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| TCA6408A Datasheet, PDF (22/35 Pages) Texas Instruments – LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS | |||
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TCA6408A
SCPS192C â APRIL 2009â REVISED JULY 2009............................................................................................................................................................. www.ti.com
APPLICATION INFORMATION
Figure 14 shows an application in which the TCA6408A can be used.
VCCI
(1.8 V)
VCC
SCL
Master
Controller SDA
INT
GND RESET
10 kW
(´ 4)
VCCI VCCP
1 16
14
VCCI VCCP
SCL
15
P0 4
SDA
13
INT
3
RESET
P1
TCA6408A
6
P2
2 ADDR
7
P3
100 kW (´ 3)
ALARM
(see Note D)
Subsystem 1
(e.g., Alarm)
A
5
ENABLE
B
9
P4
10
P5
Keypad
11
P6
12
P7
GND
8
A. Device address configured as 0100000 for this example.
B. P0 and P2âP4 are configured as inputs.
C. P1 and P5âP7 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
22
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Copyright © 2009, Texas Instruments Incorporated
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