TPS65084: TPS650842 SWB2 Leakage issue

Expert 2725 points

Hugo Liu

Part Number: TPS65084

Hi Sir,

Our customer use the TPS650842 for Intel Braswell Platform.

But they are found out system in sleep or shut down SWB2 have 1V ~1.8V level,

The SLP_S3 status is Low.

Could you please get me some suggest for this issue?

Hugo

Expert 2725 points

Hugo Liu
- Dec 4, 2018 7:56 AM
Hi Sir,

Our customer need add the discharge on schematic.

Hugo
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Intellectual 2465 points

Nick Jakse49
- Dec 5, 2018 12:41 AM
In reply to Hugo Liu:
Hugo,

Sorry for the delay. Did adding the discharge fix your customer's issue?

Thank you,
Nick Jakse
--------------------------------------------------
Find the right power solution for your processor or FPGA. Visit www.ti.com/SoCPower today!
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Expert 2725 points

Hugo Liu
- Dec 7, 2018 11:41 AM
In reply to Nick Jakse49:
Hi Nick,

Yes, if adding discharge can be fix this issue.
But Our customer this version PCB no discharge function.
If VCC1P8_S always Leakage, any risk to affect CPU?

Hugo
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Intellectual 2465 points

Nick Jakse49
- Dec 7, 2018 2:00 PM
In reply to Hugo Liu:
Hugo,

I think if the voltage looks clean after the leakage issue is fixed, then it should be fine.

If it is possible for you to communicate with the PMIC before turning on SWB2, then you could also enable the internal discharge resistor for SWB2 using the SWB2_DIS field in the DISCHCNT3 register.

Thank you,
Nick Jakse
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Find the right power solution for your processor or FPGA. Visit www.ti.com/SoCPower today!
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Expert 2725 points

Hugo Liu
- Dec 10, 2018 7:12 AM
In reply to Nick Jakse49:

Hi Nick,

May I double check with you, So try to setting 100 or 200 or can be improve this issue?

Hugo
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Intellectual 2465 points

Nick Jakse49
- Dec 10, 2018 2:49 PM
In reply to Hugo Liu:
Hugo,

Yes, either of those settings should help.

Thank you,
Nick Jakse
--------------------------------------------------
Find the right power solution for your processor or FPGA. Visit www.ti.com/SoCPower today!
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TPS65084: TPS650842 SWB2 Leakage issue

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