Datasheet

P00
ADDR
P12
P13
P14
P15
GND
INT
SDA
SCL
TCA6424
SDA
SCL
INT
GND
Keypad
Status
Monitor
ALARM
Subsystem1
(e.g., Alarm)
A
B
Master
Controller
1
P01
ENABLE
2
P02
P03
P04
P05
P06
P07
P10
P11
P16
P17
P27
P26
P25
P24
P23
P22
P21
P20
6
5
4
3
7
8
9
10
11
12
13
14
15
16
18
17
19
20
21
22
23
24
29
31
30
32
26
25
27
RESET
29
RESET
V
(1.8V)
CCI
V
CC
V
CCP
10kW 10kW
10k (x7)W
10kW
10kW
V
CCP
V
CCI
V
CCI
(SeeNoteD)
TCA6424
www.ti.com SCPS175A –NOVEMBER 2007–REVISED NOVEMBER 2009
APPLICATION INFORMATION
Figure 14 shows an application in which the TCA6424 can be used.
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
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Product Folder Link(s): TCA6424