Specifications

26
THEORY OF OPERATION
Idle Mode
The scanner is not operating, but not sleeping and is fully powered. The CPU
and image sensor are in the idle mode, the wakeup from which does not require
the image sensor reprogramming.
PWRDWN Pin State: De-asserted (LOW).
Transition to Idle Mode:
• The scanner is turned to Idle Mode from Operating Mode immediately
when no tasks are running in the scanner.
• The scanner is turned to Idle Mode from Sleep or Presentation Wakeup
Modes upon the reception of the nWake signal.
Sleep Mode
The scanner is sleeping, but is fully powered. The CPU is in sleep mode. The
image sensor is in standby mode, the wakeup from which requires the image
sensor reprogramming (which is done automatically in the scanner software).
PWRDWN Pin State: De-asserted (LOW).
Transition to Sleep Mode:
• The scanner is turned to Sleep Mode from Idle Mode upon the
expiration of the “sleep” timeout, which is set to 1 second by default.
The “sleep” timeout is restarted every time the scanner enters the Idle
Mode.
• The scanner can be turned to Sleep Mode from Operating Mode or Idle
Mode immediately upon the reception of a special single-byte serial
command from the host. The byte value is configurable.