Overview
The PCA9539PWRE4, produced by Texas Instruments, is a 24-pin CMOS device designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion. This device is part of the I²C-bus/SMBus family of I/O expanders and is developed to enhance the capabilities of microcontrollers by adding additional I/Os. It is particularly useful in applications where more I/O pins are required for devices such as ACPI power switches, sensors, push buttons, LEDs, and fans.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power Supply Voltage | 2.3 - 5.5 | V |
| I²C-bus Clock Frequency | 0 Hz to 400 kHz | |
| Number of I/O Pins | 16 | |
| Default State of I/O Pins at Power-Up | Inputs | |
| Interrupt Output Type | Open-drain Active-Low | |
| Reset Input Type | Active-Low | |
| Standby Current Consumption | 1 µA (maximum) | |
| Package Type | TSSOP24 | |
| Operating Temperature Range | -40 °C to +85 °C | |
| ESD Protection | HBM: 2000 V, CDM: 1000 V |
Key Features
- 16-bit I²C-bus and SMBus low power I/O port with interrupt and reset capabilities.
- Polarity inversion register to invert the polarity of the read register.
- Open-drain active LOW interrupt output activated when any input state changes.
- Active LOW reset input to reset the device to its default state without power cycling.
- Low standby current consumption of up to 1 µA.
- Noise filter on SCL/SDA inputs for better switching noise immunity.
- No glitch on power-up to ensure stable operation.
- Internal power-on reset to initialize the device state machine and registers.
- 5 V tolerant I/Os for compatibility with various voltage levels.
- Latched outputs with 25 mA drive capability for directly driving LEDs.
- ESD protection exceeding 2000 V HBM and 1000 V CDM.
Applications
- ACPI power switches
- Sensors
- Push buttons
- LEDs and LED drivers
- Fan control
- Other applications requiring additional I/O expansion
Q & A
- What is the PCA9539PWRE4 used for?
The PCA9539PWRE4 is used to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications.
- What is the operating voltage range of the PCA9539PWRE4?
The operating voltage range is from 2.3 V to 5.5 V.
- How many I/O pins does the PCA9539PWRE4 have?
The device has 16 I/O pins.
- What is the default state of the I/O pins at power-up?
The I/O pins default to inputs at power-up.
- What type of interrupt output does the PCA9539PWRE4 have?
The device has an open-drain active LOW interrupt output.
- How does the reset input work?
The reset input is active LOW and can reset the device to its default state without power cycling.
- What is the standby current consumption of the PCA9539PWRE4?
The standby current consumption is up to 1 µA.
- What is the maximum clock frequency supported by the PCA9539PWRE4?
The device supports clock frequencies up to 400 kHz.
- What type of package is the PCA9539PWRE4 available in?
The device is available in a TSSOP24 package.
- What is the operating temperature range of the PCA9539PWRE4?
The operating temperature range is from -40 °C to +85 °C.
- What level of ESD protection does the PCA9539PWRE4 offer?
The device offers ESD protection exceeding 2000 V HBM and 1000 V CDM.
