SP502 데이터 시트보기 (PDF) - Signal Processing Technologies

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SP502

Multi–Mode Serial Transceiver

Signal Processing Technologies 

MODE: RS-485

DRIVER

RECEIVER

TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0

0

1

0

1

0

1

0

1

RD(a) 70

RxD 1

RD(b) 71

RT(a) 37

RxC 20

RT(b) 38

CS(a) 66

CTS 80

CS(b) 67

DM(a) 68

DSR 78

DM (b) 69

RR(a) 35

DCD 19

RR(b) 36

IC(a) 39

RI 21

IC(b) 40

RxT 79

14 TxD

61 SD(a)

59 SD(b)

13 DTR

58 TR(a)

56 TR(b)

16 RTS

54 RS(a)

52 RS(b)

17 RL

47 RL(a)

45 RL(b)

24 LL

51 LL(a)

49 LL(b)

15 TxC

42 ST(a)

44 ST(b)

6 ST/TT

63 TT(a)

65 TT(b)

ST/TT

1

0

ST

Enabled

Disabled

TT

Disabled

Enabled

RxT*

Active

Inactive

* TT driver must be disabled to allow TT(a) and TT(b)

to serve as receiver inputs.

* When the RxT receiver is active, TT(a) and TT(b) act

as receiver inputs. When the RxT receiver is inactive,

it cannot serve as a receiver since its inputs are internally

connected to the TT(a) and TT(b) driver outputs.

Figure 11. Mode Diagram — RS-485

Rev. 7/21/03

SP502 Multi-Mode Serial Transceiver

18

© Copyright 2003 Sipex Corporation

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