Overview
The PCA9539DBR, 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 supply voltage range of 2.3 V to 5.5 V, making it versatile for various applications. The PCA9539DBR features low standby current consumption, an open-drain active-low interrupt output, and the ability to configure I/Os as either inputs or outputs. This component is particularly useful in scenarios where additional I/O ports are needed without increasing the complexity of the system.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.3 to 5.5 | V |
| Operating Free-Air Temperature | -40 to 85 | °C |
| Standby Current Consumption | 1 | μA |
| High-Level Output Current | -10 | mA |
| Low-Level Output Current | 25 | mA |
| I2C Clock Frequency | 0 Hz to 400 kHz | |
| ESD Protection | 2000 V HBM, 1000 V CDM | |
| Package Types | SSOP, TVSOP, SOIC, TSSOP, VQFN |
Key Features
- 16-bit I2C and SMBus low-power I/O expander
- Low standby current consumption of 1 μA max
- Open-drain active-low interrupt output
- Configuration, Input, Output, and Polarity Inversion registers
- I/Os default to inputs at power-on and can be configured as inputs or outputs
- 5 V tolerant I/Os
- Noise filter on SCL/SDA inputs
- No glitch on power-up
- Internal power-on reset
- Two hardware pins (A0, A1) for varying the fixed I2C address, allowing up to four devices to share the same I2C bus/SMBus
Applications
- ACPI power switches
- Sensors
- Push buttons
- LEDs
- Fans
- General-purpose I/O expansion for microcontrollers
Q & A
- What is the PCA9539DBR used for?
The PCA9539DBR is used for providing 16-bit I2C and SMBus low-power I/O expansion for microcontrollers.
- What is the operating voltage range of the PCA9539DBR?
The operating voltage range is 2.3 V to 5.5 V.
- What is the standby current consumption of the PCA9539DBR?
The standby current consumption is 1 μA max.
- How are the I/Os configured at power-on?
The I/Os default to inputs at power-on.
- 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/SMBus using the PCA9539DBR?
Up to four devices can share the same I2C bus/SMBus using the two hardware pins (A0, A1) to vary the fixed I2C address.
- What types of packages are available for the PCA9539DBR?
The PCA9539DBR is available in SSOP, TVSOP, SOIC, TSSOP, and VQFN packages.
- What is the ESD protection level of the PCA9539DBR?
The ESD protection exceeds 2000 V HBM and 1000 V CDM.
- What is the clock frequency range for the I2C interface?
The clock frequency range is from 0 Hz to 400 kHz.
- Does the PCA9539DBR have internal power-on reset?
Yes, the PCA9539DBR has an internal power-on reset.
