# Adafruit QT 3V to 5V Level Booster Breakout
## Overview
If you're looking to use the Qwiic / Stemma QT standard for your next project - but you're using a sensor or device that requires 5V power or logic, this board is designed for you! It will let you use the 3V power and logic from your Raspberry Pi, or ARM Cortex microcontroller, and boost/shift it up to 5V for use with older or high-power devices that aren't happy with only 3V.
These days, almost every microcontroller / microcomputer board has 3V power and logic: ESP32 series, ATSAMD chips, RP2040 boards, micro:bits, etc! But we still see sensors and devices here and there that really want 5V power or logic. [Like this Sensirion SEN54 which has a small motor](https://blog.adafruit.com/2022/02/10/eye-on-npi-sen54-environmental-sensor-node-eyeonnpi-digikey-digikey-adafruit-sensirion/) with 5V power requirements.
On one side of this board is 3V power and logic level inputs. In the middle is a [5V charge-pump boosting regulator that can provide 100mA continuous (250mA peak)](https://www.diodes.com/assets/Datasheets/AP3602A.pdf) plus level shifting circuitry. On the opposite side is the same I2C traffic but now safely shifted up to 5V. If you happen to be using a board that wants 5V power, but 3V logic I2C, there's a solder jumper on the back you can cut/solder to set the output logic level to unshifted 3V.
It's simple but very effective! You also get breadboard breakout pins for breadboard usage so it can also be used as a QT-to-perfboard adapter. [If you need something that does 5V to 3V down-conversion, we have that in the shop as well.](https://www.adafruit.com/product/5637)
The [STEMMA QT connectors](https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt) on either side are compatible with the I2C connectors. This allows you to make solderless connections between your development board and the QT Shifter or to chain it with a wide range of other sensors and accessories using a [**compatible cable**](https://www.adafruit.com/?q=stemma%20qt%20cable) [**QT Cable is not included** , but we have a variety in the shop.](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch)
# Adafruit QT 3V to 5V Level Booster Breakout
## Pinouts
## Power Pins
- **VIN** - this is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V.
- **5V** - this is the 5V output from the charge-pump boosting regulator. It can provide 100mA continuous and 200mA peak.
- **G** - common ground for power and logic.
## I2C Logic Pins
- **3CL** - I2C clock pin for incoming 3V logic, connect to your microcontroller I2C clock line. It's meant as the 3V logic input, but you can use 3-5V logic. There is a **10K pullup** on this pin.
- **3DA** - I2C data pin for incoming 3V logic, connect to your microcontroller I2C data line. It's meant as the 3V logic input, but you can use 3-5V logic. There is a **10K pullup** on this pin.
- **5CL** - I2C clock pin for outputting 5V logic, connect to your microcontroller I2C clock line. It is level shifted to output 5V logic. There is a **10K pullup** on this pin.
- **5DA** - I2C data pin for outputting 5V logic, connect to your microcontroller I2C data line. It is level shifted to output 5V logic. There is a **10K pullup** on this pin.
- **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt) -** These connectors allow you to connectors to dev boards with **STEMMA QT** connectors or to other things with [various associated accessories](https://www.adafruit.com/category/619).
- The connector behind the arrows on the silk is for the 3V logic input
- The connector being pointed to by the arrows on the silk is for the 5V logic output
Info: The pin labeled 5DL is a typo, it should say 5DA.
## Power LED and LED Jumper
- **Power LED** - In the lower right corner, below the STEMMA connector, on the front of the board, is the power LED, labeled **on**. It is a green LED.
- **LED jumper** - This jumper is located on the back of the board. Cut the trace on this jumper to cut power to the "on" LED.
## Vi2c Jumpers
If you happen to be using a board that wants 5V power, but 3V logic I2C, there are jumpers located on the back, labeled **Vi2C** , that you can cut/solder to set the output logic level to unshifted 3V.
- **5V jumper** - This jumper is located on the back of the board. Cut the trace on this jumper to set the output logic level to unshifted 3V.
- **In jumper** - This jumper is located on the back of the board. Solder this pad to the center **Vi2c** pad to set the output logic level to **VIN**.
# Adafruit QT 3V to 5V Level Booster Breakout
## Wiring
To use the 3V to 5V booster breakout, plug a 3V microcontroller power, ground, SCL and SDA pins into the 3V logic inputs. Then, wire up a breakout board to the 5V logic outputs. The breakout board will now receive 5V logic.
You can use STEMMA QT cables to connect to the logic booster.
- Plug the **3V microcontroller** into the **3V input STEMMA QT port** located behind the arrows on the board silk.
- Plug a STEMMA breakout board into the **5V output STEMMA QT port** located in front of the arrows on the board silk.
You can also use standard **0.100" pitch** headers to wire it up on a breadboard:
3V Logic Input
- **Board 3V** to **booster VIN**
- **Board GND** to **booster**** G**
- **Board SCL** to **booster**** 3CL**
- **Board SDA** to **booster**** 3DA**
5V Logic Output
- **Booster 5V** to **breakout VIN**
- **Booster G** to **breakout GND**
- **Booster 5DL** to **breakout SDA**
- **Booster 5CL** to **breakout SCL**
# Adafruit QT 3V to 5V Level Booster Breakout
## Downloads
## Files
- [AP3602A Datasheet](https://cdn-learn.adafruit.com/assets/assets/000/117/413/original/AP3602A.pdf?1673270911)
- [EagleCAD PCB Files on GitHub](https://github.com/adafruit/Adafruit-QT-3V-to-5V-Level-Booster-PCB)
- [3D Models on GitHub](https://github.com/adafruit/Adafruit_CAD_Parts/tree/main/5649%203V%20to%205V%20Level%20Booster)
- [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20QT%203V%20to%205V%20Level%20Booster%20Breakout.fzpz)
## Schematic and Fab Print
## Primary Products
### Adafruit QT 3V to 5V Level Booster Breakout - STEMMA QT / Qwiic
[Adafruit QT 3V to 5V Level Booster Breakout - STEMMA QT / Qwiic](https://www.adafruit.com/product/5649)
If you're looking to use the Qwiic / Stemma QT standard for your next project - but you're using a sensor or device that requires 5V power or logic, this board is designed for you! It will let you use the 3V power and logic from your Raspberry Pi, or ARM Cortex microcontroller,...
In Stock
[Buy Now](https://www.adafruit.com/product/5649)
[Related Guides to the Product](https://learn.adafruit.com/products/5649/guides)
## Featured Products
### STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long
[STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long](https://www.adafruit.com/product/4210)
This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
Out of Stock
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### STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long
[STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long](https://www.adafruit.com/product/4399)
This 4-wire cable is 50mm / 1.9" long and fitted with JST SH female 4-pin connectors on both ends. Compared with the chunkier JST PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
In Stock
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[Related Guides to the Product](https://learn.adafruit.com/products/4399/guides)
### STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable
[STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable](https://www.adafruit.com/product/4209)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium Dupont male headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert...
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### JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic
[JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic](https://www.adafruit.com/product/4398)
This cable will make it super easy to use our plug-and-play STEMMA QT boards with boards like Circuit Playground. On one end you get a Qwiic / STEMMA QT connector (technically known as a JST SH 4-pin plug) into 4 individual wires with grippy alligator clips. We're carrying these to...
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### STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets
[STEMMA QT / Qwiic JST SH 4-pin Cable with Premium Female Sockets](https://www.adafruit.com/product/4397)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium female headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and...
In Stock
[Buy Now](https://www.adafruit.com/product/4397)
[Related Guides to the Product](https://learn.adafruit.com/products/4397/guides)
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