TPS65070 sequence

masaya hagiwara

Intellectual 740 points

Other Parts Discussed in Thread: TPS65070

I have a question about TPS65070.

Customer doing this one.

1st, PB_IN 1msec with Low status ,

2nd, PB_IN with High status.0830.TPS65070-sequence.pptx

but this device power sequence didn't start after this step.

(Question)

How many time need for DCDC Power start　after The input signal of the Low to PB＿IN？

over 10 years ago

0 Michael Green over 10 years ago

TI__Genius 16870 points

On page 9 of the datasheet, PB_IN debounce time is specified as 50 ms +/- 15%. For details please see the PB_IN sections of the datasheet on page 9 and 34-35.

This feature is meant to be a push button, hence the longer debounce time.

0 masaya hagiwara over 10 years ago in reply to Michael Green

Intellectual 740 points

Are you sure you want an input 42.5msec Low status to PB_IN?

I want to know min time　Low status to PB_IN.

0 Michael Green over 10 years ago in reply to masaya hagiwara

TI__Genius 16870 points

Masaya,

You have asked this question several times now. See below responses...

http://e2e.ti.com/support/power_management/pmu/f/200/p/325697/1138200.aspx#1138200

http://e2e.ti.com/support/power_management/pmu/f/200/p/326386/1137355.aspx#1137355

The timing diagram is described in the datasheet on page 76. The debounce time is 50 ms + or - 15%. The DCDCs automatically power up as described by the datasheet.

Please buy an EVM if you need to tinker with it in the lab. Please note that the TPS65070 is a part of a family, the TPS6507x. Not all parts in the family have the same automatic timing sequence. So, verify that you are working with the TPS65070 and not another part.

0 masaya hagiwara over 10 years ago in reply to Michael Green

Intellectual 740 points

Customer circuit is below.
1.POWER_ON is pull-up with VSYS.
2.BAT supply battery.
3.AC and USB not use.

In this case , even if PB_IN isn't LOW between the 50ms , does DCDC AND LODs sequence start?

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TPS65070 sequence