K8055 - Digital output problem // Problèmes sorties numé

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1

Hello,
I have a voltage problem on the digital outputs.
Instead of 5volt I have 0.5v!
The LED of digital outputs function normally and all other inputs / outputs are ok.

What can be the problem?

(Note: They have functioned before)

Thx!

Bonjour,
J’ai un problème de tension sur les sorties numeriques.
A la place du 5volt j’ai du 0.5v !
Les leds des sorties numériques fonctionnent normalement.
Toutes les autres entrés/sorties fonctionnent aussi.

Quel peut être le problème?

Le problème est récent avant sa fonctionné bien.

Merci !

2

Are all the eight digital outputs not working?
Maybe the transistor array IC4 has damaged.
You may check it by replacing IC4 with IC2.

Please see also these threads:
viewtopic.php?f=3&t=6602
viewtopic.php?f=3&t=2209
viewtopic.php?f=16&t=7775

3

I tried ic2 <=> IC4, no changes.
Yes all digital output.

J’ai testé, pas de changements.
Problème qui affecte toutes les sortie numériques.

4

The cause of the problem may be that the CLAMP terminal is connected to the ground (GND).

5

I have 431 ohm resistance between CLAMP and GND when the card is offline.

When it is online(connected) i have between 100 ohm and 430 ohm. it depends of the number of outputs activated

6

You may try this: Connect also the CLAMP terminal to the +5V.

7

Ok, I do not wired correctly. :blush: i test the scheme.
I had -5 volts … between Qx and CLAMP
I have NPN transistors after to digital outputs
I do not want to use PNP transistors.

Ok, je n’ai pas câblé correctement… j’ai réalisé ce montage pour tester.
J’ai du -5 volts… entre Qx et CLAMP
Aux sorties numeriques, j’ai des transistors NPN… problème !
Je ne souhaite pas utiliser des PNP.