MSP432E401Y: High current consumption in hibernate mode

Federico Chiodaroli

Part Number: MSP432E401Y

Hi,
I'm facing an issue on MSP432E410Y hibernation:
if the VDD supply is removed the microcontroller is supposed to enter in hibernation mode with a current
consumption of about 1.6uA from VBAT, as described in the datasheet.
I followed the instructions listed in the reference manual, chapter 6.3.12:
CLK32EN and RTCEN are set to 1, hence i would expect that microcontroller enters in the hibernate mode when the VDD
supply is removed and leaves it when the supply is applied again. However, what I've seen is that if I remove the VDD
the microcontroller shows a current consumption of about 100uA from VBAT instead of 1.6. From this, I suppose that the part is not in hibernate, is it?
Another weird fact is that the voltage measured on the HIB pin in this condition is 1V, not VBAT or 0.
This does not happen if I trig the hibernation using the HIBREQ bit in the HIBCTL register.
What am I doing wrong?

Thanks

over 4 years ago

0 Dennis Lehman over 4 years ago

TI__Guru 70586 points

Hi Federico,

First, are you sure you are setting the following bits:

In the user's guide, it shows several different circuit topologies. How is your's configured? Do you have a schematic or diagram that you can share?

Can you also share your code for configuring the Hibernation?

0 Federico Chiodaroli over 4 years ago in reply to Dennis Lehman

Prodigy 10 points

Hi Dennis,

I tried every combination of those bits with the same result.

Here below the code I'm actually using and a draft of my configuration.

                //Enable rtc peripheral
                HWREG(HIB_CTL) |= HIB_CTL_CLK32EN;

                while((HWREG(HIB_CTL)&0x80000000) == 0);

                /* Enable the RTC. */
                HWREG(HIB_CTL) |= HIB_CTL_RTCEN;

                while((HWREG(HIB_CTL)&0x80000000) == 0);


                //write seconds to rtc peripheral
                HWREG(HIB_LOCK) = HIB_UNLOCK_CODE;

                while((HWREG(HIB_CTL)&0x80000000) == 0);
                
                HWREG(HIB_RTCLD) = Var_CurrTime;

                while((HWREG(HIB_CTL)&0x80000000) == 0);
                
                HWREG(HIB_LOCK) = HIB_LOCK_CODE;

                while((HWREG(HIB_CTL)&0x80000000) == 0);

0 Dennis Lehman over 4 years ago in reply to Federico Chiodaroli

TI__Guru 70586 points

Hi Federico,

I did find this posting that might help us determine what your issue might be. I'm digging into it.

0 Dennis Lehman over 4 years ago in reply to Dennis Lehman

TI__Guru 70586 points

Hi Federico,

Unfortunately, I have come up empty handed on a solution for you.

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MSP432E401Y: High current consumption in hibernate mode