Overview
The PCA9574BS,118, produced by NXP USA Inc., is a CMOS device designed to provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion. This device 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 supply rails for voltage level translation. The PCA9574 is available in TSSOP16 and HVQFN16 packages and operates over the -40 °C to +85 °C industrial temperature range.
Key Specifications
| Specification | Value |
|---|---|
| Interface Type | I2C, Serial, SMBus |
| Operating Voltage | 1.1 V to 3.6 V |
| Clock Frequency | 400 kHz |
| Number of I/O Pins | 8 |
| Package Type | NVQFN-16, TSSOP16 |
| Temperature Range | -40 °C to +85 °C |
| Standby Current | < 1 μA |
| Output Current | 1 mA source, 3 mA sink |
| Pull-up/Pull-down Resistance | 100 kΩ |
Key Features
- Compliant with I2C-bus Standard-mode (100 kHz) and Fast-mode (400 kHz)
- Separate supply rails for core logic and I/O bank, allowing voltage level shifting
- 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
- Bus-hold with programmable on-chip pull-up or pull-down feature for I/Os
- Polarity inversion register for active HIGH or active LOW operation
Applications
The PCA9574BS,118 is ideal for various applications, including battery-powered mobile devices, clamshell devices, and mixed signal environments. It is particularly useful for interfacing to sensors, push buttons, keypads, and other I/O devices operating at different voltage levels. The device simplifies the interconnection of a processor running at one voltage level to I/O devices operating at a different voltage level, making it versatile for a wide range of electronic systems.
Q & A
- What is the PCA9574BS,118 used for? The PCA9574BS,118 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 are the operating voltage ranges for the PCA9574BS,118? The device operates in the voltage range of 1.1 V to 3.6 V.
- What is the clock frequency of the PCA9574BS,118? The clock frequency is 400 kHz.
- How many I/O pins does the PCA9574BS,118 have? The device has 8 configurable I/O pins.
- What are the package types available for the PCA9574BS,118? The device is available in NVQFN-16 and TSSOP16 packages.
- What is the temperature range for the PCA9574BS,118? The device operates over the -40 °C to +85 °C industrial temperature range.
- What is the standby current of the PCA9574BS,118? The standby current is less than 1 μA.
- Does the PCA9574BS,118 support voltage level translation? Yes, it supports voltage level translation between 1.1 V and 3.6 V.
- What is the purpose of the interrupt (INT) output pin? The interrupt (INT) output pin allows monitoring of logic level changes of pins programmed as inputs.
- Can the pull-up/pull-down resistances be programmed for each I/O pin? Yes, each I/O pin can be independently programmed with 100 kΩ pull-up or pull-down resistances.
