pca9535ecmttxg ON Semiconductor, pca9535ecmttxg Datasheet - Page 2

• Manufacturer Part Number: pca9535ecmttxg
• Description: Pca9535e, Pca9535ec 16-bit Low-power I/o Expander For I2c Bus With Interrupt
• Manufacturer: ON Semiconductor

1. PCA9535EC I/Os are open−drain only. The portion of the PCA9535E schematic marked inside the dotted line box is not in
PCA9535EC.
configuration
write polarity
shift register
shift register
shift register
AD0
AD1
AD2
At power−on reset, all registers return to default values.
SDA
SCL
write pulse
V
V
read pulse
data from
data from
data from
DD
SS
pulse
pulse
write
PCA9535E
PCA9535EC
configuration
register
D
CK
FF
POWER−ON
Q
Q
RESET
FILTER
INPUT
Figure 2. Simplified Schematic of I/Os
Remark: All I/Os are set as inputs at reset.
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
(1)
Q1
OUTPUT
OUTPUT
PORTS
PORTS
INPUT/
INPUT/
Q2
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