Overview
The PCA9539PWE4, produced by Texas Instruments, is a 16-bit I/O expander designed for use with the two-line bidirectional I2C bus. This device operates within a voltage range of 2.3 V to 5.5 V and is intended for general-purpose remote I/O expansion for most microcontroller families. It features an I2C interface with serial clock (SCL) and serial data (SDA) lines, enabling communication with the system master. The PCA9539PWE4 is configured as inputs at power-on, but the system master can configure the I/Os as either inputs or outputs by writing to the I/O configuration bits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2.3 V to 5.5 V | V |
| Standby Current Consumption | 1 μA Max | A |
| I2C Bus Speed | 400 kHz | Hz |
| High-Level Output Current | -10 mA | A |
| Low-Level Output Current | 25 mA | A |
| Operating Temperature Range | -40°C to 85°C | °C |
| ESD Protection | 2000 V Human-Body Model, 1000 V Charged-Device Model | V |
| Package Types | SSOP, TVSOP, SOIC, TSSOP, VQFN | - |
Key Features
- Low standby current consumption of 1 μA Max.
- I2C to Parallel port expander.
- Open-drain active-low interrupt output.
- Latched outputs with high-current drive capability for directly driving LEDs.
- 5-V tolerant I/O ports.
- Two hardware address pins (A0 and A1) allowing up to four devices to share the same I2C bus or SMBus.
- Active-low reset input and power-on reset.
- Polarity inversion register for active-high or active-low operation.
- ESD protection exceeding JESD 22 standards.
Applications
The PCA9539PWE4 is suitable for a variety of applications requiring remote I/O expansion, including:
- Industrial automation and control systems.
- Consumer electronics and appliances.
- Medical devices and equipment.
- Automotive systems and infotainment.
- Embedded systems and IoT devices.
Q & A
- What is the operating voltage range of the PCA9539PWE4?
The PCA9539PWE4 operates within a voltage range of 2.3 V to 5.5 V.
- What is the maximum standby current consumption of the PCA9539PWE4?
The maximum standby current consumption is 1 μA.
- What is the speed of the I2C bus supported by the PCA9539PWE4?
The PCA9539PWE4 supports a 400 kHz I2C bus speed.
- Can the PCA9539PWE4 drive LEDs directly?
- How many devices can share the same I2C bus using the PCA9539PWE4?
- What type of ESD protection does the PCA9539PWE4 offer?
- What are the available package types for the PCA9539PWE4?
- How does the PCA9539PWE4 handle power-on and reset conditions?
- Can the polarity of the input ports be inverted on the PCA9539PWE4?
- What is the operating temperature range of the PCA9539PWE4?
