Overview
The PCA9539APW, produced by NXP USA Inc., is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander designed for I²C-bus/SMBus applications. This device provides remote I/O expansion for most microcontroller families, enabling the extension of the number of I/O ports available. It operates within a voltage range of 2.3 V to 5.5 V and features low standby current consumption, making it suitable for a variety of applications requiring low power consumption.
Key Specifications
| Specification | Value |
|---|---|
| Number of I/O Ports | 16 |
| Interface | I²C-bus/SMBus |
| Operating Voltage (VCC) | 2.3 V to 5.5 V |
| Standby Current Consumption | 1 μA max |
| Operating Temperature | -40°C to 85°C |
| Package Types | SSOP (24), TVSOP (24), SOIC (24), TSSOP (24), VQFN (24) |
| I/O Configuration | Input or Output selection via I/O configuration bits |
| Interrupt Output | Open-drain active-low interrupt output |
| Output Drive Capability | High-current drive capability for directly driving LEDs |
| Addressing | Hardware address pins (A0 and A1) for up to four devices on the same I²C bus |
Key Features
- Low standby current consumption of 1 μA max, reducing power consumption when I/Os are held low.
- I²C to Parallel port expander, enabling communication via the I²C interface.
- Open-drain active-low interrupt output, allowing the device to inform the microcontroller of incoming data without continuous I²C bus communication.
- High-current drive capability for directly driving LEDs.
- Programmable polarity inversion for the Input Port register.
- Hardware address pins (A0 and A1) allowing up to four devices to share the same I²C bus or SMBus.
- Integrated electrostatic discharge (ESD) protection on I/O pins.
Applications
- Control Panels and Human-Machine Interfaces (HMIs): Expanding digital inputs and outputs for buttons, switches, and indicators.
- Industrial Automation: Interfacing with sensors, actuators, and other digital devices.
- Sensor Interfaces: Monitoring environmental conditions, detecting proximity, or motion.
- LED Display Control: Controlling LED displays, segment displays, or indicators.
- Keypad Interfaces: Interfacing with numeric keypads or matrix keypads.
- Automotive Electronics: Communicating with external sensors or controlling internal lighting.
- Medical Devices: Connecting various sensors, switches, or display elements.
Q & A
- What is the PCA9539APW used for?
The PCA9539APW is a 16-bit General Purpose Input/Output (GPIO) expander used for remote I/O expansion in I²C-bus/SMBus applications. - What is the operating voltage range of the PCA9539APW?
The operating voltage range is 2.3 V to 5.5 V. - What is the standby current consumption of the PCA9539APW?
The standby current consumption is 1 μA max. - How many I/O ports does the PCA9539APW have?
The device has 16 I/O ports. - What types of packages are available for the PCA9539APW?
The device is available in SSOP (24), TVSOP (24), SOIC (24), TSSOP (24), and VQFN (24) packages. - Can multiple PCA9539APW devices share the same I²C bus?
Yes, up to four devices can share the same I²C bus or SMBus using hardware address pins (A0 and A1). - What is the purpose of the interrupt output on the PCA9539APW?
The interrupt output informs the microcontroller of incoming data without continuous I²C bus communication. - Can the PCA9539APW drive LEDs directly?
Yes, the device has high-current drive capability for directly driving LEDs. - What is the operating temperature range of the PCA9539APW?
The operating temperature range is -40°C to 85°C. - Does the PCA9539APW have ESD protection?
Yes, the device has integrated electrostatic discharge (ESD) protection on I/O pins.
