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SNVU382A – April 2014 – Revised June 2014

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Copyright © 2014, Texas Instruments Incorporated

Evaluation Software

Chapter 9

SNVU382A – April 2014 – Revised June 2014

Evaluation Software

9.1

Setup

Evaluation software is available for download from the

TI web site.

The LP8860-Q1EVM is connected via USB to the computer and controlled with special evaluation
software (Windows). An MSP430 microcontroller is used with the EVM to provide easy I

2

C/SPI

communication, external PWM, boost SYNC and VSYNC control, VDDIO/EN, IF, and FAULT pins control
with the LP8860-Q1 via USB. The EVM board and LP8860-Q1 VDDIO is powered by default via USB.
VDD and VIN for the LP8860-Q1 must be supplied with an external power supply with high enough current
limit.

When the board is connected to a computer, Windows should recognize it automatically and start to install
the driver. A “Found New Hardware” dialog box prompts the user to locate the missing driver. Select “No,
not this time” and continue with “Next”. Select “Install from a list or specific location (Advanced)” to install
the driver. Select the directory where the supplied TI_CDC_Virtual_Port driver is. Windows should now
install the driver, and the PC can communicate with the evaluation module using a virtual COM port. If
Windows cannot find the driver, the user needs to manually install the TI_CDC_Virtual_Port driver from
the Device Manager. There should be a "USB OK" message on the status bar at the bottom of evaluation
program, when the board is recognized. The green LED should blink on the evaluation board, when the
board is powered from USB. If the board is not recognized, check the USB address from Windows Control
Panel. The USB address should always be less than or equal to 9 (from COM1 to COM9) (see

Appendix A

). Also switching to another USB port might solve the issue.

I

2

C/SPI, PWM, SYNC, VSYNC, VDDIO/EN, IF, and FAULT communication can be controlled from an

external source using pin headers if needed. Test point for all of the signals is provided, but jumpers to the
on-board microcontroller must be removed if an external source is used for control.

9.2

Usage

The LP8860-Q1 evaluation software helps the user to control the evaluation hardware connected to the
computer. The evaluation software consists of three sections: tab selection, register selection, and register
control section. In the tab selection the user can switch between

Pin Control

,

Brightness Controls

,

Fault and status

,

Boost

,

Fault and adaptive voltage control

,

LED Drivers

,

Temperature

,

EEPROM

map

and

History

tabs. In the left-hand side of the evaluation program the register view (see

Figure 9-1

) is

always visible. From this view the user can see the register addresses, register names, and register
values. The user can select the register that needs to be changed. Selected register is marked with red X
beside the register value. When the user selects the register, the selected register can be viewed in detail
at the bottom of the evaluation software. This view tells the register address, register name, register
default value, register bits and current register value. The user can also read and write the register bits by
pushing the

RD

-button (read) and

WR

-button (write).

In the

File

menu the user can save register or EEPROM settings to a file, or load ready-made register or

EEPROM setups from a file to the LP8860-Q1 registers.

In the

Operation

menu the user can read register settings or EEPROM context with

Read Registers

from

the LP8860-Q1 memory so that the GUI reflects the current state of the LP8860-Q1.

Operation

menu has

controls for EEPROM, such as

Unlock

,

Lock

,

Read

and

Burn EEPROM

. With

Direct control

the user

can manually control registers by selecting address and data in hexadecimal format.

Execute macro

executes macro from text file, where first hexadecimal number in string is register address and second is
data which should be written.

Содержание LP8860-Q1

Страница 1: ...Using the LP8860 Q1EVM Evaluation Module User s Guide Literature Number SNVU382A April 2014 Revised June 2014 ...

Страница 2: ...us Tab 25 9 2 4 Boost Tab 26 9 2 5 Fault and Adaptive Voltage Control Tab 27 9 2 6 LED Drivers Tab 28 9 2 7 Temperature Tab 31 9 2 8 EEPROM Map Tab 32 9 2 9 History Tab 33 A Virtual COM Port Configuration 34 B Virtual COM Port Communication 37 C LED Load Board 38 D Quick Start Guide 41 D 1 EVM Board Default Jumper and Cable Positions 41 D 2 First Step Light up LEDs 46 D 3 Changing EEPROM Parameter...

Страница 3: ...tness Control Tab 24 9 4 Fault and Status Tab 25 9 5 Boost Controls Tab 26 9 6 Interactive Boost Diagram Window 26 9 7 Fault and Adaptive Voltage Control Tab 27 9 8 LED Fault And Adaptive Voltage Control Functionality Diagram 27 9 9 LED Driver Controls 28 9 10 LED Driver Diagram Window 28 9 11 PLL Diagram Window 29 9 12 PLL Calculator for External VSYNC Steps Show Order for Applying Commands 29 9 ...

Страница 4: ...www ti com 4 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated List of Figures ...

Страница 5: ...hapter 7 Evaluation Board Schematic Chapter 8 Bill of Materials Chapter 9 Evaluation Software Appendix A Virtual COM Port Configuration Appendix B Virtual COM Port Communication Appendix C LED Load Board Appendix D Quick Start Guide Related Documentation from Texas Instruments LP8860 Q1 data sheet FCC Warning This equipment is intended for use in a laboratory test environment only It generates use...

Страница 6: ...ssor to provide easy communication via USB Power supply connection for the VIN VDD and test points for each signal can be found on the evaluation board Windows SW is used to control I2 C SPI registers of the device A separate LED board can be used as a load it is also possible to connect LCD panel to the output connectors For evaluation purposes the EVM has been tested over a 3 V to 48 V input ran...

Страница 7: ...ise and smaller boost output capacitors The LP8860 Q1 can drive an external p FET to disconnect the input supply from the system in the event of a fault and reduce inrush current and standby power consumption The input voltage range for LP8860 Q1 is 3 V to 48 V to support car stop start conditions The device integrates extensive safety and protection features 2 1 Features Four High Precision Curre...

Страница 8: ... MOSI SDA MISO NSS VDDIO EN IF FAULT LP8860 Q1 Q2 D L VIN 3 40 V VDD 3 3 V BOOST SYNC V H SYNC BRIGHTNESS FAULT RESET ENABLE FAULT VDDIO Typical Applications www ti com 8 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Description of the LP8860 Q1 2 3 Typical Applications Figure 2 1 Typical Application Simple PWM Control VDD 3 3 V C...

Страница 9: ... SCLK SCL MOSI SDA MISO NSS VDDIO EN IF FAULT LP8860 Q1 Q2 D L VIN 3 40 V VDD 5 V BOOST SYNC V H SYNC BRIGHTNESS NSS ENABLE FAULT VDDIO SCLK MOSI MISO www ti com Typical Applications 9 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Description of the LP8860 Q1 Figure 2 2 Typical Application SPI Control VDD 5 V Charge Pump Off 2 Str...

Страница 10: ...WM SCLK SCL MOSI SDA MISO NSS VDDIO EN IF FAULT LP8860 Q1 Q2 D L VIN 3 40 V VDD 3 3 V BOOST SYNC V H SYNC BRIGHTNESS FAULT RESET ENABLE FAULT VDDIO SCL SDA Typical Applications www ti com 10 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Description of the LP8860 Q1 Figure 2 3 Typical Application I2 C Control VDD 3 3 V Charge Pump ...

Страница 11: ...C VSYNC PWM SCLK SCL MOSI SDA MISO NSS VDDIO EN IF FAULT LP8860 Q1 D L VIN 3 40 V VDD 5 V BRIGHTNESS ENABLE www ti com Typical Applications 11 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Description of the LP8860 Q1 Figure 2 4 Typical Application without Serial Interface VDD 5 V Charge Pump Off 3 Strings ...

Страница 12: ...nterface selection Jumpers for connecting C digital signals to LP8860 Q1 LP8860 Q1 needed external components FAULT red LED USB ok blinking green LED 12 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Hardware Setup Chapter 3 SNVU382A April 2014 Revised June 2014 Hardware Setup Figure 3 1 shows connectors and main components on the ...

Страница 13: ...014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Board Layout Chapter 4 SNVU382A April 2014 Revised June 2014 Board Layout Figure 4 1 Top Layer Figure 4 2 Bottom Layer GND ...

Страница 14: ...tors Feedback line Connection between PGND and GND LP8860 Q1 ISENSE FB SGND PWM OUT1 OUT2 OUT3 OUT4 L1 D1 VBATT FILTER VSYNC SD GD VSENSE_N Q2 ISENSE_GND CPUMP C1P C1N VDD SYNC VDDIO EN SCLK SCL MOSI SDA MISO NSS PGND LGND PAD IF VSENSE_P R1 TSENSE ISET FAULT SQW VDD 3 3V Q1 R2 C1 C2 C3 C4 C5 R3 R4 R5 C6 C7 C8 C9 2 32 31 5 6 3 1 12 9 13 18 16 15 14 17 19 20 11 10 29 23 7 8 21 22 24 25 4 26 27 28 3...

Страница 15: ...opyright 2014 Texas Instruments Incorporated Board Stackup Chapter 5 SNVU382A April 2014 Revised June 2014 Board Stackup Figure 5 1 Evaluation Board Stackup Details 2 layer board FR4 Top layer copper 35 µm Core 1 6 mm Bottom Layer copper 35 µm Surface finish immersion gold ...

Страница 16: ... the VDD_UVLO voltage level and the VDDIO EN voltage is set above threshold voltage 1 2 V 6 1 Start up Sequence The backlight is started either by setting PWM input high or by writing not zero brightness value to registers depending on the brightness control mode and phase shift configuration See the LP8860 Q1 datasheet for details 6 2 Shutdown Sequence The backlight is shut down either with setti...

Страница 17: ... VSSU 49 PU 0 DP 50 PUR 51 PU 1 DM 52 VBUS 53 VUSB 54 V18 55 AVSS2 56 P5 2 XT2IN 57 P5 3 XT2OUT 58 TEST SBWTCK 59 PJ 0 TDO 60 PJ 1 TDI TCLK 61 PJ 2 TMS 62 PJ 3 TCK 63 RST NMI SBWTDIO 64 QFN PAD 65 U2 MSP430F5510IRGC Green 1 2 D2 Orange 1 2 D3 GND LED2 LED2 LED1 LED1 NSS UC MISO UC SDA MOSI UC SCL SCLK UC FAULT UC SYNC UC VSYNC UC PWM UC EN UC IF UC 1 50k R17 10k R18 VCC SDA MOSI UC SCL SCLK UC FAU...

Страница 18: ...0 175u 677k HSYNC 50kHz BW3db 330Hz VCO Mhz C33 C32 R21 5 22n 322n 5 6k 10 12n 161n 11 2k 20 6 2n 80n 22 3k 40 3 1n 40n 44 7k HSYNC 20kHz BW3db 330Hz VCO Mhz C33 C32 R21 5 10n 129n 14k 10 5n 65n 28k 20 2 5n 32n 56k 40 1 2n 16n 112k C33 C32 84 5k R21 GND GND C1P 1 C1N 2 VDD 3 SQW 4 VSENSE_N 5 VSENSE_P 6 ISET 7 TSENSE 8 FILTER 9 SGND 10 FAULT 11 SYNC 12 VSYNC 13 MISO 14 MOSI SDA 15 SCLK SCL 16 NSS 1...

Страница 19: ...31C102KAT2A 1 C17 CAP CERM 10uF 16V 20 X5R 0603 Taiyo Yuden EMK107BBJ106MA T 1 C18 CAP CERM 47pF 50V 5 C0G NP0 0603 Kemet C0603C470J5GACTU 1 C20 C24 C27 C28 C29 CAP CERM 0 1uF 16V 20 X7R 0603 Kemet C0603C104M4RACTU 5 C21 C22 C23 C26 CAP CERM 1uF 10V 10 X5R 0603 Kemet C0603C105K8PACTU 4 C25 CAP CERM 0 22uF 16V 10 X7R 0603 Kemet C0603C224K4RACTU 1 C30 C31 CAP CERM 22pF 50V 5 C0G NP0 0603 Kemet C0603...

Страница 20: ...2512 Bourns CRA2512 FZ R020ELF 1 R4 RES 20k ohm 5 0 1W 0603 Vishay Dale CRCW060320K0JNEA 1 R5 RES 0 025 ohm 1 3W 2512 Bourns CRA2512 FZ R025ELF 1 R6 R7 RES 27 ohm 5 0 1W 0603 Vishay Dale CRCW060327R0JNEA 2 R8 R12 RES 10 ohm 5 0 1W 0603 Vishay Dale CRCW060310R0JNEA 2 R9 R16 R17 RES 1 50k ohm 1 0 1W 0603 Yageo America RC0603FR 071K5L 3 R10 RES 1 0Meg ohm 5 0 1W 0603 Vishay Dale CRCW06031M00JNEA 1 R1...

Страница 21: ...I PWM SYNC VSYNC VDDIO EN IF and FAULT communication can be controlled from an external source using pin headers if needed Test point for all of the signals is provided but jumpers to the on board microcontroller must be removed if an external source is used for control 9 2 Usage The LP8860 Q1 evaluation software helps the user to control the evaluation hardware connected to the computer The evalu...

Страница 22: ... Graphical control tab Small picture frame blue registers red EEPROM none pin control or protocol Firmware compilation date Usage www ti com 22 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Evaluation Software Figure 9 1 Main Window Structure ...

Страница 23: ...ntrol Tab From the Pin Control tab see Figure 9 2 the user can control all the basic functions of the device Figure 9 2 Main Window and Pin Control Tab In this tab Interface mode I2 C SPI can be set VDDIO EN control enables disables the device Frequency generators PWM for brightness control SYNC for boost and VSYNC for LED output PWM synchronization are in this tab ...

Страница 24: ...l brightness control functions of the device Here are provided additional register based controls like slope control current control current scale and EEPROM control If all outputs are configured as display mode outputs only Display Cluster_1 brightness and current controls can be used Additional controls are functional when one or more outputs are in cluster mode Please refer to the LP8860 Q1 dat...

Страница 25: ... Status tab see Figure 9 4 the user has access to LP8860 Q1 faults and status bits Faults can be reset by software fault reset register write or hardware NSS pin in I2 C interface mode Temperature and output current PWM reading are available from this tab as well Output PWM and current reading can help to understand better Hybrid PWM and Current dimming functionality Figure 9 4 Fault and Status Ta...

Страница 26: ...rom the Boost Control tab see Figure 9 5 the user controls all boost functions of the device Figure 9 5 Boost Controls Tab This tab controls all boost functionality bits charge pump and gate driver controls By clicking Diagram button the user can open interactive boost diagram window which shows all parameters in block diagram Figure 9 6 Interactive Boost Diagram Window ...

Страница 27: ...trol tab see Figure 9 7 the user controls fault and adaptive boost settings Figure 9 7 Fault and Adaptive Voltage Control Tab Fault comparators are used for LED fault detection and adaptive boost control Clicking Diagram button opens LED fault and adaptive voltage control diagram see Figure 9 8 This window explains LED fault and adaptive boost control functionality Figure 9 8 LED Fault And Adaptiv...

Страница 28: ...rols LED driver settings maximum current scale for all modes initial current for display mode and current correction for every outputs LED output PWM controls input brightness PWM controls and PLL controls are available from this tab as well By clicking the Diagram button opens window with LED driver diagram Figure 9 10 and PLL Diagram Figure 9 11 PLL calculator for defining settings for external ...

Страница 29: ...VU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Evaluation Software Figure 9 11 PLL Diagram Window Figure 9 12 PLL Calculator for External VSYNC Steps Show Order for Applying Commands ...

Страница 30: ...sage www ti com 30 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Evaluation Software Figure 9 13 PLL Calculator for Internal Oscillator ...

Страница 31: ...rporated Evaluation Software 9 2 7 Temperature Tab From the Temperature tab see Figure 9 14 the user controls internal and external sensors functionality current de rating with internal temperature sensor LED temperature control mode and current dimming with external temperature sensor Figure 9 14 Temperature Sensors Control ...

Страница 32: ...opyright 2014 Texas Instruments Incorporated Evaluation Software 9 2 8 EEPROM Map Tab From the EEPROM Map tab see Figure 9 15 the user can see actual value of EEPROM registers bit and control bits directly by writing or reading bytes buttons W and R on the right side Figure 9 15 EEPROM Map ...

Страница 33: ... 2014 Texas Instruments Incorporated Evaluation Software 9 2 9 History Tab The History tab see Figure 9 16 provides information on the I2 C SPI writes used to configure control the LP8860 Q1 device This can be used as a reference for developing software for real application Figure 9 16 History Tab ...

Страница 34: ...iguration When the USB COM port number is bigger than 9 the evaluation program is not able to recognize the board COM port number can be manually changed from Windows Device Manager The below figures describe this sequence in Windows7 The Device Manager can be found from the Control Panel Note that one may need to have Administrator rights to make the changes Figure A 1 Device Manager View Select ...

Страница 35: ... 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Virtual COM Port Configuration Figure A 2 Open Properties by Clicking Right Mouse Button on Virtual COM Port Figure A 3 Select Port Settings from the Virtual COM Port Properties ...

Страница 36: ...April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Virtual COM Port Configuration Figure A 4 Select Advanced from Virtual COM Port Properties and Select COM Port Number 9 or smaller ...

Страница 37: ...nfigured as outputs I1234 Serial interface read 12 interface and address for I2C 0x80 SPI otherwise I2C 34 register Returns error code and data I8010 00_28_OK 0x0A SPI Read register 0x10 Return error 00 no errors and date 0x28 LED_FAULTS for LP8860 Q1 O123456 Serial interface write 12 interface and address for I2 C 0x80 SPI otherwise I2 C 34 register 56 data Returns error code O2D1101 00_OK 0x0A I...

Страница 38: ...drivers and can use up to 6 strings and up to 20 LEDs in the string number of LEDs in use are defined by jumpers Cree Xlamp ML B LEDs with maximum current 175 mA and maximum forward voltage 3 5 mA 80 mA 3 3 V typ are used on the board For LP8860 Q1 4 strings are assembled NOTE The LED board is not included with the EVM contact your local TI sales representative if board is needed Figure C 1 LED Lo...

Страница 39: ...1 2 3 J58 1 2 3 J59 1 2 3 J60 1 2 3 J61 1 2 3 J62 1 2 3 J63 GND 1 2 3 4 J64 D80 D79 D78 D77 D76 D75 D74 D73 1 2 3 J77 1 2 3 J78 1 2 3 J79 1 2 3 J80 1 2 3 J81 1 2 3 J82 1 2 3 J83 1 2 3 J84 GND 1 2 3 4 J85 D100 D99 D98 D97 D96 D95 D94 D93 1 2 3 J98 1 2 3 J99 1 2 3 J100 1 2 3 J101 1 2 3 J102 1 2 3 J103 1 2 3 J104 1 2 3 J105 GND 1 2 3 4 J106 D120 D119 D118 D117 D116 D115 D114 D113 1 2 3 J119 1 2 3 J12...

Страница 40: ...mber Qty R1 R2 R3 R4 R5 R6 Resistor 10 0 ohm 1 0 1W 0603 not assembled Vishay Dale CRCW060310R0FKEA 6 J1 J22 J43 J64 J85 J106 J127 Header 100mi 2x2 Samtec TSW 102 07 G D 7 J2 J21 J23 J42 J44 J63 J65 J84 J86 J105 J107 J126 J129 Header 100mi 3x1 Samtec TSW 103 07 G S 121 J130 Header 100mi 7x1 Samtec TSW 107 07 G S 1 D1 D120 Cool White SMD LED XLamp mL B Cree MLBAWT A1 0000 000W51 120 Figure C 4 Forw...

Страница 41: ...D contains step by step explanations about how to start using the LP8860 Q1 EVM The assumption is that an optional LED load board with EVM is used Some examples refer to eep files example default EEPROM 300kHz eep These files are provided as part of the LP8860 Q1EVM software which can be downloaded from the LP8860 Q1 tools folder on the Texas Instruments website D 1 EVM Board Default Jumper and Ca...

Страница 42: ...ntation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide Figure D 1 and Figure D 2 show the jumper and cable positions when the EVM is delivered NOTE Keep jumper J1 at a 3 3 V setting to ensure safe operation regardless of RAIL value MSP430 doesn t tolerate a 5 V input or output voltage ...

Страница 43: ...om EVM Board Default Jumper and Cable Positions 43 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide Figure D 1 Jumper Positions ...

Страница 44: ... CPUMP should be shorted EVM Board Default Jumper and Cable Positions www ti com 44 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide Figure D 2 CPUMP Jumper ...

Страница 45: ...www ti com EVM Board Default Jumper and Cable Positions 45 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide ...

Страница 46: ...t 5V supply to J6 Check jumper J8 it should be at EXT EXT RAIL position For basic functionality testing demo purposes you can also use USB cable connected to J4 to provide 5V In this case J8 should be at 5V position 3 Connect VBATT 12V supply to J2 4 Run software a Press Init USB the user should see line stating firmware version This step is not mandatory if software is opened after USB was connec...

Страница 47: ... SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide d Set LED brightness using the Display Cluster 1 control Default mode default EEPROM is set to Display mode ...

Страница 48: ...OM Parameters The procedure is similar for any EEPROM parameter change Section D 3 describes general procedure In following chapters some specific examples are given 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab 2 Read EEPROM 3 Unlock EEPROM 4 Change parameter 5 If user wants to save new setting in EEPROM Burn EEPROM After EEPROM burning toggle VDDIO EN ...

Страница 49: ...k Copyright 2014 Texas Instruments Incorporated Quick Start Guide D 4 Recovering Original EEPROM Parameters To recover original EEPROM settings 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab 2 Unlock EEPROM if it is not done already 3 Load EEPROM setup file default EEPROM 300kHz eep ...

Страница 50: ... EEPROM Parameters www ti com 50 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide 4 Burn EEPROM 5 Toggle VDDIO EN to restart the LP8860 Q1 ...

Страница 51: ... signal is generated by MSP430 so that the user does not need to bring external signal for the first testing To use PWM input pin for brightness control EEPROM setting needs to be modified using the following procedure 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab 2 In LED drivers tab for Display brightness mode select PWM input pin duty cycle control 3 If the ...

Страница 52: ...and slope time can be adjusted In GUI slope is controlled on Brightness Controls tab Slope control is effective through brightness control registers brightness change can be controlled by sliding control However manually using the sliding control in the GUI may introduce some unintended delay Another option is to use external PWM pin for brightness control See Section D 5 for instructions how to s...

Страница 53: ... Switching Frequency to 2 2 MHz By default the boost switching frequency is 300 kHz see Boost tab in GUI The procedure for testing boost operation at 2 2 MHz 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab 2 Unlock EEPROM if it is not done already 3 Load EEPROM setup file for 2 2 MHz default EEPROM 2200kHz eep This file contains optimized parameter set for 2 2 MH...

Страница 54: ...to 2 2 MHz www ti com 54 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide 4 Burn EEPROM if necessary 5 LEDs can be turned on from Brightness controls tab ...

Страница 55: ...sabling boost adaptive mode Because of this the LED current is also limited to avoid overheating In normal operation an LED string in cluster mode must be connected to a separate supply instead of the LP8860 Q1 boost if string s in display mode use s boost for powering The procedure for testing cluster mode 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab if you h...

Страница 56: ...rightness Control www ti com 56 SNVU382A April 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated Quick Start Guide 4 Brightness of each LED string can be controlled individually through Cluster 1 4 ...

Страница 57: ...operation without MCU the most straightforward way to control brightness is to use an external PWM input signal To use PWM input pin for brightness control the EEPROM setting needs to be modified using the following procedure 1 Make sure LED brightness is 0 Also check that PLL is disabled in LED drivers tab 2 Unlock EEPROM 3 In LED drivers tab for Display brightness mode select PWM input pin duty ...

Страница 58: ... checked from the LP8860 Q1 register SYNC VSYNC connect to ground not used in this example MISO leave floating SPI interface output not used in this example SDA SCL connect to ground I2 C is not used NSS input for clearing faults PWM connect external PWM signal 100 500 Hz for brightness control EN enable for the LP8860 Q1 IF connect to ground by connecting J20 to Manual and J18 to I2C position Sig...

Страница 59: ... Incorporated Revision History Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Changes from Original April 2014 to A Revision Page Changed terminal to pin preview to production data 5 Deleted values 7 Changed Applications list 7 Changed wording in first para Chapter 6 16 ...

Страница 60: ... TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN including but not limited to any patent right copyright mask work right or other intellectual property right relating to any combination machine or process in which TI product...

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