Overview
The PCA9539PWG4, produced by Texas Instruments, is a 16-bit I2C and SMBus low-power I/O expander. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It operates within a voltage range of 2.3-V to 5.5-V and is available in various package types, including TSSOP, SSOP, TVSOP, SOIC, and VQFN. The PCA9539PWG4 is particularly notable for its low standby-current consumption and high-current drive capability, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2.3 to 5.5 | V |
| Standby Current Consumption | 1 | μA |
| Operating Temperature Range | -40 to 85 | °C |
| High-Level Output Current | -10 | mA |
| Low-Level Output Current | 25 | mA |
| Package Types | TSSOP, SSOP, TVSOP, SOIC, VQFN | |
| Address Pins | A0, A1 | |
| Interrupt Output | Open-drain active-low |
Key Features
- Low standby-current consumption of 1 μA max.
- I2C to parallel port expander with serial clock (SCL) and serial data (SDA) lines.
- Open-drain active-low interrupt output.
- High-current drive capability for directly driving LEDs.
- Configuration, Input Port, Output Port, and Polarity Inversion registers.
- Hardware address pins (A0 and A1) allowing up to four devices to share the same I2C bus or SMBus.
- Reset pin for resetting the device.
Applications
The PCA9539PWG4 is suitable for various applications requiring remote I/O expansion, such as:
- Industrial control systems.
- Consumer electronics.
- Automotive systems.
- Medical devices.
- Any system requiring additional I/O ports with low power consumption.
Q & A
- What is the operating voltage range of the PCA9539PWG4?
The PCA9539PWG4 operates within a voltage range of 2.3-V to 5.5-V.
- What is the standby current consumption of the PCA9539PWG4?
The standby current consumption is 1 μA max.
- What types of packages are available for the PCA9539PWG4?
The device is available in TSSOP, SSOP, TVSOP, SOIC, and VQFN packages.
- How many devices can share the same I2C bus or SMBus?
Up to four devices can share the same I2C bus or SMBus using the hardware address pins (A0 and A1).
- What is the purpose of the interrupt output on the PCA9539PWG4?
The interrupt output is an open-drain active-low signal that can inform the microcontroller of incoming data on its ports without needing to communicate via the I2C bus.
- Can the PCA9539PWG4 drive LEDs directly?
Yes, the device has high-current drive capability for directly driving LEDs.
- What are the configuration options for the I/O ports on the PCA9539PWG4?
The I/O ports can be configured as either inputs or outputs by writing to the I/O configuration bits, and the polarity of the input port can be inverted using the Polarity Inversion register.
- What is the operating temperature range of the PCA9539PWG4?
The operating temperature range is -40°C to 85°C.
- Is the PCA9539PWG4 still in production?
No, the PCA9539PWG4 is no longer manufactured, but substitutes are available.
- Where can I find more detailed technical information about the PCA9539PWG4?
More detailed technical information can be found in the datasheet available on Texas Instruments' website and other electronics distributors like Digi-Key.
