PCA9556 Просмотр технического описания (PDF) - Philips Electronics
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PCA9556 Datasheet PDF : 13 Pages
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Philips Semiconductors
Octal SMBus and I2C registered interface
Product data
PCA9556
BLOCK DIAGRAM
A0
A1
A2
SCL
SDA
VDD
VSS
RESET
SYSTEM DIAGRAM
VCC= 16
GND = 8
15 RESET
1.1 KΩ
1
SCL
1.6 KΩ
2
SDA
1.6 KΩ
5 A2
or
1.1 KΩ
4 A1
3 A0
1.1 KΩ
or
1.1 KΩ
or
INPUT
FILTER
POWER-ON
RESET
I/O0
I/O1
I/O2
SMBus
8-BIT
INPUT/
OUTPUT
I/O3
CONTROL
PORTS
I/O4
WRITE pulse
I/O5
READ pulse
I/O6
I/O7
NOTE: ALL I/Os ARE SET TO INPUTS AT RESET
Figure 2. Block diagram
SW00793
Input Port
Q7
Polarity Inversion
Q7
Configuration
Q7
Output Port
Q7
Q6
Q6
Q6
Q6
Q5
Q5
Q5
Q5
I2C/SMBus
Interface
Q4
Q4
Q4
Q4
logic
Q3
Q3
Q3
Q3
Q2
Q2
Q2
Q2
Q1
Q1
Q1
Q1
Q0
Q0
Q0
Q0
1.1 KΩ
I/O0
6
I/O1
7
I/O2
9
I/O3
10
I/O4
11
I/O5
12
I/O6
13
I/O7
14
Figure 3. System diagram
SW00794
2002 Mar 28
3
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