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TMS570LS1224: functional safety test suggestion

Yuan Tan63
Expert 3280 points

Part Number: TMS570LS1224
Other Parts Discussed in Thread: TMS5701224

Hi

1 for circuit inspection before power on, it need check signal from nEEOR to relay is in good condition. Can customer give nERROR a low voltage from a transistor. is that ok? or can customer change nEEOR from register?

2 can customer change ENDRV from register

3 Does TMS5701224 have power supervisor? when power supply is overspec, is there any protection or response?

4 customer use TPS65381, can this part help on power supervisor for TMS570? (if you know that)

thanks.

  • 0
    TI__Mastermind 49120 points

    Hi Yuan,

    1. For circuit inspection before power on, it need check signal from nEEOR to relay is in good condition. Can customer give nERROR a low voltage from a transistor. is that ok? or can customer change nEEOR from register?

      >> Yes, nERROR can be driven as part of the start-up sequence using the "Error Forcing Mode" in the ESM. See section 12.2.3 on page 443 in the TRM (spnu515c).

    2. Can customer change ENDRV from register

      >> Yes, this can be tested as well. See the TPS65381A datasheet for more details. A driver for the TPS65381A is included as part of the Software Diagnostics Library (http://www.ti.com/tool/SAFETI_DIAG_LIB). The SDL installation includes a user manual for this driver, which includes functions to test the TPS65381 diagnostics. Please post any more questions you have to this forum: (https://e2e.ti.com/support/power-management/f/196)

    3. Does TMS5701224 have power supervisor? when power supply is overspec, is there any protection or response?

      TMS570 includes a voltage monitor. The main purpose of this VMON is to not require a strict power-up/down sequencing requirement between the core and I/O supplies. VMON also includes circuitry for detecting over and undervoltage for the supplies, but these thresholds are very gross and deliberately way out of the recommended operating range. There MUST be an external circuit responsible for monitoring the supplies to the MCU and to assert nPORRST if the supplies are out of spec (see datasheet for more details).

    4. Customer use TPS65381, can this part help on power supervisor for TMS570? (if you know that)

    I may not have understood this question correctly. Yes, TPS65381A is a PMIC. It includes capabilities to regulate and monitor its outputs, and also assert a power-on-reset to the MCU in case of the supplies going out of range or in case of a fault.