[time-nuts] Si570 question

Brooke Clarke brooke at pacific.net
Tue Nov 18 17:21:14 EST 2014

Hi Jim:

A number of hams have built VFOs using this chip, for example here's some data:
Mail_Attachment --
Have Fun,

Brooke Clarke
Jim Lux wrote:
> I'm sure someone here has fooled with the Si570.
> I just got a few of them (CMOS output), and am about to deadbug one of them to fool with it (unless there's some 
> convenient protoboard out there available.. I didn't look too long and hard, but some casual googling didn't find one).
> Looking at AN334 from SiLabs:
> It looks like you just need a 10nF bypass on the Vcc, a pull down on the OE (1k), 1k pullups to 3.3V on SDA/SCL (which 
> is going to be driven by a 3.3V teensy 3.0/3.1 microcontroller)
> 150 ohm loads to ground, followed by a 0.1 uF DC block?
> I'm going to be running it at less than 50 MHz (although the parts I got are preset to 100 MHz)
> Any traps for the unwary?
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