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MSP430FR2633: MSP430FR2633IRHB RTC Crystal Oscillators ground guard ring connect to AVSS pin

Kelvin Kalariya4
Intellectual 790 points
Part Number: MSP430FR2633

Dear Sir,

In your MSP430™ 32-kHz Crystal Oscillators application note there is one layout rules - "Connect guard ring to AVSS pin of the MSP430 MCU with a short trace, Never connect the ground guard ring to any other ground signal on the board but in MSP430FR2633IRHB device datasheet there was no any AVSS pin so please suggest or advice which optional pins for AVSS to connect this guard ring.

Thanks,

Utpal

  • 0
    TI__Genius 17960 points
    Hi Kelvin,
    basically the rule for the connection of the guard ring, if implemented, can be boiled down to, "connect it as short as possible to the GND, used by the integrated oscillator".
    As with some devices the oscillator is supplied from AVCC/AVSS, the recommendation is, as you mentioned. Of course with devices, which do not have separate power supply pins for digital and analog, you can only connect it to DVSS. The background of the recommendation is, the GND connection of the oscillator externals, including the shield should not be carrying other noisy signals, as they might disturb the oscillator signals.

    Best regards
    Peter

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