TCA6424 Datasheet, PDF (23/29 Pages) Texas Instruments – LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

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TCA6424
LOW-VOLTAGE 24-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS175 – NOVEMBER 2007
APPLICATION INFORMATION
Figure 14 shows an application in which the TCA6424 can be used.
V_CCI
(1.8 V)
V_CC
SCL
Master
Controller SDA
INT
GND _RESET
V_CCI V_CCP
10 kW 10 kW 10 kW
31
27
10 kW
V_CCI
29
SCL
V_CCP
P00
1
30
SDA
32
INT
29
RESET
P01 ²
Status
Monitor
3
P02
TCA6424 _P03 4
P04 ⁵
24 _P27
23 _P26
22 _P25
21 _P24
20
P23
19
P22
18
P21
P05 ⁶
7
P06
8
P07
9
P10
P11 ¹⁰
P12 ¹¹
P13 ¹²
17
P20
P14 ¹³
26 _ADDR
P15 ¹⁴
P16 ¹⁵
P17 ¹⁶
GND
25
10 kW (x 7)
ALARM
(See Note D)
Subsystem 1
(e.g., Alarm)
A
ENABLE
B
Keypad
A. Device address configured as 0100000 for this example.
B. P00 and P02–P10 are configured as inputs.
C. P01, P11-P17, and P20-P27 are configured as outputs.
D. Resistors are required for inputs (on P port) that may float. If a driver to an input will not let the input float, a resistor is
not needed. Outputs (in the P port) do not need pullup resistors.
Figure 14. Typical Application
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TCA6424
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