Rqonoff Input; Software Control; System Wakeup; Touch Panel - Applied Data Systems Bitsy Plus User Manual

Bitsy Plus User's Manual
Operating systems may allow the option to ignore power-failure interrupts. This allows systems to
run with lower input voltages without going to sleep. However, note that if the system does go to
sleep, it will not be able to wake until the input voltage is above Vsleep (see section 5.3.4 for
details)

RQOnOff Input

Operating systems and applications can configure the /RQONOFF signal (J3.45) to put the system
to sleep. In conjunction with the wakeup function (section 5.3.4, below), the /RQONOFF input
can be used as an "on/off" button for some systems. Electrical specifications are listed in section
6.2.7.

Software Control

Applications can put the system to sleep programmatically. Operating systems may also put the
system to sleep if the system has not been used for a certain amount of time or for other reasons.
In remote, battery-powered applications, software Sleep can be used in conjunction with the
Timed Wakeup feature (section 5.3.4) for minimum power consumption.
5.3.4

System Wakeup

This section describes several mechanisms for waking a Bitsy Plus system from Sleep mode. The
system will resume operation in Run mode unless the power supply voltage is lower than Vsleep
(section 6.2.2). If the input voltage is too low, the system will not wake under any circumstances.
This protects the RAM from getting corrupted by an under-voltage condition.
RQOnOff Input
Shorting the /RQONOFF signal (J3.45) to ground will wake the system. The signal is connected
to the system controller. Electrical specifications are listed in section 6.2.7.

Touch Panel

The touch panel controller interrupts the processor when touch panel events occur. Before going
to sleep, the processor can place the controller in a low-power sleep mode from which the
controller generates a wakeup interrupt when a touch event occurs.

Timed Wakeup

The StrongARM can wake up at a predetermined time. This feature is controlled by software.

ADSmartIO

The ADSmartIO controller controls the wakeup signal to the StrongARM. For production
applications, ADS can configure the ADSmartIO to wake up the system on specific events.
Contact ADS Sales if your application requires a special wakeup event.
Page 36 ADS document # 110114-1001A