RTC board

https://github.com/MiSTer-devel/Main_MiSTer/wiki

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Sorgelig
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RTC board

Postby Sorgelig » Fri Sep 22, 2017 12:40 pm

New board for MiSTer - RTC
It's optional. For those who want their MISTer have the real time any time.

There will be be Linux and some cores update to utilize this board.

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Newsdee
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Re: RTC board

Postby Newsdee » Fri Sep 22, 2017 4:21 pm

I knew it :) I guessed from some of your renders.

Sorgelig
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Re: RTC board

Postby Sorgelig » Fri Sep 22, 2017 8:27 pm

yeah, it wasn't a secret.
It's strange that DE10-nano includes useless I2C accelerometer chip which is like 5th leg for dog. How they supposed to use accelerometer on board full of connected wires - it's pretty stationary device. They should include RTC instead which is pretty natural chip for such board.

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Re: RTC board

Postby TorsteinP » Fri Sep 22, 2017 8:48 pm

Sorgelig wrote:It's strange that DE10-nano includes useless I2C accelerometer chip which is like 5th leg for dog. How they supposed to use accelerometer on board full of connected wires - it's pretty stationary device. They should include RTC instead which is pretty natural chip for such board.

Since DE10-nano is so small, it can be used in drones and robots. Accelerometer makes more sence then :)

Sorgelig
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Re: RTC board

Postby Sorgelig » Fri Sep 22, 2017 9:39 pm

Since DE10-nano is so small, it can be used in drones and robots. Accelerometer makes more sence then :)

especially if you check the power consumption and heat dissipation ;)

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Re: RTC board

Postby Newsdee » Sat Sep 23, 2017 1:31 am

Maybe it was just a matter of space utilization on the board / cost reduction? The RPi doesn't have an RTC either.
The DE10 is small enough for mobile devices, maybe the accelerometer could be used as controller?

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Re: RTC board

Postby TorsteinP » Sat Oct 14, 2017 12:17 pm

Question. Why are there 18 pins on the board connector when there are only 14 pins on DE10-nano? It looks like there are space on both sides so it probably doesn't matter. I'm just wondering..

Sorgelig
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Re: RTC board

Postby Sorgelig » Sat Oct 14, 2017 3:17 pm

TorsteinP wrote:Question. Why are there 18 pins on the board connector when there are only 14 pins on DE10-nano? It looks like there are space on both sides so it probably doesn't matter. I'm just wondering..

It's a good question!
I've found that if i would use 14 pin connector then it's easy to shift the connector while connecting RTC board to the main board due to large space on both sides inside the boxed connector. That's why i've decided to use 18pin connector which perfectly fits inside and doesn't allow shifting.
But you may use 14pin connector if you cannot find 18pin. Then be careful when you connect the board - it's pretty hard to see the alignment.

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Re: RTC board

Postby THaase » Mon Oct 16, 2017 8:53 am

Hi Sorgelig,

I'm finding your MiSTer Project very interesting and will try to go for it in the near future.

As the Option boards are (more or less) needed I've alreay ordered 10pcs of each board by PCBWay.
While they are on shipment I'm trying to already get the needed parts.

As the SDRAM Board is clear, I've started with the RTC Board.

Can you confirm that the following parts should fit for the RTC Board?

X1 https://www.digikey.com/products/en?key ... 37-1-ND%20
B1 https://www.digikey.com/products/en?key ... 6-CT-ND%20
U1 https://www.digikey.com/products/en?key ... 2FMS-ND%20
R1,R2 https://www.digikey.com/products/en?key ... CRCT-ND%20
C1 https://www.digikey.com/products/en?key ... 25-1-ND%20
P1 https://www.aliexpress.com/item/10-pcs- ... a0a86f5ef1

Thanks a lot in advance.

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Re: RTC board

Postby Sorgelig » Mon Oct 16, 2017 11:13 am

I cannot confirm first two parts as they are not the same i've used. Battery holder has other positions of legs so i don't know if it will fit. Same goes for XTal.

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Re: RTC board

Postby THaase » Mon Oct 16, 2017 11:15 am

Thanks a lot - may I know which components you've used?

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Re: RTC board

Postby Sorgelig » Mon Oct 16, 2017 11:21 am

THaase wrote:Thanks a lot - may I know which components you've used?

i wrote the part numbers in schematics. See the PDF file.

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Re: RTC board

Postby THaase » Mon Oct 16, 2017 11:24 am

Stupid me -I'll check.

Thanks


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