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PCA9555PWR Datasheet(PDF) 5 Page - Texas Instruments

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Part # PCA9555PWR
Description  REMOTE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCA9555PWR Datasheet(HTML) 5 Page - Texas Instruments

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VCC
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
100 kW
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
I/O Port
PCA9555
www.ti.com ......................................................................................................................................................... SCPS131E – AUGUST 2005 – REVISED MAY 2008
SIMPLIFIED SCHEMATIC OF P-PORT I/Os(1)
(1)
At power-on reset, all registers return to default values.
When an I/O is configured as an input, FETs Q1 and Q2 are off, creating a high-impedance input. The input
voltage may be raised above VCC to a maximum of 5.5 V.
If the I/O is configured as an output, Q1 or Q2 is enabled, depending on the state of the Output Port register. In
this case, there are low-impedance paths between the I/O pin and either VCC or GND. The external voltage
applied to this I/O pin should not exceed the recommended levels for proper operation.
Copyright © 2005–2008, Texas Instruments Incorporated
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