Post Go back to editing

How turn on SIMO voltage in the first start without nEN input?

Category: Hardware
Product Number: MAX77650

We need to connect the MAX77650 to the Audio DSP, which is powered from the SIMO line(V Sbb0 = 1.2 V).

When the battery is first connected, MAX77650 is in STANDBY state and does not generate voltage to SIMO (V Sbb0 = 0 V).

That means, we cannot turn on Audio DSP. We need to wake up the MAX77650 chip from sleep.

We also cannot install a button or slide switch to nEN.

So, how we can solve this problem?