Hello,
Somebody who know how to connect a battery to the telit gm862-gps module?
The module has built in a battery charger but I don’t know how to connect the battery terminals.
I don’t know if the (+) terminal must be connected to the CHARGE pin of the module and the (-) to ground obiously. And the dc line to the 3.7 pin and ground.
Please help me with this!!!
Thank you.
There is a doc availiable from roundsolution. I am also looking the power mangement solution for this module
Hello,
There are two important docs to check this; the hardware doc and the battery doc.
But they don’t say how to connect the battery terminals. That is my question. How???
Hi!Im also trying to connect battery to telit. I have 3.7 Li-ion batery which has 3 pins.Is this properly to connect + pin to VBATT, - pin to GND,and third pin in middle to CHARGE?
im also having some probs regarding power supply. im using sparkfun evaluation bord. i’ve li-poly 3.7 battery 1100mAh. connected battery with tantelum cap (100 uf 10v) to 3.8 pin and ground but the module is shuting down bfore it’s being registerd with gsm network. but telit says only 500-1000mAh battery with cap is enough???
CFUN is normaly on state “1” - that means “no power saving”,
but with 5V at Charger-Input the modul goes to state “4”, that means “powersaving”. So the SIMM-Card will not be regognized - because of cfun state “4”.
i guess it is not the case, b’cos when i powered the module through eval board power input (with high capacity batteries-5.1v 2100mAh + cap), it just work fine registering with gsm network and functioning normally. but when i used 3.7 1100mAh + tant cap through 3.8(VBATT) pin it doesnt working …
thanx for replying!!!
OOOH I catch you!
That is strange!!! I bought two batteries of 3.7v 2100mAH. Im waiting them to arrive to my home. And when i make the test I will tell you what happend to me.
my problem is ok. it jst working fine. previously i’ve used somewhat lengthy connectors to connect battery, cap and module. but wen i made them short, module was registered even without the cap. (but for proper operation cap is necessary). your batteries will do it, make the connectors as much as short…
What about if your Li-Ion battery has only 2 terminals +/- ?
http://www.sparkfun.com/commerce/produc … ts_id=8484
Could you connect the + terminal to both the VBATT and charge terminals on the GM862?
If you can’t, where can you find a Li-Ion battery with three terminals?
Thanks
The third terminal is for temperature measurement during charging, some batteries contain a thermistor. It’s often marked with a ‘T’.
Leon
Just a WARNING to all Telit module developers:louisk2:
What about if your Li-Ion battery has only 2 terminals +/- ?http://www.sparkfun.com/commerce/produc … ts_id=8484
Could you connect the + terminal to both the VBATT and charge terminals on the GM862?
The CHARGE pins (there are two on most modules AFAIK) are for the external power source’s positive lead. That is to say, a separate non-battery DC voltage source - which will have positive and negative wires - connects to the CHARGE pins with positive and the GND pins with negative. Telit recommends no more than 400mA to CHARGE.
CHARGE supplies power to the Telit device’s in-built battery charging circuits. The battery should be nowhere near the CHARGE pins. Battery positive goes to VBATT and battery negative to GND obviously.
Telit also say to NOT use Ni-Cd or Li-Poly batteries directly with the module. Li-Ion only, or put a regulator between the module and the battery.