BeagleBone Blue: LiPo battery will not power board on boot

[kedw...@swbell.net]

The board will not boot from the LiPo Battery. When I plug in the battery no LEDs turn on.

I’m using a 1.6Ah / 7.4volt 2Cell Lipo battery. The battery shows 8.4 volts with a voltmeter.

Pressing the Power Button or the Reset Button does nothing. If I plugin a 12-volt power source into the barrel jack it will boot.

Once booted the Battery Charging LED will blink. The four battery status LEDs will turn on and off in sequence for several seconds.

Then they turn on solid for several seconds. It will continue this cycle as long as no power is applied to the motor drivers.

The 25% LED is always red and the other three are always green.

If I run rc_battery_check I see:

Pack: 8.48V   Cell: 4.24V   DC Jack: 12.29V

If I run rc_test_motors -d 1.0. I can run a motor from any of the motor drivers. The Battery Charging LED will turn on solid while a motor

 is running and will go back to blinking when the motor is disconnected. The four battery status LEDs will turn off if a motor is running.

I have not found any documentation on the battery status LEDs, so I do not know what the LED's are telling me.

I left the 12-volt power source and LiPo battery plugged in over night to ensure the battery was fully charged. But it did not help.

Am I missing something? Any ideas what is going on?

Thanks,

Keith

[santh...@gmail.com]

The "TPS65217C PMIC" supports 1-cell LiPo battery (3.7V) only.

It might have damaged the PMIC IC.

http://www.ti.com/product/TPS65217

Regards,

Santosh

[Santosh]

ok, I was taking w.r.t pocketbeagle.

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[Jason Kridner]

On Friday, January 5, 2018 at 5:56:02 PM UTC-5, kedw...@swbell.net wrote:

The board will not boot from the LiPo Battery. When I plug in the battery no LEDs turn on.

I’m using a 1.6Ah / 7.4volt 2Cell Lipo battery. The battery shows 8.4 volts with a voltmeter.

Pressing the Power Button or the Reset Button does nothing. If I plugin a 12-volt power source into the barrel jack it will boot.

Once booted the Battery Charging LED will blink. The four battery status LEDs will turn on and off in sequence for several seconds.

Then they turn on solid for several seconds. It will continue this cycle as long as no power is applied to the motor drivers.

The 25% LED is always red and the other three are always green.

If I run rc_battery_check I see:

Pack: 8.48V   Cell: 4.24V   DC Jack: 12.29V

This is higher than the recommended 2S battery charge. I suspect the over-voltage protection might be kicking-in. We are setup for protection at 4.3V, so you seem to be floating pretty close. If the CHG_EN line goes low to disable the charger, the charger 

Overvoltage protection via http://www.ti.com/lit/ds/symlink/bq29209-q1.pdf --- provides CHG_EN

Charging via https://www.monolithicpower.com/DesktopModules/DocumentManage/API/Document/GetDocument?id=3323 --- provides charge supply for the battery as well as the V_BATT that feeds the 5V regulator

 

If I run rc_test_motors -d 1.0. I can run a motor from any of the motor drivers. The Battery Charging LED will turn on solid while a motor

 is running and will go back to blinking when the motor is disconnected. The four battery status LEDs will turn off if a motor is running.

I have not found any documentation on the battery status LEDs, so I do not know what the LED's are telling me.

There is a software process that goes and reads the battery status via the ADC and outputs to the LEDs.

https://github.com/StrawsonDesign/Robotics_Cape_Installer/blob/master/battery_monitor_service/rc_battery_monitor/rc_battery_monitor.c 

 

I left the 12-volt power source and LiPo battery plugged in over night to ensure the battery was fully charged. But it did not help.

Am I missing something? Any ideas what is going on?

Can you try draining it in something else for a bit?

 

Thanks,

Keith