Reset Control - Intermec CK30 Service Manual

Red LED States
Power state
No Battery
Low Battery
Good Battery
Warm Boot
Cold Boot

Reset Control

CK30 Handheld Computer Service Manual
Indication
Red LED off.
The red CK30 LED turns on continuously while
CK30 is running once battery voltage falls below the
software low-battery threshold. This continues until
Suspend – either by the I key or when the battery
falls below the hardware critical battery threshold.
Red LED flashes twice when:
The IO key is pressed when the CK30 is suspended
and the battery is too low to resume.
The battery level crosses below the hardware critical
battery threshold.
The main battery is removed.
Red LED off.
Red LED flashes once when the warm boot
completes.
Red LED flashes three times when the PSC comes
out of reset and initiates the cold boot, then once
more when the boot completes.
Hard Reset (Cold Boot)
Pushbutton switch SW1 (inside the battery compartment) is used for user-
commanded hard reset in the CK30.
Hard reset asserts the PSC (U38) reset input, which in turn asserts the
PXA255 reset input once a good main battery is installed. This clears all
PXA255 functions to a known state and asserts the PXA255 reset output,
resetting the system flash.
Chapter 4 — Theory of Operation
Comments
PSC turns off the LED when it
sees system has suspended
(PWR_EN=0).
All instances of the red LED
flashing are driven directly by
the PSC.
The power management driver
commands the single flash. This
is a momentary false "low-
battery" indication that results
from the time needed to
average enough battery level
samples to exceed the software
low-battery threshold.
The three flashes are driven
directly by the PSC.
The power management driver
commands the single flash. This
is a momentary false "low-
battery" indication that results
from the time needed to
average enough battery level
samples to exceed the software
low-battery threshold.
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