Project Description: Pebble Time Smartstrapeet.etec.wwu.edu/AlexTyler/project/schematic/EE492Portfolio2.pdf · metric) smd rc0603jr-07470rl 1 r2 68.1kΩ 68.1k 0.1w 5% 0603 (1608 metric)

Project Description:

Pebble Time Smartstrap Alexander Jamshedi

Tyler Johnson

Western Washington University

EE class of 2016

Table of Contents 1. Design Change Form……………………………………………………………………...1

2. Schematic Documents

a. Battery Regulation Schematic………………...…………………………………...2

b. Heart Rate Monitor Schematic…………………………………………………….3

c. MCU Schematic…………………………………………………………………...4

3. Board Layout

a. Battery Regulation. Top copper layer…………………………………………......5

b. Battery Regulation. Bottom copper layer…………………………………………6

c. Heart Rate Monitor. Top copper layer…………………………………………….7

d. Heart Rate Monitor. Bottom copper layer………………………………………...8

e. MCU. Top copper layer…………………………………………………………...9

f. MCU. Bottom copper layer………………………………………………………10

4. Complete BOM

a. Battery Regulation BOM…..…………………………………………………….11

b. Heart Rate Monitor BOM………………………………………………………..12

c. MCU BOM………………………………………………………………………13

5. 3D Board Renderings

a. Battery Regulation 3D Rendering……..…………………………………………14

b. Heart Rate Monitor 3D Rendering………..…………………………………...…15

c. MCU 3D Rendering……………………………………………………………...16

6. 3D Design

a. Blown out view…………………………………………………………………..17

b. Side view…………………………………………………………………………17

c. End prototype design…………………………………………………………….18

7. Solder Paste Stencil

a. Battery Regulation stencil………………………………………………………..19

b. Heart Rate Monitor stencil……………………………………………………….19

c. MCU stencil……………………………………………………………………...20

8. After Reflow

a. Battery Regulation……………………………………………………………….21

b. Heart Rate Monitor………………………………………………………………21

c. MCU…………………………………………………………………………..…22

9. Board Test Procedures…………………………………………………………………...23

10. Identified Errors………………………………………………………………………….24

1

Design Change Form

Electrical Engineering

Engineering Change Description EE 492 – Project Hardware Design

Page:

___1__ of __1__

Project Name: Pebble Smartstrap Revision:1.0

Reason For Change: The original size of our

PCB we had listed in the project description

didn’t work with the design of the industrial

design (ID) students.

Source Signature Date

Originator Tyler Johnson 3/16/16

Instructor

Description of Change:

The original size of our PCB was listed as 60x20x8 𝑚𝑚3. To make this work better with the

watch strap, we split the PCB into three boards. The boards consist of a Heart rate monitor board

(24.01x13.21x5 𝑚𝑚3), battery recharge board (26.42x16.38x5 𝑚𝑚3), and a

microcontroller/pebble interface board (31.93x17.83x5 𝑚𝑚3). This allows everything to fit

comfortably around the strap with the ID student’s design.

2

Schematic Documents

3

4

5

Board Layout

Battery Regulation. Top copper layer.

6

Battery Regulation. Bottom copper layer.

7

Heart Rate Monitor. Top copper layer.

8

Heart Rate Monitor. Bottom copper layer

9

MCU. Top copper layer.

10

MCU. Bottom copper layer

11

Complete BOM

Bill of Materials Battery Regulation

Source Data From: BAT.PrjPcb

Project: BAT.PrjPcb

Variant: None

Creation Date: 2/29/2016 2:00:51 PM

Print Date: 16-Mar-16 9:25:24 PM

Production Quantity: 1

Currency USD Designator Value Description Manufacture Part Number Quantity

B1 50mAh ZIPPY50S-20C ZIPPY50S-20C 1

C1, C2 4.7uF

CAP 4.7uF 4V ±20% 0603 (1608 Metric) Thickness 0.55mm SMD

GRM188R60J475KE19 2

C3 1uF

CAP 1uF 4V ±20% 0603 (1608 Metric) Thickness 0.55mm SMD

GRM188R61C105KA93 1

C4 10uF

Polarized Capacitor (Surface Mount)

GRM188R60J106ME47 1

C5 10nF

CAP 10nF 6.3V ±10% 0606 (1608 Metric) Thickness 1mm SMD

GRM188R71H103KA01 1

D1

Silicon Switching Diode for High-Speed Switching

BAS16LT1G 1

F1 500mA

FUSE BOARD MNT 500MA 32VAC 63VDC

C2Q 500 1

J1

CONN USB MICRO B RECPT SMT R/A

10118194-0001LF 1

LED1 LED RED DIFFUSED 0603 SMD LS L29K-H1J2-1-Z 1

P1 Header, 2-Pin 1

Q1 MOSFET P-CH 55V 42A D2PAK NTR4171PT1G 1

R1 470Ω

470R 0.1W 5% 0603 (1608 Metric) SMD

RC0603JR-07470RL 1

R2 68.1KΩ

68.1K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-0768K1L 1

R3, R5, R6 0Ω Jumper 0603 (1608 Metric) RC0603FR-070RL 3

R4 100KΩ

100K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-07100KL 1

TP1, TP2, TP3, TP4

TEST POINT PC MINI .040"D BLACK

5001 4

U1

IC CONTROLLR LI-ION 4.2V SOT23-5

MCP73831T-2ACI/OT 1

U2 IC REG LDO 3.3V 0.5A 8SOIC LT1763CS8-3.3#TRPBF 1

24

12

Bill of Materials Heart Rate Monitor

Source Data From: HRM.PrjPcb

Project: HRM.PrjPcb

Variant: None




Currency USD Designator Value Description Manufacture Part Number Quantity

C1, C2 4.7uF

CAP 4.7uF 4V ±20% 0603 (1608 Metric) Thickness 0.55mm SMD

GRM188R60J475KE19 2

C3, C4 100nF


GRM188R71H104KA93 2

D1

SENSOR OPTO TRANS 4MM REFL THPCB

TCRT1000 1

LED1

LED RED DIFFUSED 0603 SMD

LS L29K-H1J2-1-Z 1

P1 Header, 4-Pin 1

Q1

MOSFET N-CH 60V 150MA SOT23-3

BS170FTA 1

R1 10KΩ

10K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-0710KL 1

R2, R5, R6 56.2KΩ

56.2K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-0756K2L 3

R3, R4 634KΩ

634K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-07634KL 2

R7, R8 4.99KΩ

4.99K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-074K99L 2

R9, R10 0Ω Jumper 0603 (1608 Metric) RC0603FR-070RL 2

U1

IC OPAMP GP RRO 1MHZ 14-SOIC

MCP6004T-I/SL 1

19

13

Bill of Materials MCU

Source Data From: MCU.PrjPcb

Project: MCU.PrjPcb

Variant: None




Currency USD

Designator Value Description Manufacture Part Number

Quantity

C1, C3, C6 100nF


GRM188R71H104KA93 3

C2, C4 1uF

CAP 1uF 6.3V ±10% 0603 (1608 Metric) Thickness 1mm SMD

GRM188R61C105KA93 2

C5 2.2uF

CAP 2.2uF 6.3V ±10% 0603 (1608 Metric) Thickness 1mm SMD

GRM188R61A225KE34 1

C7, C8 12pF

CAP 12pF 50V ±0.25pF 0603 (1608 Metric) Thickness 1mm SMD

GRM1885C1H120JA01 2

J1

10 pin 0.05" pitch header for JTAG

FTSH-105-01-L-DV-K 1

P1, P2 Header, 4-Pin 2

R1, R2 10KΩ

10K 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-0710KL 2

R3, R4 0Ω Jumper 0603 (1608 Metric) RC0603FR-070RL 2

R5 1MΩ

1M 0.1W 5% 0603 (1608 Metric) SMD

RC0603FR-071ML 1

TP1, TP2, TP3, TP4, TP5, TP6

TEST POINT PC MINI .040"D BLACK

5001 6

U1

IC MCU 32BIT 256KB FLASH 64LQFP

MKL43Z256VLH4 1

X1 32.768KHZ

CRYSTAL 32.7680KHZ 12.5PF SMD

ABS07-32.768KHZ-9-T 1

24

14

3D Board Renderings

Battery Regulation.

15

Heart Rate Monitor.

16

MCU.

17

3D Design

Blown out view.

Side view.

18

End prototype design.

19

Solder Paste Stencil

Battery Regulation Stencil. Swell specification: -2mm.

Heart Rate Monitor Stencil. Swell specification: -2mm.

20

MCU Stencil. Swell specification: -2mm.

21

After Reflow

Battery Regulation.

Heart rate Monitor.

22

MCU.

23

Board Test Procedures Heart Rate Monitor

Apply power and ground to the board

Check to make sure all places correctly have power or ground using test points

Connect the R9 0Ω resistor to connect MOSFET to the circuit

Without the MOSFET enabled, make sure the circuit is not drawing current

Connect R10 0Ω resistor to connect enable pin to MOSFET

Enable the MOSFET and make sure to check that the circuit powers

Using an oscilloscope make sure the output waveform correctly depicts a heart beat

Battery Regulation



Attach battery while powered to make sure LED is lit properly

Using DMM make sure the charge current is at the correct level

Connect R5 a 0Ω resistor to connect the voltage regulator section

Check to make sure the output voltage is at the correct level of 3.3 volts

Check to make sure while charging, the USB is supplying power to the circuit instead of

battery

MCU



Using DMM make sure there are no shorts on MCU pins

Using the JTAG add code to the MCU to make sure it is functional on development board

Interface with the Pebble to make sure information is correctly sent/received

24

Identified Errors Connections on the MCU board do not correctly match the connection pins of the Battery

Regulation board and Heart Rate Monitor board