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Showing content from https://learn.sparkfun.com/tutorials/mma8452q-accelerometer-breakout-hookup-guide/hardware-overview below:

MMA8452Q Accelerometer Breakout Hookup Guide

Contributors:

jimblom Hardware Overview

The MMA8452Q Breakout Board breaks out a select few of the most important pins on the accelerometer.

A little bit about each pin:

Pin Label Pin Function Input/Output Notes 3.3V Power Supply Input Should be between 1.95 - 3.6V SDA I²C Data Signal Bi-directional Bi-directional data line. Voltage should not exceed power supply (e.g. 3.3V). SCL I²C Clock Signal Input Master-controlled clock signal. Voltage should not exceed power supply (e.g. 3.3V). I2 Interrupt 2 Output Programmable interrupt — can indicate data ready, orientation change, tap, and more. I1 Interrupt 1 Output Programmable interrupt — can indicate data ready, orientation change, tap, and more. GND Ground Input 0V/common voltage. Voltage Supply Requirements

The big alert here is that the MMA8452Q has a maximum voltage of 3.6V -- that range applies to both the power supply and the I²C pins. If you're using the sensor in a 3.3V system you can plug it right in, but if you're using it with a 5V device (like an Arduino Uno), some level-shifting is required between devices.

Fortunately, you don't need a lot of power to make the MMA8452Q work. In normal operating mode it can require anywhere between 7 and 165 µA.

Address Select Jumper

The MMA8452Q features a selectable I²C address -- just in case you're running multiple MMA8452Qs on the same bus (or maybe you have an address conflict). To select the address, a pin on the accelerometer -- "SA0" -- can be tied to either power or ground.

SA0 Voltage MMA8452Q I²C Address 0V 0x1C 3.3V (VCC) 0x1D

The breakout board includes a jumper, on the back side, to help tie this pin high or low.

By default the jumper is open, which will pull the SA0 pin high (there's a resistor on the top side of the board to help accomplish that task). If you close the jumper, by applying a small solder blob to connect both pads together, SA0 will be pulled to ground.

For most use cases, where you're only using one MMA8452Q, you can leave this jumper untouched. In that case the I²C address will be 0x1D.

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