Overview
The PCA9555PW,112 is a 24-pin CMOS device produced by NXP USA Inc., designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. This device is part of NXP Semiconductors' family of I²C-bus I/O expanders and offers several enhancements such as higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. It is particularly useful for expanding the I/O capabilities in various applications, including ACPI power switches, sensors, push buttons, LEDs, and fans.
Key Specifications
| Specification | Value |
|---|---|
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| I/O Tolerance | 5 V tolerant |
| Number of I/O Pins | 16 |
| Default I/O State at Reset | Inputs |
| Clock Frequency | 0 Hz to 400 kHz |
| Interrupt Output | Active LOW, open-drain |
| ESD Protection | 2000 V HBM, 200 V MM, 1000 V CDM |
| Package Type | TSSOP24 |
| I²C-bus Addressing | Three hardware pins (A0, A1, A2) for address variation, allowing up to eight devices on the same bus |
Key Features
- Operating power supply voltage range of 2.3 V to 5.5 V
- 5 V tolerant I/Os
- Polarity Inversion register for active HIGH or active LOW operation
- Active LOW interrupt output
- Low standby current
- Noise filter on SCL/SDA inputs
- No glitch on power-up
- Internal power-on reset
- Individual I/O configuration
- ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM
Applications
The PCA9555PW,112 is suitable for a variety of applications where additional I/O expansion is required. These include:
- ACPI power switches
- Sensors
- Push buttons
- LEDs
- Fans
- Other general-purpose I/O needs in industrial, automotive, and consumer electronics
Q & A
- What is the PCA9555PW,112 used for?
The PCA9555PW,112 is used for providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications.
- What is the operating voltage range of the PCA9555PW,112?
The operating voltage range is from 2.3 V to 5.5 V.
- How many I/O pins does the PCA9555PW,112 have?
The device has 16 I/O pins.
- What is the default state of the I/O pins at reset?
The I/O pins default to inputs at reset.
- What is the clock frequency range of the PCA9555PW,112?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9555PW,112 have ESD protection?
Yes, it has ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM.
- How many devices can share the same I²C-bus/SMBus?
Up to eight devices can share the same I²C-bus/SMBus using the three hardware address pins (A0, A1, A2).
- What type of interrupt output does the PCA9555PW,112 have?
The device has an active LOW, open-drain interrupt output.
- Does the PCA9555PW,112 have noise filtering on the SCL/SDA inputs?
Yes, it has noise filters on the SCL/SDA inputs.
- Is there any glitch on power-up for the PCA9555PW,112?
No, there is no glitch on power-up.
