Overview
The PCA9539BSHP, produced by NXP USA Inc., is a 24-pin CMOS device designed to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion. This device is part of the I2C-bus/SMBus family of I/O expanders, enhancing the capabilities of microcontrollers by adding additional I/O ports. It is particularly useful in applications where more I/O is needed for devices such as ACPI power switches, sensors, push buttons, LEDs, and fans.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | HVQFN24 (plastic thermal enhanced very thin quad flat package; no leads; 24 terminals; body 4 × 4 × 0.85 mm) |
| Operating Voltage | 2.3 V to 5.5 V (3.0 V to 5.5 V for certain packages) |
| I/O Expansion | 16 bits of General Purpose parallel Input/Output (GPIO) |
| Interface | I2C-bus/SMBus |
| Interrupt Output | Open-drain active-low interrupt output |
| Reset | RESET pin for system reset and power-on reset |
| Temperature Range | -40°C to +85°C |
| Standby Current | 1 μA max |
| I/O Configuration | Input or output selection via I/O configuration bits |
| Polarity Inversion | Active-high or active-low operation via Polarity Inversion register |
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
- Low standby-current consumption of 1 μA max
- Open-drain active-low interrupt output to indicate input state changes
- RESET pin for system reset and power-on reset
- Input or output selection via I/O configuration bits
- Polarity inversion (active-high or active-low operation) via Polarity Inversion register
Applications
- ACPI power switches
- Sensors
- Push buttons
- LEDs
- Fans
- General-purpose remote I/O expansion for microcontrollers
Q & A
- What is the PCA9539BSHP used for?
The PCA9539BSHP is used to provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for microcontrollers via the I2C-bus/SMBus interface.
- What is the operating voltage range of the PCA9539BSHP?
The operating voltage range is 2.3 V to 5.5 V, with specific packages operating between 3.0 V to 5.5 V.
- What type of interrupt output does the PCA9539BSHP have?
The PCA9539BSHP has an open-drain active-low interrupt output.
- How is the reset function implemented in the PCA9539BSHP?
The device has a RESET pin that can be used for system reset and power-on reset.
- What is the temperature range for the PCA9539BSHP?
The temperature range is -40°C to +85°C.
- Can the I/Os be configured as inputs or outputs?
Yes, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits.
- What is the standby current consumption of the PCA9539BSHP?
The standby current consumption is 1 μA max.
- Can the polarity of the input ports be inverted?
Yes, the polarity of the input ports can be inverted using the Polarity Inversion register.
- What types of packages are available for the PCA9539BSHP?
The PCA9539BSHP is available in HVQFN24 packages among others.
- What are some common applications of the PCA9539BSHP?
Common applications include ACPI power switches, sensors, push buttons, LEDs, and fans.
