pca9655e ON Semiconductor, pca9655e Datasheet - Page 2

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

configuration
Remark: All I/Os are set as inputs at reset.
write polarity
shift register
shift register
shift register
AD0
AD1
AD2
SDA
SCL
write pulse
V
V
read pulse
data from
data from
data from
DD
SS
pulse
pulse
At power−on reset, all registers return to default values.
write
PCA9655E
configuration
register
D
CK
FF
POWER−ON
Q
Q
RESET
FILTER
INPUT
Figure 2. Simplified Schematic of I/Os
output port
register
D
CK
Figure 1. Block Diagram
FF
BLOCK DIAGRAM
http://onsemi.com
Q
I
2
C−BUS/SMBus
CONTROL
2
input port
register
polarity inversion
register
D
CK
D
CK
FF
FF
Q
Q
write pulse
write pulse
read pulse
read pulse
8−bit
8−bit
Q1
OUTPUT
OUTPUT
PORTS
PORTS
INPUT/
INPUT/
Q2
100 kW
LP filter
V
DD
output port
register data
V
I/O pin
V
input port
register data
to INT
polarity
inversion
register data
DD
SS
IO1_0
IO1_1
IO1_2
IO1_3
IO1_4
IO1_5
IO1_6
IO1_7
IO0_0
IO0_1
IO0_2
IO0_3
IO0_4
IO0_5
IO0_6
IO0_7
INT