Hi,
MCP73834, here the ds:
page 17, table 5-1. Standard hook-up. 10k "The system test mode is entered by driving the THERM input greater than (VDD-100 mV) with no battery connected to the output."
There is no battery connected, indeed, but the THERM input is pulled-down with the 10k resistor. So how could the 73834 enter is such a state?
Marco
Looks like one of those occasions I always hated at Motorola... data sheet written by someone other than the chip designer.
What VDD ?? ...Jim Thompson
Il 06/04/2013 19:42, Jim Thompson ha scritto:
5VMarco
Looks like that's what it is supposed to do. See...
Il 06/04/2013 21:51, Jim Thompson ha scritto:
Thank you very much! What's the bottom line, then? I mean, the LTVT signal will be always high, no matter the presence of the battery. I'm afraid about the charging: no problem (I guess) if it enters the system test mode without the bat, but I'd like it will charge it...
Marco
I haven't worked my way thru the whole data sheet, so I don't know. I did a LiIon charger chip a gezillion years ago, and there was some very precise voltage measurements that controlled charging (and discharge limits in my case).
With poorly written data sheets you're stuck with experimentation and prayer >:-} ...Jim Thompson
Il 07/04/2013 18:24, Jim Thompson ha scritto:
It seems it works... in the afternoon I charged a Li-Ion battery at very low current (about 250 mA). After few hours the end-of-charge led lit up, eventually.
Marco
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