DS50PCI402 about nPRSNT

NAOKI AOYAMA

Guru 11215 points

Other Parts Discussed in Thread: DS50PCI402

Hello,

Our customer uses the DS50PCI402 with SMBus Mode, has question.

When the customer write a register, how should he bias for nPRSNT pin?

Is it High or Low or either?

Regards,

Naoki Aoyama

over 8 years ago

0 Elias Villegas M. over 8 years ago

TI__Guru* 76130 points

Moving to High Speed Interface

0 Lee Sledjeski over 8 years ago

TI__Mastermind 43795 points

Hi Naoki,

I prefer to bias the nPRSNT pin "Low" on the external pin. This gives normal operation of the DS50PCI402. If there is some system or application condition which requires the device to go into low power mode, this pin can be overridden and controlled with SMBus registers.

Regards,

Lee

0 NAOKI AOYAMA over 8 years ago in reply to Lee Sledjeski

Guru 11215 points

Hi Lee,

Thank you for your fast reply.

The customer cannot understand the mention of the datasheet P6.
It is mentioned
' If PRSNT is asserted while ENSMB is high, the registers retain their current state. ' .

( I think PRSNT is typo, it is nPRSNT. So, asserted is Low. )
The customer wants to know, is it possible to write a register when the nPRSNT is Low.

Regards,

Naoki Aoyama

0 Lee Sledjeski over 8 years ago in reply to NAOKI AOYAMA

TI__Mastermind 43795 points

Hi Naoki,

It is possible to read and write registers with nPRSNT = Low or High. When nPRSNT = High and the DS50PCI402 is in a low power mode the register will not be "reset" to default values. They will retain any values written during configuration by the customer.

Regards,

Lee

0 NAOKI AOYAMA over 8 years ago in reply to Lee Sledjeski

Guru 11215 points

Hi Lee,

Thank you for your reply.
I will feedback the customer this information.

Thanks,

Naoki Aoyama

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DS50PCI402 about nPRSNT