Datasheet

ADP1649 Data Sheet
Rev. 0 | Page 18 of 28
I²C INTERFACE
The ADP1649 includes an I
2
C-compatible serial interface for
control of the LED current, as well as for readback of the system
status registers. The I
2
C chip address is 0x30 (0x60 in write
mode and 0x61 in read mode). Additional I
2
C addresses are
available on request.
Figure 39 illustrates the I
2
C 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 I
2
C read sequence of a single register. See the I²C
Register Map section for a list of register definitions.
Figure 39. I
2
C Single Register Write Sequence
Figure 40. I
2
C Single Register Read Sequence
SUBADDRESS
CHIP ADDRESS
0 1 1 0 0 0 0 0
0
0
0 = WRITE
0
ADP1649 ACK
ADP1649 ACK ADP1649 ACK
ADP1649 RECEIVES
DATA
S
T
S
P
MASTER
STOP
10779-039
ADP1649 ACK ADP1649 ACK ADP1649 ACK
CHIP ADDRESS
0 1 1 0 0 0 0 0
0
10
MASTER
STOP
CHIP ADDRESS
S
T
S
T
0 1 1 0 0 0 0 01
0
0 = WRITE 1 = READ
S
P
MASTER ACK
ADP1649 SENDS
DATA
SUBADDRESS
10779-040