Power Management
32
Sleep Mode
The MOSCAD
-
M will enter Sleep mode in the following situations:
•
Idle Sleep - All system and application tasks are idle.
•
Low Power Sleep - The main power supply falls below 8.9V.
Power consumption is minimized by switching off the power of all non-active circuits and
devices (communications inputs and outputs, etc). In Sleep mode, the unit’s power
consumption will be <5mA @ 14V DC.
In Sleep mode, the current consumption is <5mA. However, the
power consumption will be significantly higher if the AO is enabled or
the radio port is defined as a Wakeup event. If Port 3 is enabled in
Sleep mode, the power consumption will be 30mA and the radio
power consumption will be at least 40mA, for a total of at least
70mA.
When entering Idle Sleep mode, the following power supplies are disabled:
•
Radio/auxiliary power supply
•
AI power supply
•
AO power supply
•
SS1 and SS2 switches power supply
•
3.3V Peripheral power supply
•
Port 1 UART, Port 2 UART power supply
One or more of these power supplies might be left active, depending on the type of Wakeup
events that are selected. (See Wakeup events below.)
The AO power supply will not be disabled in Idle Sleep mode if a
value is set in the AO.
By default, The solid state SS1 and SS2 switches are controlled by
the Power Management feature. However, it is possible to configure
them to an independent operation mode where they are controlled
(enabled/disabled) by the user application only. If the unit enters Low
Power Sleep mode, SS1 and SS2 will be turned off even if set to
independent operation mode.
If one of several preprogrammed Wakeup events occurs, the unit will return from Idle Sleep
mode to Run mode. Those tasks which requested the Wakeup event will wake up and any
other tasks will remain suspended.
If, however, the unit is in Low Power Sleep mode, it will not respond to Wakeup events.
When a power level of 9.3V is restored at the power input, the unit will revert to its previous
mode.
