What is the high and low threshold voltage of MPS pin of TLF35584?
Mar 16, 2023 05:56 AM
The TLF35584 datasheet does not describe the electrical interface specifications for the MPS pin. It is better to consider that the threshold voltage of MPS pin is 2.2 – 3.0V.
- Typ. threshold is at around 2.5-2.7V. Nevertheless, it is NOT tested in production. So better consider +-300mV margin. Further there is only a very narrow hysteresis, so longer voltage exposure in the described range has to be avoided. Transiently it is not a problem. The active MPS feature includes the following changes to the normal operation of the device:
- The INIT timer will be stopped.
- The contribution of the window watchdog failure counter overflow to the reset ROT will be blocked.
- The contribution of the functional watchdog failure counter overflow to the reset ROT will be blocked.
- The contribution of the error monitoring to the reset ROT will be blocked. It has not been specified, because the initial idea was that this pin/function is only used for flashing of the MCU and during that the MPS pin can be connected to QVR output (by jumper, contact-needles, or a switch).
- It is one option to connect the MPS pin to the output QVR during microcontroller programming (this means, that MPS can/shall be connected to QVR, but it is not a must)
- 3V3 (like QUC) was not in Focus, especially not controlled by an IO with 3V3 logic-level.
- Nevertheless, in principle it works, because the threshold is in this area, but the problem is the specification for that and the ensured 3.0V from the 3V3 domain-based IO of the MCU.
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