Overview
The PCA9554ADGVR is an 8-bit I2C and SMBus I/O expander manufactured by Texas Instruments. This component 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, making it versatile for various applications. The device features an open-drain active-low interrupt output, which allows it to inform the microcontroller of changes in input states without continuous I2C bus communication.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Power-Supply Voltage | Range | 2.3 V to 5.5 V |
| I2C Bus Frequency | Maximum | 400 kHz |
| I/O Configuration | Input/Output Selection | Configurable via I2C |
| Interrupt Output | Type | Open-Drain Active-Low |
| Addressing | Hardware Address Pins | Three pins (A0, A1, A2) allowing up to eight devices on the same I2C/SMBus |
| Output Drive Capability | Maximum Current per I/O | 25 mA |
| ESD Protection | Human-Body Model | 2000 V |
| Package Type | TSSOP (DGV) | 16 pins, 3.60 mm × 4.40 mm |
| Operating Temperature | Range | -40°C to 85°C |
Key Features
- I2C to Parallel Port Expander: Expands the I/O capabilities of microcontrollers via the I2C interface.
- Open-Drain Active-Low Interrupt Output: Allows the device to signal changes in input states to the microcontroller.
- 5-V Tolerant I/Os: Compatible with 5V logic levels.
- High-Current Drive Capability: Outputs can directly drive LEDs with low current consumption.
- Input/Output Configuration Register: Allows configuration of I/Os as inputs or outputs via I2C.
- Polarity Inversion Register: Enables inversion of the polarity of the input port register.
- Internal Power-On Reset: Initializes the device to default states upon power-up.
- ESD Protection: Exceeds JESD 22 standards for human-body, machine, and charged-device models.
Applications
- Microcontroller Expansion: Expands the I/O capabilities of microcontrollers in various embedded systems.
- LED Driving: Directly drives LEDs due to its high-current drive capability.
- Industrial Automation: Used in industrial control systems where remote I/O expansion is necessary.
- Consumer Electronics: Found in consumer devices requiring additional I/O ports, such as smart home devices and appliances.
Q & A
- What is the operating voltage range of the PCA9554ADGVR?
The operating voltage range is 2.3 V to 5.5 V.
- What is the maximum frequency of the I2C bus for the PCA9554ADGVR?
The maximum I2C bus frequency is 400 kHz.
- How many devices can share the same I2C/SMBus using the PCA9554ADGVR?
Up to eight devices can share the same I2C/SMBus using the three hardware address pins (A0, A1, A2).
- What is the purpose of the interrupt output on the PCA9554ADGVR?
The interrupt output signals the microcontroller when there is a change in the input states without continuous I2C bus communication.
- Can the PCA9554ADGVR directly drive LEDs?
- What type of ESD protection does the PCA9554ADGVR have?
The device exceeds JESD 22 standards for human-body, machine, and charged-device models.
- What is the package type and size of the PCA9554ADGVR?
The package type is TSSOP (DGV) with a size of 3.60 mm × 4.40 mm.
- Is the PCA9554ADGVR compatible with other Texas Instruments devices?
The PCA9554ADGVR is pin-to-pin and I2C address compatible with the PCF8574, though software changes may be required due to enhancements.
- What is the operating temperature range of the PCA9554ADGVR?
The operating temperature range is -40°C to 85°C.
- How does the PCA9554ADGVR handle power-on reset?
The device has an internal power-on reset that initializes the registers and I2C/SMBus state machine to their default states upon power-up.
