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LP8866S-Q1 Datasheet(PDF) 33 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 33 Page - Texas Instruments |
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33 / 82 page  7.3.9.1.5 Charge Pump Faults (CPCAP, CP) If during LP8866S-Q1 device operation voltage of CPUMP pin falls below typical 4.2-V, boost, power-line FET, and LED outputs are turned off, and the device enters Fault Recovery mode and then attempt to restart 100 ms after fault occurs. The CP_STATUS fault bit will beset in the SUPPLY_FAULT_STATUS register, and the INT pin are triggered. If during LP8866S-Q1 device initialization, the charge pump fly capacitor is disconnected or shorted, charge pump are turned off. In result, boost, power-line FET, and LED outputs are turned off, and the device enters Fault Recovery mode and then attempt to restart 100 ms after fault occurs. Both CPCAP_STATUS and CP_STATUS fault bits are set in the SUPPLY_FAULT_STATUS register, and the INT pin are triggered. 7.3.9.1.6 CRC Error Faults (CRCERR) If during LP8866S-Q1 device initialization, the factory default configuration for registers, options and trim bits are not corrected loaded from memory, LP8866S-Q1 keeps operating normally, unless other fault criteria is triggered. The CRCERR_STATUS fault bit are set in the SUPPLY_FAULT_STATUS register and the INT pin are triggered. 7.3.9.2 Boost Faults 7.3.9.2.1 Boost Overvoltage Faults (BSTOVPL, BSTOVPH) Boost overvoltage is detected if the FB pin voltage exceeds the VFB_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 loop issue in the application. Boost overvoltage low is monitored during device Boost Softstart and Normal mode. A second boost overvoltage high fault is detected if the FB pin voltage exceeds the VFB_OVPH threshold or the DISCHARGE pin voltage exceeds the VBST_OVPH. The LP8866S-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 Fault Recovery mode and then attempt to restart after 100 ms. Boost overvoltage high is monitored during Boost Softstart and Normal mode. 7.3.9.2.2 Boost Overcurrent Faults (BSTOCP) Boost overcurrent is detected if the FB pin voltage drops below the VUVP threshold for 110 ms. If the boost overcurrent timer expires before the output voltage recovers, the BSTOCP_STATUS bit is set in the BOOST_FAULT_STATUS register. The fault recovery state is entered, and a fault interrupt is generated. The device will enter Fault Recovery mode and then attempt to restart after 100 ms. If the BSTOCP_STATUS bit is permanently set, it may indicate an issue in the application. Boost overcurrent is monitored from the boost start, and fault may trigger during boost start-up. 7.3.9.2.3 LEDSET Resistor Missing Faults (LEDSET) The LEDSET resistor missing or invalid is detected if the resistor is not assembled or not valid value as requested during the initialization. The LP8866S-Q1 device defaults to 6-channel/150-mA configuration if the LEDSET resistor is missing or invalid. The LEDSET_STATUS fault bit is set in the BOOST_FAULT_STATUS register. The LEDSET resistor missing or invalid fault will not be monitored after initialization, so that the LP8866S-Q1 is operating in the configuration determined during initialization even though the LEDSET resistor is missing or invalid after initialization. 7.3.9.2.4 MODE Resistor Missing Faults (MODESEL) The MODE resistor missing or invalid is detected if the resistor is not assembled or not valid value as requested during the initialization. LP8866S-Q1 defaults to phase-shift PWM mode with I2C address 0x2A if the MODE resistor is missing or invalid. The MODESEL_STATUS fault bit will be set in the BOOST_FAULT_STATUS register. The MODE resistor missing or invalid fault is not monitored after initialization, so that the LP8866S-Q1 operates in the mode determined during initialization even though the MODE resistor is missing or invalid after initialization. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 33 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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