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LP3913 数据表(PDF) 45 Page - Texas Instruments |
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LP3913 数据表(HTML) 45 Page - Texas Instruments |
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45 / 70 page  ADC executes conversion request System CPU services IRQ CPU reads data Start cid reg data start stop cid reg data start stop Select adc source End CPU sends next start conversion command ? cid reg Cid/R start stop start reg Y N I2C transfers CPU sends start conversion command to ADC Conversion done pulls down IRQB line LP3913 www.ti.com SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013 Interrupt Request Output The LP3913 has the ability to interrupt the system processor through the open drain IRQB pin, which transitions to an active logic low level upon the following 8 events: • USB Power detected • USB disconnected • CHG_IN Power detected • CHG_IN Disconnected • Battery low alarm • Thermal Alarm • ADC conversion completed • Charger safety timer time-out The events form the interrupt sources that correspond to a certain bit location in the Interrupt Request (IRQ) Register. All interrupt sources can be masked by the Interrupt Mask Register (IMR). Masking the interrupt prevents the interrupt event from asserting the IRQB pin, yet the event will still be captured in the IRQ register, which allows the processor to poll the interrupt sources. After an active low IRQB has been detected by the system processor, the latter services the interrupt and will access the IRQ register to determine which source was responsible for the interrupt request. Reading the IRQ register will automatically clear the register to enable the capture of the next interrupt events. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 45 Product Folder Links: LP3913 |
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