Overview
The PCA9554DB112, produced by NXP USA Inc., is a 16-pin CMOS device designed to provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. This device is part of the PCA9554 and PCA9554A series, which are identical except for their fixed I²C addresses, allowing for up to 16 devices to be used on the same I²C/SMBus. The PCA9554DB112 is suitable for various applications requiring remote I/O expansion and is compatible with most microcontroller families via the I²C interface.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SSOP-16 |
| Operating Power-Supply Voltage Range | 2.3 V to 5.5 V |
| I²C Bus Speed | Up to 400 kHz |
| Number of GPIOs | 8 bits |
| Interrupt Output | Open-Drain Active-Low |
| Addressing | Three hardware address pins (A0, A1, A2) allowing up to eight devices on the same I²C/SMBus |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Output Drive Capability | High-current drive for directly driving LEDs |
Key Features
- I²C to parallel port expander
- Open-drain active-low interrupt output
- 5-V tolerant I/Os
- Input/Output configuration register
- Polarity inversion register
- Internal power-on reset
- Power-up with all channels configured as inputs
- No glitch on power-up
- Latched outputs with high-current drive capability for directly driving LEDs
- ESD protection exceeding JESD 22 standards
Applications
The PCA9554DB112 is versatile and can be used in a variety of applications, including:
- Remote I/O expansion for microcontrollers
- Industrial control systems
- Automotive systems requiring I²C/SMBus communication
- Consumer electronics needing GPIO expansion
- Medical devices requiring reliable and low-power I/O expansion
Q & A
- What is the PCA9554DB112 used for?
The PCA9554DB112 is used for providing 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications. - What is the operating voltage range of the PCA9554DB112?
The operating voltage range is from 2.3 V to 5.5 V. - How many devices can be connected on the same I²C/SMBus?
Up to eight devices can be connected on the same I²C/SMBus using the three hardware address pins. - What is the interrupt output type of the PCA9554DB112?
The interrupt output is an open-drain active-low type. - Does the PCA9554DB112 have ESD protection?
Yes, it has ESD protection exceeding JESD 22 standards. - What is the maximum I²C bus speed supported by the PCA9554DB112?
The maximum I²C bus speed supported is up to 400 kHz. - Can the PCA9554DB112 drive LEDs directly?
Yes, it has latched outputs with high-current drive capability for directly driving LEDs. - How are the I/Os configured at power-up?
The I/Os are configured as inputs with a weak pull-up to VCC at power-up. - Can the polarity of the input port be inverted?
Yes, the polarity of the input port can be inverted using the Polarity Inversion register. - Is the PCA9554DB112 compatible with other devices like PCF8574?
Yes, it is pin-to-pin and I²C address compatible with the PCF8574, though software changes may be required due to enhancements.
