TCA9534_16 Datasheet, PDF (22/38 Pages) Texas Instruments – Low Voltage 8-Bit I2C and SMBUS Low-Power I/O Expander with Interrupt Output and Configuration Registers

TCA9534
SCPS197B – SEPTEMBER 2014 – REVISED NOVEMBER 2016
SCL
SDA
Read From
Port
Data Into
Port
12 345678 9
Slave Address
Data From Port
S 0 1 0 0 A2 A1 A0 1 A
Data 1
Start
Condition
R/W
ACK From
Slave
Data 2
Data 3
t_ph
t_ps
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Data From Port
A
Data 4
NA P
ACK From
Master
NACK From
Master
Stop
Condition
Data 4
Data 5
INT
t_iv
t_ir
This figure assumes the command byte has previously been programmed with 00h.
Transfer of data can be stopped at any time by a Stop condition. When this occurs, data present at the latest
acknowledge phase is valid (output mode). It is assumed that the command byte previously has been set to 00 (Read
Input Port register).
This figure eliminates the command byte transfer, a restart, and slave address call between the initial slave address
call and actual data transfer from the P port (see the Reads section for these details).
Figure 32. Read Input Port Register
22
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