Datasheet > AN460

AN460

更新时间： 2022-11-25 11:11:24

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
8页	68K
描述
Using the P82B96 for bus interface

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AN460 数据手册

Philips Semiconductors

Application note

Using the P82B96 for bus interface

AN460

Low speed applications can include: Driving remote displays,

GALVANIC BUS ISOLATION

In Figure 4 the Tx and Rx signals are shown interfaced via

opto-couplers to provide galvanic separation.

security systems, access control systems, data logging, remote

control of appliances or lighting. Isolation can simply be included in

I C systems at any point on the bus where safety isolation or ground

This simple circuit can use general purpose 4N36 opto-couplers

having published switching times around 50µs for the load

impedances shown. That will limit the design bus clock speed to

around 5kHz. Simple circuits like this can probably reach 20kHz by

changing the type of opto-coupler or the circuit values.

potential differences require it.

Figure 5 shows how faster opto-couplers can be applied to achieve

full 100kHz clock speed.

CC1

I2C

SDA

+5 V

(SDA)

I C

SDA

(SDA)

1/2 P82B96

This example shows the simplicity of a low speed application.

For example:

R1 = usual I C pull–up

R3 = 680 W

R2 = 10 KW

R4 = 2.2 KW

= 5 V

R5 = 2.2 KW

CC1

= 5 V

SU01022

Figure 4. Galvanic isolation of I C nodes via opto-couplers

+5 V

6N137

x 2

+5 V

*0.1 mF

2K2

560

USUAL I C

PULL-UP

USUAL I C

PULL-UP

I C

SDA

I C

SDA

(SDA)

*0.1 mF

1/2 P82B96

2N2907

*NOTE: 6N137 data recommends 0.1 mF mounted between pins 5 and 8

SU01015

Figure 5. Opto-isolation of I C nodes via 6N137 for 100 kHz operation

2001 Feb 14

1 234 5 6 7 8

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