ET2102

Overview

The ET2102 is a dual-channel bidirectional voltage-level translator IC designed for I2C bus compatibility. It supports configurable interfaces between any two logic levels ranging from 1.65V to 5.5V, accommodating both open-drain and push-pull environments. The device features internal 10kΩ pull-up resistors and automatic direction sensing, eliminating the need for external direction control signals or system GPIO resources. It ensures isolation between ports while allowing either VCCA or VCCB to power up first. If either supply rail drops to ground, the outputs switch to a high-impedance three-state condition.

Feature Summary

• Bidirectional voltage translation between 1.65V and 5.5V logic levels
• Automatic direction sensing without external control pins
• Internal 10kΩ pull-up resistors on both A and B ports
• Three-state output protection when supply voltage is removed

Applications

• I2C bus communication between master and slave devices with different voltage domains
• System GPIO resource expansion for level shifting
• Interfacing mixed-voltage digital components in embedded systems

Procurement Notes

Verify the manufacturer designation carefully, as the ET2102 identifier appears in multiple contexts within public databases. Confirm the specific datasheet matches the functional description of a dual-channel bidirectional level translator rather than other unrelated components sharing similar numeric codes. Ensure the package type corresponds to the 8-terminal leadless ultra-thin QFN (1.2mm x 1.4mm) specification if that form factor is required for your design.

Selection Notes

Select this component when designing circuits requiring seamless voltage translation between varying logic standards without complex firmware overhead. It is suitable for applications needing isolated voltage domains on an I2C bus where automatic direction detection simplifies the hardware design. Consider the operating temperature range and voltage ratings to ensure compatibility with the target system's power rails and environmental conditions.

Part Context

This component belongs to the category of interface bridge controllers, specifically focusing on voltage level translation for serial communication buses. It addresses the challenge of connecting devices operating at different supply voltages, such as 1.8V sensors to 3.3V or 5V microcontrollers, ensuring signal integrity across the interface boundary.

FAQ

Does the ET2102 require external direction control signals?

No, the device features automatic direction sensing functionality that detects input signals on either port and transmits them to the other port without needing external direction control pins.

What happens if one of the supply voltages is removed?

If either VCCA or VCCB is removed or drops to ground, the internal power-down control circuit automatically switches the outputs to a three-state high-impedance condition.