[time-nuts] A look inside the DS3231

[Graham / KE9H]

Well, time and technology move on.
As wonderful as the DS3231 is, there is a newer chip from Micro Crystal
that is smaller, more accurate than the DS3231M, much cheaper, and draws
less power.

Micro Crystal is the Semiconductor division of Swatch (Swiss Watch Company)

If this sort of thing interests you, look at the

https://www.microcrystal.com/
https://www.microcrystal.com/en/products/real-time-clock-rtc/
https://www.microcrystal.com/en/products/real-time-clock-rtc/rv-3028-c7/

The RV-3028 is 3.2x1.5 mm in size, 1.5ppm, additionally trimmable, 45 nA
standby current, under $3 USD in price and in stock at Mouser and Digikey.
Of particular interest to me, besides all the normal features, this one
also directly keeps time in Linux Epoch time, seconds and fractions since
(your choice of epoch) so smaller data movements on the bus, and I don't
have to keep converting back and forth between time formats/structures.

--- Graham

==

On Sun, Apr 19, 2020 at 8:03 AM ASSI <Stromeko at nexgo.de> wrote:

> [blast from the past…]
>
> Attila Kinali writes:
> > My guess would be that it's a PN-junction or a bandgap temperature
> > sensor somewhere on the chip. Adding another part increases the cost
> > of production quite considerably.
>
> The die micrograph shows one clearly identifiable classical 8:1 bandgap
> circuit in 3x3 configuration in the lower left corner of the die plus
> three more instances of bipolar transistors (3x3, 3x2 and 4x2
> configuration) that might be used as additional temperature
> compensation.
>
>
> Regards,
> Achim.
> --
> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
>
> Waldorf MIDI Implementation & additional documentation:
> http://Synth.Stromeko.net/Downloads.html#WaldorfDocs
>
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