MAX3160(2000) Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX3160
(Rev.:2000)

+3.0V to +5.5V, 1µA, RS-232/RS-485/422 Multiprotocol Transceivers

Maxim Integrated 

+3.0V to+5.5V, 1µA, RS-232/RS-485/422

Multiprotocol Transceivers

MAX 3160-2 FIG10

SHDN

5V/division

T1OUT

2V/div

GND

MAX 3160-2 FIG12

TIN

TOUT

5V/div

T2OUT

2V/div

ROUT

40µs/div

Figure 10. MAX3160 RS-232 Transmitter Outputs when Exiting

Shutdown

VCC

CBYPASS

VCC

C1+

V+

C1

C3

C1-

C2+

MAX3160

V-

C2

MAX3161

C4

C2-

MAX3162

T_ IN

T_ OUT

1µs/div

Figure 12. RS-232 Loopback Test Result at 250kbps, FAST =

Low

MAX 3160-2 FIG13

TIN

TOUT

200ns/div

5V/div

ROUT

R_ OUT

R_ IN

Figure 13. RS-232 Loopback Test Result at 1000kbps, FAST =

High

5kΩ

VCC

SHDN

GND

1000pF

Figure 11. Loopback Test Circuit

RS-485/422 Line Length vs. Data Length

The RS-485/422 standard covers line lengths up to

4000 feet. For line lengths greater than 4000 feet, use

the repeater application shown in Figure 14.

RS-232/RS-485 Protocol Translator

Figure 15 shows the MAX3162 configured as an RS-

232/RS-485 protocol translator. The direction of transla-

tion is controlled through the RTS signal (R1IN). The

single-ended RS-232 receiver input signal is translated

to a differential RS-485 transmitter output. Similarly, a

differential RS-485 receiver input signal is translated to

a single-ended RS-232 transmitter output. RS-232 data

received on R2IN is transmitted as an RS-485 signal on

Z and Y. RS-485 signals received on A and B are trans-

mitted as an RS-232 signal on T1OUT.

Multiprotocol Bus

The Typical Operating Circuit shows a standard appli-

cation for the MAX3160. The MAX3160’s output pins

are multiplexed between RS-232 and RS-485 protocols

by a microprocessor (µP). The µP also directs the shut-

down functions, enable lines, and the duplex of the

MAX3160. Data is transmitted to the MAX3100 UART

through an SPI™ port. The UART asynchronously

transfers data through the MAX3160 to the pin-selected

RS-232 or RS-485 protocol; see Table 14 for commonly

used cable connections.

SPI is a trademark of Motorola, Inc.

______________________________________________________________________________________ 19

Share Link: