[time-nuts] PLL suggestions

[Graham / KE9H]

On Tue, Dec 31, 2019 at 9:38 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> The gotcha with a 6 pin package is that it is unlikely to have a (4 pin)
> SPI interface.
> Pretty much every PLL chip in the universe is SPI.
>
> Bob
>
>
Bob:

I think things are more powerful than you think.

For example, check out a PIC16F18313, 8 pin SOIC-8.
6 I-O pins, mappable through a pin-mux.
Includes ADC, DAC, 3  Timers, UART, I2C, SPI, 2 blocks of user configurable
logic, and an on board CPU master clock good to 1 % over temp and voltage.

$0.75 in quantity 1 !

So, all of that for less than a 555 timer IC.

You don't have enough pins to get at everything simultaneously, but no
problem configuring a PLL over a SPI.

--- Graham