Hi, I have a question with regard to the nPM1100 PMIC and entering ship mode (not exiting it).
If I am interpreting the datasheet correctly, the SHPHLD pin must be held HIGH prior to activating ship mode via SHPACT (correct me if I am wrong). The reference schematic in section 7.1 of the datasheet shows SHPHLD connected to VBAT via a 100k resistor and a switch connected to GND to pull it LOW when pressed.
In my scenario (no MCU involved) I want to be able to enter ship mode at the press of a button that sets SHPACT to HIGH (by connecting VSYS?), however, I don't need the switch with SHPHLD as I can exit ship mode bby connecting VBUS (the USB cable).
My questions are,
1. If I don't need the switch on SHPHLD, do I just connect SHPHLD directly to VBAT?
2. Do I still need the 100k resistor? Is there a significance to this value? The nPM1100 EK board uses two 10k resistors in series instead.
3. Under normal operation, isn't holding SHPHLD constantly HIGH, connected to VBAT, wasting battery life on the off-chance one needs to press the switch on SHPACT to enter ship mode?
4. If (3) is a yes, is there possibly another way to achieve entering ship mode by setting SHPHLD HIGH right before setting SHPACT HIGH?
Just to re-iterate, in my implementation no MCU is involved.
Thank you for your answers in advance