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NRF52820-QDAA-R Datasheet(PDF) 53 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 53 Page - Nordic Semiconductor |
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53 / 437 page  Power and clock management The power supply supervisor is illustrated in the following figure. POFCON.POF MUX VPOF MUX 2.8 V 1.8 V 1.7 V 4.2 V 2.8 V 2.7 V VDD VDDH VPOFH POFWARN VBOR Brownout reset Power-on reset C R VDD POFCON.THRESHOLD POFCON.POF (VDDH>VDD) POFCON.THRESHOLDVDDH Figure 17: Power supply supervisor 5.3.1.5 Power-fail comparator Using the power-fail comparator (POF) is optional. When enabled, it can provide an early warning to the CPU of an impending power supply failure. To enable and configure the power-fail comparator, see the register POFCON on page 64. When the supply voltage falls below the defined threshold, the power-fail comparator generates an event (POFWARN) that can be used by an application to prepare for power failure. This event is also generated when the supply voltage is already below the threshold at the time the power-fail comparator is enabled, or if the threshold is re-configured to a level above the supply voltage. 4463_156 v1.0 53 |
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