IntroductionThe STEVAL-BLUEPLUG1 evaluation board for home-automation and IoT (internet of things) applications is designed to helpyou develop your own home or building automation subsystems for energy management, in a small form factor solution for easyintegration into home and building electrical systems.

The board is compliant with Bluetooth Low Energy (BLE) specification 4.2 to allow secure communication of metering data fromspecific electrical loads to a smart phone with BLE support.

You can use an Android application for your smart phone to display energy measurement parameters and send dimming andscheduling commands to the Smart Plug board.

This board embeds an STPM32 metering chip for high accuracy measurement of power and energy in power line systems usingshunt current sensors, and a non-isolated buck converter supply based on the VIPER06Xs. A three-terminal TRIAC controls thecurrent through AC switching.

You can also interface the board with NFC enabled EEPROM via a dedicated connector.

Figure 1. STEVAL-BLUEPLUG1 evaluation board - top and bottom

How to use the STEVAL-BLUEPLUG1 evaluation board for home automation smart plugs

UM2395

User manual

UM2395 - Rev 1 - May 2018For further information contact your local STMicroelectronics sales office.

www.st.com

1 Safety information

FCC notices

Note: ST reference designs and evaluation boards are intended to help and facilitate development of products. Usinga direct copy of any of them does not waive the requirement for testing and certification of products mandated bygoverning agencies and authorities.This device compiles with part 15 of the FCC Rules. Operation is subject to the following two conditions:1. This device may not cause harmful interference2. This device must accept any interference received, including interference that may cause undesired

operation.

Electrical safety

Danger:Due to the high voltage present on the non-isolated components, special care must be taken toavoid the risk of electric shocks and burns.There are no protections against accidental human contact with high voltage components.Never touch live board components when the board is connected or immediately after the board isdisconnected, as the capacitors may still be charged.Do not connect probes to any high voltage components if the board is not isolated from the mainssupply, as this may cause damage to equipment.

1. The board must be used only by qualified persons.2. De-energize the board and all its interface outputs and electrical loads before performing any electrical or

diagnostic operations.3. Only program and debug the board with the isolated JTAG in-circuit debugger/programmer to avoid

damaging the tools.4. Use a mains insulation transformer when you perform any tests with spectrum analyzers or oscilloscopes.

Note: STMicroelectronics assumes no responsibility for accidents or injury caused by improper use of thisdevelopment tool.

Personal safety

1. Wear personal protective equipment such as latex gloves or safety glasses with side shields, or protect theEVM in an adequate lucent plastic box with interlocks from accidental touch.

UM2395Safety information

UM2395 - Rev 1 page 2/22

2 Overview

2.1 Features

• Smart Energy Meter design with wireless connectivity• BLE (Bluetooth Low Energy) v4.2 connectivity for control and metering panel: Smart-phone connectivity for

energy consumption dashboard, control of appliances• Dimming: Some loads can be controlled. For example, AC Induction fan speed, Heaters, Incandescent

lamps• Scheduling: Set the time of day for ON or OFF of the load• NFC interface: To configure the design, store the logs (connector for adapter board)• Rated voltage: 240 VAC (typ.)• Rated current: 12 A (typ.)• Power consumption of plug: 1.6 W (max.)• Instantaneous and averaged power• RMS and instantaneous voltage and current• Radio certifications:

– FCC certified: S9NSPBTLE1S– IC certified: 8976C-SPBTLE1S

• CE certified• RoHS and China RoHS compliant

2.2 Typical applications• Control and monitoring of energy parameters using BLE.• Smart metering• Home automation• Smart lighting

UM2395Overview

UM2395 - Rev 1 page 3/22

2.3 Board architecture

Figure 2. STEVAL-BLUEPLUG1 featured components

3

2

1

5

4

6

1. BTA12-800BWRG (12 A TRIAC)2. STPM32 (IC for metering applications)3. SPBTLE-1S (Bluetooth Low Energy v4.2 module)4. VIPER06 (30 KHz offline converter)5. STTH110RL (High voltage ultrafast rectifier)6. L4931 (very low drop voltage regulator)

Figure 3. STEVAL-BLUEPLUG1 block diagram

UART

SWD

GPIOs

Vdd I2C

STPM32

UARTTxRx

M24LR

I2CSDA

VIPER06 L4931

SWD

Debugger

OPTO

BTA12

230 VAC

Phase_in Neutral_in Phase_out Neutral_out

IIN

Zero Crossing Circuit

LEDs Switch

STEVAL-BLUEPLUG1

230 VAC

Inductive or resistive LOAD

3.3V

Vdd

3.3V

Vdd

3.3V

Voltage DividerCircuit

VIPVIN

Shunt

VIPerPLUS

SCK

ST25

IIPSmart Plug APP

STBTLE-1S SCL

o p t i o n a l

UM2395Board

architecture

UM2395 - Rev 1 page 4/22

The mains supply and loads are monitored by the STPM32 standard metering IC, while the SPBTLE-1S BluetoothLow Energy module handles data and command interfacing for the Smart Plug Android app developed for theboard, and can store data via the EEPROM connector.The 12 A TRIAC acts as a switch for the load and phase controller for dimming.The supplies for the ICs are regulated from the VIPER06 buck converter output.The board includes a manual switch to turn the load on and off, and LEDs to signal connectivity status.

2.4 Zero crossing detector circuitA zero crossing circuit is an electrical circuit that begins operation with the AC load voltage at close to 0 V in theAC cycle. Zero crossing detection is used for the dimming reference point to fire the TRIAC accordingly.The circuit has three resistors connected to phase of the AC line to lower the resultant voltage and a resistor onthe base of a PNP transistor which acts as a pull up resistor: when the voltage at the base drops below the baseoperating voltage, the transistor switches to output LOW.

Figure 4. Zero crossing detector circuit

R54

270K

DIO6_ZCR

10K

3V3

R53

GND

PHASE

270K

2N3906

R37

R51

10k

270K

Q3R52

The purpose of the circuit in our design is to start the TRIAC conducting very near the moment when the loadvoltage crosses zero volts (at the beginning or the middle of each AC cycle represented by a sine wave), so thatthe output voltage can be modified by changing the firing angle of TRIAC, which in turn will change the requiredoutput waveform.

UM2395Zero crossing detector circuit

UM2395 - Rev 1 page 5/22

Figure 5. Zero crossing detection with oscilloscope

3

2

1

Note: 1. AC voltage2. Output of the transistor3. Output of the transistor goes low as ac voltage approaches zero

Figure 6. AC at 50% phase

2

1

Note: 1. AC voltage2. TRIAC Output at 50% duty cycle

2.5 Power supplyFor power supply, a non-isolated Buck converter using the VIPER06Xs offline converter is used, with PWMoperation at 30 kHz and frequency jittering for lower EMI. Standby power is very low, at < 30 mW.This type of supply is ideal for the Smart Plug application, where large currents are not required, but a small formfactor is necessary.

UM2395Power supply

UM2395 - Rev 1 page 6/22

Figure 7. Non-isolated buck converter

1

RR3322

RR3344

PP__IINN

NEUT

RAL

VD

D2

DD11

GND 7JJ11

RR1111

11..55uuFF 2255VV

SSMMAA

DD22

2277nnFF,,2255vv

CC4444

LIM

3CCOONN22

CC4466

5V

CC1177

116600kk

11..55uuFF,,440000VV

LL111100EE,,11WW

GND

RR1100

MMOOVV

5V

CC1188

UU22

5

11..11mmHH

LL44993311

NN__IINN

SSTTTTHH111100RRLL

PHAS

E

GND

CO

MP

7

GN

D1

110000nn

FF,,1166

VV

INHIBIT

6GNDGND

77..55KK

22..22uuFF,,5500VV

CC4499

8822kk

3V3

333300uuff 1100vv

VVIIPPEERR 0066XXSS

JJ1100

GND

JJ1133

RRVV11

DR

AIN

10

DO NOT MOUNT J10, J13

DD44SSTTTTHH111100RRLL

NC4

11..55uuFF,,440000VV

CC4455

8CC3366

1

12

VOUT

GND2

GND3

DR

AIN

9

PHASE

NEUTRAL

FB4

5V

RR11

UU66

LL66

DR

AIN

6D

RA

IN

GNDD

RA

IN

8VIN

CC3344

220000nnFF,,2255VV

1

5

REGULATOR

55..11kk

447700uuHH

The output of supply is set to 4.3 V, which is further regulated by the L4931 LDO to 3.3 V and 500 mA, to powerall the analog and digital sections.

UM2395Power supply

UM2395 - Rev 1 page 7/22

3 Set up the board and connect with the Android app

Warning:Before performing this task, please review all the safety procedures and precautions associatedwith high voltage electrical circuits, and prepare the necessary protection equipment.

Use the procedure below to set up the board.

Step 1. On the evaluation board, connect the input mains and output load connectors.Input mains connectors:– P_IN (J10)– N_IN (J13)

Load connectors:– P_OUT (J11)– N_OUT (J12)

Figure 8. Phase (P) and neutral (N) input (IN) and output (OUT) connectors

3

2

1

5

4

6

P_IN P_OUT N_OUT N_IN

J10 J11 J12 J13

Step 2. After powering up the board, RED LED (LD3) will indicate that the board is turned ON.Step 3. Install the SmartPlug.apk Android app from the release package and launch it.

Figure 9. Smart Plug launch screen

Step 4. Search for the device on your smart phone by selecting the [Plugs found] icon.Step 5. Connect the device to the App by selecting the Smart_Plug_NRG1 device.

Once connected with the board, the BLUE LED (LD2) will blink at the frequency of 2 Hz.

UM2395Set up the board and connect

with the Android app

UM2395 - Rev 1 page 8/22

3.1 Control a load with the deviceFollow the instructions below to control a load with the STEVAL-BLUEPLUG1 board and the Smart Plug app.

Step 1. Connect the board to a mains supply and a load, such as a light bulb.Step 2. Select the load type; i.e., [Light Bulb] for this example.

Figure 10. Smart Plug - load type panel

Step 3. Control the light bulb and view the parameters in the load control panel.– select the bulb image to turn it on or off– use the slider to control dimming

Note: LED lights are not particularly suitable to evaluate the dimming function.

UM2395Control a load with the

device

UM2395 - Rev 1 page 9/22

Figure 11. Smart Plug - load control panel

UM2395Control a load with the

device

UM2395 - Rev 1 page 10/22

4 State machine

Figure 12. State machine

YES

NO

YES

NO

Start

Initialization of module and peripherals

BLE Stack initialization

BLE Stack Tick

Interruptfrom SW3?

Turn ON/OFF load

Connectedto App?

Receivecommands

Dimming/ scheduling ofthe bulb (load)

sendmetering

parameters

initial routines

state machine routines

interrupt routines

The following events occur in the state machine figured above:1. The peripherals are initialized, including:

– USART for STPM– the timer for firing the TRIAC– I2C for the NFC/RFID EEPROM– GPIOs and System Clock.

2. In the RUN state, the API constantly checks for data packets from the BLE device.3. Metering interrupts are performed at 1 Hz, and the data is sent to the BLE device, according to the user

settings.4. An interrupt updates the data packet.5. The TRIAC is fired according to the data packet.

UM2395State machine

UM2395 - Rev 1 page 11/22

5 Schematic diagrams

Figure 13. STEVAL-BLUEPLUG1 schematic - SPBTLE-1S

RR4444

SSWW33

DIO14_LED2

5 VCC

LLDD33

DIO5_I2C_EEPROM_SDA

3V3

CC5500

DIO1_SPI_STPM_SCS

DIO3_LED1

GND DIOA12_LOAD_SW

SPI_CS/DIO1

6110000nnFF,,1166VV

00EERR4466

SWTD

IO

123

DIO

7_BO

OT

GND

US

AR

T_R

XD

/DIO

11

DIOA12_LOAD_SW

222200

I2C_CLK/DIO4

ADC_IN2

3

SSPPBBTTLLEE--11SSA

NT_

TES

T0/D

IO14

110000nnFF,,1166VV

7

UU88

SSWW PPUUSSHHBBUUTTTTOONN

DIO

7/B

OO

T/U

SA

RT-

CTS

9

CC4477

12TC

K/S

WTC

K

1322

GN

D23

SWTC

K

DIO

11_U

ART_

RXD

4

DIO3_LED1

TMS

/SW

TDI 16SPI_MOSI/DIO2

17

RR44551100KK

DIO

6/U

SA

RT-

RTS

10

GND

1

DO NOT MOUNT E1

DIOA12

GND

NRST

DIO0_OPTO_PWM15SPI_CLK/DIO0

GN

D8

DIO7_BOOT

21

AN

T SSPPBBTTLLEE--11SS

RR4433

DIO

14_L

ED2

UUFFLL

LLEEDD

19BT_RESET

20

DIO2_STPM_SYN

3V3

DIO4_I2C_EEPROM_SCL

EE11

GN

D14

AN

ATE

ST1

DIO

8_UA

RT_T

XD

DIO

6_ZC

R

SPI_MISO/DIO3

18

222200

LLDD22LLEEDD

I2C_SDA/DIO5

US

AR

T_TX

D/D

IO8

11

ADC_IN1

2

Figure 14. STEVAL-BLUEPLUG1 schematic - STPM32

21

SC

L22

1100nnFF,,2255VV

1100KK

11550000 OOHHMM

SSTTPPMM3322TTRR

11KK

11KKRR2255

15

VIP

1

9

LLDD00

115500ppFF,,5500VV

RR1199

RR2222

RR1133 LED1_B

44..77uuFF,,2255VV

DIO2_STPM_SYN

20

SC

S

110000nnFF,,1166VV

YY11

4 LED1

23

NEUTRAL RR2277

3V3_

EN

RR88

110000nnFF,,1166VV

LLEEDD

115500ppFF,,5500VV

3V3 3V3_EN

115500ppFF,,5500VV

115500ppFF,,5500VV

LL44

CC88

2222nnFF,,2255VV

3V3DIO1_SPI_STPM_SCS

DIO11_UART_RXD

RR2266

00

44..77KK

110000nnFF,,1166VV

RR1177

2222KK

LED2_B

MO

SI/R

XD

110000nnFF,,1166VV

10

IIN1

11

VIN

1100KK

227700KK

11550000 OOHHMM

RR2200

11uuFF,,2255VV2200ppFF,,5500VV

IIN

115500ppFF,,5500VV

RR2211

IIN

115500ppFF,,5500VV

17

16

SShhuunntt

VIN

1

IIP1

CC1111 115500ppFF,,5500VV

115500ppFF,,5500VV

CLKOUT/ZCR

2

CC1144

CC2222

110000nnFF,,1166VV

RR1188

CLKIN/XTAL2

3

SSTTPPMM3322

CC66CC77

IIP

11550000 OOHHMM

11uuFF,,2255VV

VCC

IIPNEUTRAL_IN

XTAL1

GNDD 181CC1100

RR2244

CC55

CC2211

LLDD11 LLEEDD

VDDA

110000EE

13

CC1122

VD

DD

19

CC2244

8

CC3311

CC44

227700KK

2200ppFF,,5500VV

RR55

CC2200

CC3322

5

1100KK

24M

ISO

/TX

D

110000EE

RR1166

11MMEE

CC33

CC1155

NEUTRAL

VR

EF1

12

RR2233

CC3300

INT1

EN

7

1100nnFF,,2255VV

PHASE

44..77KK

UU11

3V3

CC2299

LED2

VIP

VIN

CC119914

CC2288

25G

ND

_EX

LL33

115500ppFF,,5500VV

DIO8_UART_TXD

11550000 OOHHMM

LED1_B

GND_REG

6

LL55

447700

1100KK

RR1155

LL22

RR77

227700KK

VIP

GND_REF

GNDA

RR66

SY

N

CC99

1166MM

HHzz

LED2_B

UM2395Schematic diagrams

UM2395 - Rev 1 page 12/22

Figure 15. STEVAL-BLUEPLUG1 schematic - Viper power supply

1

RR3322

RR3344

PP__IINN

NEUT

RAL

VD

D2

DD11

GND 7JJ11

RR1111

11..55uuFF 2255VV

SSMMAA

DD22

2277nnFF,,2255vv

CC4444

LIM

3CCOONN22

CC4466

5V

CC1177

116600kk

11..55uuFF,,440000VV

LL111100EE,,11WW

GND

RR1100

MMOOVV

5V

CC1188

UU22

5

11..11mmHH

LL44993311

NN__IINN

SSTTTTHH111100RRLL

PHAS

E

GND

CO

MP

7

GN

D1

110000nn

FF,,1166

VV

INHIBIT

6GNDGND

77..55KK

22..22uuFF,,5500VV

CC4499

8822kk

3V3

333300uuff 1100vv

VVIIPPEERR 0066XXSS

JJ1100

GND

JJ1133

RRVV11

DR

AIN

10

DO NOT MOUNT J10, J13

DD44SSTTTTHH111100RRLL

NC4

11..55uuFF,,440000VV

CC4455

8CC3366

1

12

VOUT

GND2

GND3

DR

AIN

9

PHASE

NEUTRAL

FB4

5V

RR11

UU66

LL66

DR

AIN

6D

RA

IN

GNDD

RA

IN

8VIN

CC3344

220000nnFF,,2255VV

1

5

REGULATOR

55..11kk

447700uuHH

Figure 16. STEVAL-BLUEPLUG1 schematic - Snubberless TRIAC section

R33220

2

PHASE

1J11

J12

3

2STR12151

6

1

N_OUT

R35

333300

1

R28

1

NEUTRAL_IN

100P_OUT

33V3

DIO0_OPTO_PWM

2

BTA12-800BWRG

RR33991100KK

Q2

DO NOT MOUNT J11, J12

2

MOC3020 4

Q1U5

R38

11KK

Figure 17. STEVAL-BLUEPLUG1 schematic - ZCD

R54

270K

DIO6_ZCR

10K

3V3

R53

GND

PHASE

270K

2N3906

R37

R51

10k

270K

Q3R52

UM2395Schematic diagrams

UM2395 - Rev 1 page 13/22

Figure 18. STEVAL-BLUEPLUG1 schematic - SWD

3V3 SWTDIO

8

4 SWTCK6

107

RR44001100KK

3V3

JJ662

5

1

CCOONN1100AA

9 NRST

3

Figure 19. STEVAL-BLUEPLUG1 schematic - M24LR dual EEPROM

EEPROM_EN 3V3

DIO5_I2C_EEPROM_SDA

EEPROM_ENGND

3V3

DIO4_I2C_EEPROM_SCL

J7

CONN

1234

R604.7K

R420E

R554.7K

UM2395Schematic diagrams

UM2395 - Rev 1 page 14/22

6 Bill of materials

Table 1. STEVAL-BLUEPLUG1 bill of materials

Item Qt.y Ref. Part/Value Description Manufacturer Order code

1 1 U1 -

ASSP for meteringapplications with upto four independent

24-bit 2nd ordersigma-delta ADC

ST STPM32TR

2 1 U2 - Voltage Regulator ST L4931CD33-TR

3 1 U6 -Energy saving 4W

high voltageconverter

ST VIPER06XS

4 1 U8 -

Very low powermodule for

Bluetooth Smartv4.2

ST SPBTLE-1S

5 1 D2,D4 -High voltage

ultrafast rectifierdiode

ST STTH110RL

6 1 Q1 -12 A standard and

Snubberless™TRIACS

ST BTA12-800BWRG

7 1 Q2 40 V, 0.8 A NPN bipolartransistor ST 2STR1215

8 1 Q3 - PNP bipolartransistor ST 2STR2160

9 1 Y1 - CRYSTAL 16.000MHZ 20pF ECS Inc. ECS-160-20-23A-EN-TR

10 1 C3,C32 10nF 25V CAP CER Kemet C0603C103F3GACTU

11 1C4,C7,C8,C9,C11,C15,C19,

C24,C31

150pF 50V±5% CAP CER Taiyo Yuden UMK105CG151JV-F

12 1C5,C10,C18,C20,C29,C30,C

47,C50100nF 16V CAP CER Yageo CC0402KRX7R7BB104

13 1 C14,C21 1µF 25V CAP CER X5R0603 Taiyo Yuden TMK107BJ105KA-T

14 1 C34,C36 1.5µF 400V AluminumCapacitors Radial Nichicon ULD2G1R5MED1TD

15 1 C49 0.22µF 25V CAP CER X7R0805

Samsung Electro-Mechanics America,

Inc.CL21B224KAFNNNG

16 1 C12,C22 20pF 50V CAP CER Murata ElectronicsNorth America GRM1555C1H200JA01D

17 1 C17 2.2µF 35V CAP CER X5R0402 TDK Corporation C1005X5R1V225K050BC

18 1 C44 1.5µF 25V CAP CER X7R0805 TDK Corporation C2012X7R1E155M125A

C

19 1 C45 0.027µF 25V CAP CER X8R0805 Kemet C0805C273K3HACTU

20 1 C28 22nF 25V CAP CER Kemet C0603C223J3RACTU

UM2395Bill of materials

UM2395 - Rev 1 page 15/22

Item Qt.y Ref. Part/Value Description Manufacturer Order code

21 1 C46 330µF 10V±20% CAP ALUM SMD Nichicon UUR1A331MNL1GS

22 1 C6 4.7uF 25V±10%

Multilayer CeramicCapacitors MLCC -

SMD/SMT 0603X5R

Murata Electronics GRM188R61E475KE11D

23 1 D1 2KV 1A DIODE GEN PURP2KV 1A Bourns Inc. CD214A-R12000

24 1 LD0,LD3 - LED RED CLEAR Lite-On Inc. LTST-C191KRKT

25 1 LD2 - LED BLUE CLEARVishay

SemiconductorOpto Division

VLMB1310-GS08

26 1 LD1 - LED GREENCLEAR Lite-On Inc. LTST-C191KGKT

27 1 RV1 470V 6KADISC 14MM VARISTOR EPCOS (TDK) B72214P2301K101

28 1 R5,R6,R7,R15,R39,R40,R45

10K Ω 1/10W±1% RES Vishay Dale RCG060310K0FKEA

29 1 R8,R20, R35 100 Ω 3 W±5% RES Yageo PNP300JR-73-100R

30 1 R1 - Fuse Resistor LittelFuse 650-2410SFV050FM1252

31 1 R13 1.0M Ω 1/10W±1% RES KOA Speer RK73H1ETTP1004F

32 1 R11 82K Ω 1/16W±5% RES SMD 0402 Yageo RC0402JR-0782KL

33 1 R32 7.5K Ω 1/4W RES SMD 0805WIDE RΩ Semiconductor LTR10EZPJ752

34 1 R10 160K Ω 1/16W±1% RES SMD 0402 Yageo RC0402FR-07160KL

35 1 R55,R60 4.7K Ω 1/5W±5% RES SMD Yageo Dale RCS04024K70JNED

36 1 R17,R18,R19,R37,R52,R54 270K miniMELF resistor Vishay Beyschlag MMA02040C2703FB300

37 1 R21, R42 0.0 Ω RES Yageo RC0402JR-070RL

38 1 R23 470 Ω ±1%1W SMD 0207 Vishay Beyschlag MMB02070C4700FB200

39 1 R24 22K Ω 1/10W±5% RES SMD 0603

PanasonicElectronic

ComponentsERJ-3GEYJ223V

40 1 R25,R27,R38 RES 1K Ω 1%1/10W RES Yageo RC0603FR-071KL

41 1 R26 0.004 Ω 3W±1% RES SMD 4527 Vishay Dale WSR34L000FEA

42 1 R28 330 Ω ±5% RES SMDPanasonicElectronic

ComponentsERG-3SJ331

43 1 R33,R43,R44 220 Ω 1/10W±5% RES SMD

PanasonicElectronic

ComponentsERJ-2GEJ221X

44 1 R34 5K Ω 0.15W±0.1% RES SMD 0603 Vishay Thin Film PNM0603E5001BST5

UM2395Bill of materials

UM2395 - Rev 1 page 16/22

Item Qt.y Ref. Part/Value Description Manufacturer Order code

45 1 R51,R53 10K Ω 1%1/16W RES SMD 0402 Yageo RC0402JR-0710KL

46 1 R16,R22 4.7K Ω 5%1/4W RES SMD RΩ Semiconductor ESR03EZPJ472

47 1 R46 0.0Ω 1/10W RES SMD JUMPER0603 Yageo RC0603JR-070RL

48 1 L1 470µH 170MA5.6 Ω FIXED IND EPCOS (TDK) B82462A4474K000

49 1 L2,L3,L4,L5 1.5 KΩ FERRITE BEAD0603 1LN TDK Corporation MMZ1608Y152BTA00

50 1 L6 1.2MH FIXED WURTHZ -

51 1 SW3 -SWITCH TACTILESPST-NO 0.05A

12V

PanasonicElectronic

ComponentsEVQ-5PN04K

52 1 J1 -2 PIN

CONNECTOR2.54MM

Harwin Inc. M20-9990246

53 1 J10 , J11 ,J12 , J13 -

1 PINCONNECTOR forexternal Supply,2.54mm Pitch

Not mounted -

54 1 J6 -

10 Positions HeaderConnector 0.050"(1.27mm) Through

Hole Gold

CNC Tech 3220-10-0100-00

55 1 J7 -4 PIN

CONNECTOR2.54MM

Amphenol FCI 68002-404HLF

56 1 U5 -PhotocouplerTRIAC Driver

OutputLite-On Inc MOC3020S

57 1 Heat Sink forQ1 -

Dimension isH*W*D is 20*16*12

(mm)- -

58 1 E1 - Do not mount Not mounted -

UM2395Bill of materials

UM2395 - Rev 1 page 17/22

Revision history

Table 2. Document revision history

Date Version Changes

02-May-2018 1 Initial release.

UM2395

UM2395 - Rev 1 page 18/22

Contents

1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Typical applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.3 Board architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.4 Zero crossing detector circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.5 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Set up the board and connect with the Android app . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3.1 Control a load with the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 State machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

5 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

6 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

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List of figuresFigure 1. STEVAL-BLUEPLUG1 evaluation board - top and bottom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Figure 2. STEVAL-BLUEPLUG1 featured components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Figure 3. STEVAL-BLUEPLUG1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Figure 4. Zero crossing detector circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 5. Zero crossing detection with oscilloscope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 6. AC at 50% phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 7. Non-isolated buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 8. Phase (P) and neutral (N) input (IN) and output (OUT) connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 9. Smart Plug launch screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 10. Smart Plug - load type panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 11. Smart Plug - load control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 12. State machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Figure 13. STEVAL-BLUEPLUG1 schematic - SPBTLE-1S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 14. STEVAL-BLUEPLUG1 schematic - STPM32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Figure 15. STEVAL-BLUEPLUG1 schematic - Viper power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 16. STEVAL-BLUEPLUG1 schematic - Snubberless TRIAC section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 17. STEVAL-BLUEPLUG1 schematic - ZCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Figure 18. STEVAL-BLUEPLUG1 schematic - SWD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Figure 19. STEVAL-BLUEPLUG1 schematic - M24LR dual EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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List of tablesTable 1. STEVAL-BLUEPLUG1 bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Table 2. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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