Comments on: GPS Logger V – Full hardware http://nada-labs.net/2010/gps-logger-v-full-hardware/ Straight from the workbench of Nathan Dyer. Wed, 13 Apr 2011 22:52:29 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: nada http://nada-labs.net/2010/gps-logger-v-full-hardware/comment-page-1/#comment-9707 nada Wed, 13 Apr 2011 22:52:29 +0000 http://nada-labs.net/?p=41#comment-9707 Hi Richard, Yes it works well, I get 3.24V from the regulator, running off a 3.7V Li-Ion battery. The only testing I did was on the board, to ensure the voltage was correct. I understood that it would be capable through reading the datasheet, with an efficency of 92% the converter will work properly for any input voltage above 3.58V, although that may be simplifying matters somewhat. The reason it works, besides just being a great device, is that Li-Ion batteries have a fairly flat discharge curve. They start at 4.2V but spend most of their discharge cycle at 3.7V, only dropping below that after 80% discharge. See <a href="http://www.mpoweruk.com/performance.htm" rel="nofollow">Battery Performance Characteristics</a> for more information. I hope that tells you what you wanted to know. -nada Hi Richard,

Yes it works well, I get 3.24V from the regulator, running off a 3.7V Li-Ion battery.
The only testing I did was on the board, to ensure the voltage was correct. I understood that it would be capable through reading the datasheet, with an efficency of 92% the converter will work properly for any input voltage above 3.58V, although that may be simplifying matters somewhat.

The reason it works, besides just being a great device, is that Li-Ion batteries have a fairly flat discharge curve. They start at 4.2V but spend most of their discharge cycle at 3.7V, only dropping below that after 80% discharge. See Battery Performance Characteristics for more information.

I hope that tells you what you wanted to know.

-nada

]]> By: Richard http://nada-labs.net/2010/gps-logger-v-full-hardware/comment-page-1/#comment-9685 Richard Wed, 13 Apr 2011 12:35:27 +0000 http://nada-labs.net/?p=41#comment-9685 Hello nada, I find your article very interesting, nice work! I see you are using the TC105333ECT with an input of 3.7v coming from 2 Li-Ion connected in parallel. My question is: Does the TC105333ECT work well with such a low input? Could you tell me a little bit more about your test for this part of the circuit? Thanks in advance! Hello nada, I find your article very interesting, nice work!
I see you are using the TC105333ECT with an input of 3.7v coming from 2 Li-Ion connected in parallel. My question is: Does the TC105333ECT work well with such a low input? Could you tell me a little bit more about your test for this part of the circuit?
Thanks in advance!

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