ADP1650ACPZ-R7 datasheet(19/32 Pages) AD

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ADP1650

Rev. C | Page 19 of 32

I2C INTERFACE

The ADP1650 includes an I2C-compatible serial interface for

control of the LED current, as well as for readback of 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 42 illustrates the I2C write sequence to a single register.

The subaddress content selects which of the nine ADP1650

registers is written to. The ADP1650 sends an acknowledgment

to the master after the 8-bit data byte has been written. Figure 43

shows the I2C read sequence of a single register.

The register definitions are shown in the I2C Register Map

section.

SUBADDRESS

CHIP ADDRESS

0 1

100

0 = WRITE

ADP1650 RECEIVES

DATA

MASTER

STOP

Figure 42. I2C Single Register Write Sequence

CHIP ADDRESS

01 100 0 0

MASTER

STOP

CHIP ADDRESS

0 1 10 00 0

1 0

0 = WRITE

1 = READ

ADP1650 SENDS

DATA

SUBADDRESS

Figure 43. I2C Single Register Read Sequence

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