米6体育平台手机版

SNVA966 July 2020 – MONTH LP8864-Q1 , LP8864S-Q1 , LP8866-Q1 , LP8866S-Q1

Trademarks
1Fault Handling Routine
2Different Fault and Diagnostic Handling Method Recommendation
1. 2.1 Different Fault Handling Method
2. 2.2 Different Diagnostic Wrong Information Handling Method
  1. 2.2.1 System-Level Critical Wrong Diagnostic Information
  2. 2.2.2 System Level Sustainable Wrong Diagnostic Information
3Summary
A Fault-Related Functions
1. A.1 Protection and Fault Detections
  1. A.1.1 Supply Faults
    1. A.1.1.1 VIN Undervoltage Faults (VINUVLO)
    2. 16
    3. A.1.1.2 VIN Overvoltage Faults (VINOVP)
    4. A.1.1.3 VDD Undervoltage Faults (VDDUVLO)
    5. A.1.1.4 VIN OCP Faults (VINOCP)
    6. A.1.1.5 Charge Pump Faults (CPCAP, CP)
    7. A.1.1.6 Boost Sync Clock Invalid Faults (BSTSYNC)
    8. A.1.1.7 CRC Error Faults (CRCERR)
  2. A.1.2 Boost Faults
  3. A.1.3 LED Faults
    1. A.1.3.1 Open LED Faults (OPEN_LED)
    2. A.1.3.2 Short LED Faults (SHORT_LED)
    3. A.1.3.3 LED Short to GND Faults (GND_LED)
    4. A.1.3.4 Invalid LED String Faults (INVSTRING)
    5. A.1.3.5 I2C Timeout Faults
  4. A.1.4 Overview of the Fault and Protection Schemes
2. A.2 Programming Examples
  1. A.2.1 Clearing Fault Interrupts
  2. A.2.2 Disabling Fault Interrupts
  3. A.2.3 Diagnostic Registers

A.1.2.1 Boost Overvoltage Faults (BSTOVPL, BSTOVPH)

Boost overvoltage is detected if the FB pin voltage exceeds the V_{FB_OVPL} threshold. When boost overvoltage is detected, BSTOVPL_STATUS bit will be set in the BOOST_FAULT_STATUS register. The boost FET stops switching, and the output voltage will be automatically limited. If the BSTOVPL_STATUS bit is continually set (that is, reappears after clearing), it may indicate an issue in the application. Boost overvoltage low is monitored during device normal operation (ACTIVE mode).

A second boost overvoltage high fault is detected if the FB pin voltage exceeds the V_{FB_OVPH} threshold or the DISCHARGE pin voltage exceeds the V_{BST_OVPH}. The LP886XX-Q1 device enters the fault recovery state to protect system damage from a high boost voltage. When boost overvoltage is detected, BSTOVPH_STATUS bit is set in the BOOST_FAULT_STATUS register. A fault interrupt is also generated. The device enters STANDBY mode and then attempt to restart after 100 ms. Boost overvoltage high is monitored during device normal operation (ACTIVE mode).