nPM1100 ship mode

RE: nPM1100 ship mode

Bendik Heiskel — Mon, 03 Aug 2026 14:40:59 GMT

Ah, sorry about that, I misunderstood what you wanted to implement.

Tying SHPHLD high to the battery should be OK, and not lead to any increased current consumption from the battery.

Best regards,

Bendik

RE: nPM1100 ship mode

oqthm011 — Wed, 29 Jul 2026 20:18:38 GMT

Thank you for your reply but that's not what I am asking.

According to the datasheet SHPHLD must be HIGH in order to enter ship mode by setting SHPACT HIGH. It's a prerequisite. If SHPHLD is LOW when setting SHPACT HIGH then (again according to the datasheet) the NPM1100 won't enter ship mode. Makes sense?

So no, I am not going to use SHPHLD for exiting ship mode but it needs to be HIGH prior to entering ship mode via SHPACT. That's what the datasheet suggests.

So since I don't have space for a second push button (exclusively for SHPHLD) then the only other options seems to be to keep it constantly HIGH (connect it to VBAT directly).

My question simply was, does keeping SHPHLD HIGH constantly (by having it connected directly to VBAT; no resistors) waste battery?

Does that make sense?

(I believe the nPM1100 EK board also keeps SHPHLD HIGH by default (via two 10k resistors in series) and pulls it low when the button is pressed)

RE: nPM1100 ship mode

Bendik Heiskel — Wed, 29 Jul 2026 13:16:35 GMT

Hi,

If you're not going to be using the SHPHLD pin at all you can just connect it directly to GND. like in configurations 1 and 2 of the reference schematic:

Best regards,

Bendik

RE: nPM1100 ship mode

oqthm011 — Sat, 25 Jul 2026 18:29:54 GMT

Thank you for your answer.

Regarding your reply in (3), what I actually meant was that since I'll be permanently wiring SHPHLD to VBAT (without a button) won't that be wasting battery by keeping SHPHLD permanently HIGH (again without a button)?

I don't have space on my board for two switches (one for SHPACT and one for SHPHLD).

Thank you

RE: nPM1100 ship mode

Kazi Afroza Sultana — Sat, 18 Jul 2026 15:09:07 GMT

Hello,

1. '' If I don't need the switch on SHPHLD, do I just connect SHPHLD directly to VBAT?''

Yes you can just connect SHPHLD directly to VBAT.

According to datasheet, ''there are two ways to exit Ship mode. Either connect the USB (VBUS) or set SHPHLD low for a minimum period of t_shipToActive. The battery supply (VBAT) is used to hold SHPHLD high through a weak pull-up resistor when Ship mode is enabled. A circuit to pull down SHPHLD is optional (see the Button switch shown in the following figure). If no pull-down circuit is present, Ship mode is exited when VBUS is connected.

Product overview • nPM1100 Product Specification • Technical Documentation

SO, if you don't need to switch. you can just connect this pin to VBAT to keep it high.

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.

100kohm is current limiting pull up resistor. If you don't need the wake up button you can omit this part.

The 100k mentioned is the datasheet is chosen for minimizing current in a battery product. the EK hardware design focuses on having less noise over uA level current.

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?

I don't think so as BUTTON is open and in such condition SHPHLD is a high impedance input.

4. Since the number 3 answer is no. You have very straight forward approach to enter ship according to datasheet, (Product overview • nPM1100 Product Specification • Technical Documentation)

"To enter Ship mode, SHPACT must be set high for a minimum period of tactiveToShip = 200 ms when VBUS is disconnected and SHPHLD held high.''

So, to enter Ship mode, you have to follow the following steps:

1. Connect a button between SHPACT and VBAT.

2. Button should be pressed at least for 200ms.

3. When button is not pressed, internal pull down (500kohm) holds SHPACT low.

Thanks.

Kazi