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820-02016 - 5v and 0.04a

Palhano

Palhano

Member
Still learning about the power sequence of M1 boards.

The board is perfect, no oxidation.

PPBUS_AON - 12v
PP3V8_AON - 3.8v

I only have voltage on the CD3217 that has a charger. Is this normal for this board model? Not to show voltage on both chips together?
PP1V5_UPC0_LDO_CORE - 1.5v
PP3V3_UPC0_LDO - 3.3v
PP1V5_UPC1_LDO_CORE - 1.5v
PP3V3_UPC1_LDO - 3.3v
PP3V3_S2_UPC - 0 (diode mode 0.480)
 
Palhano

Palhano

Member
Used it for one day, the next day it didn't turn on anymore.

I compared the U8100 and U7700 LDOs in diode mode, everything is normal!

Doesn't recognize it in DFU mode.
 
Palhano

Palhano

Member
Correct me if I'm wrong. I'm using pages 29 and 34 to see the LDOs of the U8100 and U7700.

The only line that has voltage is PP1V5_VLDOINT_MPMU - 1.5v

The others, no voltage.
 
2informaticos

2informaticos

Administrator
Staff member
"PP1V5_VLDOINT_MPMU"
It is an input voltage!

Once U8100 gets PP3V8_AON_VDDMAIN, it should generate corresponding LDOs.
Some of them are not used (NC marked).
 
Palhano

Palhano

Member
Perfect. I understand better now.

I only have voltage in one line. In diode mode, all with good values.

U7700
PP0V72_S2_VDD_LOW - 0
PP1V2_AWAKE_PLL - 0
CAP_PPSPMU_VLDO9 - 0
PP0V855_S2SW_CIO - 0
PP0V805_S1_VDD_FIXED - 0
PP1V2_S2_CIO - 0

U8100
PP1V2_S2 - 0
PP3V3_S2_UPC - 0
PP1V8_AON_MPMU - 1.8v
MPMU_VREF_ADC - 0
 
Palhano

Palhano

Member
Yes, I checked all the LDO lines in diode mode, all with good values, comparing with the data I have in flexBV!

I don't have another board to remove the U8100. The customer will replace the board.

Thanks again for the tips!
 
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