pca9655e ON Semiconductor, pca9655e Datasheet - Page 7

• Manufacturer Part Number: pca9655e
• Description: Pca9655e Remote 16-bit I/o Expander For I2c Bus With Interrupt
• Manufacturer: ON Semiconductor

Device Address
send the address of the slave it is accessing and the operation
it wants to perform (read or write) following a START
condition. The slave address of the PCA9655E is shown in
Figure 5. Address pins AD2, AD1, and AD0 choose 1 of 64
slave addresses. To conserve power, no internal pull−up
resistors are provided on AD2, AD1, and AD0.
operation while a logic 0 selects a write operation.
Table 6. PCA9655E ADDRESS MAP
Before the bus master can access a slave device, it must
A logic 1 on the last bit of the first byte selects a read
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
AD2
Address Input
GND
GND
GND
GND
GND
GND
GND
GND
AD1
SDA
SDA
SDA
SDA
SDA
SDA
SDA
SDA
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
GND
GND
GND
GND
GND
GND
GND
GND
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
AD0
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
A6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A5
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0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
7
A4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A6
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Slave Address
Figure 5. PCA9655E device Address
A5
A2
A4
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
programmable
slave address
A3
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A2
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
A1
A0
HEX
2Ch
3Ch
4Ch
5Ch
20h
22h
24h
26h
28h
2Ah
2Eh
30h
32h
34h
36h
38h
3Ah
3Eh
40h
42h
44h
46h
48h
4Ah
4Eh
50h
52h
54h
56h
58h
5Ah
5Eh
R/W