Maxim USBTO232 quick start USB-to-COM Port AdapterBoardUserGuide

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USBTO232

Figure 28. USBTO232 Schematic

USB-to-COM Port AdapterBoardUserGuide

VCC

P2

DB9 TYPE DTE

P1

VCC

DTR

1

T3OUT

T4OUT

28

DCD

P2-1

USB TYPE B

FB1

TXDATA

2

T1OUT

R3IN

27

CTS

RXDATA

P2-2

P1-1

JU1

VCC30

3

26

C1

1

2

3

RTS

T2OUT

R3OUT

CTS#

TXDATA

P2-3

0.01∝F

4

RXDATA

4

R2IN

SHDN

25

SLEEP#

16

VCCI0

RXD 5

5

24

VCC

DTR

P2-4

P1-2

USBDM

R2OUT

U2

EN

C2

3

6

23

P2-5

47pF

RTS#

T2IN

MAX213

R4IN

RI

P1-3

15

USBDP

TXD

1

7

T1IN

R4OUT

22

RI#

DSR

P2-6

C3

U1

DSR#

9

8

R1OUT

T4IN

21

RTS

P2-7

47pF

FT232RL

P1-4

8

N.C.

VCC

H1

DSR

9

R1IN

T3IN

20

DTR#

20

HEADER 8 PIN

VCC

CTS

P2-8

24

N.C.

VCC

C12

H1-1

11

VCC

R5OUT

DCD#

RI

P2-9

0.1∝F

C4

C10

R5IN

18

DCD

27

OSCI

CBUS0

0.1∝F

1∝F

CBUS0

23

H1-2

13

V+

V-

17

28

CBUS1

12

C6

OSCO

CBUS1

22

H1-3

C5

C1+

C2-

16

0.1∝F

12

CBUS2

0.1∝F

14

C7

SLEEP#

CBUS4

C1-

0.1∝F

13

15

CBUS2

H1-4

10

C2+

GND

10

CBUS3

DCD#

DCD#

CBUS3 14

H1-5

RI#

6

RI#

VCC30

VCC

VCC30

3V3OUT

17

H1-6

CTS#

11

CTS#

C11

0.1∝F

RESET#

R1

R2

2

19

DTR#

DTR#

RESET#

H1-7

270Ω

270Ω

VCC

AGND GND GND GND TEST

H1-8

D1

D2

25

7

18

21

26

CBUS0

1

2

3

3

2

1

CBUS1

C8

C9

JU2

JU3

0.1∝F

4.7∝F

30