Overview
The TCA9554ADBQR, produced by Texas Instruments, is an 8-bit I2C/SMBus I/O expander designed to provide additional input/output (I/O) ports for various applications. This device operates within a power supply voltage range of 1.65 V to 5.5 V and supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. It is particularly useful in scenarios where additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and other similar devices.
Key Specifications
| Parameter | Value |
|---|---|
| Number of I/O Bits | 8 |
| Power Supply Voltage Range | 1.65 V to 5.5 V |
| I2C/SMBus Clock Frequencies | 100 kHz (Standard-mode), 400 kHz (Fast-mode) |
| Package Type | 16-pin SSOP |
| Address Pins | A0, A1, A2 (allow up to eight devices on the same I2C bus) |
| Interrupt Output | Open-drain active-low interrupt on INT pin |
| I/O Port Configuration | Input and Output Configuration Register, Polarity Inversion Register |
| Reset | Internal Power-On Reset, reset by cycling power supply |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model |
Key Features
- Provides 8 bits of general purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol.
- Operating power-supply voltage range of 1.65 V to 5.5 V.
- 5-V tolerant I/O ports.
- Open-drain active-low interrupt output on the INT pin whenever an input port changes state.
- Three hardware selectable address pins (A0, A1, A2) allowing up to eight devices on the same I2C/SMBus.
- Input and Output Configuration Register and Polarity Inversion Register.
- Internal Power-On Reset and reset by cycling the power supply.
- Low standby current consumption and no glitch on power up.
- Noise filter on SCL/SDA inputs.
- Latched outputs with high-current drive capability for directly driving LEDs.
- ESD protection exceeding JESD 22 standards.
Applications
The TCA9554ADBQR is suitable for a variety of applications where additional I/O ports are required. These include:
- Switches and push-buttons.
- Sensors and monitoring systems.
- LED indicators and lighting systems.
- Fans and other motor control systems.
- General-purpose I/O expansion in embedded systems.
Q & A
- What is the power supply voltage range of the TCA9554ADBQR?
The power supply voltage range is from 1.65 V to 5.5 V. - What are the supported I2C/SMBus clock frequencies?
The device supports both 100 kHz (Standard-mode) and 400 kHz (Fast-mode) clock frequencies. - How many devices can be connected on the same I2C bus?
Up to eight devices can be connected on the same I2C bus using the A0, A1, and A2 address pins. - What type of interrupt output does the TCA9554ADBQR have?
The device has an open-drain active-low interrupt output on the INT pin. - How is the device reset?
The device can be reset by cycling the power supply and causing a power-on reset. - Does the TCA9554ADBQR have ESD protection?
Yes, it exceeds JESD 22 standards with 2000-V Human-Body Model and 1000-V Charged-Device Model protection. - What is the package type of the TCA9554ADBQR?
The package type is 16-pin SSOP. - Can the TCA9554ADBQR drive LEDs directly?
Yes, the device has latched outputs with high-current drive capability for directly driving LEDs. - Does the TCA9554ADBQR have noise filtering on the SCL/SDA inputs?
Yes, it includes noise filters on the SCL/SDA inputs. - What is the standby current consumption of the TCA9554ADBQR?
The device has low standby current consumption.
