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PAC5255 Datasheet(PDF) 25 Page - Active-Semi, Inc |
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PAC5255 Datasheet(HTML) 25 Page - Active-Semi, Inc |
25 / 74 page PAC5255 Power Application Controller reinitialized. Only the persistent power manager status bits (resets and faults) are retained during hibernation. 10.3.5. Power and Temperature Monitor Whenever any of the VSYS, VCCIO, VCC33, or VCC18 power supplies falls below their respective power good threshold voltage, a fault event is detected and the microcontroller is reset. The microcontroller stays in the reset state until VSYS, VCCIO, VCC33, and VCC18 supply rails are all good again and the reset time has expired. A microcontroller reset can also be initiated by a maskable temperature fault event that occurs when the IC temperature reaches 170°C. The fault status bits are persistent during reset, and can be read by the microcontroller upon re-initialization to determine the cause of previous reset. A power monitoring signal VMON is provided onto the ADC pre-multiplexer for monitoring various internal power supplies. VMON can be set to be VCC18, 0.4•VCC33, 0.4•VCCIO, 0.4•VSYS, 0.1•VREGO, 0.1•VP, 0.0333•VHM, or the internal compensation voltage VCOMP for switching supply power monitoring. For power and temperature warning, a VP low event at 77% of the regulation voltage and an IC temperature warning event at 140°C are provided as maskable interrupts to the microcontroller. These warnings allow the microcontroller to safely power down the system. In addition to the temperature warning interrupt and fault reset, a temperature monitor signal VTEMP = 1.5 + 5.04e-3 • (T - 25°C) (V) is provided onto the ADC pre-multiplexer for IC temperature measurement. 10.3.6. Voltage Reference The reference block includes a 2.5V high precision reference voltage that provides the 2.5V reference voltage for the ADC, the DACs, and the 4-level programmable threshold voltage VTHREF (0.1V, 0.2V, 0.5V, and 1.25V). - 25 - Rev 1.10‒March 3, 2018 |
Número de pieza similar - PAC5255_18 |
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Descripción similar - PAC5255_18 |
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