If you have ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The LC-04 bi-directional logic level converter is a small device that safely steps down 5V signal to 3.3V and steps up 3.3V to 5V at the same time. In cette instructable, mybotic explained the procedure to use the LC-04 bi-directional logic converter.
Description:
The LC-04 module offers bi-directional shifting of logic level for up to four channels. The logic level HIGH (logic 1) on each side of the board is achieved by 10K Ω pull-up resistors connected to the respective power supply. This provides a quick enough rise time of logic level to convert high frequency (400KHz I²C, SPI, UART etc.) signals without delay.
This module has the following features:
- Dual-supply bus translation :
- Lower-voltage (LV) supply can be 1.5 V to 7 V
- Higher-voltage (HV) supply can be LV to 18 V
- Four bi-directional channels
- Small size: 0.4″ × 0.5″ × 0.08″ (13 mm × 10 mm × 2 mm)
- Breadboard-compatible pin spacing
The Pinout:
The LC-04 logic level converter has two types of pins:
- Voltage input pins :
- 2 pins (GND and LV) on Low Voltage side
- 2 pins (GND and HV) on High Voltage side
- Data channels :
- 4 pins (LV1, LV2, LV3, and LV4) on Low Voltage side
- 4 pins (HV1, HV2, HV3, and HV4) on High Voltage side
Pin HV et LV set HIGH (logic 1) logic level on High voltage side and Low voltage side respectively, with respect to the GND.
Data channel pins shift logic levels from one voltage reference to another. A low voltage signal sent into LV1, for example, will be shifted up to the higher voltage and sent out through HV1. Similarly, a high voltage signal sent into HV1 will be shifted down to the lower voltage and sent out through LV1.
Read more: LC-04 4 Channel Logic Converter 3.3V – 5.0V
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