DB3672B

DB3672B Demo Board User Guide MEMSIC Semiconductor (Tianjin) Co., Ltd. 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 2 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 3 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 U11 (OLED screen) D3, D4, D5 (LEDs) U9 (MC3635) U10 (MC3672) D2 (power LED) SW3 (button) SW4 (power slide switch) U7 (MCU) Figure 3 Components (front view) MEMSIC DB3672B APS-045-0031 v1.1 Page 4 of 22 Formal release date: 2020/08/17 J4 (MC3635 PWR measurement connector) BT1 (CR2032) J5 (MC3672 PWR measurement connector) Figure 4 Components (bottom view) MEMSIC DB3672B APS-045-0031 v1.1 Page 5 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 N/A N/A v1.0.0 Raw data 90% Tap 95% Single Tap 2.7 0.32 v1.0.0 90% Double Tap 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 N/A 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 N/A 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. Application version Figure 5 splash screen MEMSIC DB3672B APS-045-0031 v1.1 Page 6 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 Mode Battery level Selected sensor 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 MEMSIC DB3672B APS-045-0031 v1.1 Page 7 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 8 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 9 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 ultralow 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 MEMSIC DB3672B APS-045-0031 v1.1 Page 10 of 22 Formal release date: 2020/08/17 Raw Data QR code Tap(s) Sniff/ Power Switch Shake Jump Rope Free Fall Activity Detect Tilt Face Side Figure 16 Demo application flow MEMSIC DB3672B APS-045-0031 v1.1 Page 11 of 22 Formal release date: 2020/08/17 FIRMWARE UPDATE TOOL Get the tools from MEMSIC STEPS to update firmware: 1. Install CP2102 driver on your PC/laptop from link below: https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcpdrivers Figure 17 Installing USB-to-UART Driver 2. While pressing button (SW3) on sensor board, connect board to computer by micro USB cable 3. Now, on connecting sensor board to Windows PC will automatically install driver. Will show up in Device Manager as COM Port. See Image below. 4. Unzip “MEMSIC_DB3672B_tools v1.0.0.zip file 5. Click to open “DB3672_flash_tool.exe” application from package. (Do NOT copy it outside of the folder). 6. Press “Load” button and choose firmware binary file “MEMSIC_DB3672B_v1.0.0.bin” 7. Select your COM port from “SerialPort” drop-down list menu. Should match to the one found in device manager. Press “Reload” button in case this does not work 8. Now press “Program” button to flash firmware. 9. If you don’t see the Serial Port on the flash tool, which indicates that you may haven’t installed the USB-to-UART device driver successfully. Try to reinstall it again, then you will see the com port on the flash tool when USB plug-in. MEMSIC DB3672B APS-045-0031 v1.1 Page 12 of 22 Formal release date: 2020/08/17 Figure 18 Serial Port Not Detected Figure 19 DB3672 FW flash tool MEMSIC DB3672B APS-045-0031 v1.1 Page 13 of 22 Formal release date: 2020/08/17 CURRENT MEASUREMENT DB3672B board has a pair of jumpers for measuring current consumption on MEMSIC accelerometers (U9 & U10). J4 (MC3635) and J5(MC3672) jumper can be used to measure current on sensor, depicted ultra-low power at 0.4uA in Sniff mode. Figure 20 Current measurement by jumper J4, J5 MEMSIC DB3672B APS-045-0031 v1.1 Page 14 of 22 Formal release date: 2020/08/17 Figure 21 Sniff current at 6Hz Figure 22 Wake supply current @ ultra-low power, 25Hz Sensor Category Sniff Current @ 6Hz Wake Current @ ULP, 25Hz MC3672 MC3635 0.4 uA 0.4 uA 0.9 uA 0.9 uA MEMSIC DB3672B APS-045-0031 v1.1 Page 15 of 22 Formal release date: 2020/08/17 SCHEMATICS MEMSIC DB3672B APS-045-0031 v1.1 Page 16 of 22 Formal release date: 2020/08/17 MEMSIC DB3672B APS-045-0031 v1.1 Page 17 of 22 Formal release date: 2020/08/17 MEMSIC DB3672B APS-045-0031 v1.1 Page 18 of 22 Formal release date: 2020/08/17 EV3672/EV3635 EVAL BOARDS INSTALL ORDER A BOARD FROM WWW.MOUSER.COM GET QUICK START GUIDE FROM MEMSIC PLUG EV36XXA INTO A BREADBOARD MEMSIC DB3672B APS-045-0031 v1.1 Page 19 of 22 Formal release date: 2020/08/17 CONNECT TO PROCESSOR(ARDUINO) VIA SPI OR I2C GET DRIVERS FROM MEMSIC MEMSIC DB3672B APS-045-0031 v1.1 Page 20 of 22 Formal release date: 2020/08/17 LOAD AND RUN MC36XX DEMO MEMSIC DB3672B APS-045-0031 v1.1 Page 21 of 22 Formal release date: 2020/08/17 REVISION HISTORY Date 2019-06-18 2020-08-17 Revision APS-045-0031v1.0 APS-045-0031v1.1 MEMSIC DB3672B APS-045-0031 v1.1 Description First release. Change to MEMSIC format based on the License Agreement with mCube. Page 22 of 22 Formal release date: 2020/08/17