LM3532EVM/NOPB

User's Guide SLOA171B – June 2012 – Revised April 2013 AN-2249 LM3532 Evaluation Kit 1 Introduction The LM3532 Evaluation Board is designed to fully evaluate the LM3532 Triple Output, White LED Driver with I2C-Compatible Interface. For a detailed description of the LM3532 refer to the LM3532 datasheet. The board comes equipped with 3 series strings of 10 white LEDs. Additionally there are two ambient light sensors (Avago APDS-9005) which feed into the LM3532’s ambient light sensor inputs (ALS1 and ALS2). Each Input and/or output from the LM3532 has its own separate header pin to serve as a test-point. Figure 1 shows the schematic of the Evaluation Board. ALS2 ALS1 PWM2 PWM1 T1 HWEN INT GND GND I2C VS3 VS2 VS1 RPWM2 RPWM1 R1 RHWEN RINT RSDA RSCL VI/O VPU VL ALS2 ALS1 PWM1 R2 R3 PWM2 RS3 INT ALS1 HWEN OVP LM3532 SCL LED3 LED2 T1 LED1 IN SCL GND VL SW 3.3V VALS SDA RS1 D2J D3J ALS2 SDA RS2 D1J D3I D2I D1I D3H D2H D1H D3G D2G D1G D3F D2F D1F D3E D2E D1E D3D D2D D1D D3C D2C D1C D3B D2B D1B D3A D2A D1A DS2 COUT2 CIN2 L2 VOUT CL SW VLED3 GND GND VLED2 VLED1 VCC VIN VL Figure 1. LM3532 Evaluation Board Schematic All trademarks are the property of their respective owners. SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 1 LM3532 Evaluation Board Bill of Materials www.ti.com The software supplied with the LM3532 Evaluation Kit (LM3532 GUI.exe) provides an easy method to evaluate all the features of the device via a PC. The LM3532 GUI.exe, when loaded on a PC, communicates to the LM3532 Eval Board through the Texas Instruments USB to I2C controller (USB2ANY). 2 2 LM3532 Evaluation Board Bill of Materials Component Symbol Value Manufacturer Part # Size (L x W x H) U1 LED Driver Texas Instruments LM3532 (1.745mm x 1.845mm x 0.4mm) L1 22µH, ISAT = 700mA, RL = 0.36Ω TDK LPS4018-223ML (3.9mm x 3.9mmx 1.7mm) CIN 2.2 µF, 25V TDK C1608X5R1E225K 0603 (1.6mm x 0.8mm x 0.8mm) COUT 1 µF, 50V TDK C2012X7R1H105K 0805 (2mm x 1.25mm x 1.25mm) D1-D10 White LED ROHM SML312WBCW1 0805 RHWEN 4.7 kΩ Vishay-Dale CRCW06034K70JNEA 0603 RSDA, RSDA 4.7 kΩ Vishay-Dale CRCW06034K70JNEA 0603 RINT 4.7 kΩ Vishay-Dale CRCW06034K70JNEA 0603 D1 Schottky, 40V, 250mA On-Semi NSR0240V2T1G SOD-523 (1.2mm x 0.8mm x 0.6mm) RS1, RS2, RS3 10Ω, 0.1% Vishay CRCW080510R0 FKEA 0805 ALS1 0 - 1100 LUX Ambient Light Sensor Avago APDS-9005 (1.6mm x 1.5mm x 0.55mm) ALS2 0 - 1100 LUX Ambient Light Sensor Avago APDS-9005 (1.6mm x 1.5mm x 0.55mm) R2, R3 0Ω Vishay-Dale CRCW06030000Z0EA 0603 CL 10µF TDK C1608X5R1A106M 0805 RPWM1, RPWM2 4.7kΩ Vishay-Dale CRCW06034K70JNEA 0603 AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated LM3532 Evaluation Board Layout www.ti.com 3 LM3532 Evaluation Board Layout Figure 2. Top Layer Figure 3. Mid Layer 1 SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 3 LM3532 Evaluation Board Layout www.ti.com Figure 4. Mid Layer 2 Figure 5. Bottom Layer 4 AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated LM3532 Board Set-up www.ti.com 4 LM3532 Board Set-up To operate the LM3532 Evaluation Board connect a jumper across the (VIN VL) header, a jumper at the (3.3V VPU VL) header, and a jumper at the VOUT header. The board should come with these jumpers already installed. The jumper at (VIN VL) connects the supply at VL to the IN pin of the device. The jumper at (3.3V VPU VL) connects the on-board pull-up resistors at SDA, SCL, HWEN, and INT to the center pin (VPU). VPU can be connected to either the supply at VL or the regulated 3.3V supply from the USB2ANY board. The jumper at VOUT will connect the output of the LM3532's boost converter to the LED string anodes. Once all the jumpers are in place, connect a 2.5V to 5.5V supply at the VL and GND banana plugs. 5 USB2ANY Interface board The LM3532 Evaluation Board can be controlled directly by connecting an I2C master to the SCL and SDA headers, or through the USB2ANY interface board. The USB2ANY board is designed to interface the LM3532 Eval Board to a PC which runs the LM3532 GUI.exe software. The LM3532 GUI.exe program needs to have the two .dll files (USB2ANY_API.dll and HID_API.dll) copied to the same folder which contains the LM3532 GUI.exe program. Once the LM3532 Evaluation Board has power applied, plug the USB2ANY into the bottom side connector with the included ribbon cable, then open the LM3532 GUI.exe program. 6 LM3532 GUI.exe (Graphical User Interface) The LM3532 graphical user interface program (LM3532 GUI.exe) provides an easy method to demonstrate all the features within the LM3532. The program is divided into 6 separate tabbed sections: a Configuration Tab, a separate tab for each Control Bank (A, B, C), an Ambient Light Sensor (ALS) Tab, and a Demo Tab which provides controls to drive the PWM inputs via the USB2ANY's PWM output channels. Writing to the device happens automatically when any of the pull-down menu's are selected, or when a button is pushed. 7 LM3532 Configuration Tab The Configuration Tab (Figure 6) contains the global registers for the LM3532 that control the current sink assignments, the enable registers, the feedback enable/disable, and the ramp rates. There is also a field for direct read and writes to the I2C registers. Additionally there is a Default button which when pushed, places the LM3532 GUI.exe in the default state and writes all the LM3532 registers to their default (poweron reset) state. Table 1 through Table 5 describe these registers in detail. Figure 6. LM3532 Configuration Tab SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 5 LM3532 Configuration Tab www.ti.com Table 1. Output Configuration (0x10) Bits [5:4] ILED3 Control 00 = ILED3 is controlled by Control A PWM and Control A Brightness Registers (default) 01 = ILED3 is controlled by Control B PWM and Control B Brightness Registers 1X = ILED3 is controlled by Control C PWM and Control C Brightness Registers Bits [3:2] ILED2 Control Bits [1:0] ILED1 Control 00 = ILED2 is controlled by Control A PWM and Control A Brightness Registers (default) 01 = ILED2 is controlled by Control B PWM and Control B Brightness Registers 1X = ILED2 is controlled by Control C PWM and Control C Brightness Registers 00 = ILED1 is controlled by Control A PWM and Control A Brightness Registers (default) 01 = ILED1 is controlled by Control B PWM and Control B Brightness Registers 1X = ILED1 is controlled by Control C PWM and Control C Brightness Registers Table 2. Start/Stop Ramp (0x11) Bits [5:3] Shutdown Ramp Bits [2:0] Startup Ramp 000 = 8µs/step (2.048ms from Full-Scale to 0) (default) 001 = 1.024 ms/step (261 ms) 010 = 2.048 ms/step (522 ms) 011 = 4.096 ms/step (1.044s) 100 = 8.192 ms/step (2.088s) 101 = 16.384 ms/step (4.178s) 110 = 32.768 ms/step (8.356s) 111 = 65.536 ms/step (16.711s) 000 = 8µs/step (2.048ms from 0 to Full-Scale) (default) 001 = 1.024 ms/step (261 ms) 010 = 2.048 ms/step (522 ms) 011 = 4.096 ms/step (1.044s) 100 = 8.192 ms/step (2.088s) 101 = 16.384 ms/step (4.178s) 110 = 32.768 ms/step (8.356s) 111 = 65.536 ms/step (16.711s) Table 3. Run Time Ramps (0x12) Bits [5:3] Ramp Down Bits [2:0] Ramp Up 000 = 8µs/step (default) 001 = 1.024 ms/step 010 = 2.048 ms/step 011 = 4.096 ms/step 100 = 8.192 ms/step 101 = 16.384 ms/step 110 = 32.768 ms/step 111 = 65.536 ms/step 000 = 8µs/step (default) 001 = 1.024 ms/step 010 = 2.048 ms/step 011 = 4.096 ms/step 100 = 8.192 ms/step 101 = 16.384 ms/step 110 = 32.768 ms/step 111 = 65.536 ms/step Table 4. Feedback Enable (0x1C) Bit 2 ILED3 Feedback Enable Bit 1 ILED2 Feedback Enable Bit 0 ILED1 Feedback Enable 0 = ILED3 is not part of the boost control loop 1 = ILED3 is part of the boost control loop (default) 0 = ILED2 is not part of the boost control loop 1 = ILED2 is part of the boost control loop (default) 0 = ILED1 is not part of the boost control loop 1 = ILED1 is part of the boost control loop (default) Table 5. Control Enable (0x1D) 6 Bit 2 Bank C Enable Bit 1 Bank B Enable Bit 0 Bank A Enable 0 = Control C is disabled (default) 1 = Control C is enabled 0 = Control B is disabled (default) 1 = Control B is enabled 0 = Control A is disabled (default) 1 = Control A is enabled AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Control Bank A, B, and C Tabs www.ti.com 8 Control Bank A, B, and C Tabs There is a separate tab for each of the LM3532's Control Banks (Control Bank A, Control Bank B, and Control Bank C). Each tab has the registers that are specific to each control bank. Table 6 through Table 8 detail the bank specific registers. Figure 7. Control Bank Tab (Control Bank A Shown) Table 6. Control (A/B/C) PWM (0x13/0x14/0x15) Bit 6 Zone 4 PWM Enable Bit 5 Zone 3 PWM Enable Bit 2 Zone 2 PWM Enable Bit 2 Zone 1 PWM Enable Bit 2 Zone 0 PWM Enable Bit 1 PWM Input Polarity Bit 0 PWM Select 0 = Active PWM input is disabled in Zone 4 (default) 0 = Active PWM input is disabled in Zone 3 (default) 0 = Active PWM input is disabled in Zone 2 (default) 0 = Active PWM input is disabled in Zone 1 (default) 0 = Active PWM input is disabled in Zone 0 (default) 0 = active low polarity 0 = PWM1 input is mapped to Control Bank A (default) 1 = Active PWM input is enabled in Zone 4 1 = Active PWM input is enabled in Zone 3 1 = Active PWM input is enabled in Zone 2 1 = Active PWM input is enabled in Zone 1 1 = Active PWM 1 = active high 1 = PWM2 is input is enabled in polarity (default) mapped to Zone 0 Control Bank A Table 7. Control (A/B/C) Brightness (0x16/0x17/0x18) Bits [4:2] Control A Brightness Pointer (I2C Current Control Only) Bit 1 LED Current Mapping Mode Bit 0 Bank A Current Control 000 = Control X Zone Target 0 001 = Control X Zone Target 1 010 = Control X Zone Target 2 011 = Control X Zone Target 3 1XX = Control X Zone Target 4 (default) 0 = Exponential Mapping (default) 1 = Linear Mapping 0 = ALS Current Control 1 = I2C Current Control (default) SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 7 Control Bank A, B, and C Tabs www.ti.com Table 8. Control (A/B/C) Full-Scale Current (0x17/0x19/0x1B) Bits [4:0] Control A/B/C Full-Scale Current Select Bits 00000 = 5 mA 00001 = 5.8 mA 00010 = 6.6 mA 00011 = 7.4 mA 00100 = 8.2 mA 00101 = 9 mA 00110 = 9.8 mA 00111 = 10.6 mA 01000 = 11.4 mA 01001 = 12.2 mA 01010 = 13 mA 01011 = 13.8 mA 01100 = 14.6 mA 01101 = 15.4 mA 01110 = 16.2 mA 01111 = 17 mA 10000 = 17.8 mA 10001 = 18.6mA 10010 = 19.4 mA 10011 = 20.2 mA (default) 10100 = 21 mA 10101 = 21.8 mA 10110 = 22.6 mA 10111 = 23.4 ma 11000 = 24.2 mA 11001 = 25 mA 11010 = 25.8 mA 11011 = 26.6 mA 11100 = 27.4 mA 11101 = 28.2 mA 11110 = 29 mA 11111 = 29.8 mA In I2C Current Control, any of the 5 Zone Target Registers for the particular Control Bank can be the LED brightness register. This is set according to Control A, B, or C Brightness Configuration Registers (Bits [4:2]). In the LM3532 GUI.exe, once a Zone Target value is written, the Write button must be pressed to write the contents of all zone targets to the LM3532. 8 AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Control Bank (A/B/C) Zone Targets www.ti.com 9 Control Bank (A/B/C) Zone Targets Control A Control A Control A Control A Control A Zone Target Zone Target Zone Target Zone Target Zone Target Register 0 Register 1 Register 2 Register 3 Register 4 maps maps maps maps maps directly directly directly directly directly to Zone 0 to Zone 1 to Zone 2 to Zone 3 to Zone 4 (Address (Address (Address (Address (Address 0x70) 0x71) 0x72) 0x73) 0x74) Control B Control B Control B Control B Control B Zone Target Zone Target Zone Target Zone Target Zone Target Register 0 Register 1 Register 2 Register 3 Register 4 maps maps maps maps maps directly directly directly directly directly to Zone 0 to Zone 1 to Zone 2 to Zone 3 to Zone 4 (Address (Address (Address (Address (Address 0x75) 0x76) 0x77) 0x78) 0x79) Control C Zone Target Register 0 maps directly to Zone 0 (Address 0x7A) Control C Zone Target Register 1 maps directly to Zone 1 (Address 0x7B) Control C Zone Target Register 2 maps directly to Zone 2 (Address 0x7C) Control C Zone Target Register 3 maps directly to Zone 3 (Address 0x7D) Control C Zone Target Register 4 maps directly to Zone 4 (Address 0x7E) 10 ALS Control Tab The ALS Control Tab (Figure 8) contains all the registers that are programmable for the LM3532's Ambient Light Sensor Interface. Table 9 through Table 12 describe these registers. The evaluation board has two on board light sensors (ADPS-9005 from Avago). These connect directly to the LM3532's ALS1 and ALS2 inputs. The APDS-9005 requires a minimum of 1V saturation voltage for proper operation and has a typical response of 400nA/lux. For example, for detecting 0 to 2k Lux across the LM3532's 2V ALS input voltage range would require the APDS9005 be biased from a 3V minimum supply (supplied at the VALS header on the board), with an ALS load resistor of 2V/(2k Lux x 400nA/Lux) = 2.5kOhms. This corresponds to an ALS resistor Select Register code of 0x0F for register 0x20 (ALS1) or 0x0F for register 0x21 (ALS2). Figure 8. ALS Control Tab SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 9 ALS Control Tab www.ti.com Table 9. ALS Resistor (R_ALS0, 0x20/R_ALS1, 0x21) Bit [4:0] ALS1/ALS2 Resistor Select Bits 00000 = High Impedance (default) 00001 = 37 kΩ 00010 = 18.5 kΩ 00011 = 12.33 kΩ 00100 = 9.25 kΩ 00101 = 7.4 kΩ 00110 = 6.17 kΩ 00111 = 5.29 kΩ 01000 = 4.63 kΩ 01001 = 4.11 kΩ 01010 = 3.7 kΩ 01011 = 3.36 kΩ 01100 = 3.08 kΩ 01101 = 2.85 kΩ 01110 = 2.64 kΩ 01111 = 2.44 kΩ 10000 = 2.31 kΩ 10001 = 2.18 kΩ 10010 = 2.06 kΩ 10011 = 1.95 kΩ 10100 = 1.85 kΩ 10101 = 1.76 kΩ 10110 = 1.68 kΩ 10111 = 1.61 kΩ 11000 = 1.54 kΩ 11001 = 1.48 kΩ 11010 = 1.42 kΩ 11011 = 1.37 kΩ 11100 = 1.32 kΩ 11101 = 1.28 kΩ 11110 = 1.23 kΩ 11111 = 1.19 kΩ Table 10. Down Delay (0x22) Bit [5] ALS Fast startup Enable 0 = ALS Fast startup is Disabled 1 = ALS Fast startup is Enabled (default) 10 Bits [4:0] Down Delay 00000 = 6 total Average Period delay for Down Delay Control (default) : : : 11111 = 34 total Average Periods of Delay for Down Delay Control AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated ALS ZONE BOUNDARIES www.ti.com Table 11. ALS Configuration (0x23) Bits [7:6] ALS Input Select Bit [5:4] ALS Control 00 = Average of ALS1 and ALS2 is used to determine backlight current 01 = Only the ALS1 input is used to determine backlight current (default) 10 = Only the ALS2 input is used to determine the backlight current 11 = The maximum of ALS1 and ALS2 is used to determine the backlight current Bit 3 ALS Enable Bits [2:0] ALS Average Time 00 = Direct ALS Control. ALS 0 = ALS is disabled inputs respond to up and down (default) transitions (default) 1 = ALS is enabled 01 = This setting is for a future mode. 1X = Down Delay Control. Extra delays of 3 x tAVE to 34 x tAVE are added for down transitions, before the new backlight target is programmed. 000 = 17.92 ms 001 = 35.84 ms 010 = 71.68 ms 011 = 143.36 ms 100 = 286.72 ms (default) 101 = 573.44 ms 110 = 1146.88 ms 111 = 2293.76 ms Table 12. ALS Zone Information (0x24) Bit 3 Zone Change Bit 0 = No change in ALS Zone (default) 1 = There was a change in the ALS Zone since the last read of this register. This bit is cleared on read back. 11 Bits [2:0] Brightness Zone 000 = Zone 0 (default) 001 = Zone 1 010 = Zone 2 011 = Zone 3 1XX = Zone 4 ALS ZONE BOUNDARIES There are 4 ALS Zone Boundary registers that form the boundaries for the 5 Ambient Light Zones. Each Zone Boundary register is 8 bits with a maximum voltage of 2V. This gives a step size for each Zone Boundary Register bit of: ZoneBoundaryLSB = 2V = 7.8 mV 255 (1) ALS Zone Boundary 0 High (Address 0x60), default = 0x35 (415.7 mV) ALS Zone Boundary 0 Low (Address 0x61), default = 0x33 (400 mV) ALS Zone Boundary 1 High (Address 0x62), default = 0x6A (831.4 mV) ALS Zone Boundary 1 Low (Address 0x63), default = 0x66 (800 mV) ALS Zone Boundary 2 High (Address 0x64), default = 0xA1 (1262.7 mV) ALS Zone Boundary 2 Low (Address 0x65), default = 0x99 (1200 mV) ALS Zone Boundary 3 High (Address 0x66), default = 0xDC (1725.5 mV) ALS Zone Boundary 3 Low (Address 0x67), default = 0xCC (1600 mV) 12 ADC and ADC Average Readback (0x27, 0x28) Both the ADC readback and ADC average readback are read-only registers that read the contents at the output of the LM3532's ADC. The ADC readback is the 8-bit data which is sampled at 7.142 ksps and updated every 154 µs. The ADC average readback is the 8-bit value from the ADC Readback Register which is averaged over the programmed ALS Average Time. Once either the ADC Read or ADC Average Read button is pushed, the appropriate field gets updated with the data. SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback AN-2249 LM3532 Evaluation Kit Copyright © 2012–2013, Texas Instruments Incorporated 11 Demo Tab 13 www.ti.com Demo Tab The Demo tab (Figure 9) provides the controls for activating the USB2ANY's PWM outputs which are then applied to the LM3532's PWM inputs. PWM1 and PWM2 correspond to the LM3532's PWM1 and PWM2 inputs. The field (PWM Duty Cycle (%)) is the duty cycle input from the user in steps of 0.1%. Once a new duty cycle is entered and the Update button is pressed, the duty cycle output from the USB2ANY board is changed. Figure 9. Demo Tab 12 AN-2249 LM3532 Evaluation Kit SLOA171B – June 2012 – Revised April 2013 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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