Overview
The PCA9574PW,112, produced by NXP USA Inc., is a CMOS device designed to provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion. This component is particularly suited for low voltage processor and handheld battery-powered mobile applications. It enhances the NXP family of I2C-bus I/O expanders with features such as lower supply current, lower operating voltage, and dual and separate supply rails for voltage level translation. The device supports a 400 kHz I2C-bus serial interface and is compliant with the I2C-bus Standard-mode (100 kHz).
Key Specifications
| Specification | Details |
|---|---|
| Operating Voltage | 1.1 V to 3.6 V |
| Supply Current | < 1 μA in standby |
| I2C-bus Frequency | 400 kHz |
| Number of I/O Pins | 8 configurable I/O pins |
| Output Characteristics | Totem pole: 1 mA source, 3 mA sink; Independently programmable 100 kΩ pull-up or pull-down |
| Interrupt Output | Open-drain active LOW interrupt (INT) output pin |
| Packages | TSSOP16 and HVQFN16 |
| Temperature Range | -40 °C to +85 °C |
Key Features
- 400 kHz I2C-bus serial interface and compliance with I2C-bus Standard-mode (100 kHz)
- Separate supply rails for core logic and I/O bank, allowing voltage level shifting between 1.1 V and 3.6 V
- Very low standby current: < 1 μA
- 8 configurable I/O pins that default to inputs at power-up
- Independently programmable 100 kΩ pull-up or pull-down for each I/O pin
- Open-drain active LOW interrupt (INT) output pin for monitoring logic level changes of pins programmed as inputs
Applications
- Battery-powered mobile applications
- Clamshell devices
- Interfacing to sensors, push buttons, and keypads
- Low voltage processor systems
- Handheld devices requiring additional I/Os with minimal interconnections
Q & A
- What is the PCA9574PW,112 used for?
The PCA9574PW,112 is used for providing 8 bits of General Purpose parallel Input/Output (GPIO) expansion in low voltage processor and handheld battery-powered mobile applications.
- What is the operating voltage range of the PCA9574PW,112?
The operating voltage range is from 1.1 V to 3.6 V.
- What is the I2C-bus frequency supported by the PCA9574PW,112?
The device supports a 400 kHz I2C-bus frequency.
- How many configurable I/O pins does the PCA9574PW,112 have?
The device has 8 configurable I/O pins.
- What is the standby current of the PCA9574PW,112?
The standby current is less than 1 μA.
- What types of packages are available for the PCA9574PW,112?
The device is available in TSSOP16 and HVQFN16 packages.
- What is the temperature range specified for the PCA9574PW,112?
The temperature range is from -40 °C to +85 °C.
- Can the I/O pins be configured independently?
Yes, any of the eight I/O ports can be configured as an input or output independent of each other.
- Does the PCA9574PW,112 support interrupt functionality?
Yes, it has an open-drain active LOW interrupt (INT) output pin for monitoring logic level changes of pins programmed as inputs.
- What are some common applications of the PCA9574PW,112?
Common applications include battery-powered mobile devices, clamshell devices, and interfacing to sensors, push buttons, and keypads.
