Dirty cheap. https://www.adafruit.com/product/3013 Sent from ProtonMail Mobile
On Sat, Jul 22, 2017 at 8:33 PM, gwes <g...@oat.com> wrote: > On 07/22/17 12:10, Theo de Raadt wrote: > > I'd really like if someone could > find a USB RTC clock, which is a viable > affordable product which we can > then create good support for. I've searched > and found a few prototypes and > 'licence key' products, but nothing readily > available which we could > support & encourage as a solution for the RTC > problem. > What kind of > packaging, fit & finish, and price would be acceptable? For example: A > commodity microcontroller on a tiny PCB, a Dallas Semi RTC on another tiny > commodity PCB and a lithium coin cell in a 4cm x 6cm x 2cm commodity box > could be professionally assembled and sold in unit quantities in a month for > $50. Accuracy limit is the 32Khz crystal. Temperature compensation to match > the standard quartz curves in the ucode. Burn-in and trimming to a few PPM > would add maybe $5. The same parts on a single PCB in a slightly smaller box > might take three months, an expected sale quantity of 50, and sell for $30. > USB stick size, etc. - I'm sure you can extrapolate from there. Geoff Steckel
