13

Rev. 6/30/03

SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver

© Copyright 2003 Sipex Corporation

Figure 16. Circuit for the connectivity of the SP3238 with a DB-9 connector

6. DCE Ready

7. Request to Send

8. Clear to Send

9. Ring Indicator

DB-9 Connector Pins:

1. Received Line Signal Detector

2. Received Data

3. Transmitted Data

4. Data Terminal Ready

5. Signal Ground (Common)

6

7

8

9

1

2

3

4

5

DB-9

Connector

26

0.1µF

C5

+

0.1µF

0.1µF

GND

2

To µP Supervisor

Circuit

8

9

11

5kΩ

5kΩ

5kΩ

16

21

20

18

5

6

7

R

R

R

R

R

R

R

10

12

24

23

22

T

T

T

T

T

T

19

17

T

T

T

T

SP3238

28

25

3

1

27

4

C3

C4

+

+

C1+

C1-

C2+

C2-

V+

V-

0.1µF

0.1µF

+

C2

C1

+

13

14

15

ONLINE

SHUTDOWN

STATUS