iC-DX

UNIVERSAL DIGITAL SENSOR OUTPUT DRIVER

Rev C1, Page 8/9

CIRCUIT PROTECTION

The iC-DX is reverse polarity protected via internal

circutry. As far as the maximum voltage ratings are not

exceeded, no possible supply combination at the line

side pins (VB, GND and OUT) can damage the chip.

Since the chip current consumption is relatively low,

discharging of the backup capacitor C1 can be very

slow, and injected charge through disturbances may

in general result in capacitor voltage exceeding maxi-

mum ratings, leading to malfunction or destruction of

circuitry and associated parts.

Thus EMC require-

ments will afford more external circuitry.

Figure 9

shows the iC-DX with the additional protective device

D1, D2 and D3.

For over-voltage protection, the suppressor diodes

D1,D2 and D3 absorbs transients on supply line in-

jected externally on the cable. Clamp voltage of the

diodes should be rated slightly above maximum speci-

fied supply voltage.

These currents can be passed to ground or to VB

by the internal ESD diodes of the iC-DX. Whereas

negative current injection will simply be drained off to

ground, positive current injection will charge capacitor

C1 further to higher voltages. If not suppressor diodes

nor any other over-voltage protection is implemented,

the backup capacitor C1 should be kept small. A typi-

cal 100nF value is normally OK.

Suggested protective devices

voltage from 36V has to be chosen in order to minimize

the energie in iC-DX for higer Voltages. For example

Diode type like Vishay GSOT36C or PJSD36W from

Pan Jit should be enough as protection.

Figure 9: Circuit schematic showing protective de-

vices

REVISION HISTORY

Rel

Rel.Date

Chapter

Modification

Page

A3

28.04.11

preliminary release

Rel

Rel.Date

Chapter

Modification

Page

B1

19.06.13

ABSOLUTE MAXIMUM RATINGS

Parameter G004 introduced

4

Rel

Rel.Date

Chapter

Modification

Page

C1

03.12.14

preliminary label on front page removed

1

THERMAL DATA

parameter T02 value Rthja introduced

4

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