TCA9555 Datasheet, PDF (22/32 Pages) Texas Instruments – LOW VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

TCA9555
SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com
APPLICATION INFORMATION
Figure 15 shows an application in which the TCA9555 can be used.
V_CC
(5 V)
V_CC
10 kΩ 10 kΩ
SCL
Master
Controller SDA
INT
GND
10 kΩ 10 kΩ
24 Ω 2 kΩ
V_CC
22
SCL
23
SDA
1
INT
P00 ⁴
5
P01
P02 ⁶
7
P03
8
P04
9
P05
TCA9555
3 _A2
2 _A1
21 _A0
P06 ¹⁰
P07 ¹¹
P10 ¹³
P11 ¹⁴
P12 ¹⁵
P13 ¹⁶
P14 ¹⁷
P15 ¹⁸
P16 ¹⁹
GND P17 ²⁰
12
Keypad
Subsystem 1
(e.g., Temperature
Sensor)
INT
Subsystem 2
(e.g., Counter)
RESET
A
ENABLE
B
V_CC
Controlled Switch
(e.g., CBT Device)
ALARM
Subsystem 3
(e.g., Alarm)
A. Device address is configured as 0100100 for this example.
B. P00, P02, and P03 are configured as outputs.
C. P01, P04–P07, and P10–P17 are configured as inputs.
D. Pin numbers shown are for the PW package.
Figure 15. Typical Application
22
Submit Documentation Feedback
Product Folder Link(s): TCA9555
Copyright © 2009, Texas Instruments Incorporated