TUSB1310A: Power sequence of VDD1P8 and VDD1P1

Katsu Matsunaga

Part Number: TUSB1310A

Hello,

I would like to confirm a power sequence of VDD1P8 and VDD1P1.

Only figure 4-1 Power-up and reset timing shows the power sequence without description.

Could you tell me the sequence these power supply?

It seems that VDD1P1 doesn't turn on before VDD1P8 power up. is it correct?

application note doesn't say about power sequence.

Best regards,

Katsu

0 Brian Zhou over 5 years ago

VDD1P1 should be start up at least 500us earlier than 1.8v/3.3v.

ramp time for all 3 supplies should be close.

0 Katsu Matsunaga over 5 years ago in reply to Brian Zhou

Hi Brian-san,

Let me confirm about figure 4-1 in datasheet.

It seems that the VDD1P1 turn on after VDD1P8 power up. Could you please confirm this point?

If VDD1P8 and VDD1P1 can be power on at the same time, customer easy to design.

Best regards,

Katsu

0 Brian Zhou over 5 years ago in reply to Katsu Matsunaga

datasheet is not correct. VDD1p1 can not power up late than 1p8. it may fine if they up at the same time.

Is this new design? his product is RNDA

0 Katsu Matsunaga over 5 years ago in reply to Brian Zhou

Hi Brian-san,

Thank you for the confirmation.

My customer is doing revise the system, they know the status of NRND. They would like to confirmation of old design.

Best regards,

Katsu

0 Brian Zhou over 5 years ago in reply to Katsu Matsunaga

Interface forum