Power Management; Overview; Run Mode - Motorola MOSCAD-M Owner's Manual

POWER MANAGEMENT

Overview

The MOSCAD-M includes a Power Management feature which is controlled by the user
application. The unit can operate in four power save modes:
•
Power Management Disabled (in which the entire system is operational and no power
saving technique is used)
•
Run mode (in which the entire system is operational and power is provided only to active
ports of the unit)
•
Idle Sleep mode (in which the unit uses low power)
•
Low Power Sleep mode (in which the unit is basically off)
When the MOSCAD-M is powered up, it operates in Run mode. If all application and system
tasks are idle, and the Power Management Feature is enabled, the RTU will enter Idle Sleep
mode in order to conserve power. The unit will return to Run mode if one of several Wakeup
events occurs.
If the input power falls below 8.9V, the unit automatically enters Low Power Sleep mode. The
unit will return to its previous mode (Run or Idle Sleep) when the input power returns to at
least 9.3V.
The Power Management Feature, which is disabled by default, can
be enabled by the user application.

Run Mode

In Run mode, tasks will execute, suspend and exit, as necessary. In order to execute, each
application and system task will request a 'visa' from the 'visa manager'. When the task
suspends or exits, its visa is returned. If all visas in the system have been returned, the unit
can enter Idle Sleep mode. A task can choose to operate without a visa; however, it may be
forced into Idle Sleep mode by the system when all other tasks have returned their visas.
Before a task suspends itself, it will define those Wakeup events which will cause it to wake
up. When the requested Wakeup event occurs, the task will receive a signal and awaken (even
if the Power Management feature is disabled.) If one of these events occurs while the system
is in Run mode, it will prevent the system from entering Idle Sleep mode.
Total power consumption from the main power supply in Run mode is at most 150mA @ 14V
DC. Typically, power consumption will be 50mA. The additional power consumed by the
radio in Run mode depends on the radio type and will be at least 40mA.
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