5.3

APPLICATION SCHEMATIC

Figure 5-3 shows the schematic for the RN2903 PICtail™/PICtail Plus Daughter Board.

FIGURE 5-3:

PICTAIL™/PICTAIL PLUS DAUGHTER BOARD SCHEMATIC

+3V3

Current measure points

+3V3_M

GND

GND

GND

GND

Module_RX

Module_TX

Module_CTS

Module_RTS

+3V3_M

+3V3_M

GND

GND

GND

+3V3

+3V3

GND

GND

GND

GND

+3V3

+3V3

+3V3

GND

GND

Module_RX

Module_CTS

+3V3

GND

+3V3

GND

CUR1

CUR2

1

2

3

X

4

5

ID D+ D-+5V

GND

USB

LD1

Green

LD2

Green

D1

B0520LW-7-F

0603

0R

JP1

0603

0R

JP2

0603

0R

JP3

0603

0R

JP4

GND

PICTail

Pin 2.54 mm right angle (PBC14DBDN)

i

50 Ohm

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

J1

Socket 1.27 mm

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

J2

Socket 1.27 mm

+3V3_ext1

+3V3_ext2

1

0603

1%

R1

Vout

4

Pgd

5

EN

1

Vout

Pgd

EN

Vin

2

IC1

MCP1825-3302E/DC

GP0

GP1

GP2

GP3

GP4

GP5

GP6

GP7

GP8

GP9

GP10

GP11

GP12

GP13

PICTail Plus

RA2/AN2/C2IN+/Vref-

1

RA3/AN3/C1IN+/VREF+

2

RA4/C1OUT/SRQ/T0CKI

3

RA5/AN4/C2OUT/SRNQ/HLVDIN/SS

4

RA7/OSC1/CLKI

6

RA6/OSC2/CLKO

7

RC0/SOSCO/T1CKI/T3CKI/T3G/IOCC0

8

RC1/CCP2/SOSCI/IOCC1

9

RC2/AN14/CTPLS/CCP1/P1A/IOCC2

10

VUSB

11

D-

12

D+

13

RC6/AN18/TX/CK/IOCC6

14

RC7/RX/DT/SDO/IOCC7

15

Vss

Vdd

17

RB0/AN12/SRI/FLT0/SDI/SDA/INT0

18

RB1/AN10/C12IN3-/P1C/SCK/SCL/INT1

19

RB2/AN8/CTED1/P1B/INT2

20

RB3/AN9/C12IN2-/CTED2/CCP2/SDO

21

RB4/AN11/P1D/IOCB4

22

RB5/AN13/T1G/T3CKI/IOCB5

23

RB6/IOCB6/PGC

24

RB7/IOCB7/PGD

25

MCLR/VPP/RE3

26

RA0/AN0/C12IN0-

27

RA1/AN1/C12IN1-

28

EP

29

5,16

RA2/AN2/C2IN+/Vref-

RA3/AN3/C1IN+/VREF+

RA4/C1OUT/SRQ/T0CKI

RA5/AN4/C2OUT/SRNQ/HLVDIN/SS

RA7/OSC1/CLKI

RA6/OSC2/CLKO

RC0/SOSCO/T1CKI/T3CKI/T3G/IOCC0

RC1/CCP2/SOSCI/IOCC1

RC2/AN14/CTPLS/CCP1/P1A/IOCC2

VUSB

D-

D+

RC6/AN18/TX/CK/IOCC6

RC7/RX/DT/SDO/IOCC7

Vss

Vdd

RB0/AN12/SRI/FLT0/SDI/SDA/INT0

RB1/AN10/C12IN3-/P1C/SCK/SCL/INT1

RB2/AN8/CTED1/P1B/INT2

RB3/AN9/C12IN2-/CTED2/CCP2/SDO

RB4/AN11/P1D/IOCB4

RB5/AN13/T1G/T3CKI/IOCB5

RB6/IOCB6/PGC

RB7/IOCB7/PGD

MCLR/VPP/RE3

RA0/AN0/C12IN0-

RA1/AN1/C12IN1-

EP

IC2

PIC18LF25K50-I/ML

Module_RX

Module_TX

Module_CTS

Module_RTS

GND

+3V3

GND

GND

JP_RST

PT+_SENSE

IC2_MCLR

Insert a short on this jumper to keep IC2 in reset state

GND

USB_D+

USB_D-

25V

0603

100nF

C4

25V

0603

470nF

C2

25V

0603

1uF

C1

25V

0603

1uF

C3

6.3V

0603

10uF

C5

50V

0603

10nF

C6

6.3V

0603

4.7uF

C8

4.7k

0603

1%

R8

220

0603

1%

R9

220

0603

1%

R10

220

0603

1%

R4

220

0603

1%

R5

220

0603

1%

R6

+5V_USB

USB_DET

+5V_D

1.5k

0603

1%

R2

100

0603

1%

R7

2.7k

0603

1%

R3

ICSP_IC2

Pin 2.54 mm

1

2

3

4

5

6

TEST

GND

+3V3

+3V3

while plugged in PICtail Plus socket

RFH

SMA

GND

1

UART_RTS

2

UART_CTS

3

RESERVED

4

RESERVED

5

UART_TX

6

UART_RX

7

GND

8

GND

11

VDD

12

NC

15

NC

16

NC

17

NC

18

NC

19

GND

20

GND

28

NC

29

TEST0

30

TEST1

31

RESET

32

GND

33

VDD

34

GPIO0

35

GND

41

NC

42

GND

47

GND

UART_RTS

UART_CTS

RESERVED

RESERVED

UART_TX

UART_RX

GND

GND

VDD

NC

NC

NC

NC

NC

GND

GND

NC

TEST0

TEST1

RESET

GND

VDD

GPIO0

GND

NC

GND

GPIO1

36

GPIO2

37

GPIO3

38

GPIO4

39

GPIO5

40

GPIO6

43

GPIO7

44

GPIO8

45

GPIO9

46

GPIO11

13

GPIO10

14

GPIO12

10

GPIO13

9

U1

RN2903

Note:

Shaded components are not populated by default.