PAC5220 Datasheet, PDF (24/73 Pages) Active-Semi, Inc – Power Application Controller

PAC5220
Power Application Controller
are shut down to eliminate power drain from the output supplies. The system exits hibernate mode after a wake-
up timer duration (configurable from 125ms to 8s or infinite) has expired or, if push button enabled, after an
additional push button event has been detected. When exiting the hibernate mode, the power manager goes
through the start up cycle and the microcontroller is 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).
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Rev 1.0‒February 25, 2014