BUF22821: why did buf22821 back to default (avdd/2) value?

HungLin Hsu

Part Number: BUF22821

Hi,

I don't know that how did buf22821 back to avdd/2 ?

First, our system initialized buf22821 to achieve our target for each of channels. few minutes later, all channels backed to default value(avdd/2).

I found reason that it is back to avdd/2 since signal of I2C was too duty to effect. So that, could I know how I2C can let it back to avdd/2 ?

Regards,

Hung Lin, Hsu

over 5 years ago

0 Aaron Goodson over 5 years ago

TI__Expert 6330 points

Hi,

I have notified our expert regarding this topic. Please expect a response 6/5/19.

Thanks,
Aaron

0 Costin Cazana over 5 years ago in reply to Aaron Goodson

TI__Expert 4940 points

Hi,

If DAC outputs go back to AVDD/2 after programing the DAC's, I2C has sent a reset command( address=00h followed by 06h) or the supply has a glitch resetting the part.

Regards,
Costin

0 HungLin Hsu over 5 years ago in reply to Costin Cazana

Prodigy 220 points

Hi,

Thanks for your reply.

So you meant that I2C sent command 00 & data is 06, IC will back to AVDD/2, is that right?

Regards,

Hsu Hung Lin

0 Costin Cazana over 5 years ago in reply to HungLin Hsu

TI__Expert 4940 points

Hi,

That's correct

Regards,

Costin

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BUF22821: why did buf22821 back to default (avdd/2) value?