Overview
The TCA9554PWR, manufactured by Texas Instruments, is an 8-bit I2C/SMBus I/O expander designed to provide additional general-purpose input/output (I/O) expansion for systems using the two-line bidirectional I2C bus or SMBus protocol. This device operates over a wide power supply voltage range of 1.65 V to 5.5 V, making it versatile for various applications. It supports both Standard-mode (100 kHz) and Fast-mode (400 kHz) clock frequencies, ensuring compatibility with different system requirements.
The TCA9554PWR is particularly useful in scenarios where additional I/Os are needed for devices such as switches, sensors, push-buttons, LEDs, and fans. Its compact 16-pin package (available in TSSOP, SSOP, and SOIC) and low power consumption make it an efficient solution for expanding I/O capabilities.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 1.65 | 5.5 | V | |
| Operating Temperature (TA) | -40 | 85 | °C | |
| I2C Clock Frequency | 100 kHz | 400 kHz | ||
| Low-Level Output Current (IOL) | 25 mA | |||
| High-Level Output Current (IOH) | -10 mA | |||
| Continuous Current through GND | 200 mA | |||
| Junction-to-Ambient Thermal Resistance (RθJA) | 122 °C/W (TSSOP) |
Key Features
- Interrupt Capability: Generates an interrupt on the INT pin whenever an input port changes state.
- Hardware Addressable: A0, A1, and A2 address pins allow up to eight TCA9554 devices on the same I2C bus.
- Power-On Reset: The device can be reset to its default state by cycling the power supply.
- Low Power Consumption: Low standby current consumption, making it suitable for power-sensitive applications.
- ESD Protection: Exceeds JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model.
- Multiple Package Options: Available in TSSOP, SSOP, and SOIC packages.
Applications
- Servers and Routers: Ideal for telecom switching equipment and server applications where additional I/Os are required.
- Personal Computers and Electronics: Suitable for personal computers, gaming consoles, and other personal electronics.
- Industrial Automation: Used in industrial automation systems where I/O expansion is necessary.
- Products with GPIO-Limited Processors: Provides additional I/O capabilities for processors with limited GPIO pins.
Q & A
- What is the operating voltage range of the TCA9554PWR?
The TCA9554PWR operates over a power supply voltage range of 1.65 V to 5.5 V.
- What are the supported I2C clock frequencies?
The device supports both 100 kHz (Standard-mode) and 400 kHz (Fast-mode) clock frequencies.
- How many TCA9554 devices can be connected on the same I2C bus?
Up to eight TCA9554 devices can be connected on the same I2C bus using the A0, A1, and A2 address pins.
- What is the purpose of the INT pin?
The INT pin generates an interrupt whenever an input port changes state.
- How can the device be reset to its default state?
The device can be reset by cycling the power supply and causing a power-on reset.
- What are the package options available for the TCA9554PWR?
The device is available in TSSOP, SSOP, and SOIC packages.
- What is the maximum low-level output current (IOL) of the TCA9554PWR?
The maximum low-level output current (IOL) is 25 mA.
- What is the junction-to-ambient thermal resistance (RθJA) for the TSSOP package?
The junction-to-ambient thermal resistance (RθJA) for the TSSOP package is 122 °C/W.
- Does the TCA9554PWR have ESD protection?
Yes, it exceeds JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model.
- In what types of applications is the TCA9554PWR commonly used?
It is commonly used in servers, routers, personal computers, industrial automation, and products with GPIO-limited processors.
