Serial Communications Module

For Evaluation Kits

____________________________________________________________________

11

JP1

2 x 8 FEMALE

HEADER

P1

RA2

RA1

RA0

OSC1

OSC2

RB7

RB6

RB5

RB4

MA2YD15

2.2k

Ω

RA3

U1

PIC16LF628

(TSSOP)

MAX3223

(SSOP)

U2

RA4

RB0

RB1

RB2

RB3

C1+

0.1

µF

0.1

µF

1

µF

1

µF

FORCEOFF

FORCEON

GND

T1OUT

R1IN

T1IN

T2IN

R1OUT

1

µF

C2+

C2-

C1-

V+

V-

T2OUT

R2IN

R2OUT

EN

1.0

µF

0.1

µF

27pF

27pF

4.7k

Ω

4.7k

Ω

CTX501

CT2192MST

CRYSTAL

3.68MHz

JP3

1

6

7

8

9

2

3

4

5

DB9

MCLR

P2

P3

P4

P5

GND

GND

(N.C.) RESET

P11-SDA

P10-SCL

GND

P8

P7

P9

P6

JP2

2 x 8 FEMALE

HEADER

INVALID

Figure 2. DS3900 Schematic