LP8551TLXSLASHNOPB datasheet(28/47 Pages) TI1

28 / 47 page

LP8551

SNVS673E – APRIL 2010 – REVISED SEPTEMBER 2014

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8.6.1.8 EEPROM Control

Address 72h

Reset value 0000 0000b

EEPROM CONTROL REGISTER

EE_READY

EE_INIT

EE_PROG

EE_READ

Name

Bit

Access

Description

EE_READY

EEPROM ready

0 = EEPROM programming or read in progress

1 = EEPROM ready, not busy

EE_INIT

R/W

EEPROM initialization bit. This bit must be written 1 before EEPROM read or

programming.

EE_PROG

R/W

EEPROM programming.

0 = Normal operation

1 = Start the EEPROM programming sequence. EE_INIT must be written 1 before

EEPROM programming can be started. Programs data currently in the EEPROM

registers to non volatile memory (NVM). Programming sequence takes about 200

ms. Programming voltage is generated inside the chip.

EE_READ

R/W

EEPROM read

0 = Normal operation

1 = Reads the data from NVM to the EEPROM registers. Can be used to restore

default values if EEPROM registers are changed during testing.

Programming sequence (program data permanently from registers to NVM):

1. Turn on the chip by writing BL_CTL bit to 1 and BRT_MODE[1:0] to 10b (05h to address 01h)

2. Write data to EEPROM registers (address A0h…A7h)

3. Write EE_INIT to 1 in address 72h. (04h to address 72h)

4. Write EE_PROG to 1 and EE_INIT to 0 in address 72h. (02h to address 72h)

5. Wait 200 ms.

6. Write EE_PROG to 0 in address 72h. (00h to address 72h)

Read sequence (load data from NVM to registers):

1. Turn on the chip by writing BL_CTL bit to 1 and BRT_MODE[1:0] to 10b (05h to address 01h).

2. Write EE_INIT to 1 in address 72h. (04h to address 72h)

3. Write EE_READ to 1 and EE_INIT to 0 in address 72h. (01h to address 72h)

4. Wait 200 ms.

5. Write EE_READ to 0 in address 72h. (00h to address 72h)

NOTE

Data written to EEPROM registers is effective immediately even if the EEPROM

programming sequence has not been done. When power is turned off, the device,

however, loses the data if it is not programmed to the NVM. During start-up the device

automatically loads the data from NVM to registers.

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 are 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.

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