actually - really? we could get it - just paying for your time? thanks sam
On 12/8/2010 1:25 PM, Roland Jollivet wrote: > I was wondering, can a fault ever occur with EMC where the frequency of the > charge pump frequency increases?? This would keep the charge pump detector > 'up', but a uP would detect an error condition. > > Regards > Roland > > > On 8 December 2010 20:53, John Kasunich<[email protected]> wrote: > >> On 4 December 2010 00:46, Kirk Wallace<[email protected]> >> wrote: >>> I'm working on using an ATtiny to watch EMC2's charge pump. >> Why not use a charge pump circuit to watch the charge pump signal? >> >> That is what it was designed for, and is probably the most fail-safe >> solution. The timeout period is set by the capacitors and resistors >> you choose, and can't get accidentally changed or disabled. >> >> A charge pump circuit consists of two diodes, one small capacitor >> (a few hundred pF or a few nF), one medium capacitor (a few tens >> of nF), and a resistor. Also needed is something to look at its >> output and turn off the dangerous stuff if the output drops too low. >> That can be as simple as a transistor driving a relay coil, or you >> could use a schmidt trigger input logic gate followed by whatever >> you need to drive. >> >> No microcontroller, no programming, no configuration, no bits. >> Analog lives! >> >> John Kasunich >> >> -- >> John Kasunich >> [email protected] >> >> >> >> ------------------------------------------------------------------------------ >> This SF Dev2Dev email is sponsored by: >> >> WikiLeaks The End of the Free Internet >> http://p.sf.net/sfu/therealnews-com >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > This SF Dev2Dev email is sponsored by: > > WikiLeaks The End of the Free Internet > http://p.sf.net/sfu/therealnews-com > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF Dev2Dev email is sponsored by: WikiLeaks The End of the Free Internet http://p.sf.net/sfu/therealnews-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
