SparkFun Temperature Sensor - STTS22H (Qwiic) Hookup Guide

Contributors: Ell C

Hardware Overview

STTS22

The STTS22H is an ultralow-power, high-accuracy, digital temperature sensor offering high performance over the entire operating temperature range. Thanks to its factory calibration the STTS22H offers high-end accuracy performance over the entire operating temperature range, reaching as low as ±0.5 °C without requiring any further calibration at the application level. The sensor operating mode is user-configurable and allows selecting between different ODRs (down to 1 Hz) or the one-shot mode for battery saving. In one-shot mode, the sensor current consumption falls to 1.75 µA. For more information, refer to the datasheet.


STTS22	STTS22 on Micro

Qwiic Connectors

There are two Qwiic connectors on either side of the SparkFun Temperature Sensor - STTS22H to provide power and I²C connectivity simultaneously. The Micro version has a single Qwiic connector that again provides power and I²C connectivity. The I²C address of both boards is 0x3C by default, but the 1x1 board has 3 other addresses the board can be configured to use, while the Micro has 1 other address available.


Qwiic Connectors	Qwiic Connector on Micro

Power

Ideally, power will be supplied via the Qwiic connector(s). Alternatively, power can be supplied through the header along the bottom side of the board labeled 3V3 and GND. The input voltage range should be between 1.5-3.6V. The Micro version has a single Ground Pin available.


3.3V & GND Pins	GND Pin on Micro

⚡ Note: There is no onboard voltage regulation on either of these boards. If you choose to provide power via the plated through holes, ensure that your voltage does not exceed 5.5V.

Interrupt Pin

An interrupt pin is available to signal the application whenever the selectable high or low threshold has been exceeded.


Interrupt Pin	Interrupt Pin on Micro

Power LED

Hopefully this is self-explanatory, but this LED lights up when power is supplied to the board.


Power LED	Power LED on Micro

Exposed Pad

There's an extra pad on the bottom side of each board that allows for the most accurate possible readings.


Exposed Pad	Exposed Pad on Micro

Jumpers

LED Jumper

If power consumption is an issue, cut this jumper to disable the LED on the front of the board.


Power LED Jumper	Power LED Jumper on Micro

Address Jumpers

The 1x1 board has two address jumpers available. The default I²C address is 0x3C. By cutting various trace combinations, there are three other I²C addresses available.

ADDR
R8(15K)	0x3C (Default)
R7(56K)	0x3E
VDD	0x38
GND	0x3F
OPEN	Undefined


Address Jumper	Address Jumper 1

The Micro version of this board has a single address jumper that affords the ability to change the I²C address from 0x3C (Default) to 0x38.

Address jumper is highlighted on the back of the Micro Board

I²C Jumper

These boards are both equipped with pull-up resistors. If you are daisy-chaining multiple Qwiic devices, you will want to cut this jumper; if multiple sensors are connected to the bus with the pull-up resistors enabled, the parallel equivalent resistance will create too strong of a pull-up for the bus to operate correctly. As a general rule of thumb, disable all but one pair of pull-up resistors if multiple devices are connected to the bus. To disable the pull up resistors, use an X-acto knife to cut the joint between the two jumper pads highlighted below.