LP8545 datasheet(19/44 Pages) TI1

19 / 44 page

EEPROM

NVM

8 x 8 bits

REGISTERS

ADDRESS 00h...72h

Startup or

EE_READ=1

User

Device Control

EEPROM

REGISTERS

Address A0h...A7h

EE_PROG = 1

Device Control

+1 LSB

PWM value 510 (10-bit)

PWM value 510 1/2 (10-bit)

PWM value 511 (10-bit)

LP8545

www.ti.com

SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

Figure 16. Example of the Dithering,

1-bit dither, 10-bit resolution

Driver Headroom Control

Driver headroom can be controlled with <DRV_HEADR[2:0]> EEPROM bits. Driver headroom control sets the

minimum threshold for the voltage over the LED output which has the smallest driver headroom and controls the

boost output voltage accordingly. Boost output voltage step size is 125 mV. The LED output which has the

smallest forward voltage is the one which has highest VF across the LEDs. The strings with highest forward

voltage is detected automatically. To achieve best possible efficiency smallest possible headroom voltage should

be selected. If there is high variation between LED strings, the headroom can be raised slightly to prevent any

visual artifacts.

EEPROM

EEPROM memory stores various parameters for chip control. The 64-bit EEPROM memory is organized as 8 x 8

bits. The EEPROM structure consists of a register front-end and the non-volatile memory (NVM). Register data

can be read and written through the serial interface, and data will be effective immediately. To read and program

NVM, separate commands need to be sent. Erase and program voltages are generated on-chip charge pump, no

other voltages than normal input voltage are required. A complete EEPROM memory map is shown in Table 3.

NOTE

EEPROM NVM can be programmed or read by customer for bench validation.

Programming for production devices should be done in TI production test, where

appropriate checks will be performed to confirm EEPROM validity. Writing to EEPROM

Control register of production devices is not recommended. If special EEPROM

configuration is required, please contact the TI Sales Office for availability.

Submit Documentation Feedback

Product Folder Links: LP8545

LP8545 датащи(PDF) 19 Page - Texas Instruments

LP8545 датащи(HTML) 19 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

датащи скачать

ссылки URL