2004-01-27

Page 9

BTS 4880 R

Truth table for common diagnostic pin ( LED-driver ):

Input

level

Output

level

Diagnostic

Normal

operation

L

H

L

H

L

L

Short circuit

to GND

L

H

L

L

L

L

Undervoltage

L

H

L

L

L

L

Overtemperature

L

H

L

L

L

L = no diagnostic output current

H = diagnostic output current typ. 2 mA (see page 7)

Programmable input:

Logic

LS

Input

Level Shifter

IN

GND

typ . 800 k

Ω

Functional description LS-Pin:

With using the LS-pin it is possible to change the input turn-on and -off threshold voltage

between CMOS and half supply voltage level.

Therefore you have either to connect the LS-pin to GND ( state 1 ) or to supply voltage ( state 2 ).

If the LS-pin is not connected the input threshold voltages are automatically at CMOS level,

caused by an internal pull down to GND with typ. 800k

State 1: LS-Pin to GND

CMOS - Input level

State 2: LS-Pin to supply voltage

Vbb/2 - Input level

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