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L99PM72GXP 数据表(PDF) 30 Page - STMicroelectronics

部件名 L99PM72GXP
功能描述  Advanced power management system IC with embedded LIN and high speed CAN transceiver supporting CAN Partial Networking
PDF  129 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L99PM72GXP 数据表(HTML) 30 Page - STMicroelectronics

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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 L99PM72GXP 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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