Overview
The PCA9554PWR is an 8-bit I2C/SMBus I/O expander produced by Texas Instruments. This device is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It operates within a power-supply voltage range of 2.3 V to 5.5 V and is packaged in a TSSOP-16 format. The PCA9554PWR features an open-drain active-low interrupt output, high-current drive capability for directly driving LEDs, and low current consumption. It is pin-to-pin and I2C address compatible with the PCF8574, although software changes are necessary due to the enhancements in the PCA9554.
Key Specifications
| Specification | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package Type | TSSOP-16 |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Interface | I2C, SMBus |
| I2C Bus Frequency | 400 kHz |
| High-Level Output Current | -10 mA |
| Low-Level Output Current | 25 mA |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
Key Features
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- 5-V Tolerant I/Os
- Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
- 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
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
Applications
The PCA9554PWR is suitable for various applications requiring remote I/O expansion, such as:
- Industrial Control Systems
- Automotive Systems
- Consumer Electronics
- Medical Devices
- Any system needing to expand the I/O capabilities of a microcontroller via an I2C or SMBus interface
Q & A
- What is the operating voltage range of the PCA9554PWR?
The PCA9554PWR operates within a power-supply voltage range of 2.3 V to 5.5 V.
- What type of package does the PCA9554PWR come in?
The PCA9554PWR is packaged in a TSSOP-16 format.
- What is the maximum I2C bus frequency supported by the PCA9554PWR?
The PCA9554PWR supports an I2C bus frequency of up to 400 kHz.
- Does the PCA9554PWR have ESD protection?
Yes, the PCA9554PWR has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.[
- How many devices can be connected on the same I2C/SMBus?
Up to eight PCA9554 devices (or 16 devices including PCA9554A) can be connected on the same I2C/SMBus using the three hardware address pins.[
- What is the purpose of the interrupt output on the PCA9554PWR?
The interrupt output is used to inform the microcontroller of changes in the input state without needing continuous communication via the I2C bus.[
- Is the PCA9554PWR compatible with other Texas Instruments devices?
The PCA9554PWR is pin-to-pin and I2C address compatible with the PCF8574, although software changes are required due to enhancements.[
- What is the typical operating temperature range for the PCA9554PWR?
The PCA9554PWR operates within a temperature range of -40°C to 85°C.
- Does the PCA9554PWR support 5-V tolerant I/Os?
Yes, the PCA9554PWR supports 5-V tolerant I/Os.[
- What is the high-current drive capability of the PCA9554PWR's outputs?
The outputs of the PCA9554PWR have high-current drive capability for directly driving LEDs and low current consumption.[
- How are the I/Os configured at power-up?
At power-up, the I/Os are configured as inputs with a weak pull-up to VCC.[
