Overview
The PCA9539PWRG4, produced by Texas Instruments, is a 16-bit I²C-bus General Purpose Input/Output (GPIO) expander designed for a wide range of applications requiring additional I/O ports. This device is part of the PCA9539 series and is packaged in a 24-pin TSSOP (Thin Shrink Small Outline Package) or QFN (Quad Flat No-Lead) package. It is optimized for use in I²C-bus and SMBus applications, providing a simple and efficient solution for expanding the I/O capabilities of microcontrollers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power Supply Voltage Range | 2.3 - 5.5 | V |
| I/O Configuration | 16 bits (2 x 8-bit ports) | |
| Interrupt Output | Open-drain active LOW | |
| Reset Input | Active LOW | |
| I²C-bus Frequency | Up to 400 kHz (Fast-mode) | |
| Standby Current Consumption | 1 µA (maximum) | |
| Output Drive Capability | 25 mA (maximum) | |
| ESD Protection | HBM: 2000 V, CDM: 1000 V | |
| Operating Temperature Range | -40°C to +85°C | |
| Package Type | TSSOP24 or QFN |
Key Features
- 16-bit I²C-bus GPIO with interrupt and reset capabilities.
- Operating power supply voltage range of 2.3 V to 5.5 V.
- 5 V tolerant I/Os.
- Ultra-low standby current consumption of 1 µA (maximum).
- Schmitt-trigger action on SCL and SDA inputs for better noise immunity.
- No glitch on power-up.
- Latched outputs with 25 mA drive capability for directly driving LEDs.
- Open-drain active LOW interrupt output (INT) for indicating input state changes.
- Reset input (RESET) for resetting the device to default values without power cycling.
- Two address pins (A0, A1) allowing up to four devices to share the same I²C-bus/SMBus.
Applications
- ACPI power switches.
- Sensors and monitoring systems.
- Push buttons and user interfaces.
- LED and display control.
- Fan control and other motor control applications.
- Expanding I/O capabilities of microcontrollers in various embedded systems.
Q & A
- What is the PCA9539PWRG4 used for?
The PCA9539PWRG4 is used as a 16-bit I²C-bus GPIO expander to provide additional I/O ports for microcontrollers in various applications.
- What is the operating voltage range of the PCA9539PWRG4?
The operating voltage range is from 2.3 V to 5.5 V.
- What type of interrupt output does the PCA9539PWRG4 have?
The PCA9539PWRG4 has an open-drain active LOW interrupt output.
- How many devices can share the same I²C-bus/SMBus using the PCA9539PWRG4?
Up to four devices can share the same I²C-bus/SMBus using the address pins A0 and A1.
- What is the maximum output drive capability of the PCA9539PWRG4?
The maximum output drive capability is 25 mA.
- What is the standby current consumption of the PCA9539PWRG4?
The standby current consumption is 1 µA (maximum).
- What type of ESD protection does the PCA9539PWRG4 have?
The PCA9539PWRG4 has HBM (Human Body Model) ESD protection exceeding 2000 V and CDM (Charged Device Model) ESD protection exceeding 1000 V.
- What is the operating temperature range of the PCA9539PWRG4?
The operating temperature range is from -40°C to +85°C.
- What package types are available for the PCA9539PWRG4?
The PCA9539PWRG4 is available in TSSOP24 and QFN packages.
- How does the reset function work on the PCA9539PWRG4?
The reset function can be initiated via the RESET pin, which sets the device to its default state without requiring a power cycle.
