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soen
Joined: 18 Feb 2009
Posts: 5
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 18 Feb 2009 13:33 sim340z |
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Could someone please help.....help...
My sim340 SIM_VDD keep dropping off every 5 to 10 seconds.
It could not register to any network.
Is anyone know if the sim340 will work with australian phone network?
Thank You so much...please reply if you can....
Best regards,
soen
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sabeti_1990
Joined: 16 Nov 2007
Posts: 178
Helped: 11
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20 Feb 2009 18:22 sim300 battery |
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hi
yes it's work with all "apn"s
your problem is because of supply of module
1- the module voltage may be less than 3.6V or higher than 4V.
2- maybe your supply cannot support the module voltage.
be success
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soen
Joined: 18 Feb 2009
Posts: 5
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22 Feb 2009 0:40 sim300 battery charge |
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Hi Sabeti, Thank you for your help. I try using 4.5V 3XAA batteries to test. and it works like a charms.
Do you know what is the LDO stand for? I saw it in the sim300 demo CCT? Do we need VEXT to get the SIM300 to work properly?
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Google
AdSense
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22 Feb 2009 0:40 Ads |
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sabeti_1990
Joined: 16 Nov 2007
Posts: 178
Helped: 11
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23 Feb 2009 7:16 sim300 without battery |
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hi
U need to use 3.7 V litium battery (if U want use the module with battery)
VEXT use when U want to supply another chip or etc as module slave or charge the 3.7V battery
for battery harging see the hardware application for sim300
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soen
Joined: 18 Feb 2009
Posts: 5
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23 Feb 2009 11:53 sim300 charge |
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| Do you know what is LDO? What is the actual component? where could we get them?
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sabeti_1990
Joined: 16 Nov 2007
Posts: 178
Helped: 11
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24 Feb 2009 17:49 diagram of sim300 |
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hi
upload it's picture
did U mean like this
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soen
Joined: 18 Feb 2009
Posts: 5
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26 Feb 2009 13:16 battery for sim300 |
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| Hi Sabeti, I have got the circuit. I just don't understand why we need the LDO? My test CCT without LDO is working without problem. Do we really need the LDO? What is LDO? Why the output of the LDO is connected to the output of SIM300 (VEXT)???? I could not get the specification of that part! and do you know where we could buy one?
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john123456
Joined: 23 Feb 2009
Posts: 1
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26 Feb 2009 23:38 sim300 application note |
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| HELLO I M FROM GREECE I M LOOKING FOR A SCHEMATIC DIAGRAM WITH A SIM300 ONLY FOR VOICE APLICATTION CAN SOMEBODY HELP ME?.
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soen
Joined: 18 Feb 2009
Posts: 5
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27 Feb 2009 12:43 +++ sim300 |
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Hi john,
Sorry, I am new as well about the SIM300.
I wish I could help you. Good luck.
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lanovan
Joined: 13 Jul 2006
Posts: 11
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30 Jul 2009 7:28 sim300 greece |
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| LDO is Low Drop Out regulator. It's typically a linear regulator with low drop voltage when it operates.
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