Dear Support Team,
We're struggling to find a correct schematic that aims to use an ADP5350 (because it fits well our targeted battery and it embeds several LDOs).
Our concern is that our main CPU (1V8) communicates via I2C to the ADP5350 and we do not know to which poser supply voltage we could connect the I2C pull-up resistors to initiate the communication between both of them.
(1) Our main CPU embeds its own internal LDO for its VDD, an internal 1V8 that we do not have any access to it.
(2) At startup the ADP5350 starts LDO1 but its startup voltage is 3V3 so we cannot use it for the I2C pull-up resistors
QUESTIONS:
- Could any internal ADP5360 1V8 power voltage be used to pull up these I2C resistors?
- Could the boost regulator (in standalone mode?) be used to generate 1V8 immediately when the ADP5350 is powered on? I understood that the boost regulator in standalone mode is not enabled at startup.
Thanks a lot in advance for your support,
Best regards,
Thierry
