Silicon Laboratories SENSOR PUCK User Manual

Sensor Puck

SENSOR PUCK USER’S GUIDE

1. Introduction

The sensor puck demonstrates Silicon Laboratories optical sensor (Si1147-M01) RH and temperature sensor
(Si7021) and low power MCU (EFM32G210 “Gecko”). The data is broadcast using a Bluetooth Low Energy (BLE)
module and can be displayed on a mobile device (Apple iOS or Android) that supports the BLE protocol.

By using broadcast mode, a connection does not have to be established, making it possible to display the data
from several modules at the same time.

2. Evaluation Kit Description

The evaluation kit consists of a sensor puck with a battery and the on/off switch in the off position. Install the battery
if it is not installed. The + terminal of the battery faces away from the board towards the + terminal of the battery
holder. Remove the pull tab separating the battery from the battery holder if needed. When the switch is turned on,
the puck will automatically start taking and broadcasting data. For the puck itself, there is no installation required.

Rev. 1.0 2/15 Copyright © 2015 by Silicon Laboratories Sensor Puck

Figure 1. Silicon Labs Sensor Puck

Sensor Puck

The data that is broadcast is generally displayed on a mobile device. To display the data the Silicon Labs Sensor
Puck app must be installed on the mobile device. The application is available for no charge from the Apple App
Store or the Google Play Store. (Search for Silicon Labs Sensor Puck.)

3. Operation

 Environmental mode

Measures ambient light, UV index, ambient temperature, and ambient humidity.
This is the default mode of operation and the lowest power.
In this mode of operation measurements are taken and broadcast (once per second).
The LED flashes green once per measurement cycle.
The battery current consumption in this mode is approximately 1.5 mA average, which means that a standard CR2032

battery will last about five days. The battery for this demo is not rechargeable so it must be replaced if it is depleted.

 Biometric mode

At the once per second interval for environmental monitoring, the puck checks for the presence of an object over the

Si1147-M01 (under the acrylic cover).

If an object is detected the puck will go into biometric mode and attempt to measure heart rate.
Heart rate is measured by the reflection of IR light from an LED inside the Si1147-M01.
The light is reflected from a finger-tip to measure the heart rate.
In biometric mode the power consumption goes up to 7 mA, so battery life will decrease to about one day in this mode.
In biometric mode, the LED will flash red while it is acquiring the heartbeat and then switches to continuous green once

the heartbeat has been acquired.

To avoid excessive power drain in case the puck is left on and covered with an object, the puck will exit biometric mode

after 90 seconds. In this case, the object must be removed and a finger sho uld be placed over the acrylic cover to start
biometric monitoring again.

The data from the puck is broadcast over a BLE “advertisement” packet. The mobile device that displays the data does

not need to make a connection to the puck. For this reason, it possible that a single mobile device (i.e. a phone) can
display data from multiple pucks.

2 Rev. 1.0

Sensor Puck

4. Sensor Puck Applications

There is a Sensor Puck app for iOS devices and another Sensor Puck app for Android devices. Both apps are
named “Silicon Labs Sensor Puck”.

The iOS Sensor Puck app can be installed from the Apple App Store. The iOS app runs on devices with iOS 7 and
higher, and has Bluetooth 4.0 hardware. Silicon Labs has verified that the iOS app runs on iPhone 4S, 5, 5S, 6 and
6 Plus. The iOS app also runs on iPad 3 and 4.

The Android Sensor Puck app can be installed from the Google Play Store. The Android app runs on devices with
Android version 4.3 and higher, and has Bluetooth 4.0 hardware. Silicon Labs has verified that the Android app
runs on the following devices: Samsung Galaxy S4, Samsung Galasy S5, Samsung Galaxy Tab 3, Motorola
Moto E, Motorola Moto G, HTC Desire, HTC One Max, LG Nexus 5, LG G Flex, Sony Z1, Sony T2 Ultra, and Asus
Nexus 7.

When the puck is in environmental mode, the Silicon Labs Sensor Puck app displays the environmental screen:

Figure 2. Android Environmental Screen

Rev. 1.0 3

Sensor Puck

The environmental screen displays the environmental sensor measurements and the battery status. The puck
name is displayed at the top of the screen. The temperature scale can be changed between Celsius and
Fahrenheit by tapping the small C and F buttons.

When the puck is in biometric mode, the Android Sensor Puck displa ys th e bio m et ric scr een .

4 Rev. 1.0

Figure 3. Android Biometric Screen

Sensor Puck

The iOS Sensor Puck app does not have a biometric screen. The iOS app displays the heart rate in the lower right
corner of the environmental screen:

Figure 4. iOS Environmental Screen

Rev. 1.0 5

Sensor Puck

If there are several sensor pucks, you can use the navigation drawer to select a different puck. To open the
navigation drawer , tap on the three-line icon in the upper left corner of the screen or swipe from the lef t ed ge of the
screen.

Figure 5. Navigation Drawer

6 Rev. 1.0

Sensor Puck

You can change the name of a puck by tapping on the edit icon to the right of the puck name.

Figure 6. Puck Name

Rev. 1.0 7

Sensor Puck

Debug pins

VMCU

BLE

05-BLE

BLE_TX
BLE_RX
BLE_WAKE
HOST_WAKE

BLE_RESET

TP2
GND

Pulse

03-Pulse

SDA
SCL
INT

LEDs

07-LEDs

RED
GREEN

J2

HEADER 2x5/SM

112

2

334

4

556

6

778

8

9910

10

MCU

02-MCU

BLE_WAKE

RESET

I2C0_SDA

I2C0_SCL

LEU0_TX
LEU0_RX

SWDIO PF1
SWCLK PF0

SWO PF2

INT

RED

GREEN

HOST_WAKE

BLE_RESET

RHT

04-RHT

SDA
SCL

high = 4.1V low = 5.0V

Debug

VMCU

+5V

C11

0.1uF

C12
47uF

U4 TS3310

S1

4

STORE

9

S0

2

VGOOD

6

OUT_ON

1

LSW

8

IN

3

OUT

10

S2

5

EPAD11GND

7

L1

47uH

SW1
SW_SLIDE_2POS

123

C13
47uF

R11
47

BH1

20mm BATTERY HOLDER

POS

1

POS

3

NEG

2

5. Sensor Puck Hardware Description

5.1. Schematics

Figure 7 shows the block diagram of the puck with debug header MCU, the sensors, and the Bluetooth module.

Figure 8 shows the power section. The CR2032 battery is used to power most of the ICs. A boost converter is used
to produce 4.1 V which is used to power the LED of the Si1147 so it can be driven at higher current than is possible
with a coin cell battery.

Figure 9 shows the EFM32G210 “Gecko” MCU. The 24 MHz clock is only used in active periods . For lower power
consumption, the internal 32 K Hz R-C clock is used as mu ch as possible. A special calibration routine is used to
calibrate the 32 KHz clock against the 24 MHz crystal for accuracy in the UART communication speed while in low
power mode.

8 Rev. 1.0

Figure 7. Block Diagram

Figure 8. Power Section

Sensor Puck

Connect together then
connect tp power plane

Connect together then
connect tp power plane

DBG_SWCLK

DBG_SWDIO

DBG_SWO

TX

RX

SWDIO PF1

INT

SWO PF2
SWCLK PF0

GREEN

RED

LEU0_TX

LEU0_RX

BLE_WAKE

RESET

HOST_WAKE I2C0_SDA

I2C0_SCL

BLE_RESET

VMCU

VMCU

VMCU

C5 0.1uF

C2 0.1uF

R8 4.99K

C9
10pF

R10 4.99K

C4 0.1uF

C10
10pF

R9 4.99K

C3 0.1uF

EFM32G210

U2

PA0

1

PA1

2

PA2

3

IOVDD

4

PC0

5

PC1

6

PB7

7

PB8

8

PC15

24

PC14

23

PC13

22

DEC

21

VDD_DREG

20

PD7

19

PD6

18

PD5

17

PE13

32

PE12

31

PE11

30

PE10

29

IOVDD

28

PF2

27

PF1

26

PF0

25

NRST

9

PB11

10

AVDD

11

PB13

12

PB14

13

IOVDD

14

AVDD

15

PD4

16

VSS/EPAD

0

C8

1.0uF

C7
10uF

C6 0.1uF

24MHz

U3

XTAL1

1

GND2XTAL2

3

GND

4

SDA

SCL

VMCU

C17

0.1uF

U6

Si7021

GND

2

VDD

5

SCL

6

SDA

1

NC

3

NC

4

SDA

SCL

INT

+5V

VMCU

U5

2SWLFDO Sensor

LED2

6

LED3

7

GND

8

LED1

9

LEDA

10

DNC

1

SDA

2

SCL

3

VDD

4

INT#

5

C16

0.1uF

Figure 10 shows the Si7021 RH and temperature sensor as well as the Si1147-M01 optical sensor.

Figure 11 shows the BLE module and LEDs.

Figure 9. EFM32G210 MCU

Figure 10. Sensors

Rev. 1.0 9

Sensor Puck

RED

GREEN

VMCU

G

R

D1

598-8410-207CF

R14
2K

R13

2K

BLE_TX

BLE_RX

BLE_WAKE

HOST_WAKE

BLE_RESET

VMCU

BCM20732i
BLUETOOTH LE

BCM20732i

U1

DNC

1

GND

2

VBAT

3

GND4GND

5

RSTb

27

WAKE MODULE

39

SCL

21

SDA

22

EEPROMWP

25

HOST UART_TX

35

PRGM UART_TX

19

Prgm UART_RX

18

GND6GND7GND8GND

9

DNC

10

GND11GND12GND13GND14GND15GND16GND17GND20GND23GND24GND28GND29GND38GND45GND46GND47GND

48

DNC

44

DNC

43

DNC

42

DNC

37

DNC

34

DNC

33

DNC

32

DNC

31

DNC

30

DNC

26

WAKE HOST

40

RESET

41

HOST UART_RX

36

TPV1

TPV6

TPV5

R4 10K

TPV2

C1

0.1uF

R5 10K

R3 10K

5.2. Bill of Materials

Figure 11. BLE Module and LEDs

Table 1. Sensor Puck BOM

Quantity Reference Value Voltage T ol Manufacturer

Part Number

1 BH1 20 mm BATTERY

BAT-HLD-001

HOLDER

1 C1 0.1 µF 16 V ±10% C0402X7R160-

104K

8 C2,C3,C4,C5,C6,C11

, C16,C17

0.1 µF 10 V ±10% C0402X7R100­104K

1 C7 10 µF 6.3 V ±20% C0603X5R6R3-

106M

1 C8 1.0 µF 6.3 V ±10% C0402X5R6R3-

105K

2 C9,C10 10 pF 50 V ±5% C0402C0G500-

100J

2 C12,C13 47 µF 6.3 V ±20% C0805X5R6R3-

476M
1 D1 598-8410-207CF 598-8410-207CF Dialight
1 J1 Header 2x5 TH M50-3500542 Harwin

Manufacturer

LINX TECHNOLO­GIES INC.

Venkel

Venkel

Venkel

Venkel

Venkel

Venkel

1 L1 47 µH ±20% NR 3012T 470M Taiyo Yuden
3 R3,R4,R5 10 K ±1% CR0402-16W-

10 Rev. 1.0

3 R8,R9,R10 4.99 K ±1% CR0402-16W-

Venkel

1002F

Venkel

4991F

Table 1. Sensor Puck BOM (Continued)

Sensor Puck

Quantity Reference Value Voltage T ol Manufacturer

Part Number

1 R11 47 ±1% CR0402-16W-

47R0F

2 R13,R14 2 K ±1% CR0402-16W-

2001F
4 SF4,SF5,SF6,SF7 BUMPER SJ61A6 3M
1 SW1 SW_SLIDE_2POS NK236H Apem Inc.
4 TPV1,TPV2,TPV5,TPV6TPV N/A N/A

2 TP1,TP2 RED 151-207-RC Kobiconn
1 U1 BCM20732i 3.3 V BCM20732i iDevices
1 U2 EFM32G210 3.3 V EFM32G210F12

8-QFN32

1U3 24MHz FA-238

24.0000MB

1 U4 TS3310 5 V TS3310ITD1022 SiLabs

Manufacturer

Venkel

Venkel

SiLabs

Epson

1 U5 Optical Sensor Si1147-M01-GM SiLabs
1 U6 Si7021 Si7021-A10-GM1 SiLabs

5.3. Layout

Figure 12 shows the layout of the puck. The Bluetooth module has a keep and area and is placed on the backside
to avoid antenna detuning. The inner power and ground layers are not shown.

Figure 12. Silkscreen, Front and Back Metal

Rev. 1.0 11

Sensor Puck

6. Sensor Puck Firmware

No firmware download is necessary to use the puck as it comes preprogrammed with firmware, but the capability to
view and modify the firmware source code is available in Simplicity Studio.

It is possible to download, debug, and even modify this code within Simp licity Studio, however, to connect the puck
to Studio you will need two additional pieces of hardware. First, a standard 9-pin Arm Cortex debug cable is
required (not supplied). This cable can be ordered from Segger (see the link below).

http://segger.com/jlink-adapters-9pin-cortexm.html

Secondly, an EFM32 development kit with a 20-pin debug out header, such as the Zero Gecko STK, is required
(also not supplied). The cable connects the 20-pin debug out header on the EFM32 development kit to the 9-pin
debug header on the puck (J1).

Steps to program the firmware of the Sensor Puck:

 Install and launch the latest version of Simplicity Studio (www.silabs.com/simplicity).
 Connect the 20-pin header of the programming/debug cable to the EFM32 development kit.
 Connect the 9-pin header of the programming debug cable to the Sensor Puck.
 Slide Sensor Puck power switch to ‘ON’.
 Select DBG mode on the power switch of the EFM32 development kit.
 Connect a USB cable from PC to EFM32 Development kit J-Link connector.
 If the EFM32 development kit is not connected automatically, select ‘Detect Connected Device’.
 Once the kit is recognized, select the tile ‘Kit Manager’ shown below to configure the development kit to debug

out mode.

Figure 13. Simplicity Studio Launch Screen

12 Rev. 1.0

Next, set the debug mode to ‘Out’ in the dialog shown below.

Sensor Puck

To use the development kit subsequently without the puck, it is necessary to revert this setting before
disconnecting the puck.

To open the source code in Simplicity Studio, launch the Software Examples wizard by clicking on the Software
Examples tile (see Figure 13). Then select Sensor_Puck as the kit. Click ‘Next’ and select the sensor_puck source
code.

This will load the source code in the Silicon Labs IDE where it can then be viewed, edited, compiled, and
downloaded from within Simplicity Studio. The details of doing this are beyond the scope of this document.

Note: Sensor Puck is planned to be supported in V3.0 of Simplicity Studio. Prior to V3.0, the source code will be provided at

www.silabs.com/sensor-puck

instead of the Software Examples wizard.

. To load the project into Simplicity Studio, use the steps in the readme document in this link

Figure 14. Kit Manager Dialog

Rev. 1.0 13

Smart.
Connected.
Energy-Friendly.

Products

www.silabs.com/products

Disclaimer

Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using
or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and
"Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to
make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the
included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses
granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent
of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant
personal injury or death. Silicon Laboratories products are not designed or authorized for military applications. Silicon Laboratories products shall under no circumstances be used in
weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.

Trademark Information

Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®,
EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®,
ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, T elegesis, the Telegesis Logo®, USBXpress® and others are trademarks or registered trademarks of Silicon Laborato­ries Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand
names mentioned herein are trademarks of their respective holders.

Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
USA

Quality

www.silabs.com/quality

Support and Community

community.silabs.com

http://www.silabs.com

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Silicon Laboratories:
SENSOR-PUCK