Overview
The TCA9555DBR from Texas Instruments is a 16-bit I2C/SMBus I/O expander designed for general-purpose remote I/O expansion. It operates within a voltage range of 1.65-V to 5.5-V and is compatible with most microcontroller families via the I2C interface. This device is particularly useful for expanding the I/O capabilities of microcontrollers in various applications. At power-on, the I/Os are configured as inputs, but they can be configured as outputs by writing to the I/O configuration bits. The TCA9555DBR includes internal I/O pull-up resistors, which differentiate it from the TCA9535 model.
Key Specifications
| Specification | Value |
|---|---|
| Package | SSOP (DB) with 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Voltage Range | 1.65-V to 5.5-V |
| I2C Bus Speed | 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 |
| I/O Configuration | Configurable as inputs or outputs |
| Interrupt Output | Open-Drain Active-Low |
| Addressing | Configurable Slave Address with 3 Address Pins (A0, A1, A2) |
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
- Polarity Inversion Register
- Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
- ESD Protection Exceeds JESD 22
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
Applications
The TCA9555DBR is suitable for a wide range of applications where remote I/O expansion is necessary. These include:
- Industrial Automation
- Consumer Electronics
- Medical Devices
- Automotive Systems
- Embedded Systems
Q & A
- What is the voltage range of the TCA9555DBR?
The TCA9555DBR operates within a voltage range of 1.65-V to 5.5-V. - What is the maximum standby-current consumption of the TCA9555DBR?
The maximum standby-current consumption is 3.5 µA. - What is the I2C bus speed of the TCA9555DBR?
The I2C bus speed is 400 kHz. - How are the I/Os configured at power-on?
The I/Os are configured as inputs at power-on. - Can the TCA9555DBR drive LEDs directly?
Yes, the TCA9555DBR has latched outputs with high-current drive capability for directly driving LEDs. - What is the ESD protection level of the TCA9555DBR?
The ESD protection exceeds 2000-V Human-Body Model (A114-A) and 1000-V Charged-Device Model (C101). - 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 purpose of the internal I/O pull-up resistors?
The internal I/O pull-up resistors pull the I/O to a default high when configured as an input and undriven. - Is the TCA9555DBR compatible with most microcontrollers?
Yes, the TCA9555DBR is compatible with most microcontroller families. - What is the operating temperature range of the TCA9555DBR?
The operating temperature range is -40°C to 85°C.
