TCA9555 Datasheet, PDF (7/32 Pages) Texas Instruments – LOW VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

TCA9555
www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009
Data Output
by Transmitter
Data Output
by Receiver
SCL From
Master
S
Start
Condition
1
2
Figure 3. Acknowledgment on I²C Bus
BYTE
I²C slave address
P0x I/O data bus
P1x I/O data bus
7 (MSB)
L
P07
P17
Interface Definition
BIT
6
5
4
3
H
L
L
A2
P06
P05
P04
P03
P16
P15
P14
P13
NACK
ACK
8
9
Clock Pulse for
Acknowledgment
2
1
0 (LSB)
A1
A0
R/W
P02
P01
P00
P12
P11
P10
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