Overview
The PCA9555APW,118 is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander designed by NXP USA Inc. for I²C-bus/SMBus applications. This device provides a simple solution for expanding the number of I/O ports in a system while minimizing interconnections. It is particularly useful in applications such as ACPI power switches, sensors, push buttons, LEDs, and fan control.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| VDD Range | 1.65 V to 5.5 V | Operating voltage range |
| I²C-Bus Frequency | Up to 400 kHz | Maximum frequency for I²C-bus operations |
| Number of GPIOs | 16 bits | Total number of General Purpose Input/Output ports |
| Interrupt Capability | Yes | Generates interrupt on rising or falling edge of port inputs |
| Pull-Up Resistors | Weak pull-up resistors | Available on I/O ports |
| Package Options | TSSOP24, HWQFN24 | Available package types |
| ESD Protection | 2000 V Human Body Model, 1000 V Charged-Device Model | Electrostatic discharge protection levels |
| Latch-Up Performance | Exceeds 100 mA per JESD78, Class II | Latch-up performance according to JESD78 standards |
Key Features
- Low-Voltage Operation: Operates within a wide VDD range of 1.65 V to 5.5 V, making it compatible with next-generation microprocessors and microcontrollers.
- Interrupt Capability: Generates interrupts on rising or falling edges of the port inputs, enhancing real-time response in applications.
- Weak Pull-Up Resistors: Includes weak pull-up resistors on the I/O ports, simplifying circuit design.
- High ESD Protection: Offers robust electrostatic discharge protection, ensuring device reliability.
- Multiple Package Options: Available in TSSOP24 and HWQFN24 packages, providing flexibility in board design.
Applications
- ACPI Power Switches: Used in power management systems to control power states.
- Sensors and Push Buttons: Expands I/O capabilities for sensor and button interfaces.
- LED Control: Manages LED indicators and other output devices.
- Fan Control: Controls fan speed and status in various electronic systems.
- General Purpose I/O Expansion: Adds additional I/O ports to microcontrollers and microprocessors.
Q & A
- What is the PCA9555APW,118 used for?
The PCA9555APW,118 is used as a 16-bit General Purpose Input/Output (GPIO) expander for I²C-bus/SMBus applications, providing additional I/O ports to a system.
- What is the operating voltage range of the PCA9555APW,118?
The operating voltage range is from 1.65 V to 5.5 V.
- What types of packages are available for the PCA9555APW,118?
The device is available in TSSOP24 and HWQFN24 packages.
- Does the PCA9555APW,118 have interrupt capability?
Yes, it generates interrupts on rising or falling edges of the port inputs.
- What level of ESD protection does the PCA9555APW,118 offer?
The device offers 2000 V Human Body Model and 1000 V Charged-Device Model ESD protection.
- What is the maximum I²C-bus frequency supported by the PCA9555APW,118?
The maximum I²C-bus frequency is up to 400 kHz.
- Does the PCA9555APW,118 include pull-up resistors?
Yes, it includes weak pull-up resistors on the I/O ports.
- What are some common applications of the PCA9555APW,118?
Common applications include ACPI power switches, sensors, push buttons, LED control, and fan control.
- How does the PCA9555APW,118 handle power-on reset?
The device initializes its registers and I²C-bus/SMBus state machine to their default states after power-on reset when VDD reaches VPOR.
- What is the latch-up performance of the PCA9555APW,118?
The latch-up performance exceeds 100 mA per JESD78, Class II.
