Shutdown modes in MAX17332

Hi!

We worked with this IC in our project.

Modes behaviour is pretty nice written in datasheet in Wakeup/Shutdown section (page 56).

It will always wake up on Vsys> Vbat event (if you connect charger). 

Also you can setup wake-up on pushbutton event (page 166)

The main problem with this IC - it takes random time 20-40s to Ship/Deepship mode.

Stas

Hi!

So I was testing on the eval board and I have noticed a weird behaviour.

When I force the IC to go to the ship mode (as you had said, it takes around 20 - 40s), after a gap of around 45 - 60s, it automatically turns back to active mode (despite not connecting charger and not using any pushbutton wakeup). Do you have any idea why this might be?

Also I send the IC to ship mode using the I2C Ship Command (There is an option to do so in the eval kit GUI) . Do I need to make the I2C SCL/SDA lines collapse using the Stop Communication in the GUI as well or just the I2C Command is fine?

Thanks for your help!

Hi!

In our application I2C lines collapse due to power lose. But it is mention in datasheet that I2C communication can trigger wakeup of IC

As for 20-40s yes this is how it goes into sleep modes (we also didn't understand why AD made it like this).

As we understood it depends on the settings of FullTimer (page 73) 

Hi!

I made the SCL/SDA lines collapse and it is working just as expected (Had to stop communication because as you had suggested, that was triggering the wakeup of the IC).

For some reason, waking up the IC from the DeepShip Mode is resetting the configurations but anyways, the Ship Mode completely fulfills our requirements so are going ahead with the Ship Mode (avoiding the DeepShip Mode troubles altogether).

Thanks for your help!

As for resetting - IC has volatile and non-volatile memory for registers. By default you write to volatile memory. So after losing power IC resets registers. You may use non-volatile memory to hardwrite settings, but be careful you have like 7 attempts to do it.