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TMAG5170-Q1: Influence to resisters by ALERT pin tied to GND?

Yoshiki Ochi
Genius 9435 points
Part Number: TMAG5170-Q1

Hi team, 

Considering using ALERT pin tied to GND, could you answer lower questions?

(1) Which resistor will be affected compared with ALERT pin is tied to VCC through pull up resistor? Is the only resistor affected by ALERT pin configuration "ALRT_LVL"?

(2) What does "ALERT response" shown in its datasheet mean? Is it defferent from "ALERT output" also shown in its datasheet?

Regards,
Ochi

  • 0
    TI__Expert 7950 points

    Hi Ochi-san,

    (1) When the ALERT pin is tied to GND, the ALRT_LVL field in the SYS_STATUS register should always be 0h)

    (2) "ALERT response" is similar to "ALERT output". "ALERT response", when enabled, means the device is responding to an alert condition by driving the ALERT pin low.

    Best regards,

    Jesse

  • 0
    TI__Mastermind 21080 points

    Ochi-san,

    Thanks for reaching out on E2E.  If ALERT is tied low, it will not be available to enable as an output.  Since it is an active low pin with open-drain output, the only possible drive state on this pin would be GND anyway, so there should not be any possible short circuit concern.  The two registers that track ALERT are ALRT_LVL and ALRT_DRV.  ALRT_DRV checks for errors when driving ALERT low, and with this pin tied to GND there can not be any fault detected for this diagnostic.

    The term "ALERT response" appears in context of various output conditions for the pin.  It can be used to indicate conversion completion, programmable threshold crossings, diagnostic status, etc.  The response is configurable based on a desired condition.  The "ALERT output" is more specifically related to the drive state of the pin. 

    Thanks,

    Scott