Logic Level Converter

SparkFun Logic Level Converter
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Model: BOB-11978
Manufacturer: SparkFun
Average Rating: 2 out of 5 Stars!

SparkFun

If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The SparkFun Logic Level Converter is a small device that safely steps down 5V signals to 3.3V and steps up 3.3V to 5V. This level converter also works with 2.8V and 1.8V devices. Each level converter has the capability of converting 4 pins on the high side to 4 pins on the low side. Two inputs and two outputs are provided for each side.

Bread board friendly! Can be used with normal serial, I2C, SPI, and any other digital signal. Does not work with an analog signal.

The SparkFun Logic Level Converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (2.8V for example) to 'LV', and ground from the system to the 'GND' pin.

Pins are labeled as Inputs and Outputs. These are relative to the board. A digital one going into the RXI pin on the 5V side will show up on the RXO pin on the 3.3V side as 3.3V. A digital one going into the TXI pin on the 3.3V side will show up on the TXO pin on the 5V side as 5V.

This revision of the Logic Level Converter fixes the issue with the board not stepping down from 5V to 3.3V correctly.

See our tutorial on Logic Level Conversion

SparkFun Logic Level Converter Dimensions: 0.5x0.6"

Documents for the SparkFun Logic Level Converter:

Schematic

 

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Logic Level Converter
Click to enlarge
Logic Level Converter
Click to enlarge
Logic Level Converter
Click to enlarge
Logic Level Converter
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