TCA6408_09 Datasheet, PDF (21/31 Pages) Texas Instruments – LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

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TCA6408
LOW-VOLTAGE 8-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
APPLICATION INFORMATION
Figure 14 shows an application in which the TCA6408 can be used.
V_CCI
(1.8 V)
V_CC
10 kW
(x 4)
SCL
Master
Controller SDA
INT
GND _RESET
V_CCI V_CCP
1
16
14
V_CCI V_CCP
SCL
15
P0 ⁴
SDA
13
INT
3
RESET
P1
TCA6408
100 kW (x 3)
ALARM
(see note D)
Subsystem 1
(e.g., Alarm)
A
5
ENABLE
B
2 _ADDR
6
P2
7
P3
9
P4
10
P5
11
P6
12
P7
Keypad
GND
8
A. Device address configured as 0100000 for this example.
B. P0 and P2–P4 are configured as inputs.
C. P1 and P5-P7 are configured as outputs.
D. Resistors are required for inputs (on P port) that may float. If a driver to an input will never let the input float, a
resistor is not needed. Outputs (in the P port) do not need pullup resistors.
Figure 14. Typical Application
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