Overview
The TCA6418E, produced by Texas Instruments, is an I2C controlled 18-channel GPIO expander. This device is designed to expand the GPIO capabilities of a microcontroller or other processor, allowing for more flexible and efficient use of available GPIOs. It operates within a power-supply voltage range of 1.65 V to 3.6 V, making it suitable for a wide range of applications. The TCA6418E features integrated ESD protection, low standby current consumption, and supports the I2C Fast Mode Plus (FM+) protocol, enabling high-speed data transfer.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 1.65 | 3.6 | V | |
| Input Voltage Range | -0.5 | 4.6 | V | |
| Operating Temperature Range | -40 | 85 | °C | |
| High-Level Output Current (GPIO0-17) | 10 | mA | ||
| Low-Level Output Current (GPIO0-17) | 25 | mA | ||
| Standby (Idle) Current Consumption | 3 | μA | ||
| I2C Bus Frequency | 1 | MHz | ||
| ESD Protection | 2000 | V (Human Body Model) | ||
| ESD Protection | 1000 | V (Charged Device Model) |
Key Features
- 18 general-purpose inputs/outputs (GPIOs) configurable as inputs or outputs via the I2C interface.
- Operating power-supply voltage range of 1.65 V to 3.6 V.
- Integrated ESD protection exceeding JESD 22 standards.
- Low standby (idle) current consumption of 3 μA.
- Supports I2C Fast Mode Plus (FM+) protocol.
- Open-drain active-low interrupt output.
- Selectable debounce time of 50 μs.
- Schmitt-trigger action on SCL and SDA inputs for better noise immunity.
- Very small package – WCSP (YFP): 2 mm × 2 mm, 0.4 mm pitch.
Applications
- Smart Phones
- PDAs
- GPS Devices
- MP3 Players
- Digital Cameras
Q & A
- What is the TCA6418E?
The TCA6418E is an I2C controlled 18-channel GPIO expander produced by Texas Instruments. - What is the operating voltage range of the TCA6418E?
The operating voltage range is from 1.65 V to 3.6 V. - How many GPIOs does the TCA6418E have?
The TCA6418E has 18 general-purpose inputs/outputs (GPIOs). - What type of ESD protection does the TCA6418E have?
The TCA6418E has integrated ESD protection exceeding JESD 22 standards, specifically 2000 V for the Human Body Model and 1000 V for the Charged Device Model. - What is the standby current consumption of the TCA6418E?
The standby (idle) current consumption is 3 μA. - Does the TCA6418E support fast I2C modes?
Yes, it supports the I2C Fast Mode Plus (FM+) protocol. - How can unused GPIOs be handled on the TCA6418E?
Unused GPIOs can be tied permanently to GND without an external pulldown resistor. - What is the purpose of the interrupt output on the TCA6418E?
The open-drain active-low interrupt output is used to indicate to the system master that an input state has changed. - What is the package size of the TCA6418E?
The package size is 2 mm × 2 mm with a 0.4 mm pitch (WCSP - YFP). - How does the power-on reset feature work on the TCA6418E?
The power-on reset holds the device in a reset condition until the supply voltage reaches the power-on reset threshold, and it can be reset by lowering the VCC below 0.2 V and then ramping it back up to the operating voltage.
