ADP1649ACBZ-R7 datasheet(18/28 Pages) AD

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ADP1649

Data Sheet

Rev. 0 | Page 18 of 28

I²C INTERFACE

The ADP1649 includes an I2C-compatible serial interface for

control of the LED current, as well as for readback of the system

status registers. The I2C chip address is 0x30 (0x60 in write

mode and 0x61 in read mode). Additional I2C addresses are

available on request.

Figure 39 illustrates the I2C write sequence to a single register.

The subaddress content selects which of the nine ADP1649

registers is written to. The ADP1649 sends an acknowledgment

to the master after the 8-bit data byte has been written. Figure 40

shows the I2C read sequence of a single register. See the I²C

Figure 39. I2C Single Register Write Sequence

Figure 40. I2C Single Register Read Sequence

SUBADDRESS

CHIP ADDRESS

0 = WRITE

ADP1649 RECEIVES

DATA

MASTER

STOP

CHIP ADDRESS

0 0

MASTER

STOP

CHIP ADDRESS

0 1

0 = WRITE

1 = READ

ADP1649 SENDS

DATA

SUBADDRESS

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