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Forum Index : Microcontroller and PC projects : PicoMiteHDMIUSB motherboard reference design

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ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 106
Posted: 09:24pm 23 Apr 2025
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This is the wiring diagram for DVPP supply:



Component: U34 - TPS7A7002DDAR

This is a low dropout linear regulator (LDO) from Texas Instruments.

But what value should DVDD be set to?
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 9992
Posted: 09:39pm 23 Apr 2025
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Can anyone else tell me what I need to do to ensure that the date and time are not lost after switching off?

set the time "RTC SETTIME"

  Quote  But what value should DVDD be set to?


1.3V for 1280P, less if you don't want to run that fast
 
ManiB
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Joined: 12/10/2019
Location: Germany
Posts: 106
Posted: 05:26pm 24 Apr 2025
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  matherp said  Can anyone else tell me what I need to do to ensure that the date and time are not lost after switching off?

set the time "RTC SETTIME"

  Quote  But what value should DVDD be set to?


1.3V for 1280P, less if you don't want to run that fast


Thanks Peter, thas was the solution.

I've soldered in the PSRAM now in one board (U33).

How can I test it?

This is the description in the manual:
OPTION PSRAM PIN n   Enable/disable PSRAM support.
or                   ‘n’ is the PSRAM chip select (CS) pin and can be 0, 8, 19, or 47.
OPTION PSRAM DISABLE Typically GP47 is used for Pimoroni boards. Default is disabled.


Note: It seemed there is only GP0 available.
Edited 2025-04-25 03:36 by ManiB
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 9992
Posted: 05:49pm 24 Apr 2025
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OPTION PSRAM PIN GP47
 
ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 106
Posted: 06:03pm 24 Apr 2025
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  matherp said  OPTION PSRAM PIN GP47


Thanks, now it shows: "Totalof 6 Mbytes PSRAM available"

> memory
Program:
  2K ( 1%) Program (95 lines)
182K (99%) Free

Saved Variables:
 16K (100%) Free

RAM:
  0K ( 0%) 0 Variables
  0K ( 0%) General
6376K (100%) Free
 
ManiB
Senior Member

Joined: 12/10/2019
Location: Germany
Posts: 106
Posted: 08:05am 28 Apr 2025
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  PilotPirx said  @ManiB
If you order a batch from JLCPCB (5 pieces), I would be interested in a circuit board. Shipping within Germany should not be a problem. Could I buy it from you?


Hello PilotPirx,

your board is assembled, tested and ready for shipping.

I've sent you a PM ;)

Manfred
 
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