Memsic DB3672B Manuel utilisateur

DB3672B Demo Board User Guide

MEMSIC Semiconductor (Tianjin) Co., Ltd.

MEMSIC DB3672B APS-045-0031 v1.1 Page 2 of 22 Formal release date: 2020/08/17

INTRODUCTION

The DB3672B Demo Board is a standalone accelerometer demonstration platform that enables

firsthand user experience of the IoMT (Internet of Moving Things) functionality for the latest

MEMSIC motion sensors. It highlights either the MC3672 (1.1 x 1.3 mm CSP) and MC3635 (1.6

x 1.6 mm LGA) ultra-low power, 3-axis accelerometers by providing g-force data to 32-bit ARM

Cortex-M4. Motion sensing algorithms are performed in firmware on the MCU to demonstrate

popular accelerometer use cases. These include a variety activity tracking, user interface and

power management functions. Results and status are displayed live on the on-board OLED

display. The board is also equipped with an USB/UART interface for easy firmware upgrades

and external power.

Figure 1: Top View

Figure 2: Bottom View

 
MEMSIC DB3672B APS-045-0031 v1.1 Page 3 of 22 Formal release date: 2020/08/17 
TABLE OF CONTENTS 
Introduction................................................................................................................................ 2 
Features .................................................................................................................................... 4 
Component Layout .............................................................................................................................4 
Demo Applications..................................................................................................................... 6
Application Flow ................................................................................................................................. 6 
Firmware Update Tool............................................................................................................. 12
Current Measurement.............................................................................................................. 14
Schematics.............................................................................................................................. 16
EV3672/EV3635 EVAL boards install...................................................................................... 19
Order a board from www.mouser.com/............................................................................................. 19 
GET quick start guide from MEMSIC................................................................................................19 
Plug ev36xxa into a breadboard ....................................................................................................... 19 
Connect to processor(arduino) via spi or i2c..................................................................................... 20 
GET drivers from MEMSIC............................................................................................................... 20 
Load and run mc36xx demo ............................................................................................................. 21 
Revision History....................................................................................................................... 22
 
 
 
 
 
 
 
 
 
 
 

MEMSIC DB3672B APS-045-0031 v1.1 Page 4 of 22 Formal release date: 2020/08/17

FEATURES

The DB3672B (demo) board offers the following features:

1. MEMSIC 3-axis Accelerometer MC3635 (U9) in 1.6 x 1.6mm LGA package

2. MEMSIC 3-axis Accelerometer MC3672 (U10) in 1.3 x 1.1 mm WLCSP package

3. Ambiq 32-bit ARM Cortex-M4F Apollo2 MCU (U7) with 48 MHz clock frequency, 1 MB

flash storage and 256 KB SRAM

4. 0.96" 128x64 monochrome OLED (U11) using ssd1306 controller

5. CP210x USB-to-UART interface(J1) chip for connection to PC

6. Four LEDs:

1. Application controllable Red(D3), Green(D4), Yellow(D5)

2. Power(D2)

7. Push-button (SW3)

8. Power-on slide switch (SW4)

9. Pre-programmed bootloader

10.Coin-cell battery CR2032 (BT1) powered for standalone use

11.Demo application with various motion algorithms

COMPONENT LAYOUT

D2 (power LED)

SW3 (button)

SW4 (power slide switch)

U10 (MC3672)

U9 (MC3635)

U7 (MCU)

U11 (OLED screen)

D3, D4, D5 (LEDs)

Figure 3 Components (front view)

MEMSIC DB3672B APS-045-0031 v1.1 Page 5 of 22 Formal release date: 2020/08/17

BT1

(CR2032)

(MC3635 PWR

measurement

connector)

(MC3672 PWR

measurement

connector)

Figure 4 Components (bottom view)

MEMSIC DB3672B APS-045-0031 v1.1 Page 6 of 22 Formal release date: 2020/08/17

DEMO APPLICATIONS

DB3672B illustrates with a few common IoT gestures of accelerometer. All results are shown

on screen with LEDs to assist demonstration, which consists of following features:

Feature

KPI

Memory

(KB)

DMIPS

Version

Comments

Data

Readout

N/A

v1.0.0

Raw data

Tap

90%

2.7

0.32

v1.0.0

Single Tap

95%

Double Tap

90%

Triple Tap

Shake

95%

1.3

0.23

v1.0.0

2 (or more) back-and-forth shakes

Freefall

99%

0.6

0.16

v1.0.0

> 2 cm drop

Tilt Angle

N/A

3.6

6.73

v1.0.0

Pitch/Roll

Face Side

N/A

v1.0.0

Dominant side

Jump

Rope

90%

1.7

0.03

v1.0.0

Jump rope

Activity

95%

3.5

1.64

v1.0.0

Steps/State

Sniff

N/A

v1.0.0

Power switch

APPLICATION FLOW

The board can be turned-on by sliding the power slide switch (SW4) to the right. When

powered ON, it will show a splash screen containing logo with FW version.

Figure 5 splash screen

Application version

MEMSIC DB3672B APS-045-0031 v1.1 Page 7 of 22 Formal release date: 2020/08/17

Splash screen is followed by 1st feature on sensor data output. Long press (SW3) to toggle

sensor MC3672 and MC3635. Default accelerometer is MC3672 (U10). See Image below for

Figure 6 Data mode

Tap Mode: On pressing button (SW3), subsequent feature is shown. This button is used to

toggle between different demo modes. First feature is Tap mode.

Tap window: waiting for tapping on the

screen

When screen is tapped once, Single Tapped

is shown and Red LED (D3) is ON for 2

seconds

When screen is tapped twice within 0.3 secs,

Double Tapped is shown and Yellow LED

(D4) is ON for 2 seconds.

When screen is tapped three times with

0.7secs, Triple Tapped is shown and Green

LED (D5) is ON for 2 seconds.

Figure 7 Tap Mode

Selected sensor

Battery level

Mode

MEMSIC DB3672B APS-045-0031 v1.1 Page 8 of 22 Formal release date: 2020/08/17

Shake Mode:

Shake mode window: waiting for shake event

When device is shaken two to-and-fro

movement, Shaken is shown and Red LED

(D3) is ON for 2 seconds.

Figure 8 Shake Mode

Freefall Mode:

Freefall mode window: waiting for freefall

event

When device dropped over 10 cm height,

freefall event is shown on screen and Green

LED (D5) is ON for 2 seconds.

Figure 9 Freefall Mode

Tilt Mode:

Tilt mode: Shows Roll and Pitch angle when

board is rotated along X and Y axis.

Pitch > abs(30o), Green LED is ON

Roll > abs((30o), Yellow LED is ON

Both Green and Yellow are ON when Pitch

and Roll > abs(30o).

Figure 10 Tilt Mode

MEMSIC DB3672B APS-045-0031 v1.1 Page 9 of 22 Formal release date: 2020/08/17

Face Side Mode:

Dominant side displayed on screen, +Z when

board is parallel to the plane of the horizon.

Figure 11 Face Side Mode

Jump Rope Mode:

Jump mode: waiting for Jump

Jump Rope mode: track number of Jumps

Figure 12 Jump Rope Mode

Activity Mode: In this mode DB3672B acts like a pedometer, which measures number of

steps taken and current state: still, walking or running. At least 10 steps required to transit from

Still to “Walking” or “Running” for every single trial.

Activity mode: no activity

Steps: 0

State: Still

MEMSIC DB3672B APS-045-0031 v1.1 Page 10 of 22 Formal release date: 2020/08/17

Activity mode: Walking

Steps: number of step count

State: Walking

Activity mode: Running

Steps: number of step count

State: Running

Figure 13 Activity Mode

Sniff Mode: Sniff mode is a unique feature in MC3672/MC3635 to have sensor enter an ultra-

low power state (0.4uA) and can be activated when significant motion is detected.

Sniff mode: waiting for motion detection

Sniff mode: motion detected event displayed

on screen for 2 seconds

Figure 14 Activity Mode

After Sniff page, subsequent screen shows QR code followed by Data page again in loop.

QR Code

Figure 15 QR code Mode

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