Re: Using batteries with RTC Dallas ds1306

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

Threaded View
Quoted text here. Click to load it
lithium
I
You could try to create a negative voltage of 0.6V, and connect the minus
of the battery to that, subtracting 0.6V when the system is running:
                            diode
clocksignal -----||----.----KA-------.------.---------.---- -0.6V to minus
battery
                10nF   |             |      |         |
                       |             |      K diode   |
                      100K          10nF    A        1M
                       |             |      |         |
                       |             |      |         |
   gnd      -----------'-------------'------'---------'---- GND

(view in fixed font)

Don't know if it works.

I vagely recall another method of generating a few 100mv negative, with just
one
transistor in a rather strange configuration. Just can't remember how ;)

--
Thanks, Frank.
(remove 'x' and 'invalid' when replying by email)




Re: Using batteries with RTC Dallas ds1306

Quoted text here. Click to load it
just


The classical 6..7V zener connected B-E junction, use a NPN with B=GND,
E=hot, then C goes negative.

Regards,
Arie de Muynck



Site Timeline