Appendix A

Schematics

Figure 8. Board schematic (power supply and JTAG connector)

<Power Supply>

C49

100nF

12

L3

INDUCTOR2

BEAD

D5

LED-1

C41

10nF

R38

1k

C39

100nF

+

C40

33uF

12

L1

BEAD

C5

100nF

1

2

R6 22

1

2

R12 22

1

2

R8

1.5K

E

B

C

Q1

E

B

C

Q2

1

2

R22

36k

1

2

R23

10k

1

2

R24

1K

1

2

R25

47k

1

2

R26

180

D1

LED-1

1

2

R27

0R0 NC

12

L4

BEAD

1 I/O1

2 GND

3 I/O2

4

I/O2

5

VBUS

6

I/O1

U8

USBLC6-2

1

VBUS

2

D-

3

D+

4

ID

5

GND

J7

Mini TypeB

U4

LD1117

+

C3

10uF

12

L6

BEAD

VCC_USB

VCC_USB

A_VDD

USBDM

USBDP

VCC_USB

UC_VDD

UC_VDD

USB_DISC

MIC_VDD

3.3V

UC_VDD

<JTAG>

1

2

R2

10K

1

2

R3

10K

1

2

R4

10K

1

2

R15

10K

1

2

3

4

5

6

7

8

9

10

J2

5X2_HEADER

1

2

JP3

JP

UC_VDD

UC_VDD

JTMS

STM32_I2S_BICK

STM32_I2S_LRCK

NRST

JTCK

JRST