USB, DC & Solar Lipoly Charger - LBO Modifications

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pmsilva
 
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USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

Hi
I buy the USB, DC & Solar Lipoly Charger equipped with the MCP73871, and I would like to know if is possible to alter the value of the LBO. From your website the value is fixed into 3.1V. Can I modify the board to have for example an LBO activated when I have 3.5V or 3.4V on the battery.
Because if I have the battery with 3V I think the battery would never charge again...
Thank you for the help

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adafruit_support_bill
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by adafruit_support_bill »

The LBO detection threshold is built into the chip and can't be changed: http://www.adafruit.com/datasheets/MCP73871.pdf

pmsilva
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

Ok, Thank you.
Is safe to have a LiPo at 3.1V ?
Can I recharge-it again without damage-it?

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adafruit_support_bill
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by adafruit_support_bill »

3.1v is fine. All the LiPo cells we have in the store include a protection circuit that prevents over-discharge also.

pmsilva
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

Ok,
Thank you a lot!

pmsilva
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

I have another question,
Looking at the electrical scheme the LBO is connected to the VCC (power supply from the charger or solar panel). If I have no power supply connected, the MCP73871 still output the LBO, ie, the IC is capable of outputting LBO signal using the battery?
Thank you

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adafruit_support_bill
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by adafruit_support_bill »

The low battery signal is not active if there is no power to the charger. The charger has no way to detect it without a voltage reference.

pmsilva
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

Ok,
But I can still use the board for example to supply my project at night for example, and during the day the solar panel will give to the board the energy to recharge the LiPo right?
Thank you

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adafruit_support_bill
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by adafruit_support_bill »

That is correct. You will still have battery power available to the load.

pmsilva
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by pmsilva »

Thanks!

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FerminRJ
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by FerminRJ »

Good Morning!

I have a question related with "USB, DC & SOLAR LIPOLY CHARGER" module. I need know that the LBO (Low Battery Indicator) system output STAT1 ("C" pad in pcb) can send to a system via a pull-up resistor for interfacing to a host microcontroller, for example, to send signal to GPIO port in raspberry, for detect low voltage in battery with python script in raspberry pi... Is posible? How to get this function? I need aditional hardware or pieces to adapt signal to GPIO port?

My idea are a auto-shutdown raspberry pi when the battery power are low...

Thanks a lot!!!

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adafruit_support_bill
 
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Re: USB, DC & Solar Lipoly Charger - LBO Modifications

Post by adafruit_support_bill »

@FerminRJ - Please see this thread regarding connecting the LBO to the Pi: http://forums.adafruit.com/viewtopic.php?f=8&t=73893

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