Overview
The PCA9555PW/DG,118, produced by NXP USA Inc., is a 24-pin CMOS device 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 options.
The PCA9555 is particularly useful in scenarios where additional I/Os are needed, such as for ACPI power switches, sensors, push buttons, LEDs, and fan control. It features an open-drain interrupt output that indicates changes in the input state, and it supports up to eight devices sharing the same I²C-bus/SMBus through configurable address pins.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Power Supply Voltage | 2.3 V to 5.5 V |
| I/O Configuration | 16 bits, configurable as inputs or outputs |
| I²C-bus Speed | 400 kHz Fast-mode |
| Interrupt Output | Open-drain active LOW |
| Package Options | SO24, SSOP24, TSSOP24, HVQFN24, HWQFN24 |
| Temperature Range | -40 °C to +85 °C |
| Standby Current | 1 µA (maximum) |
| I/O Drive Capability | 25 mA maximum |
| ESD Protection | HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V |
Key Features
- Provides 16 bits of GPIO expansion for I²C-bus/SMBus applications.
- Individual I/O configuration as inputs or outputs.
- Polarity inversion register for inverting the polarity of the input register.
- Open-drain interrupt output indicating changes in input state.
- 5 V tolerant I/Os and Schmitt-trigger action on SCL and SDA inputs for better noise immunity.
- Low standby current consumption of 1 µA (maximum).
- Latch-up performance exceeds 100 mA per JESD78, Class II.
- No glitch on power-up and internal power-on reset.
Applications
- ACPI power switches.
- Sensors and monitoring systems.
- Push buttons and user interfaces.
- LED and display control.
- Fan control and other motor control applications.
- General-purpose I/O expansion in embedded systems.
Q & A
- What is the PCA9555PW/DG,118 used for?
The PCA9555PW/DG,118 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/DG,118?
The operating voltage range is from 2.3 V to 5.5 V.
- How many devices can share the same I²C-bus/SMBus with the PCA9555PW/DG,118?
Up to eight devices can share the same I²C-bus/SMBus using the configurable address pins.
- What is the purpose of the interrupt output on the PCA9555PW/DG,118?
The interrupt output is an open-drain active LOW output that indicates changes in the input state.
- What are the package options available for the PCA9555PW/DG,118?
The package options include SO24, SSOP24, TSSOP24, HVQFN24, and HWQFN24.
- What is the temperature range for the PCA9555PW/DG,118?
The temperature range is from -40 °C to +85 °C.
- How much standby current does the PCA9555PW/DG,118 consume?
The standby current consumption is 1 µA (maximum).
- Does the PCA9555PW/DG,118 have ESD protection?
- Can the PCA9555PW/DG,118 drive LEDs directly?
- What is the I²C-bus speed supported by the PCA9555PW/DG,118?
