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DM8148 Board with TPS659113 issue

Andy Friedl
Prodigy 100 points

Hi.

I made myself an DM8148 board with the TPS659113 PMIC (the design is close to the EvalBoard from Mistral) and I now have an issue with the PMIC as when I'm not connecting VCC_ARM and VCC_DSP (coming out of the SW1 and SW2 of the PMIC) all voltages are very fine (VIO from SWIO at 1.8V, VCC_CPUCORE at 1.2V made with the switcher controller of the PMIC) - all voltages from the LDO's are fine too and the 32kHz is clocked out.

But if I close the connection to apply VCC_ARM and VCC_DSP to the DM8148 the voltages of all the three switcher goes to zero volt, but the switcher controller and the LDO's are still running - the 32kHz output is zero too (the external crystal is swinging).

Did anyone have a suggestion what I could do here ? What could be wrong?

Thanks, Andy