[time-nuts] Si570 question

paul swed paulswedb at gmail.com
Tue Nov 18 11:04:57 EST 2014

I just picked up the si5351a and the thing that jumps out at mee is the 228
registers to program.
Granted it lets you create just about any frequency and there is a good
program that tells you what to set the registers to. But 228 registers is a
The traditional I2C is indeed simple. Make sure you watch the LSB order and
setup times.
I see there are various ebay class boards to connect to usb for a few $ and
also boards that let you program in Windows studio as an example.
Or as you want to do straight out of a micro.

On Tue, Nov 18, 2014 at 10:59 AM, Jim Lux <jimlux at earthlink.net> 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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