1

I have bought SIM808 module, everything working fine. All AT commands are giving expected response, i'm accessing it through hyperterminal. My problem is that whenever i make or receive a call or SMS , GSM gets restarting.(I can able to make/receive call, getting ring/alert for small period of time and then interrupt). But there is no Under or Lower voltage power down or warning. I have tried with DC power supply of 5V/500mA , 5V/1A and 5V/2A. What might be the reason ? Please help. extra info : It has one LM2576S voltage regulator in-built.

1

Check the datasheet and I think you will find you need 3 amps peak. It requires this peak current when you make a call or send a text/sms.

Use a 5A power supply and that should solve the problem.

I have never tried it but "super capacitors" might work, providing the extra power when its needed, it depends how long you need the 3A for.

| improve this answer | |
  • 1
    Thanks Matt for reply. I dnt have datasheet for that module. Bt according to SIM808 datasheet, it's peak current is 2A and voltage is 3.4 to 4.4. so i dnt know for module, how much input should be given – sankar Feb 20 '17 at 12:48
  • does the module withstand with 5A current ? @Matt – sankar Feb 21 '17 at 6:55
  • I got the solution for my problem. With 12V-1.5A power supply, it works fine. – sankar Feb 27 '17 at 3:56
-1

I too faced the same problem and solved it.

Just use a 3.3V logic converter or a 3.3V interface, as the 5V causes the device to restart.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.