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MSPM0L1105: hysteresis of I/O

user4731379
Prodigy 20 points
Part Number: MSPM0L1105

Tool/software:

MSPM0L1105, I have some questions about the hysteresis of GPIO in this MCU, as follows:
The VDD of the IC is 3.228V
1. There is only one minimum value for hysteresis in the spec, calculated as 0.1x3.228V=0.3228V; What is the maximum value?
2. The IC itself has VIH and VIL, and my understanding of hysteresis can be calculated
Vih(min)=3.228V x 0.7=2.26V.
Vil(max)=3.228V x 0.3=0.968V
So hysteresis=1.292V (2.26V-0.968V)
So what is the meaning of hysteresis in the spec?
  • 0
    TI__Genius 10611 points

    Hi,

    For SDIOs, the hysteresis is enabled by default. HYSTEN bit has no effect.

    I have done the test. I used GPIO interrupt to monitor the logic level change. When logic level change from 0 -> 1 or 1 -> 0, GPIO interrupt generation and another GPIO will be toggled

    • Input voltage change from 0 V -> 3.3 V. The threshold is about 1.63 V.
    • Input voltage change from 3.3 V -> 0 V. The threshold is about 1.44 V.

    Hysteresis means that (1.63-1,44)

    Zoey