Philips Semiconductors
8-bit I2C and SMBus I/O port with 2-kbit EEPROM
Product data sheet
PCA9500
TYPICAL APPLICATION
VDD
VDD
10 kΩ
SCL
MASTER
CONTROLLER
SDA
GND
10 kΩ
10 kΩ
(optional)
VDD
SCL
I/00
SDA
I/01
I/02
I/03
PCA9500
I/04
I/05
A2
I/06
A1
I/07
A0
VSS
NOTE: GPIO device address configured as 0100100 for this example
EEPROM device address configured as 1010100 for this example
I/00, I/02, I/03, configured as outputs
I/01, I/04, I/05, configured as inputs
I/006, I/07, are not used and have to be configured as outputs
Figure 19. Typical application
2 kΩ
SUBSYSTEM 1
(e.g. temp sensor)
INT
RESET
SUBSYSTEM 2
(e.g. counter)
A
ENABLE
Controlled Switch
(e.g. CBT device)
B
ALARM
SUBSYSTEM 3
(e.g. alarm
system)
VDD
SW01076
2004 Sep 30
12