pzw001
Newbie level 2
I am designing a M2M unit which uses the SIM340C module. I have read the data sheet multiple times, but can not figure out (at least not for 100% sure) what the correct way is to power the module.
If I read it correctly, the moment I use a LiPo pack I can power the module with +5VDC at pin 11, and use the (multiple) VBAT connections to connect the LiPo pack. When I decide not to use a LiPo pack I have to design a 4V power supply which can burst 2A to the module. (See page 20 in the data sheet)
But it is not really clear to me what the power requirement is of the 5V power supply. It says under "3.5.5. Charger requirements": Output Voltage 5.0-5.25V / Charging current limitation 650mA. So I assume if I design the 5V power supply to deliver at least 650mA it should work without a problem. (Correct?)
And am I correct in my assumption that the 2A bursts are (supposed) to come from the LiPo battery? What if the battery is empty? I do have buffer capacitors at the VBAT connection, so there is some buffer for the short bursts...
Has anyone ever hooked up a LiPo pack? What is the experience? LiPo's are nice, but if something goes wrong it can end up in flames too. And that is what I would like to prevent :wink: ...
Thanks.
Paul
If I read it correctly, the moment I use a LiPo pack I can power the module with +5VDC at pin 11, and use the (multiple) VBAT connections to connect the LiPo pack. When I decide not to use a LiPo pack I have to design a 4V power supply which can burst 2A to the module. (See page 20 in the data sheet)
But it is not really clear to me what the power requirement is of the 5V power supply. It says under "3.5.5. Charger requirements": Output Voltage 5.0-5.25V / Charging current limitation 650mA. So I assume if I design the 5V power supply to deliver at least 650mA it should work without a problem. (Correct?)
And am I correct in my assumption that the 2A bursts are (supposed) to come from the LiPo battery? What if the battery is empty? I do have buffer capacitors at the VBAT connection, so there is some buffer for the short bursts...
Has anyone ever hooked up a LiPo pack? What is the experience? LiPo's are nice, but if something goes wrong it can end up in flames too. And that is what I would like to prevent :wink: ...
Thanks.
Paul
