0

bit7

0

bit6

1

bit5

EN3B

bit4

EN5A

bit3

ENC

bit2

ENB

bit1

ENA

bit0

MSB

LSB

ADR6

bit7

ADR5

bit6

ADR4

bit5

ADR3

bit4

ADR2

bit3

ADR1

bit2

ADR0

bit1

R/W

bit0

MSB

LSB

0

0

0

1

1

1

1

I

2

C Slave Address (chip address)

0

1

0

1

1

0

0

LM27965

LM27965-M

start

msb Chip Address lsb

w

ack

msb Register Add lsb

ack

msb

DATA

lsb

ack

stop

ack from slave

ack from slave

ack from slave

SCL

SDIO

start

Id = 36h

w

ack

addr = 10h

ack

ack

DGGUHVV K¶06 data

stop

LM27965

www.ti.com

SNVS380B – MAY 2006 – REVISED FEBRUARY 2013

Figure 12. Write Cycle

w = write (SDIO = "0")

r = read (SDIO = "1")

ack = acknowledge (SDIO pulled down by either master or slave)

id = chip address, 36h for LM27965 or 38h for LM27965-M

The chip address for LM27965 is 0110110, or 36h. The chip address for LM27965-M is 0111000, or 38h.

Figure 13. Chip Address

INTERNAL REGISTERS OF LM27965

Register

Internal Hex Address

Power On Value

General Purpose Register

10h

0010 0000

Bank A Brightness Control Register

A0h

1110 0000

Bank B Brightness Control Register

B0h

1110 0000

Bank C Brightness Control Register

C0h

1111 1100

Figure 14. General Purpose Register Description

Internal Hex Address: 10h

NOTE

ENA: Enables DxA LED drivers (Main Display)

ENB: Enables DxB LED drivers (Aux Lighting)

ENC: Enables D1C LED driver (Indicator Lighting)

EN5A: Enables D5A LED voltage sense

EN3B: Enables D3B LED driver and voltage sense

Copyright © 2006–2013, Texas Instruments Incorporated

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