at 50% of maximum Ix_OUT current. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.3 Rev V4 APC Input Characteristics (register 4Ah[4]=1b) 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 1-3. APC Input Characteristics (photodiode cathode connected to pin APC_INX and photodiode anode connected to ground) Parameter Conditions Minimum Typical Maximum Units Full scale input APC_IN0,1,2 3.1 3.25 3.4 mA PD capacitance1 APC_IN0,1,2 — — 80 pF Input bias APC_IN0,1,2 — 1.8 — V — — 1.89 V Maximum input voltage 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 1.4 APC Input Characteristics (register 4Ah[4]=0b) 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 1-4. APC Input Characteristics (Current Sink Input) Parameter Minimum Typical Maximum Units APC_IN0,1,22 3.1 3.25 3.4 mA PD capacitance APC_IN0,1,2 2 — — 300 pF Min Input bias APC_IN0,1,22 — 0.6 — — Full scale input 1 Conditions Maximum input voltage V 1.89 NOTES: 1. Care should be taken in routing of each PD input so that total capacitance on the pin including routing does not exceed 300 pF 2. Only a single channel can be used (broadband monitor photodetector). If multiple channel are used accuracy is not guaranteed. 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 V M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.5 Rev V4 CPC Target DAC 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 1-5. CPC Target DAC Parameter Minimum Typical Maximum Units Resolution — 13 — bits Conversion rate — 30 — Msps — 3.25 3.4 mA Step size — 350 515 nA CPC Control Loop Accuracy1 -6 — 6 % Full scale photodetector current Conditions monitor NOTES: 1. At Tc= 120 °C control loop accuracy is +/-7% 1.6 Integrating Power Control 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. Integrating Power Control Parameter Conditions Resolution Minimum Typical Maximum Units — 10 — bits +35 % +11 % Count variation Part to part -35 Stability2 For targets > 200 µA and register 0x0B=50h -11 — NOTES: 1. This will correspond to a total power (LED/MPD current?) variation: monotonicity will still be guaranteed by the architecture 2. Variation of integration target over supply and temperature. At Tc= 120 °C accuracy is +/-14% 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.7 Rev V4 LED 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 1-7. LED Drivers Parameter Headroom required1 Conditions At 2A full scale Maximum allowable voltage headroom2 Rise/fall time3 20-80% Into 1 Ω electrical output, no snubber network Minimum Typical Maximum Units — — 0.3 V — — 5.5 V — — 200 ns NOTES: 1. Required headroom scales with output current, maximum output current requires maximum headroom (see Section 2.3). 2. To prevent damage at output pins do not exceed this voltage. Also verify power sequencing and power dissipation. 3. Guaranteed by design Table 1-8. Output Current DACs Parameter Conditions Minimum Typical Maximum Units Resolution — 10 — bits Conversion rate — 12.5 — Msps Full scale IOUTX Referred to the current output — 2 — A IOUTX absolute accuracy Referred to the current output1 -8 — 8 % Minimum Typical Maximum Units — 6 — bits NOTES: 1. For driver headroom > specified in Table 1-7. Measured at 1000 mA. At Tc= 120 °C accuracy is -8% to +10% Table 1-9. Scale DACs Parameter Conditions Resolution Minimum scale value Referred to the current output, equivalent to code 000000b 180 200 220 mA Maximum scale value Referred to the current output, equivalent to code 111111b 1.775 2 2.2 A Scale step Referred to the current output 25 28.6 31 mA 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.8 Rev V4 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, ALVDD=1.8 V, AHVDD =3.3 V Table 1-10. DC-DC Converters Reference Generators Parameter Conditions Minimum Typical Maximum Units Voltage compliance 0.5 1.2 1.3 V V DAC resolution — 9 — bits DAC DNL -1.3 — 1.3 LSB DAC full scale (regref_setup[1]=0b) — 100 110 µA DAC full scale (regref_setup[1]=1b) — 200 220 µA -20 — +20 mV Minimum Typical Maximum Units Range — -40 to 125 — °C Temperature step — 0.65 — °C Absolute accuracy1 -10 — +10 °C DC-DC Converter Headroom Configured as per Table 2-4 using a Texas Instruments TPS63020 Error DC-DC converter and decimation set to 64. 1.9 Internal Temperature Sensor Typical values: Tc=-40 °C to 100 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-11. Internal Temperature Sensor Parameter Conditions NOTES: 1. After system calibration at room temperature (one point calibration). 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.10 Rev V4 Light Sources Alarm 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 1-12. Light Sources Alarm Parameter Conditions Minimum Typical Maximum Units Light sensor alarm thresholds1 50 — 200 mV Threshold accuracy — +/-15 — mV Alarm response time — 5 — µs NOTES: 1. Threshold can be programmed through register alarm_setup0/1 to 50 mV, 100 mV, 150 mV, 200 mV. 1.11 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, ALVDD=1.8 V, AHVDD = +3.3 V Table 1-13. CMOS Pins Characteristics Parameter Minimum Typical Maximum Units VIH1 0.65 DVDD — 3.63 V VIL 0 — 0.35 DVDD V VOH DVDD-0.4 — DVDD V V0L 0 — 0.4 V — 3 — ns Rise/fall time2 Conditions Maximum load of 5 pF. SPI mode NOTES: 1. Digital pins are 3.3 V (+/-10%) tolerant 2. In I2C mode, rise/fall time depends on load and pull up resistor. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 Slave I2C Timing Specifications1,2 1.12 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 1-14. Slave I2C Timing Specifications1,2 Parameter Symbol (refer to figure below) Minimum Typical Maximum Units Clock Frequency, SCL_M fSCL_MASTER — — 3.4 MHz 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 Outputs (SDA_M, SCL_M, SDA_S and SCL_S) RPULL-UP internal pull-up resistor value 3 — 250 — kΩ Stop Set-up Time tSUSTO 160 — — ns Data Out Hold Time tDH 5 — — ns NOTES: 1. Guaranteed by design and characterization. 2. Specified at recommended operating conditions. 3. 4.7 kΩ should be added externally. Figure 1-1. Slave I2C Timing 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.13 Rev V4 High Speed Serial Interface Timing Specifications 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: Ta=25 °C, DVDD, ALVDD=1.8 V, AHVDD =3.3 V Table 1-15. High speed serial interface timing specifications Parameter Symbol (refer to figure below) Minimum Typical Maximum Units Clock Frequency fclk=1/Tclk — — 3.4 MHz Data in to clk hold time Tdh 160 — — ns Data in to clk set-up time Tds 60 — — ns Enable to clk set up time Tcs 0 — 70 ns Enable to clk hold time Tch 160 — — ns Read data output valid Tdd following rising edge of SCLK 160 — — ns SCLK duty cycle 45 — 55 % NOTES: 1. Maximum output capacitance of 30 pF. Figure 1-2. 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 address (A7 ...A0) 1st Data (D7 ...D0) 2nd data( D7...D0) 3rd data SO 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Figure 1-3. Rev V4 Serial Interface Random Write 1 2 3 9 10 11 12 13 14 15 16 17 18 19 20 SCLK Tch Tcs Tcs xCS Tdh SI 1 0 address (A7 ...A0) Data (D7 ...D0) SO Figure 1-4. 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 address SO Figure 1-5. 2nd 8-bits MISO 1st 8-bits MISO 3rd 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 address Tdd SO D7 Tdd D0 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.14 Rev V4 M08888 Pinout The M08888 is packaged in a 4.5 x 4.5 mm 28-pin QFN package with 0.5 mm pin pitch. 22 28 AHVDD DHVDD ______ _________ CLK/ALARM/LP_MODE DIS REGREF IOUT2 IOUT2 M08888 Pinout IOUT2 Figure 1-6. 1 21 SCLK/SCL_S SI/SDA_S IOUT1 IOUT1 SO/ADDR0 IOUT1 ___ CS/ADDR1 IOUT0 IOUT0 I1_ON 15 7 ALVDD VREF APC_IN0 APC_IN1 14 APC_IN2 SERSEL 8 I2_ON DVDD IOUT0 I0_ON GND, connect to PCB ground with an array of > 9 vias. 4.5 mm x 4.5 mm 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 1-16. Rev V4 Pin List and Descriptions Pins Name Type Function 1 AHVDD Supply 3.3 V analog supply 2, 3, 4 IOUT1 Analog Channel 1 output 5, 6, 7 IOUT0 Analog Channel 0 output 8 SerSEL CMOS (w/ pulldown) 9, 10, 11 APC_IN Analog Monitor PD inputs (assignable) 12 VREF Analog Current reference generator 13 ALVDD Supply 1.8 V analog supply 14 DVDD Supply 1.8 V digital supply 15 I2_ON CMOS (w/ pulldown) Turns on driver 2 16 I1_ON CMOS (w/ pulldown) Turns on driver 1 17 I0_ON CMOS (w/ pulldown) Turns on driver 0 18 CS/ADDR0 Open Drain (w/ pull-up) Serial enable/I2C address0 19 SO/ADDR1 Open Drain (w/ pull-up) Serial data out/I2C address1 20 SI/SDA_S Open Drain (w/ pull-up) Serial data in/I2C data slave 21 SCLK/SCL_S Open Drain (w/ pull-up) Serial clock/I2C clock slave 22 DHVDD Supply 23 CLK_IN/ALARM/LP_MODE CMOS (w/ pulldown) 24 DIS CMOS Disable Pin 25 REGREF Analog DC-DC converter control voltage 26, 27, 28 IOUT2 Analog Channel 2 output GND Supply Ground Serial interface select (L=I2C,H=SPI) 3.3 V digital supply CLK_IN pin or ALARM or LP_MODE pin NOTES: PD means pulled down, PU means pulled up. 4.7 µF + 100nF should be used on each of the M08888 supply. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 1.15 Figure 1-7. Rev V4 Package Information Package Information 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 2.0 Functional Description The M08888 is a highly integrated LED/laser driver for LCD/LCoS/DLP projection display applications. It provides control and monitoring of up to three LEDs/lasers, a temperature sensor and control of external DC-DC converters for optimal laser/led supply voltage. Each Laser/LED output consists of a 10 bit DAC which controls a high efficiency driver. If the desired maximum current is less than 2A the output resolution can by improved by a 6 bit independent scaling DAC. The output stages require only 300 mV of headroom between the M08888 output and the Laser/LED cathode when driving 2 amperes. The headroom requirement can be scaled proportionally lower for lower currents. The M08888 also incorporates safety and alarm features and a temperature monitor with 8 bit resolution. The M08888 internal registers are loaded from an external micro controller through a slave I2C interface or a 4-wire high speed interface. The host micro controller can monitor the temperature sensor and read back the analog to digital converter outputs and status registers using either serial interface. 2.1 Operating Modes The M08888 can operate in 3 different optical power control modes. The power control modes are open loop (OL) and 2 automatic power control (APC) modes: continuous power control (CPC) and integrating power control (IPC). Different output channels can have different operating modes. Some channels may be configured as Open Loop and some channels may be configured to use APC (either CPC or IPC). Open Loop mode is the simplest mode of operation and the Laser/LED current is set by writing the desired current to the output DAC. The 2 automatic power control modes (APC) use monitor photodiode feedback to accurately adjust the Laser/LED output power to make the current from a photodiode match a target current. With APC control temperature compensation of the Laser/LED is automatic and color balance is simplified. The user can select the polarity of the monitor photodetector if an APC mode is selected. By default the M08888 accepts a current source monitor photodetector (MPD) tied to the positive supply. It is possible to accept current sink MPD by selecting ipc_setup[4]=1b. Configuration of the M08888 timer settings and pin 23 configuration will also affect optical power control. 2.1.1 Open Loop Output Control In open loop mode the current for each Laser/LED is stored in register (ioutx[9:0]). The M08888 will shift the contents of ioutx[9:0] and ioutx_scale[5:0] registers to the output DAC when pin Ix_ON goes high and the output will then sink the programmed current through the Laser/LED. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 By changing the scale setting ioutx_scale the full 10 bits of settability can be retained even for low Laser/LED currents. The scale can be changed on a frame by frame basis but when ioutx_scale is changed the rise time of the output stage will be significantly slower during the first Ix_ON period in which the change in the scale is made. The rise time will return to its normal value in subsequent Ix_ON periods if the scale is not changed. The M08888 includes timers that can be used to delay, pulse width modulate or clock the Open Loop output signal. See Section 2.4 for a description of how to use these features. When pin 23 operates in LP_MODE (input_ctrl[6:5]=10b) the scale value of each channel can be different for the different pin 23 states. These scales are set in ioutx_scale[5:0] (pin 23=H) and ioutx_scale_LP[5:0] (pin 23=L). Table 2-1. Name Basic Register Configuration for Open Loop Control (when REGREF is not controlling a DCDC Converter) Address Recommend Setting Description out_ctrlx 0x05[7],0x06[7], 0x07[7] 1b Set outputs to Open Loop Control if Regref is not used to control a DC-DC converter at this output. pd_fe 0x0A[0] 1b Power down photodiode amplifier (if all channels are under open loop control) ioutx_msb 0x10[1:0], 0x14[1:0], 0x18[1:0] xxb Two most significant bits of output current setting ioutx_lsb 0x11, 0x15,0x19 xxh Eight least significant bits of output current setting ioutx_scale 0x12, 0x16, 0x1A 11xxxxxb Set the scaling of the output currents ioutx_scale_lp 0x13, 0x17, 0x1B 11xxxxxb Set the scaling of the output currents in Low Power mode apc0_ch 0x34[1:0] 11b Disable APC input for selected channel apc1_ch 0x34[3:2] apc2_ch 0x34[5:4] 2.1.2 Automatic Power Control 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 apc_ctrl0[5:0]=11. For channels with disabled APC the laser/led currents are controlled through the serial interface using bits ioutx[9:0]. It is possible to freeze the APC loop for each channel by using apcx_freeze[0]. In this case the M08888 will stop updating the IOUTx currents independently of the state of Ix_ON pins.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. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 The target values are stored in registers target2[12:0], target1[12:0] and target0[12:0] respectively for IOUT2, IOUT1 and IOUT0 before the corresponding color is turned on by the transition of I2_ON, I1_ON or I0_ON from low to high. This allows for the control of the LED/laser power in real time on a frame by frame basis. When one of the Ix_ON signals is enabled (low to high transition), the target DAC value for that input is activated and the incoming monitor photodetector current is selected by the analog multiplexer from APC_IN0, APC_IN1 or APC_IN2. The monitor photodetector input is assigned to an output using apc_ctrl[5:0]. Each Laser/LED can have its own photodetector or all the Lasers/LEDs can share a single broadband photodetector. For example, if a single broadband photodetector is used and connected to APC_IN0 all the apc_ctrl0[5:0] should be set to 00b. It should be noted that the index in the APC registers does not refer to the input channel but to the Laser/LED output channel. If the monitor photodetector feedback for IOUT2 is tied to APC_IN0 then apc_ctrl[5:4]=00 and the settings for the monitor photodetector should be programmed in the APC registers with index 2. If more then one laser is turned on (2 or 3 of I0_ON, I1_ON or I2_ON are high at the same time) the M08888 freezes the update of the APC loop for as long as more then one of the Ix_ON signals are high. This prevents the APC loop from using incorrect photodetector information in case a single photodetector is used. In the case of multiple Ix_ON simultaneously the optical power tracked and adjusted is that of the channel corresponding to the lastIx_ON transitioning high. It should be noted that 2 or more low to high transitions of any of the I0_ON, I1_ON or I2_ON within 500 ns of each other would violate internal timing and will result in unpredictable operation. Care should be taken to prevent damage to the part when multiple lasers are enabled. The power dissipation of the M08888 should be kept below the level that, when multiplied by the thermal resistance of the package in the system and added to the maximum ambient temperature, does not exceed 125 °C. The maximum photodiode current supported by the M08888 is 3.25 mA. The full scale value of the target DAC is 3.25 mA with a resolution of 13 bits (390 nA step size). As an example, if the maximum current from the photodiode is 200 µA then the possible target values are up to 512 decimal (200 µA/390 nA). In this example the maximum target value for targetx[12:0] would be 200h. Readback of the output current DAC of each channel is possible by strobing the DACs using strbalarm_ctrl[1] and reading registers rb_ioutx[9:0] When pin 23 is set to LP_MODE (input_ctrl[6:5]=10b) the target power value will be controlled by the state of pin 23. When pin 23 is high the Laser/LED current will be adjusted until the monitor photodiode current matches the target in register targetx[12:0] and when pin 23 is low the Laser/LED current will be adjusted until the monitor photodiode current matches the target in register targetx _LP[12:0]. The M08888 is capable of accepting also current sink type monitor photodetector typical of LCOS panels. This can be done by setting register ipc_setup[4]=1b. When sink MPD is selected the mirror ratio can be selected between 1:1 and 4:1 by setting bit ipc_setup[5]. The MPD can have a maximum capacitance of up to 300 pF however in this case the M08888 will operate only with a single broadband photodetector. 2.1.2.1 Continuous Power Control In continuous power control (CPC) mode, the M08888 continuously compares the monitor photodetector current to a target value and makes monitor photodiode current match the target value by adjusting the current in the laser/ LED. For example, if the monitor photodetector current is below the target then the Laser/LED current is increased. The sign of this operation can be inverted using input_ctrl[4] (but it should not be changed unless it is certain that there is an inversion in the monitor photodiode signal). 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 The CPC loop is designed to settle to the desired output power in less than 50 µs. To achieve optimal settling time, the CPC loop must be adjusted to the laser/monitor photodetector characteristics. This is done using the settings in apcx_ctrl0, apcx_ctrl1 and apcx_ctrl2. To further reduce the settling time the user can program the initial current from which the CPC loop will start. This can be 0, the value programmed in ioutx[9:0] register or the value to which the CPC had converged during the previous frame. The selection of the initial current is done using register iturnonx[1:0] (apcx_ctrl1[3:2]). Starting from the previously determined value will substantially accelerate settling time since it is likely that it will be starting at the proper level. It is possible to “freeze” the APC loop for each channel by using apcx_ctrl0[0]. When apcx_ctrl0[0]=1b the M08888 will stop updating the IOUTx currents irregardless of the state of Ix_ON pins. It is possible also to delay operation the CPC loop immediately following the light source turn-on. This will allow the DC-DC converter to settle to the proper voltage before the APC starts adjusting the current. The CPC delay time can be programmed using register apcx_ctrl0[2:1]. Table 2-2. Basic Register Configuration for CPC Control Recommend Setting Name Address out_ctrlx 0x05[7],0x06[7], 0x07[7] 1b Set output to Closed Loop Control loop select 0x34[6] 1b Select CPC loop control apc0_ch 0x34[1:0] apc1_ch 0x34[3:2] xxb apc2_ch 0x34[5:4] 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. targetx_msb 0x35, 0x37, 0x39 000x xxxxb targetx_lsb 0x36, 0x38, 0x3A xxh apc0_ctrl2 0x47 xxh apc1_ctrl2 0x44 Set the length in clock counts of the initial, mid and min step intervals. Set the delay for the clock divider. The decimation factor and clock divider will also affect interval lengths. apc2_ctrl2 0x41 apc0_ctrl1 0x48 xxh apc1_ctrl1 0x45 apc2_ctrl1 0x42 Set the step size of the change in LED drive current for the initial and mid intervals. Set the initial LED current to be 0 mA, the ending value of the previous I_on period or the value set in ioutx register. Set the clock divider. apc0_ctrl0 0x49 xxx00xx0b apc1_ctrl0 0x46 apc2_ctrl0 0x43 Set the decimation factor (mid and min count changes will occur at rate divided by the decimation factor). Set the WAIT states (APC will not change LED current during WAIT states). 2.1.2.2 Description Set the target at desired level. The LED drive current will be adjusted up or down until the photodiode current is equal to the target current for the channels that are controlled by CPC. Integral Power Control Integral power control (IPC) can be enabled by setting registers apc_ctrl[6]=0b. The working principle of integral power control is to mimic the behavior of the human eye which integrates the optical power over the frame period. This is achieved in the M08888 by charging a capacitor with the monitor photodetector current. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 When Ix_ON goes high the M08888 will drive the Laser/LED with a current defined by register ioutx[9:0]. The monitor photodiode current will charge an internal capacitor until its voltage matches an internal reference voltage (~0.8 V) at which time a counter is incremented and the capacitor is discharged. The monitor photodiode current continues to charge the capacitor and increment the counter until the count matches the target set by the user in registers targetx[9:0]. Once the counter reaches the value set by the user the M08888 stops driving the Laser/LED. By adjusting the count higher or lower the brightness of a frame can be adjusted. The target counter has 10bits and the M08888 can distinguish between 1024 different power levels. The target registers are the same of the CPC target registers but the resolution in IPC mode is limited to 10 bits instead of 13 bits. In order to maximize the dynamic range and be able to utilize the entire 10bits the user must select the proper mirroring ratios for the monitor photodetector current (ipdx_sel[4:0]), the charging current (ichx_sel[4:0]) and the value of the capacitance (capx_sel[3:0]). The settings of these bits will depend on the frame (or subframe) duration and on the monitor photodetector current. If it is desired to typically have the LED on for 1/2 the frame time then the registers should be configured such that: 1/2 x FR/512 = 0.8 V x Cch / Ich where FR is the frame or subframe rate, Cch is the charging capacitors selected through capx_sel[3:0], and Ich is the resulting charging current obtained by multiplying the monitor photodetector current by the ipdx_sel[4:0] and by the ichx_sel[4:0] mirroring ratios. The factor of 512 is length of the 10 bit range. Cch = 25 pF + N x 2.5 pF where N is the setting of capx_sel[3:0]. Ich = (IMPD / ipdx_sel[4:0]) x ichx_sel[4:0] where IMPD is the monitor photodiode current Example: Assume that the monitor photodiode current is 150 µA when the LED is on at the desired amplitude, the Ix_ON time is 1 ms and it is desired that the LED be on approximately 50% of this time. The mirroring ratio should be set to the 200 µA range ichx_sel[4:0] = 00001b, choose a Cch = 25 pF with ichx_sel[4:0] = 00000b (any other value is also OK but using the default value means this register never needs to be written), choose a mirroring ratio such that the Cch can be charged to 0.8 V several hundred times in 0.5 ms. (if it is desired that it be charged ~250 times in 0.5 ms then: 0.5 ms/250 =0.8 V x 25 pF /((150 µA / 200 µA) x ichx_sel[4:0]) 0.002 ms = 26.67e-12 / ichx_sel[4:0] ichx_sel[4:0] = 2.667e-5 / 2 which is between 10 µA and 20 µA so set ichx_sel[4:0] =00001b As in CPC mode, when pin23 operates in LP_MODE (input_ctrl[6:5]=10b) the target power value can be changed by toggling pin23. When pin 23 is high the Laser/LED current will be on until the monitor photodiode count matches the target in register targetx[9:0] and when pin 23 is low the Laser/LED current will be on until the monitor photodiode count matches the targetx _LP[9:0]. The monitor photodiode input can be changed from sinking to sourcing at ipc_setup[4] and an additional scaling factor of 4:1 is available at ipc_setup[5]. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 2-3. Rev V4 Basic Register Configuration for IPC Control Name Address Recommend Setting ipc_setup[4] 0x4Ah[4] 0b or 1b out_ctrlx 0x05[7],0x06[7], 0x07[7] 1b Set output to Closed Loop Control loop select 0x34[6] 0b Select IPC loop control apc0_ch 0x34[1:0] apc1_ch 0x34[3:2] xxb apc2_ch 0x34[5:4] 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. targetx_msb 0x35, 0x37, 0x39 000xxxxxb targetx_lsb 0x36, 0x38, 0x3A xxh ioutx_msb 0x10[1:0], 0x14[1:0], 0x18[1:0] xxb Two most significant bits of output current setting ioutx_lsb 0x11, 0x15,0x19 xxh Eight least significant bits of output current setting ioutx_scale 0x12, 0x16, 0x1A 11xxxxxb ipdx_sel 0x4C[4:0] 0x4F[4:0] 0x52[4:0] x xxxxb Select a setting that is greater than the peak current expected from the monitor photodiode. Choosing a lower amplitude setting will give more resolution/accuracy in setting the IPC target. ichx_sel 0x4D[4:0] 0x50[4:0] 0x53[4:0] x xxxxb Select a current range that can charge the IPC capacitor several hundred (but 10 µs) when Ix_ON=L (blanking period), opmode_ctrl1[7] should be set to 1. In this case during the blanking period the DAC current is set to 0 and all the IOUTx signals are disconnected so that an external resistor divider network can be used to set the light sources anode voltage. The impedance level at REGREF pin, defined by R1//R2//input impedance of the DC-DC converter, should always be greater then 500 kΩ. 2.4 Timers The M08888 features internal timers which allow an extra layer of control of the current by means of pulse width modulation (PWM) and multi pulse generation (MPG). The clock source for the internal timer circuitry can be either the internal 25 MHz oscillator or an external clock fed through CLK_IN (pin 23). With reference to the following diagram for channel 0 (I0_ON, IOUT0), PWM controls the “On delay time” while MPG adjusts independently both the “Pulse on time” and “Pulse off time”. Figure 2-1. Example of PWM and MPG Timers I0 _O N M ulti pulse gen ration (M P G ) P u lse w id th m od ula tio n (P W M ) IO U T 0 O n delay tim e P ulse on tim e P ulse o ff tim e C olor fram e/subfram e tim e 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 2.4.1 Rev V4 Pulse Width Modulation (PWM) Activating pulse width modulation will allow the output current to be delayed with respect to the Ix_ON signal. This may be useful if a blanking period is needed to allow the LCD or DLP to settle or it may be useful to save power if a laser is used and the same optical output can be achieved with fewer coulombs if higher laser driver currents and shorter durations are used (the coulombs will be less with higher current and shorter duration if the laser threshold current is approximately the same with PWM activated at higher current as it is at lower current without PWM activated). PWM works in all optical power control modes: Open Loop, CPC and IPC. The PWM delay is implemented with a 10 bit counter that counts the clock cycles of an internal 25 MHz oscillator. At the rising edge of each Ix_ON the counter is decremented and the Laser/LED is turned on when the counter reaches 0. The laser is turned off as usual on the falling edge of the corresponding Ix_ON signal. The maximum delay achievable is ~41 µs (1023 times the 40 ns period of the internal oscillator). Additional delay can be achieved by using the M08888 programmable divider of the internal clock. The internal clock can be divided down by a factor of 1, 2, 4, 8, 16, 32, 64, and 128. This can be obtained by writing register clk_div_pwm[3:0]. The maximum delay is therefore equal to ~5.24msec. The values of the programmable counter are stored in register on_countx[9:0]. The rising edge of the Ix_ON signal strobes the corresponding on_countx[9:0] value into the M08888 in the same fashion as other output current settings such as registers targetx[12:0] and ioutx[9:0] registers. 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 Ix_ON cycle. If the on_countx is programmed to 000h the PWM feature is disabled for IOUTx. The internal ring oscillator clock will vary by as much as +/-15% over process, temperature and supply. If this accuracy is not acceptable then pin 23 can be defined to be a clock input and a more accurate external clock signal can be used. The PWM block is designed to operate with a maximum frequency of 25 MHz. The PWM generator will work at the speed of the signal at CLK_IN (pin 23) when the external clock is selected with register clk_ctrl[2:1]. 2.4.2 Figure 2-2. Multi Pulse Generator (MPG) Multi Pulse Generator Timing I0_ON IOUT0 On delay time Pulse on time Pulse off time 30% frame time A less than 100% duty cycle pulsed waveform can be programmed into the M08888 using the Multi-Pulse Generator (MPG). 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 The multi-pulse generator (MPG) operates in a similar manner of the PWM generator. For each of the Lasers/LED outputs, two 10bit counters specify the number of 25 MHz internal clock cycles during which the output is on and off. As with the PWM timer, the MPG timer can be controlled by an external clock signal at CLK_IN (pin 23). The duty cycle of the pulsed waveform is resolved in 25 MHz clock periods or 40 ns steps. If both counters are loaded with the maximum value (1023) the waveform driving the output will be a clock of period ~81 µs. The clock can be divided down to lower rates by programming register clk_div_mpg[3:0]. MPG works in all optical power control modes: Open Loop, CPC and IPC. However if IPC or CPC power control is employed, the minimum divider ratio at register clk_div_mpg[3:0] is 8. Care should be taken when MPG is used while controlling the DC-DC converter as the slow response time of the DC-DC converter to variation in the light source drop may create oscillation and instability. It is recommended that register opmode_ctrl0[5]=1 if analog control mode is used to control the DC-DC converter. In this setting the DC-DC converter feedback will not be driven while the LED current is off (pulse off time). To prevent the DC-DC converter from drifting away from the optimal headroom operating point external resistive feedback R1/R2 should be added as shown in figure 1-2. The effective resistance of R1/R2 should be 500 kΩ. Because a 10 bit counter is used, 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 accuracy is inversely proportional to the maximum counter value. The control for the IOUTx output on pulse is programmed in register pulse_onx[9:0]. The off pulse is programmed in pulse_offx[9:0]. The rising edge of the Ix_ON signals strobe the corresponding pulse_on/offx[9:0] values into the M08888 timing controller. If the pulse_on/pulse_off register values are changed during the on time for that output the MPG setting will not be changed until the next Ix_ON cycle. If either the pulse_on or pulse_off for a channel is programmed to 000h then the MPG function is disabled for that channel. 2.5 Temperature Sensor The M08888 features an internal temperature sensor which measures the internal junction temperature of the part. The information is converted by the ADC and can be read through the serial interface at temp[7:0] register. The ambient temperature of the system can be calculated from the part junction temperature, the part power dissipation and the package thermal resistance (temperature measurements can vary dramatically at different locations within a system and measurements are dependent on mechanical factors such as PCB area, material and number of layers, airflow, heatsinking, etc.) Absolute accuracy of the temperature sensor is +/-10 °C after calibration at room temperature. Its resolution is 8-bit or 0.65 °C over the range of -40 °C to 125 °C. 2.6 26 Safety Using this driver for LEDs or Lasers in the manner described in this data sheet does not ensure that the resulting optical emissions comply with established standards such as IEC825. Designers must take the necessary precautions to ensure that eye safety and other applicable standards are met. Note that determining and 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 implementing the level of fault tolerance required by the applications that this part is going into is the responsibility of the projector designer and manufacturer since the application of this device cannot be controlled by MACOM. A register alarm is available: the safety monitor block compares the output current of each Laser/LED with 3 thresholds (one for each of the lasers/LEDs) and an alarm is issued if the current is higher then the programmed thresholds. The digital thresholds can be programmed in the following registers: alarm_thx[7:0], these represent the MSB of the output current. The alarm can be routed to the CLK_IN (pin 23) by setting input_ctrl[6:5]=00b. This signal can be used externally to shut down power to the lasers/LEDs or it can be read back from register alarm_ctrl[7:2] by the micro controller. It should be noticed that the alarm_ctrl[7:2] register is not self clearing: once an alarm has occurred, it must be cleared by the user by writing 1 to clear_alarm (strbalrm_ctrl[0]). The M08888 can also be programmed (opmode_ctrl1[3]) for automatic shutdown if the programmed threshold is exceeded. In this case the output current for that output is automatically forced to 0 by forcing 0 to the DAC inputs. This feature can be disabled via registers. When configured as ALARM pin 23 is an open collector and can operate in status mode and interrupt mode. This can be selected through opmode_ctrl0[3]. In status mode the alarm is provided directly to the pin. It should be noticed that in status mode the alarm may be issued only for the duration of one clock cycle of the internal high speed clock. Because of the high speed of the digital engine (12.5 MHz clock) a load which acts as a low pass filter will prevent this signal from being recognized by external circuitry. Excess capacitance and high impedances may act as low pass filters. In interrupt mode the M08888 will issue a positive going pulse on the alarm pin every time the internal alarm changes state. The width of the generated pulse can be programmed at opmode_ctrl0[2:0]. The output stage can also be disabled by the user via register, through bits opmode_ctrl1[1]. 2.7 Alarm The M08888 is capable of detecting an open or a short at the driver outputs and it will issue an alarm if a voltage lower then the programmed threshold is detected at the IOUTx outputs while the Laser/LED is not driven. Similarly, while the Laser/LED is driven, an alarm is issued if the voltage at IOUTx decreases below a preprogrammed threshold. This would indicate an open LED as the driver will force the IOUTx voltage to 0 if no LED is connected. The LED alarms can be enabled and programmed independently for each channel using registers alarm_setup0[7:0] and alarm_setup1[3:0]. If pin23 is configured as ALARM the alarm is issued at that pin but the alarm can also be read back at alarm_iout[2:0]. Alarm _iout[2:0] is not self clearing. To prevent false alarms caused by slow DC-DC converter settling the alarm signal can be delayed using alarm_set1[5:4]. 2.8 Programmable Serial Interface The M08888 will not begin operation until the internal registers of the M08888 are loaded and the start bit is set (0x61[0]=1b). It is not necessary to load values into a register if its default value is acceptable. 27 The M08888 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. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 When the part is configured to use I2C, an external host µController can access the register and read-back ADC from the slave I2C (SDA_S/SCL_S). The maximum SCL_S supported is 400 kHz. The slave address of the part can be programmed using ADDR0/1 pin. The address of the M08888 will be set to 98h, 9Ah, 9Ch or 9Eh when writing from the M08888 and 99h, 9Bh, 9Dh or 9Fh when reading to the M08888 when ADDR0/1 pin configured respectively to 00b, 01b, 10b or 11b. 4.7 kΩ pull up resistors should be used. The 4 wire high speed interface (SCLC/SI/SO/CS) supports up to 40 MHz serial clock speeds. 2.9 Power Sequencing To obtain reliable operation from the M08888 the power-up and power-down sequencing described in the diagrams below must be followed. Figure 2-3. Power-Up DVDD, ALVDD, AHVDD >10μsec 0V Red, green and blue laser supply 0V Figure 2-4. Power-Down DVDD, ALVDD, AHVDD >1μsec 0V Red, green and blue light supply 0V 28 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors 2.10 Rev V4 Driving a String of LEDs from a High Voltage Supply An M08888 can be used to drive a string of LEDs as shown in Figure 2-5 below. The M08888 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. Figure 2-5. Driving a String of LEDs from a High Voltage Supply High Voltage String of LEDs +3.3V N-Channel, low Rds, high Vbr M08888 IOUTX 2.11 Layout Considerations The center pad of the package is the electrical ground and the heat sinking path for the M08888. 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 M08888 and the via to ground from the resistor should be nearby. 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 The external DC-DC converter will amplify any noise on the REGREF pin. Care should be taken in routing this pin so it is not parallel to the laser/LED drive signals or clock signals. Decoupling capacitors should be on the same side of the PCB as the M08888 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). 30 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 3.0 Registers Table 3-1. Addr M08888 Registers Register name d7 d6 d5 d4 d3 d2 d1 d0 Default Type 01000000 R/W 00000000 R/W General REGISTERS 00h opmode_ctrl0 parallel 1. Enable parallel mode of operation 0: Normal mode of operation pd_target regref_ DAC mpg Powers down target DAC: 1: powers down target DAC 1: disconnect regref control during mpg (Open loop control) 0: normal operation (APC Conrol) 01h opmode_ctrl1 regref_ regref_edge selfcal_hr alrm_ctrl 1: enable self- Controls the behavior of the Alarm cal of output headroom for 1xxx: Status mode all channels 0000: Interrupt mode with 1 cycle pulse width (Recommended (1cycle=20 ns) for control of 0. do not 0001: Interrupt mode with 2 cycle pulse width external DC-DC converter) disconnect 0010: Interrupt mode with 4 cycle pulse width refreg …. during mpg 0: disable self 0111: Interrupt mode with 128 cycle pulse width calibration event seq RSVD alarm_dis RSVD RSVD Disable output on alarm: RSVD disable RSVD blank 1: When all Ix_ON low disconnects IOUTx and sends 0 code to IDAC (controlled by rising edge) Switch regref Color sequence output on: selector in 1: Ix_ON fall- case of falling edge: ing edge 0: Ix_ON rising edge 1: disable output current on alarm 1: 2-1-0 0: 2-0-1 0: do not disable Outputs disabled RSVD 1: IOUTx disabled 0: IOUTx enabled 0: Normal operation (01h[6] setting controls regref) 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name d7 02h input_ctrl timer_clk d6 Configuration register for PIN23 11: RSVD 10: Pin 23 is LP_MODE 01: Pin 23 is CLK_IN 00: Pin 23 is ALARM 0: Normal operation (timers use internal oscillator) 04h d5 pin23_def[1:0] 1: Use CLK_IN as clock for the timers (MPG/PWM) 03h Rev V4 d4 d3 d2 d1 d0 Default Type RSVD regref_pol I2_ON_pol I1_ON_pol I0_ON_pol 00000000 R/W Polarity of I2_ON Polarity of I1_ON Polarity of I0_ON 1: Flipped 1b: Flip polar0: Normal ity 1: Flipped 1: Flipped 0: Normal 0: Normal 00000000 R/W 00000000 R/W 10001100 R/W RSVD Flip regref counter polarity 0b: normal polarity clk_ctrl clk_delay RSVD clkin_div[1:0] duty_en Input clock programmable delay: 0000 = nodelay 0001 = 500nsec 0010 = 1000nsec … 1111 = 7500nsec RSVD Input clock divider: 00: 1 01: 2 10: 4 11: 3 1: enable duty cycle control RSVD 0: disable duty cycle control RSVD RSVD 05h out_ctrl2 feedONOff_iout2 feedBias_iout2[1:0] RSVD BiasOnOf_i out2 1: Closed loop IOUT2 output current control Set the bias level of the Regref2 loop: RSVD Increases Regref2 bias current to inprove performance at low currents 0: open loop output current control (Set to 1b in all cases if DC-DC converter is controlled by Regref for this output) 11: 1.8 V 10: 600 mV 01: 500 mV 00: 400 mV (00 is recommended) pd_iout2[1:0] Power down control 11: Regref2 always on regardless of Ix_ON signal 10: Fast power down 01: Deep sleep when Ix_ON=L 00: Deep sleep when Ix_ON=L 1: Enabled 0: Disabled 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name d7 06h out_ctrl1 feedONOff_iout1 feedBias_iout1[1:0] RSVD BiasOnOf_i out1 1: Closed loop IOUT1 output current control Set the bias level of the Regref1 loop: 11: 1.8 V 10: 600 mV 01: 500 mV 00: 400 mV RSVD Increases Regref1 bias current to inprove performance at low currents 0: open loop output current control (Set to 1b in all cases if DC-DC converter is controlled by Regref for this output) 07h out_ctrl0 tempsens_ctrl d6 d5 d4 d3 d2 d0 pd_iout1[1:0] Default Type 10001100 R/W 10001100 R/W 01100000 R/W Power down control 11: Output stage always on regardless of Ix_ON signal 10: Fast power down 01: Deep sleep when Ix_ON=L 00: Deep sleep when Ix_ON=L 0: Disabled feedBias_iout0[1:0] RSVD BiasOnOf_i out0 1: Closed loop IOUT0 output current control Set the bias level of the Regref0 loop: 11: 1.8 V 10: 600 mV 01: 500 mV 00: 400 mV RSVD Increases Regref0 bias current to inprove performance at low currents 1: Enabled temptest_ sel d1 1: Enabled feedONOff_iout0 0: open loop output current control (Set to 1b in all cases if DC-DC converter is controlled by Regref for this output) 08h Rev V4 pd_iout0[1:0] Power down control 11: Output stage always on regardless of Ix_ON signal 10: Fast power down 01: Deep sleep when Ix_ON=L 00: Deep sleep when Ix_ON=L 0: Disabled pd_temp 1: Powers down temp sensor temp_cal[3:0] temp_gain[1:0] Temperature sensor offset calibration Calibrate temp sensor gain 0: Temp sensor enabled 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name d7 d6 09h tia_ctrl cpd_comp cf_ctrl cz_ctrl rz_ctrl Controls value of TIA Cf Controls value of CZ: APC compensation control: 11: 14 pF 10: 10 pF 01: 8 pF 00: 4 pF Controls value of Rz: APC compensation control: 1x: 2.5kOhms 01: 3.75kOhms 00: 5kOhms Cpd compensation 1: 16 pF 0: 9 pF 0Ah apc_fe_ctrl 1: 700fF 0: 500fF d5 d4 d3 d2 d1 d0 Default Type rf_ctrl 00100110 R/W Controls value of Rf: TIA gain control: 11: 20kOhms 10/01: 40kOhms 00: 60kOhms tia_ctrl_d RSVD Cpd_comp[1:0] RSVD pd_fe RSVD Photodiode compensation for APC inputs RSVD APC photodiode amplifier power down 00000001 R/W 00000000 R/W 00010001 R/W 1: power down (no photodiode feedback or color sensor) 0: normal operation (APC Control) 0Bh bandgap RSVD bg_set set to 0101b RSVD 0Ch alarm_setup0 led_alrm_rc1 led_alarm_thres1 LED alarm time constant LED alarm threshold for channel 1 1: 5usec 0: 2usec 00: 200 mV 01: 150 mV 10: 100 mV 11: 50 mV en_ledalarm1 led_alrm_rc0 led_alarm_thres0 LED alarm LED alarm threshold for Power down channel 0 LED alarm for time constant channel 1 00: 200 mV 1: power down 1: 5usec 01: 150 mV 0: enable 0: 2usec 10: 100 mV 11: 50 mV en_ledalarm0 Power down LED alarm for channel 0 1: power down 0: enable 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 0Dh alarm_setup1 d7 d6 d5 d4 11h d3 d2 d1 d0 Default Type 00110001 R/W 00000000 R/W 00000000 R/W 00111111 R/W 00111111 R/W 00000000 R/W 00000000 R/W RSVD turnon_alarm_delay led_alrm_rc2 led_alarm_thres2 en_ledalarm2 RSVD Delay alarm after channel turn on LED alarm time constant LED alarm threshold for channel 2 Power down LED alarm for channel 2 1: 5usec 0: 2usec 00: 200 mV 01: 150 mV 10: 100 mV 11: 50 mV 11: 50usec 10: 100usec 01: 200usec 00: 500usec 10h Rev V4 iout2_msb 1: power down 0: enable RSVD iout2[9:8] RSVD IOUT2 MSBs iout2_lsb iout2[7:0] IOUT2 LSBs 12h iout2_scale RSVD iout2_scale[5:0] RSVD Adjusts IOUT2 full scale 63d = 2A ... 28d = 1A … 1d = 228.27 0d = 200 mA 13h 14h 15h iout2_scale_LP RSVD iout2_scale[5:0] RSVD Adjusts IOUT2 full scale when LP_MODE pin is low 63d = 2A … 1d = 228.27 0d = 200 mA iout1_msb iout1_lsb RSVD iout1[9:8] RSVD IOUT1 MSBs iout1[7:0] IOUT1 LSBs 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 16h iout1_scale 17h 18h 19h Rev V4 iout1_scale_LP d7 d6 d5 d4 d3 d2 d1 d0 RSVD iout1_scale[5:0] RSVD Adjusts IOUT1 full scale 63d = 2A ... 28d = 1A … 1d = 228.27 0d = 200 mA RSVD iout1_scale[5:0] RSVD Adjusts IOUT1 full scale when LP_MODE pin is low 63d = 2A … 1d = 228.27 0d = 200 mA iout0_msb iout0_lsb RSVD iout0[9:8] RSVD IOUT0 MSBs iout0[7:0] Default Type 00111111 R/W 00111111 R/W 00000000 R/W 00000000 R/W 00111111 R/W 00111111 R/W 11111111 R/W 11111111 R/W 11111111 R/W IOUT0 LSBs 1Ah 1Bh 1Ch iout0_scale iout0_scale_LP RSVD iout0_scale[5:0] RSVD Adjusts IOUT0 full scale 63d = 2A … 1d = 228.27 0d = 200 mA RSVD iout0_scale[5:0] RSVD Adjusts IOUT0 full scale when LP_MODE pin is low 63d = 2A … 1d = 228.27 0d = 200 mA alarm_th2 alarm_th2[7:0] Alarm threshold for IOUT2 (output DAC MSB) 1Dh alarm_th1 alarm_th1[7:0] Alarm threshold for IOUT1 (output DAC MSB) 1Eh alarm_th0 alarm_th0[7:0] Alarm threshold for IOUT0 (output DAC MSB) 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 1Fh RSVD d7 d6 d5 d4 d3 d2 d1 d0 RSVD Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00011100 R/W 00000000 R/W 00000000 R/W RSVD 20h RSVD RSVD RSVD 21h RSVD RSVD RSVD 22h RSVD RSVD RSVD 23h RSVD RSVD RSVD DC-DC converter Control REGISTERS 24h regref_setup extr_ctrl regref_ res2 regref_ res1 regref_mode 1: Use external resistor for DC-DC converter control 1: Cut resistor in half 1: Add 87 kΩ resistor in series to 13.7kOhms resistor DC-DC converter control mode 0: Normal operation 0: Normal resistor 0: Normal resistor pd_dac Must be set to 0b if an external DCDC is being 1: Analog con- controlled: trol 1: DAC pow0: Digital con- ered down trol 0: Normal operation pd_digapc idac_current dig_RC Must be set to 0b if external DC-DC is being controlled: 1: Double full scale IDAC current to 200 µA 1: Add 1usec RC filter to IOUT voltage when in digital control mode 0: Normal 1: Compar- operation (100 µA) ator and headroom reference powered down 0: Normal operation 0: Normal operation 25h 26h regref2_dac_MSB regref2_dac RSVD regref2_dac[8] RSVD REGREF DAC output for IOUT2, MSB regref2_dac[7:0] REGREF DAC output for IOUT2 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 27h regref2_ctrl1 28h regref2_ctrl0 d7 d6 d5 d4 2Ah d3 d2 d1 d0 headroom2[4:0] (100 mV/Amp, 70 mV min) regref2_dec[2:0] Controls headroom for IOUT2 00000: 0 mV 00001:10 mV 00010:20 mV 00011:30 mV …. 11111:310 mV (recommended) Select decimation factor for REGREF digital loop: 000: 1 001: 2 010: 4 011: 32 100: 64 101: 256 110: 512 111: 2048 (recommended) update_rate2[2:0] RSVD rregrefDAC2_init[1:0] regref_wait2[1:0] DAC update rate (12.5 MHz clock cycles) RSVD Initial value of DAC output for IOUT2 01b recommended Wait states after I_ON before enabling counting (IDAC current is fixed to initial value - this is not impacted by PWM or MPG) 000: No updates 001: 8 010: 512 (recommended) 011: 1024 100: 2048 101: 4096 110: 8192 111: 16374 (equiv. to 1.31 ms) 29h Rev V4 00: 0 01: previous value 10: value contained in regref2_dac[8:0] 11: 0 regref1_dac_MSB regref1_dac Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00: no wait 01: ~20usec 10: ~100usec 11: ~200usec RSVD regref1_dac[8] RSVD REGREF DAC output for IOUT1, MSB regref1_dac[7:0] REGREF DAC output for IOUT1 2Bh regref1_ctrl1 headroom1[4:0] regref1_dec[2:0] Controls headroom for IOUT1 00000: 0 mV 00001:10 mV 00010:20 mV 00011:30 mV …. 11111:310 mV (recommended) Select decimation factor for REGREF digital loop: 000: 1 001: 2 010: 4 011: 32 100: 64 101: 256 110: 512 111: 2048 (recommended) 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 2Ch regref1_ctrl0 d7 d6 d5 d4 2Eh d3 d2 d1 d0 Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W update_rate1[2:0] RSVD rregrefDAC1_init[1:0] regref_wait1[1:0] DAC update rate (12.5 MHz clock cycles) RSVD Initial value of DAC output for IOUT1 Wait states after I_ON before enabling counting (IDAC current is fixed to initial value - this is not impacted by PWM or MPG) 000: No updates 001: 8 010: 512 011: 1024 100: 2048 101: 4096 110: 8192 111: 16374 (equiv. to 1.31 ms) 2Dh Rev V4 00: 0 01: previous value 10: value contained in regref1_dac[8:0] 11: 0 regref0_dac_MSB regref0_dac 00: no wait 01: ~20usec 10: ~100usec 11: ~200usec RSVD regref0_dac[8] RSVD REGREF DAC output for IOUT0, MSB regref0_dac[7:0] REGREF DAC output for IOUT0 2Fh 30h regref0_ctrl1 regref0_ctrl0 headroom0[4:0] regref0_dec[2:0] Controls headroom for IOUT0 00000: 0 mV 00001:10 mV 00010:20 mV 00011:30 mV …. 11111:310 mV Select decimation factor for REGREF digital loop: 000: 1 001: 2 010: 4 011: 32 100: 64 101: 256 110: 512 111: 2048 (recommended) update_rate0[2:0] RSVD rregrefDAC0_init[1:0] regref_wait0[1:0] DAC update rate (12.5 MHz clock cycles) RSVD Initial value of DAC output for channel 0 01b recommended Wait states after I_ON before enabling counting (IDAC current is fixed to initial value - this is not impacted by PWM or MPG) 000: No updates 001: 8 010: 512 (recommended) 011: 1024 100: 2048 101: 4096 110: 8192 111: 16374 (equiv. to 1.31 ms) 00: 0 01: previous value 10: value contained in regref0_dac[8:0] 11: 0 00: no wait 01: ~20usec 10: ~100usec 11: ~200usec 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 31h alarm_idac2 d7 d6 d5 d4 d3 d2 d1 d0 alarm_th2[7:0] Default Type 11111111 R/W 11111111 R/W 11111111 R/W 01111111 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 Alarm threshold for IOUT2 (output DAC MSB) 32h alarm_idac1 alarm_th1[7:0] Alarm threshold for IOUT1 (output DAC MSB) 33h alarm_idac0 alarm_th0[7:0] Alarm threshold for IOUT0 (output DAC MSB) APC REGISTERS 34h apc_ctrl apc_clk CPC clock 1: Use external clock input (CLK_IN) 0: use internal oscillator 35h 36h target2_msb loop_select apc2_ch apc1_ch Selects APC Selects APC input for IOUT2 Selects APC input for type: IOUT1 00: APC_IN0 1: CPC 00: APC_IN0 01: APC_IN1 0: IPC 10: APC_IN2 01: APC_IN1 11: disable APC 10: APC_IN2 11: disable APC apc0_ch Selects APC input for IOUT0 00: APC_IN0 01: APC_IN1 10: APC_IN2 11: disable APC RSVD target2[12:8] RSVD MSB target DAC for gain of IOUT2 target2_lsb target2[7:0] LSB target DAC for gain of IOUT2 37h 38h target1_msb RSVD target1[12:8] RSVD MSB target DAC for gain of IOUT1 target1_lsb target1[7:0] LSB target DAC for gain of IOUT1 39h 3Ah target0_msb RSVD target0[12:8] RSVD MSB target DAC for gain of IOUT0 target0_lsb target0[7:0] LSB target DAC for gain of IOUT0 3Bh 3Ch target2_msb_LP RSVD target2_LP[12:8] RSVD MSB target DAC for gain of IOUT2 when LP_MODE=L target2_lsb_LP target2_LP[7:0] LSB target DAC for gain of IOUT2 when LP_MODE=L 3Dh 3Eh target1_msb_LP target1_lsb_LP RSVD target1_LP[12:8] RSVD MSB target DAC for gain of IOUT1 when LP_MODE=L target1_LP[7:0] LSB target DAC for gain of IOUT1 when LP_MODE=L 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 3Fh target0_msb_LP 40h Rev V4 d7 d6 d5 d4 d3 d2 d1 d0 RSVD target0_LP[12:8] RSVD MSB target DAC for gain of IOUT0 when LP_MODE=L target0_lsb_LP target0_LP[7:0] Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W LSB target DAC for gain of IOUT0 when LP_MODE=L CPC REGISTERS 41h 42h apc2_ctrl2 apc2_ctrl1 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] iturnon2 ck_div2[1:0] Initial step size in LSB of IOUT2 00: 1 01: 8 10: 16 11: 32 43h apc2_ctrl0 Mid step size in LSB of IOUT2 00: 1/2 of Step_init 01: 1/4 of Step_init 10: reserved 11: reserved 44h apc1_ctrl2 00: 1 01: 4 10: 8 11: 16 00: 0 01: previous value 10: value contained in bit iout2[9:0] 11: 0 Dec2[2:0] RSVD line_mode2 Digital filter decimation factor for IOUT2: RSVD Line mode for IOUT2 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 Clock divider for IOUT2 Initial value of IOUT2 1: OUT2 on only during CLK_IN=H 0: Ignore CLK_IN cpc_wait2[1:0] apc2_freeze 1: freeze APC Wait states before enabling APC (current is for IOUT2 fixed to initial value) 0: normal operation 00: no wait 01: ~20usec 10: ~100usec 11: ~200usec 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 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 45h apc1_ctrl1 46h 47h 48h Rev V4 d7 apc0_ctrl1 d5 d4 d3 d2 d1 d0 Step_init1[1:0] Step_mid1[1:0] iturnon1 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 Initial value of IOUT1 00: 0 01: previous value 10: value contained in bit iout1[9:0] 11: 0 Clock divider for IOUT1 00: 1 01: 4 10: 8 11: 16 apc1_ctrl0 apc0_ctrl2 d6 Dec1[2:0] RSVD line_mode1 Digital filter decimation factor for IOUT1: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 RSVD Line mode for IOUT1 1: OUT1 on only during CLK_IN=H 0: Ignore CLK_IN cpc_wait1[1:0] apc1_freeze Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 1: freeze APC Wait states before enabling APC (current is (both gain and offset) for fixed to initial value) IOUT1 00: no wait : normal oper01: ~20usec ation 10: ~100usec 11: ~200usec 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] iturnon0 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 Initial value of IOUT0 00: 0 01: previous value 10: value contained in bit iout0[9:0] 11: 0 Clock divider for IOUT0 00: 1 01: 4 10: 8 11: 16 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 49h apc0_ctrl0 d7 d6 d5 d4 d3 d2 Dec0[2:0] RSVD line_mode0 Digital filter decimation factor for IOUT0: 000: 1 001: 2 010: 4 011: 8 100: 16 101: 32 110: 64 111: 128 RSVD Line mode for IOUT0 1: OUT0 on only during CLK_IN=H 0: Ignore CLK_IN d1 cpc_wait0[1:0] d0 Default Type apc0_freeze 00000000 R/W 1: freeze APC Wait states before enabling APC (current is (both gain and offset) for fixed to initial value) IOUT0 00: no wait 0: normal 01: ~20usec operation 10: ~100usec 11: ~200usec IPC REGISTERS 4Ah ipc_setup pfet_test RSVD mirror ratio source_sink 1: Enable test mode for pfet mirror RSVD 1: 1:1 mirroring ratio 1: Current sinking MPD (pfet input stage) 0: Normal MPD 0: 4x mirroring ratio 0: Normal operation 4Bh ipc2_ctrl2 pd_precharge1 pd_precharge0 pre_chrg 1: power down precharge for APC_IN2 1: power down precharge for APC_IN1 1: power down precharge for APC_IN0 1: always ON 0: Normal operation 0: Normal operation 0: Normal operation pd_comp RSVD pd_ihelp2 cap2_sel[3:0] RSVD 1: Power down comparator 0: Normal operation RSVD Powers down 100 µA helper current : 1: Power down IPC2 charging capacitor value selector 0000 := 25.0 pF 0001 := 27.5 pF 0010 := 30.0 pF ipc2_ctrl1 00000000 0: Depends on channel being turned on RSVD 0: Normal operation 4Ch pd_precharge2 00000001 R/W 00000000 R/W ......... ......... 1111 := 62.5 pF RSVD ipd2_sel[4:0] RSVD Peak amplitude monitor photodetector 00000 = 100 µA 00001 = 200 µA …. 11111 = 3.2 mA 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 4Dh ipc2_ctrl0 4Eh ipc1_ctrl2 d7 d6 50h 51h ipc0_ctrl2 d3 d2 d1 RSVD Peak current into IPC2 charging capacitor 00000 = 10 µA 00001 = 20 µA …. 11111 = 320 µA pd_comp RSVD 1: Power down comparator ipc1_ctrl0 d4 ich2_sel[4:0] RSVD ipc1_ctrl1 d5 RSVD 0: Normal operation 4Fh Rev V4 hs_sel pd_ihelp1 cap1_sel[3:0] 1:Increase comparator bias current by 66% Powers down 100 µA helper current : 1: Power down IPC1 charging capacitor value selector 0000 := 25.0 pF 0001 := 27.5 pF 0010 := 30.0 pF 0: Normal operation 0: Normal operation RSVD Peak amplitude monitor photodetector 00000 = 100 µA 00001 = 200 µA …. 11111 = 3.2 mA RSVD ich1_sel[4:0] RSVD Peak current into IPC1 charging capacitor 00000 = 10 µA 00001 = 20 µA …. 11111 = 320 µA RSVD 1: Power down comparator 0: Normal operation Type 00000000 R/W 00000001 R/W 00000000 R/W 00000000 R/W 00000001 R/W 1111 := 62.5 pF ipd1_sel[4:0] pd_comp Default ......... ......... RSVD RSVD d0 hs_sel pd_ihelp0 cap0_sel[3:0] 1:Increase comparator bias current by 66% Powers down 100 µA helper current : 1: Power down IPC0 charging capacitor value selector 0000 := 25.0 pF 0001 := 27.5 pF 0010 := 30.0 pF 0: Normal operation 0: Normal operation ......... ......... 1111 := 62.5 pF 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. M08888 Registers Addr Register name 52h ipc0_ctrl1 53h Rev V4 d7 d6 ipc0_ctrl0 d5 d4 d3 d2 d1 RSVD ipd0_sel[4:0] RSVD Peak amplitude monitor photodetector 00000 = 100 µA 00001 = 200 µA …. 11111 = 3.2 mA RSVD ich0_sel[4:0] RSVD Peak current into IPC0 charging capacitor 00000 = 10 µA 00001 = 20 µA …. 11111 = 320 µA 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 00000000 R/W TIMER REGISTERS 54h 55h 56h clk_div pwm_msb clk_div_pwm[3:0] clk_div_mpg[3:0] PWM clock divider 0000 = 1 0001 = 2 0010 = 4 0011 = 8 0100 = 16 0101 = 32 0110 = 64 0111 = 128 MPG clock divider 0000 = 1 0001 = 2 0010 = 4 0011 = 8 0100 = 16 0101 = 32 0110 = 64 0111 = 128 RSVD on_count2[9:8] on_count1[9:8] on_count0[9:8] RSVD PWM IOUT2 (msb) PWM IOUT1 (msb) PWM IOUT0 (msb) pwm2 on_count2[7:0] PWM on count for IOUT2 57h pwm1 on_count1[7:0] PWM on count for IOUT1 58h pwm0 on_count0[7:0] PWM on count for IOUT0 59h 5Ah mpg_off_msb RSVD pulse_off2[9:8] pulse_off1[9:8] pulse_off0[9:8] RSVD MPG off IOUT2 (msb) MPG off IOUT1 (msb) MPG off IOUT0 (msb) mpg_off2 pulse_off2[7:0] MPG pulse off for IOUT2 5Bh mpg_off1 pulse_off1[7:0] MPG pulse off for IOUT1 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 5Ch mpg_off0 d7 d6 d5 d4 d3 d2 d1 d0 pulse_off0[7:0] Default Type 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00000000 R/W 00h R/W 00000000 R 00001100 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R MPG pulse off for IOUT0 5Dh 5Eh mpg_on_msb RSVD pulse_on2[9:8] pulse_on1[9:8] pulse_on0[9:8] RSVD MPG on IOUT2 (msb) MPG on IOUT1 (msb) MPG on IOUT0 (msb) mpg_on2 pulse_on2[7:0] MPG pulse on for IOUT2 5Fh mpg_on1 pulse_on1[7:0] MPG pulse on for IOUT1 60h mpg_on0 pulse_on0[7:0] MPG pulse on for IOUT0 61h start_op RSVD start_op RSVD 1b: Start operation 0b: Not operational Note: M08888 will not be operational until 1b is written 62h soft_reset Soft reset Writing AA causes a 16 refclk cycles to reset (self clear after reset) 63h 64h chip_id Revision identification: Chip identification 0000 1100 temp temp[7:0] Temperature readback 65h 66h rb_iout2_msb RSVD rb_iout2[9:8] RSVD Readback IOUT2 DAC MSB rb_iout2_lsb rb_iout2[7:0] Readback IOUT2 DAC LSB 67h 68h rb_regrefdac2_MSB rb_regrefdac2 RSVD rb_regrefdac2[8] RSVD Readback of IOUT2 DAC rb_regrefdac2[7:0] Readback of IOUT2 DAC. 69h rb_iout1_msb RSVD rb_iout1[9:8] RSVD Readback IOUT1 DAC MSB 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 6Ah rb_iout1_lsb d7 d6 d5 d4 d3 d2 d1 d0 rb_iout1[7:0] Default Type 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R 00000000 R Readback IOUT1 DAC LSB 6Bh 6Ch rb_regrefdac1_MSB RSVD rb_regrefdac1[8] RSVD Readback of IOUT1 DAC rb_regrefdac1 rb_regrefdac1[7:0] Readback of IOUT1 DAC. 6Dh 6Eh rb_iout0_msb RSVD rb_iout0[9:8] RSVD Readback IOUT0 DAC MSB rb_iout0_lsb rb_iout0[7:0] Readback IOUT0 DAC LSB 6Fh 70h rb_regrefdac0_MSB RSVD rb_regrefdac0[8] RSVD Readback of IOUT0 DAC rb_regrefdac0 rb_regrefdac0[7:0] Readback of IOUT0 DAC. 71h 72h alarm_ctrl alarm_iout alarm2 alarm1 alarm0 alarm_IDAC2 alarm_IDAC1 alarm_IDAC0 N/A N/A CPC alarm for IOUT2 Alarm for IOUT1 Alarm for IOUT0 Alarm for IDAC2 Alarm for IDAC1 Alarm for IDAC0 N/A N/A IPC_overshoot RSVD alarm_iout 2 alarm_iout 1 alarm_iout0 Alarm for high MPD current RSVD Alarm for open or short on IOUT2 Alarm for open or short on IOUT1 Alarm for open or short on IOUT0 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 73h RSVD d7 d6 d5 d4 d3 RSVD d2 d1 d0 Default Type 00000000 R/W 00000000 R/W RSVD 74h RSVD RSVD RSVD 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Table 3-1. Rev V4 M08888 Registers Addr Register name 75h strbalrm_ctrl d7 d6 d5 d4 d3 d2 RSVD reg_spl_dis RSVD RSVD Disables register sampling: RSVD 1: Disable register sampling (cannot read/ write to any register except 68h) d1 d0 Default Type strb_iout clear_alarm 00000000 R/W 11111111 R/W 1: strobes 1: Clear alam iout current before 0: Normal readback 0: Normal 0: Normal operation (all registers are accessible) 80h alarm_iout_mask alarm_iout_mask When 1 masks to 0 alarm bits in alarm_iout 49 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 M08888-11 High Performance RGB Driver for DLP/LCD/LCoS Projectors Rev V4 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. 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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. 50 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