pca9539 datasheet
Table Of Contents
- 1 Features
- 2 Description
- Table of Contents
- 3 Revision History
- 4 Description (Continued)
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
- 8 Detailed Description
- 9 Application And Implementation
- 10 Power Supply Recommendations
- 11 Device and Documentation Support
- 12 Mechanical, Packaging, and Orderable Information
V
CC
CLK
D Q
FF
Configuration
Register
Data From
Shift Register
Data From
Shift Register
Q
Write Configuration
Pulse
CLK
D Q
FF
Q
Write Pulse
Output Port
Register
Q1
Q2
GND
I/O Pin
Output Port
Register Data
CLK
D Q
FF
Q
Input Port
Register
Read Pulse
CLK
D Q
FF
Q
Polarity Inversion
Register
Write Polarity
Pulse
Input Port
Register Data
Polarity
Register Data
To INT
Data From
Shift Register
PCA9539
www.ti.com
SCPS130G –AUGUST 2005–REVISED JUNE 2014
Functional Block Diagram (continued)
(1) At power-on reset, all registers return to default values.
Figure 18. Simplified Schematic Of P-Port I/Os
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