TMDS181 Power On/Off Sequence

Sadanori Kato

Other Parts Discussed in Thread: TMDS181

Hi,

The power on sequence is mentioned on page 12 of the data sheet as below.
What kind of issue occurs if td1 is not satisfied ?
Moreover, could you please tell us the power off sequence which you recommend as well ?

Best regards,
Kato

over 9 years ago

0 Moises Garcia over 9 years ago

TI__Mastermind 23815 points

Hi Kato,

Don't worry about Td1, as long as you comply with td2 everything should work fine.

In most cases Vdd powers digital circuitry, that's why it has to be asserted before Vcc.

Regards

0 Sadanori Kato over 9 years ago in reply to Moises Garcia

Guru 36540 points

Hi Moises-san,

Thank you for your reply.

I have an additional question.
Does TMDS181 have the esd protection diodes between VDD and VCC ?

Best regards,
Kato

0 Moises Garcia over 9 years ago in reply to Sadanori Kato

TI__Mastermind 23815 points

Hi Kato,

ESD diodes are place in IO pins, one from GND to IO pins and another from IO pin to power supply.

There is no need for diodes between Vdd and Vcc.

Regards

0 Sadanori Kato over 9 years ago in reply to Moises Garcia

Guru 36540 points

Hi Moises-san,

Thank you for your support.

I understood about the esd protection diodes.
By the way, could you please tell me the power off sequence which you recommend ?

Best regards,
Kato

0 Moises Garcia over 9 years ago in reply to Sadanori Kato

TI__Mastermind 23815 points

Hi Kato-san,

Sure, since this devices doesn't have a required power off sequence the recommendation is to use the inverse order of power up sequence.

Regards

0 Sadanori Kato over 9 years ago in reply to Moises Garcia

Guru 36540 points

Hi Moises-san,

Thank you for your quick response.
I understood and will contact you if I obtain any questions from our customer.

Best regards,
Kato

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TMDS181 Power On/Off Sequence