Overview
The PCAL9554BBSHP, produced by NXP USA Inc., is a low-voltage 8-bit General Purpose Input/Output (GPIO) expander designed for I2C-bus/SMBus applications. This device is part of the PCAL9554 series, which offers a simple solution for expanding the number of I/Os in various systems while minimizing interconnections. The PCAL9554BBSHP is particularly useful in scenarios where additional I/Os are needed, such as in ACPI power switches, sensors, push buttons, LEDs, and fan control.
Key Specifications
| Specification | Value |
|---|---|
| Device Type | Low-voltage 8-bit GPIO expander |
| Interface | I2C-bus/SMBus, Fast-mode Plus (Fm+) |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Package Types | TSSOP16, HVQFN16 |
| Address Inputs | A0, A1, A2 (hardware selectable) |
| Interrupt Output | Open-drain |
| ESD Protection | 2000 V Human Body Model, 1000 V Charged-Device Model |
| Output Drive Strength | Four programmable drive strengths |
| Output Configuration | Bank selectable push-pull or open-drain output stages |
Key Features
- Agile I/O features including programmable output drive strength, latchable inputs, and programmable pull-up/pull-down resistors.
- Maskable interrupt and interrupt status register for efficient interrupt handling.
- Software backward compatibility with PCA9554 and PCA9554A/B series.
- Pin-to-pin replacement for PCA9554 and PCA9554A/B series with interrupts disabled at power-up.
- Bit-wise I/O programming capabilities.
- Weak pull-up resistors for I2C-bus/SMBus applications.
Applications
- ACPI power switches and sensors.
- Push buttons and LEDs.
- Fan control and other peripheral control in microcontroller-based systems.
- Expansion of I/Os in microcontrollers and microprocessors.
- Low-power I/O port applications requiring flexible configuration.
Q & A
- What is the primary function of the PCAL9554BBSHP?
The PCAL9554BBSHP is a low-voltage 8-bit General Purpose Input/Output (GPIO) expander designed for I2C-bus/SMBus applications.
- What are the available package types for the PCAL9554BBSHP?
The device is available in TSSOP16 and HVQFN16 packages.
- What is the supply voltage range for the PCAL9554BBSHP?
The supply voltage range is from 1.65 V to 5.5 V.
- Does the PCAL9554BBSHP support programmable output drive strength?
Yes, it supports four programmable output drive strengths.
- How does the interrupt handling work on the PCAL9554BBSHP?
The device features maskable interrupts and an interrupt status register for efficient interrupt handling.
- Is the PCAL9554BBSHP backward compatible with other NXP GPIO expanders?
Yes, it is software backward compatible with PCA9554 and PCA9554A/B series.
- What types of output configurations are supported by the PCAL9554BBSHP?
The device supports bank selectable push-pull or open-drain output stages.
- What are some common applications of the PCAL9554BBSHP?
Common applications include ACPI power switches, sensors, push buttons, LEDs, and fan control.
- Does the PCAL9554BBSHP have ESD protection?
Yes, it has 2000 V Human Body Model and 1000 V Charged-Device Model ESD protection.
- How are the device addresses set for the PCAL9554BBSHP?
The device addresses are set using hardware address package pins A0, A1, and A2.
