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L99PM72PXP Datasheet(PDF) 30 Page - STMicroelectronics |
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L99PM72PXP Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 128 page  Detailed description L99PM72PXP 30/128 Doc ID 023553 Rev 3 Figure 17. Example: exit Fail-Safe mode from Watchdog failure 2.5.2 Multiple failures – entering forced VBat_standby Mode If the Fail-Safe condition persists and all attempts to return to normal system operation fail, the L99PM72PXP enters the Forced Vbat_standby Mode in order to prevent damage to the system. The Forced Vbat_standby Mode can be terminated by any regular wake-up event. The root cause of the Forced Vbat_standby is indicated in the SPI Status Registers The forced Vbat_standby Mode is entered in case of: ● Multiple watchdog failures: forced sleep WD = 1 (15 x watchdog failure) ● Multiple thermal shutdown 2: forced sleep TSD2/SHTV1 = 1 (7 x TSD2) ● V1 short at turn-on: forced sleep TSD2/SHTV1 = 1 (V1 <V1_Fail for t > tv1fail) Temperature Tj >TSD2 Fail_safe =1; TW=1; TSD1 = 1; TSD2 = 1 Tj <TSD2 Read & Clear SR3 SPI DI short to GND or VCC Fail_safe = 1 Valid SPI command 1. If V1 < V1_Fail (for t > tv1fail) The Fail_safe Bit is located in the Global Status Register (Bit 0) Table 6. Fail-Safe conditions and exit modes (continued) Failure source Failure condition Diagnosis Exit from Fail_safe Mode |
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