TCA6416A Datasheet, PDF (11/32 Pages) Texas Instruments – LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6416A
www.ti.com ....................................................................................................................................................................................................... SCPS194 – MAY 2009
SCL
12 345 67R9
Slave Address
Data From Port
Data From Port
SDA
Read From
Port
S0
1 00
0
0
AD
DR
1
A
Data 1
Start
Condition
R/W
ACK From
Slave
A
Data 4
NA P
ACK From
Master
NACK From
Master
Stop
Condition
Data Into
Port
Data 2
Data 3
Data 4
t_ph
t_ps
Data 5
INT is cleared
by Read from Port
INT
t_iv
t_ir
Stop not needed
to clear INT
A. 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).
B. This figure eliminates the command byte transfer, a restart, and slave address call between the initial slave address
call and actual data transfer from P port (see Figure 8).
Figure 9. Read Input Port Register
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