Overview
The TCA9555PWR, produced by Texas Instruments, is a 16-bit I2C/SMBus I/O expander designed for general-purpose remote I/O expansion. It operates within a power supply voltage range of 1.65 V to 5.5 V, making it compatible with most microcontroller families. This device is particularly useful for expanding the I/O capabilities of microcontrollers via the I2C interface.
The TCA9555PWR is identical to the TCA9535, except it includes internal I/O pull-up resistors that pull the I/Os to a default high when configured as inputs and undriven. It features configurable slave addresses using three hardware pins (A0, A1, and A2), allowing up to eight devices to share the same I2C bus or SMBus.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP (PW) - 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Power Supply Voltage Range | 1.65 V to 5.5 V |
| I2C Bus Speed | Up to 400 kHz (Fast-mode) |
| I/O Configuration | Input or Output selection via configuration registers |
| Interrupt Output | Open-drain active-low interrupt output |
| ESD Protection | Exceeds JESD 22, 2000-V Human-Body Model (A114-A), 1000-V Charged-Device Model (C101) |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II |
| Standby Current Consumption | Maximum 3.5 µA |
Key Features
- Low standby-current consumption of 3.5 µA maximum
- I2C to parallel port expander
- Open-drain active-low interrupt output
- 5-V tolerant I/O ports
- Compatible with most microcontrollers
- 400-kHz fast I2C bus
- Configurable slave address with three address pins
- Polarity inversion register
- Latched outputs with high-current drive capability for directly driving LEDs
- Internal I/O pull-up resistors (distinguishes it from TCA9535)
Applications
The TCA9555PWR is suitable for a variety of applications where additional I/O expansion is required. These include:
- Expanding I/O capabilities for microcontrollers
- Switches, sensors, and push-button interfaces
- Driving LEDs and other high-current devices
- Fans and other similar devices
- Industrial automation and control systems
- Consumer electronics requiring I/O expansion
Q & A
- What is the operating voltage range of the TCA9555PWR?
The TCA9555PWR operates within a power supply voltage range of 1.65 V to 5.5 V.
- How many I/O bits does the TCA9555PWR provide?
The TCA9555PWR provides 16 bits of general-purpose I/O expansion.
- What is the maximum I2C bus speed supported by the TCA9555PWR?
The TCA9555PWR supports up to 400 kHz (Fast-mode) I2C bus speed.
- Does the TCA9555PWR have internal pull-up resistors?
- How many devices can share the same I2C bus?
Up to eight TCA9555PWR devices can share the same I2C bus or SMBus using the configurable slave addresses.
- What type of interrupt output does the TCA9555PWR have?
The TCA9555PWR has an open-drain active-low interrupt output.
- What is the standby current consumption of the TCA9555PWR?
The standby current consumption is a maximum of 3.5 µA.
- Does the TCA9555PWR have ESD protection?
- Can the TCA9555PWR drive LEDs directly?
- What is the package type of the TCA9555PWR?
The TCA9555PWR is packaged in a 24-pin TSSOP (PW).
