Mcube EV3672A Manuale utente

The MC3672 Evaluation Board Quick Start Guide and Demo

mCube Proprietary. APS-045-0017v1.51 / 21

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 EV3672A/B 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/SPI and gives out motion detection

or sample acquisition conditions to trigger

an interrupt toward an 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 EV3672A/B 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

 
 The MC3672 Evaluation Board Quick Start Guide and Demo 
mCube Proprietary. APS-045-0017v1.52 / 21 
© 2020 mCube Inc. All rights reserved. 
TABLE OF CONTENTS 
1General Operation ........................................................................................................... 4 
1 Pinouts................................................................................................................................. 4 
2 Power Pins........................................................................................................................... 4 
3 I2C Pins............................................................................................................................... 5 
4 SPI Pins............................................................................................................................... 6 
5 Interrupt Pins........................................................................................................................ 6 
2Assembly and Test.......................................................................................................... 7 
1 I2C Interface ........................................................................................................................ 7 
2 SPI Interface........................................................................................................................ 8 
3Demo............................................................................................................................... 9 
1 Download the Driver from GitHub......................................................................................... 9 
2 Load the Demo .................................................................................................................. 10 
4Library Reference.......................................................................................................... 12
1 Create mCube_MC36XX Object ........................................................................................ 12 
2 Initialize and Configure Sensor........................................................................................... 12 
3 Set Range.......................................................................................................................... 12 
4 Read Range....................................................................................................................... 12 
5 Set Resolution.................................................................................................................... 12 
6 Read Resolution................................................................................................................. 13 
7 Set CWake Sampling Rate................................................................................................. 13 
8 Read CWake Sampling Rate.............................................................................................. 13 
9 Set Sniff Sampling Rate..................................................................................................... 13 
10 Read Sniff Sampling Rate.................................................................................................. 13 
11 Config Sniff Mode............................................................................................................... 13 
12 Config Interrupt Mode ........................................................................................................ 14 
13 Read Raw Count Data ....................................................................................................... 14 
5Downloads..................................................................................................................... 15
1 MC3672 Accelerometer Datasheet and Quick Start Guide................................................. 15 
2 MC36XX Driver at GitHub .................................................................................................. 15 
3 All Other mCube Documentation........................................................................................ 15 
6Schematics.................................................................................................................... 16

The MC3672 Evaluation Board Quick Start Guide and Demo

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7Bill of Materials .............................................................................................................. 18

8Fabrication Print............................................................................................................. 19

9Revision History............................................................................................................. 20

10 Legal.............................................................................................................................. 21

MC3672 3-Axis Accelerometer EV3672A/B Quick Start Guide and Demo

mCube Proprietary. APS-045-0017v1.54 / 21

1 GENERAL OPERATION

1.1 PINOUTS

1.2 POWER PINS

•DVDD –3.3V Power Supply Input

•GND –Ground Pin for Power and Logic

•R7: The current drawn the sensor can be measured by putting an ammeter in

place of R7.

•In the following demonstration, an Arduino DUE is used to illustrate on how to test

the evaluation board with a microcontroller.

•Please be advised that if an Arduino UNO is used instead, hardware modification

on Arduino UNO MUST be made for it to output at 3.3V. (WARNING: attempting to

power the part at 5V is likely to damage it.)

By default, Arduino UNO operates at 5V, which is higher than the maximum

voltage rating for the evaluation board. Please refer to an excellent tutorial on

modifying Arduino UNO to output at 3.3V:

https://learn.adafruit.com/arduino-tips-tricks-and-techniques/3-3v-conversion

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1.3 I2C PINS

•Connect the SCL (I2C clock pin) to your microcontroller’s I2C clock line.

•Connect the SDA (I2C data pin) to your microcontroller’s I2C data line.

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.

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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 four wires commonly connected

to all the devices:

Connect the SCS (Slave Chip 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).

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).

R6: If using the sensor interrupt signal as open-drain, then install pull-up resistor ~4.7KΩ

into R6 (not installed by default).

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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/B evaluation board can be easily wired to any microcontroller. This example

shows a typical Arduino DUE 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. (WARNING: attempting to power the part at

a voltage exceeds the maximum rating of 3.6V is likely to damage it.)

•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 SDO pin to VDD.

MC3672 3-Axis Accelerometer EV3672A/B Quick Start Guide and Demo

mCube Proprietary. APS-045-0017v1.58 / 21

2.2 SPI INTERFACE

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

shows a typical Arduino DUE 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. (WARNING: attempting to power the part at

a voltage exceeds the maximum rating of 3.6V is likely to damage it.)

•Connect GND to common power/data ground.

•Connect SCL to ICSP-3 as Serial Clock.

•Connect SDO to ICSP-1 as Master Input, Slave Output.

•Connect SDA to ICSP-4 as Master Output, Slave Input.

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

Place the Accelerometer_MC36XX 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

MC3672 3-Axis Accelerometer EV3672A/B Quick Start Guide and Demo

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3.2 LOAD THE DEMO

Open File->Examples->MC36XX-> MC36XX_demo and upload to your Arduino while it is

wired to the sensor.

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

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