PCA9557 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCA9557 Datasheet PDF : 16 Pages
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Philips Semiconductors
8-bit I2C and SMBus I/0 port with reset
Product data
PCA9557
BLOCK DIAGRAM
PCA9557
A0
A1
A2
SCL
SDA
INPUT
FILTER
VDD
VSS
RESET
POWER-ON
RESET
I2C/SMBus
CONTROL
8-BIT
WRITE pulse
INPUT/
OUTPUT
PORTS
READ pulse
SYSTEM DIAGRAM
Figure 2. Block diagram
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
SW00827
VCC= 16
GND = 8
Input Port
Q7
Polarity Inversion
Q7
Configuration
Q7
Output Port
Q7
1.1 KΩ
I/O0
6
15 RESET
1.1 KΩ
Q6
Q6
Q6
Q6
I/O1
7
Q5
Q5
Q5
Q5
I/O2
9
1
SCL
1.6 KΩ
I2C/SMBus
Interface
Q4
Q4
logic
Q4
Q4
I/O3
10
2
SDA
1.6 KΩ
Q3
Q3
Q3
Q3
I/O4
11
5 A2
or
1.1 KΩ
Q2
Q2
Q2
Q2
I/O5
12
4 A1
3 A0
1.1 KΩ
or
1.1 KΩ
or
Q1
Q1
Q1
Q1
I/O6
13
Q0
Q0
Q0
Q0
I/O7
14
Figure 3. System diagram
SW00794
2001 Dec 12
3
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