This module uses a set of transistors with pullup resistors to provide a 2 channel bi-directional voltage level conversion (level shifting) for digital logic signals. Intended mainly for the conversion of signals between 3.3V and 5V logic levels this module provides a way of safely interfacing a 5V microcontroller to a 3.3V device or conversely 3.3V microcontroller to a 5V device without risking damage to both devices. Both of the 2 channels can work in both directions meaning that bi-direction 2 way data signals can also be level shifted. Each side of the array can be supplied separately with the required level shifting voltage.
Key Features:
Bi-Directional Conversion – Supports both 5V to 3.3V and 3.3V to 5V signal shifting
2 Independent Channels – Works with multiple signal lines, perfect for I2C, UART, DIO etc
Easy-to-Use Pinout – Features a 0.1” header with the following labeled pins:
5V side
5V: 5V reference - connect to 5V device supply
A: Bi-directional data pin A
B: Bi-directional data pin B
GND: Connect to 5V device GND
3.3V side
3V: 3.3V reference - connect to 3V device supply
A: Bi-directional data pin A
B: Bi-directional data pin B
GND: Connect to 3.3V device GND
Specification:
3V Min input for 5V TTL logic high output (2.7V): 2.5V **
3V Min input for 5V TTL logic low output (0.4V): 0.5V **
5V min input for 3.3V TTL logic low output (2V): 2V **
5V min input for 3.3V TLL logic low output (0.8V): 0.9V **
3V ref (max): 5V ref - 1.2V
5V ref (max): 3V ref + 5V
5V ref (absolute max): 25V*
Dimensions (ex headers): 20mm x 10.5mm x 7.5mm
Header pitch: 0.1" / 2.54mm
* The 3V & 5V reference voltage of the level shifter must not exceed the digital I/O supply voltage of the connected device, as this can cause damage or improper operation.
** 3V ref = 3.3V, 5V ref = 5V
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