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Dalik
Dalik
Associate II
October 27, 2023
Solved

STM32G0B1CC

Hi,

1. In DS13560 selection 4 page 42, what is different between the GP and N versions?

Best, Dalik LIM

This topic has been closed for replies.
Pierre_Paris
Pierre_ParisBest answer
ST Employee
October 30, 2023

"The origin of the split GND approach comes from the need to keep separated return currents for analog and digital subsystems. The separation between the two subsystems can be achieved by a physical separation of the two grounds (real cut) or by a spacial separation of them. When using more than one mixed signal IC with common GND connections for analog and digital signal the approach of having separate grounds may cause more issues compared to a single GND configuration. [...] Additionally, the use of a split GND plane can create other problems because of the presence of possible multiple return paths of the supply current, and consequently of possible current loops. The supply current must return through a common ground terminal to which both the analog and the digital sub subsystem are referenced. The presence of the current loop will generate radiated emission, with the emission level being proportional to the loop area and to the current intensity. " (chapter 9.Mixed signal PCB layout of AN5043)

My advise is to use a single GND, as you can also see on the DataSheet (Figure 1 and 2).

Best Regards,

Pierre

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6 replies

Peter BENSCH
Peter BENSCH
ST Technical Moderator
October 27, 2023

GP and N differ in pinout, which are also listed in the data sheet, section 4 as "GP version" and "N version". Further details can be found in table 2.

Does it answer your question?

Good luck!
/Peter

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    Pierre_Paris
    Pierre_Paris
    ST Employee
    October 27, 2023

    Hello,

    Thank you for your question.

    Here some additional information:

    The devices come in packages with 32 to 100 pins. Some packages with low pin count are
    available in two pinouts (standard and alternative indicated by “N” suffix). Products marked
    by N suffix are offering VDDIO2 supply and additional UCPD port versus the standard pinout,
    therefore those are better choice for UCPD/USB applications.

    Best Regards,

    Pierre

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      Dalik
      DalikAuthor
      Associate II
      October 28, 2023

      Hi,

      My Application of STM32G0 is used for developing the product NFC reader.

      1. Can you recommend the reference hardware design for STM32G0B1CCT6?
      best,

      Dalik LIM

      Pierre_Paris
      Pierre_Paris
      ST Employee
      October 30, 2023

      Hello @Dalik,

      Are you using the ST25 NFC Readers ? If yes, have you consider AN5043 or AN5240.

      You can find here a hardware implementation overview  for STM32G0.

      Best Regards,

      Pierre

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        Dalik
        DalikAuthor
        Associate II
        October 30, 2023

        hi, 

        For ST25R3916B, GND_D, GND_DR1 and GND_DR2 Pins can connect direclty to GND?

        best, 

        Dalik LIM

        Pierre_Paris
        Pierre_ParisBest answer
        ST Employee
        October 30, 2023

        "The origin of the split GND approach comes from the need to keep separated return currents for analog and digital subsystems. The separation between the two subsystems can be achieved by a physical separation of the two grounds (real cut) or by a spacial separation of them. When using more than one mixed signal IC with common GND connections for analog and digital signal the approach of having separate grounds may cause more issues compared to a single GND configuration. [...] Additionally, the use of a split GND plane can create other problems because of the presence of possible multiple return paths of the supply current, and consequently of possible current loops. The supply current must return through a common ground terminal to which both the analog and the digital sub subsystem are referenced. The presence of the current loop will generate radiated emission, with the emission level being proportional to the loop area and to the current intensity. " (chapter 9.Mixed signal PCB layout of AN5043)

        My advise is to use a single GND, as you can also see on the DataSheet (Figure 1 and 2).

        Best Regards,

        Pierre

        To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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