Overview
The PCA9539PWR, produced by Texas Instruments, is a remote 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, making it versatile for various applications. The PCA9539PWR features low standby-current consumption, an open-drain active-low interrupt output, and the ability to configure its I/Os as either inputs or outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Operating Voltage | 2.3 to 5.5 | V |
| Standby Current | 1 | μA |
| Operating Temperature | -40 to 85 | °C |
| I/O Configuration | 16 bits (2 x 8 bits) | |
| Interrupt Output | Open-drain active-low | |
| High-Level Output Current | -10 | mA |
| Low-Level Output Current | 25 | mA |
| Interrupt Valid Time | 4 | μs |
| Output Data Valid Time | 200 (VCC = 2.3 V - 5.5 V), 300 (VCC = 1.65 V - 2.3 V) | ns |
Key Features
- Low standby-current consumption of 1 μA max.
- I2C to parallel port expander.
- Open-drain active-low interrupt output.
- 16-bit I/O expansion (two 8-bit ports).
- Configurable I/Os as inputs or outputs.
- Polarity inversion for input ports (active-high or active-low operation).
- High-current drive capability for directly driving LEDs.
- Two hardware pins (A0 and A1) for programming and varying the fixed I2C address, allowing up to four devices to share the same I2C bus or SMBus.
Applications
- General-purpose remote I/O expansion for microcontroller families.
- Industrial control systems.
- Automotive systems.
- Consumer electronics.
- Medical devices requiring low power consumption and I/O expansion.
Q & A
- What is the operating voltage range of the PCA9539PWR?
The PCA9539PWR operates within a voltage range of 2.3 V to 5.5 V.
- What is the standby current consumption of the PCA9539PWR?
The standby current consumption is 1 μA max.
- How many bits of I/O expansion does the PCA9539PWR provide?
The PCA9539PWR provides 16 bits of I/O expansion (two 8-bit ports).
- Can the I/Os of the PCA9539PWR be configured as inputs or outputs?
- What is the purpose of the open-drain active-low interrupt output?
The open-drain active-low interrupt output is activated when any input state differs from its corresponding Input Port register state, indicating to the system master that an input state has changed.
- How many devices can share the same I2C bus or SMBus using the PCA9539PWR?
Up to four devices can share the same I2C bus or SMBus using the hardware pins A0 and A1 to program and vary the fixed I2C address.
- What is the high-level output current capability of the PCA9539PWR?
The high-level output current capability is -10 mA.
- What is the low-level output current capability of the PCA9539PWR?
The low-level output current capability is 25 mA.
- Can the PCA9539PWR directly drive LEDs?
- What is the typical interrupt valid time for the PCA9539PWR?
The typical interrupt valid time is 4 μs.
