Overview
The TCA9555DBT, produced by Texas Instruments, is a 16-bit I2C/SMBus I/O expander designed for operation within a voltage range of 1.65 to 5.5 volts. This device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface. It is particularly useful for expanding the I/O capabilities of microcontrollers in various applications. The TCA9555DBT is packaged in a 24-pin SSOP (DB) package and operates over a temperature range of -40°C to 85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SSOP (DB) - 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage | 1.65 to 5.5 V DC |
| Interface | I2C, SMBus |
| I2C Bus Frequency | 400 kHz |
| Standby-Current Consumption | 3.5 µA Maximum |
| ESD Protection | 2000-V Human-Body Model (A114-A), 1000-V Charged-Device Model (C101) |
| Latch-Up Performance | Exceeds 100 mA Per JESD 78, Class II |
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 3 Address Pins (A0, A1, A2)
- Polarity Inversion Register
- Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
- Internal I/O Pull-Up Resistor (distinguishes it from TCA9535)
Applications
The TCA9555DBT is suitable for a variety of applications where I/O expansion is necessary, including:
- Industrial Automation Systems
- Consumer Electronics
- Medical Devices
- Automotive Systems
- Embedded Systems Requiring Additional I/O Ports
Q & A
- What is the voltage range of the TCA9555DBT?
The TCA9555DBT operates within a voltage range of 1.65 to 5.5 volts.
- What type of package does the TCA9555DBT come in?
The TCA9555DBT is packaged in a 24-pin SSOP (DB) package.
- What is the operating temperature range of the TCA9555DBT?
The operating temperature range is -40°C to 85°C.
- What interfaces does the TCA9555DBT support?
The TCA9555DBT supports I2C and SMBus interfaces.
- How many devices can share the same I2C bus or SMBus?
Up to eight TCA9555 devices can share the same I2C bus or SMBus.
- What is the maximum standby-current consumption of the TCA9555DBT?
The maximum standby-current consumption is 3.5 µA.
- Does the TCA9555DBT have ESD protection?
- Can the TCA9555DBT drive LEDs directly?
- How is the I2C address configured on the TCA9555DBT?
The I2C address is configured using three hardware pins (A0, A1, and A2).
- What distinguishes the TCA9555DBT from the TCA9535?
The TCA9555DBT includes an internal I/O pull-up resistor, which is not present in the TCA9535.
