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TDx01D485

2013.12.04-A/1

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FEATURES

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Two-port electrical isolation input and

output

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Integrated isolated DC/DC converter

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Bus protection

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Isolation voltage 2.5KVDC

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Operating temperature range:-40℃~+85℃

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Baud rate 9600bps,

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Connect up to 32 nodes on one bus

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Low electromagnetic radiation

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High electromagnetic immunity

GENERAL DESCRIPTION

TD301D485/TD501D485

series

are

transceiver

isolation

module with integrated duplex power isolation, electrical

isolation,and RS-485 interface bus protector ; Products can

be easily embedded in the user equipment, achieve function

of

RS-485 network connection.

The isolation RS-485 circuits of using a piece of power

isolation

module,

three

light

couplings

and

RS-485

transceivers and device are only need to adopt a RS485

isolation module now. Simplify the customers on the isolation

requirements of the design.

SINGLE LOW RATE RS485

ISOLATION TRANSCEIVER MODULE

——TD301D485（3.3V Power supply）

TD501D485（5.0V Power supply）

RoHS

PART NUMBER SYSTEM

TD301D 485

Port

ignal type

Package

Channel number

Power distribution output

Power input

Digital bus product type

s

type

SELECTION GUIDE

Model

Power Input

TD301D485

3.17V~3.45V

TD501D485

4.75V~5.25V

ELECTRICAL CHARACTERISTICS

Input Parameters Of Power

Supply

Static current

TD501D485

≤30 mA,TD301D485≤40mA

Send current

TD501D485

≤40 mA,TD301D485≤60mA

power dissipation

≤0.2W

Input Parameters

Serial interface

TD501D485 compatible with + 5 V UART interface

TD301D485 compatible with + 3.3 V UART interface

Pin current

Output Parameters

485 bus interface

Standard interface RS485 ,pull-up and pull-down resistor, whose value is

4.7K,have been set to A/B line.

TRANSMISSION SPECIFICATIONS

Data Rate

Maximum 9600bps bps

Data Delay

The delay time from the receiving data switch to the send data : 30

μs(min), 100 μs(max).

The number of nodes

Connect up to 32 nodes on one bus

Transceiver control

Contrary to common 485 transceiver control level

Truth Table

Sending Status

Control

Input

Output

CON

TXD

A

B

Line state

0

1

1

0

Normal

0

0

0

1

Normal

Receiving Status

Control

Input

Output

CON

A-B

RXD

1

0.2V

1

1

-0.2V

0

ISOLATION SPECIFICATIONS

Electrical Isolation

Two-port isolation (input and output)

Isolation Voltage

2.5KVDC(Tested for 1 minute and leakage current < 5mA,humidity < 95%)