The power boards are probably based on something like tps40140 or ltc3829.
They could have been ordered separately. worst case, they can be used to work on other chips later.
But I expected the power supply to be built in the dev board, and price for the dev board is almost twice what I expected, so sample chips will be fine and more fun.
Anyway, my 2 chips design only needs routing to be finished.
I've been away today and will be driving back home tomorrow (9hours trip at least), so I probably won't update until Wednesday.
Sample chips price is a little bit high too, I expected something closer to 50$ each, but if price for "small batches" is right, it doesn't really matters.
Before I buy 2 or 4 of them, I'll need some more technical informations than what can be found in the partial data sheet.
I'll check tomorrow or Wednesday for what's missing.
Can I assume the chips will be sent express (dhl/FedEx) within 1 or 2 days after payment will be made?
Yes, we will ship (DHL/FedEx) within 48 hours after full payment.
Thanks for the confirmation, here are some of my questions regarding the chips:
Can we supply non symetrical voltages to body bias?
Let's say +0.8v and -1.1v
This could be an option to improve a little bit the global efficiency.
Also, can you confirm that both pairs are supposed to receive the same voltages?
BTC_VDDS0/1
BTC_GNDS0/1
I won't mix voltages, but since there are 2 pairs of pins, it could happen on different designs
What do we do with the last chip downstream UART pins?
Left open, pulled up/down?
Your schematics, with the 4.7k resistors, seems to suggest pulled up, but even the pins in use are shown with the same 4.7k resistor.
So it's not really clear which ones do need what.
What do you call "internal oscillator"
Is it an oscillator built in the SF3301, or does it refer to the on board oscillator?
And last one for now:
Will you provide the software you used to test the dev board in your github?