Mcube MC3672 Operating and maintenance instructions

MC3672 Accelerometer Driver Quick Start Guide and Demo

mCube Proprietary. APS-045-0017v1.2 1 / 19

GENERAL DESCRIPTION

The MC3672 is an ultra-low power, low

noise, integrated digital output 3-axis

accelerometer with a feature set optimized

for wearables and consumer product

motion sensing. Applications include

wearable consumer products, IoT devices,

user interface control, gaming motion input,

electronic compass tilt compensation for

cell phones, game controllers, remote

controls and portable media products.

The EVA3672A is a prebuilt circuit board

with MC3672 WLCSP 3-axes sensor. The

MC3672 has internal sample rate from 14 to

1300 samples / second and measures

acceleration with a wide usage range, from

+/-2g up to +/-16g, and 6-bit to 14-bit high

precision ADC output, which is easy to fit

on top of the microcontroller, such as an

Arduino. The accelerometer communicates

via I2C and gives out motion detection or

sample acquisition conditions to trigger an

interrupt toward a MCU.

The sensor data is easily readable by

connecting DVDD to 3.3V, GND to ground,

and SCL/SDA pins to your Arduino I2C

clock and data pin respectively. Download

the MC3672 library from GitHub onto the

board, run the example sketch, and then

sensor data shortly comes out in raw data

count and SI unit accelerometer

measurements. An easy-to-use

demonstration on EVA3672A using the

Arduino platform is included in this

document.

MC3672 FEATURES

Range, Sampling & Power

•±2,4,8,12 or 16g ranges

•8, 10 or 12-bit resolution with FIFO

o14-bit single samples

•Sample rate 14 - 1300 samples/sec

•Sample trigger via internal oscillator,

clock pin or software command

•Sniff and Wake modes

•0.4 μA Sniff current @ 6Hz

•Separate or combined sniff/wake

•Ultra-Low Power with 32 sample

FIFO

o0.9 μA typical current @ 25Hz

o1.6 μA typical current @ 50Hz

o2.8 μA typical current @ 100Hz

o36 μA typical current @ 1300Hz

Simple System Integration

•I2C interface, up to 1 MHz

•SPI Interface, up to 8 MHz

•1.29 × 1.09 × 0.742 mm 8-pin

WLCSP package

•Single-chip 3D silicon MEMS

•Low noise to 2.3mg RMS

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TABLE OF CONTENTS

1General Operation ........................................................................................................... 3

2Assembly and Test.......................................................................................................... 6

3Demo............................................................................................................................... 8

4Library Reference.......................................................................................................... 11

5Downloads..................................................................................................................... 15

6Schematics.................................................................................................................... 16

7Fabrication print............................................................................................................. 17

8Revision History............................................................................................................. 18

9Legal.............................................................................................................................. 19

MC3672 Accelerometer Driver Quick Start Guide and Demo

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1 GENERAL OPERATION

1.1 PINOUTS

1.2 POWER PINS

DVDD –3.3V Power Supply Input

GND –Ground Pin for Power and Logic

1.3 I2C PINS

Connect the SCL (I2C clock pin) to your microcontroller’s I2C clock line. This pin can be

used with 3V logic. A 4.7K pull-up resistor is required for this pin. Simply, add a 4.7K pull-

up resistor on R4 to make the I2C clock signal works normally.

Connect the SDA (I2C data pin) to your microcontroller’s I2C data line. This pin can be

used with 3V logic. A 4.7K pull-up resistor is required for this pin. Simply, add a 4.7K pull-

up resistor on R5 to ensure functionality of the I2C data signal.

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R4, R5: If using I2C and I2C pull-up resistors are needed for your application then

install~4.7KΩ resistors into R4 (SCL clock pin) and R5 (SDA data pin) which are not

installed by factory default. In addition, besides soldering resisters on R4/R5, you can add

axial lead 4.7K ohm resistors to the SDA and SCL pin respectively. It will work the same

either way.

NOTE: DO NOT install more than one setup pull-up resistors per I2C bus.

1.4 SPI PINS

With an SPI connection, there is always one master device (usually a microcontroller)

which controls the peripheral devices. Typically, there are three wires commonly

connected to all the devices:

Connect the SCS (Slave Select) to the pin on the device that the master can use to enable

and disable SPI cycles.

Connect the SCL (Serial clock) to the pin where the clock pulses synchronize data

transmission generated by the master

Connect SDO to the pin where the Slave sends data to the master (Master Input, Slave

Output).

Connect SDA to the pin where the Master sends data to the peripherals (Master Output,

Slave Input).

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1.5 INTERRUPT PINS

INT - HW interrupt signal pin. This pin will be triggered by the device when data is ready

to read, or a motion event is detected by the accelerometer. (Not currently supported in

the library for the interrupt pin, so please check the datasheet for the I2C commands and

related registers).

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2 ASSEMBLY AND TEST

Please note that the SPI and I2C interfaces cannot both be active at the same time as

the clock (SCK) and data (SDA) are shared between the two protocols.

2.1 I2C INTERFACE

The EV3672A evaluation board can be easily wired to any microcontroller. This example

shows a typical Arduino UNO platform. For other microcontrollers, be sure it has I2C with

repeated-start support, then port the code. Please refer to the illustration below to connect the

related pins.

•Connect DVDD to the power supply, 3.3V. (Providing higher voltage, like 5V may

damage the sensor).

•Connect GND to common power/data ground.

•Connect the SCL pin to the I2C clock SCL pin on your Arduino.

•Connect the SDA pin to the I2C data SDA pin on your Arduino.

The MC3672 has a default I2C address of 0x4C and it can be changed to 0x6C by tying

the DOUT pin to VDD.

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2.2 SPI INTERFACE

The EV3672A evaluation board can be easily wired to any microcontroller. This example

shows a typical Arduino UNO platform. Please refer to the illustration below for connecting the

related pins and then port the code to get the raw X, Y, Z sensor data.

•Connect DVDD to the power supply, 3.3V. (Providing higher voltage, like 5V may

damage the sensor.)

•Connect GND to common power/data ground.

•Connect SCL to digital I/O pin 13 as Serial Clock.

•Connect SDO to digital I/O pin 12 as Master Input, Slave Output.

•Connect SDA to digital I/O pin 11 as Master Output, Slave Input.

•Connect SCS to digital I/O pin 10 as Slave Select.

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3 DEMO

3.1 DOWNLOAD THE DRIVER FROM GITHUB

To begin reading sensor data, you will need to download the MC3672 Library from the

GitHub repository. Do this by visiting the GitHub repository and manually downloading or

simply click this button the attached URL to download the zip file.

https://github.com/mcubemems/Accelerometer_MC36XX

Rename the uncompressed folder Accelerometer_MC36XX and check that the

Accelerometer_MC36XX folder consisting of MC36XX.cpp and MC36XX.h

If you need the sensor running on SPI, please configure the bus as SPI in the

MC36XX.h shown as below. Otherwise, the default is I2C bus.

//#define MC36XX_CFG_BUS_I2C

#define MC36XX_CFG_BUS_SPI

SPI could support 8MHz speed if high speed mode is enabled as below.

#define SPI_HS

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Place the Accelerometer_MC3672 library folder to your

Arduino_sketch_folder/libraries/ folder.

You may need to create the library subfolder if it is your first library files. Then just restart

the IDE.

An excellent tutorial on Arduino library installation is located at:

http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use

3.2 LOAD THE DEMO

Open File->Examples->MC3672-> MC3672demo and upload to your Arduino while it is wired

to the sensor.

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Now open the serial terminal window at 115,200 baud rate speed to begin the test.

You will see the output from the serial terminal showing the current range scale and resolution

of the sensor in the first three lines followed by two lines of output sensor data at some output

data rate which depict “raw count" data for line 1: X: 6 Y: -2 Z: 1016 with 8G range, 14bit ADC

resolution. Line 2 indicates the SI units for measuring acceleration as X: 0.06 m/s^2 Y: -0.02

m/s^2 Z: 9.73 m/s^2.

This demo also includes the example for FIFO and Sniff interrupt mode. Those could be

enable by modify the definition below. These two examples must be run separately.

#define ENABLE_FIFO_WAKEUP 1

#define ENABLE_SNIFF_SHAKE_WAKEUP 0

Default input pin for interrupt is pin 8 and default FIFO threshold is 3 samples. FIFO size could

be set to maximum 32 samples or just enable FIFO to FIFO_FULL mode.

#define INTERRUPT_PIN 8

#define FIFO_SIZE 3

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