Re: [Gumstix-users] Using lithium-ion polymer batteries with the Overo motherboard

[Elvis D. <elv...@ma...>]

Hi,
        Page 116 of the TPS65950 data manual has some diagrams for  
charging the battery using a USB. The battery has to be interfaced  
with VBAT, ADIN1, ADIN2 and GND.

The VBAT, ADIN1 & ADIN2 pins are not there in the Overo J1 and J4  
connectors. Does this mean that the current overo motherboard cannot  
charge a li-on polymer battery?

How do other users manage using it for mobile applications, like  
robotics and UAVs ?

Best regards,

Elvis


On Dec 16, 2008, at 2:24 PM, Elvis Dowson wrote:

> Looking a bit closer, I see two sets of power supply pins on the J4  
> connector on the Overo motherboard
>
> 1	VSYSTEM		board supply: 3.3V - 4.2V
> 2	VSYSTEM		board supply: 3.3V - 4.2V
> 3	GND
> 32	USBH_VBUS
> 33	GND
>
> Question 01: Why two sets of power supply inputs to the board?
>
> Question 02: Which one should I connect a li-ion polymer battery  
> source to?
>
> Question 03: The TPS65950 appears to be able to support (correct me  
> if I'm wrong) charging via USB. The TPS65950 data sheet (page 38)  
> has two Dc-Dc regulators (VDD1 and VDD2). There are also some  
> references to VBAT for connection to the battery. There are also  
> some references to VRUSB3V1, VRUSB1V8, and VRUSB1V5 for USB internal  
> power supply sources.
>
> The overo motherboard J4 connector pin 32 refers to a USBH_VBUS. The  
> TPS65950 data sheet (page 18) mentions a USB Power Supply 5.0V VBUS.
>
> Does this mean that I can use the overo J4 USBH_VBUS to supply power  
> to the Overo motherboard via a powered USB port?
>
> I'm trying to see if I can connect a li-on polymer battery to the  
> overo motherboard and use the USB port to charge the battery at the  
> same time.
>
> Best regards,
>
> Elvis
>
>
>
>
>
> On Dec 16, 2008, at 1:48 PM, Elvis Dowson wrote:
>
>> Hi,
>>       Has anyone tried to use a li-ion polymer battery pack with  
>> the overo motherboard? I was thinking of trying to use a 1500mh  
>> 3.7v li-ion polymer battery used on the iPhone 3G, to power the  
>> Overo mother board.
>>
>> The TI TPS65950 appears to have some sort of li-ion battery charger  
>> support. Has anyone successfully connected a li-ion battery pack  
>> and charge it with the TPS65950?
>>
>> Best regards,
>>
>> Elvis
>