S12 / MagniV MicrocontrollersのトピックRe: S12 ZVML31 no GDU Flag

S12 ZVML31 no GDU Flag

fabiansonnleitn — Tue, 06 Sep 2016 12:28:44 GMT

Hello,

I am using a S12 ZVML31 for a sensorless BLDC application. When the voltage drops down to 5.8V I do not get a GDUF error due to low voltage. Instead the signals on high side are switched with the low side for 400us.

Please find attache a scope screenshot.

purple - HD pin

blue - high side gate

yellow - low side gate

green - can be ignored

The voltage drop on HD is due to an active short on the lowside, for breaking.

Does anyone know this Problem?

all the best,

Fabian

Re: S12 ZVML31 no GDU Flag

iggi — Thu, 08 Sep 2016 12:37:13 GMT

Hi,

The GDUF register will not indicate if HD voltage drops low. It indicates if HD voltage gets high by setting GHHDF bit.

How about to measure voltage on VLS_OUT pin too? And also, to check GLVLSF bit which indicates low level of VLS voltage supply.

Regards,

iggi

Re: S12 ZVML31 no GDU Flag

fabiansonnleitn — Wed, 14 Sep 2016 14:48:19 GMT

Thank you!

did a update on

GDUCTR_GHHDLVL and
GDUCTR_GVLSLVL

now it works flawless

Re: S12 ZVML31 no GDU Flag

iggi — Thu, 15 Sep 2016 10:47:55 GMT

Nice to hear that.

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