Resume Events - Intermec CK30 Service Manual

Resume Events

Source
I key (Suspend/Resume)
RTC Alarm
Tethered Scanner trigger
("Trigger Resume" )
Keypad scanner Button
("Trigger Resume" )
Handle trigger ("Trigger
Resume" )
1, 2, and 3 keys on the
keypad
ActiveSync connection
(DCD from docking serial
port)
ActiveSync connection
(USB host present)
Mini PCI card PME
(power management
event)
Bluetooth wakeup
SD card insertion
* Devices routed to PXA255 interrupts other than GPIO0 and GPIO1 are not able to wake the system after a battery
replacement or other critical battery event because in such an event the PXA255 automatically disables all wakeup
interrupts except GPIO0 and GPIO1.
CK30 Handheld Computer Service Manual
In addition to the I key, the CK30 is designed to optionally wake from
the following sources.
Wakes after
battery
replaced* Implementation
Yes
No Not supported in current software
Yes Not supported in current software
A tethered scanner left powered during Suspend can pull the
SCAN_TRIG* signal (or DOCK_TRIG*, if it is connected through the
dock port) low on a trigger pull. The signal propagates through
combinatorial logic U22, U28, U31 and U54 to flip-flop U57, which
ensures even narrow pulses trigger the PXA255 GPIO1 edge-detect logic.
Yes Not supported in current software.
These all reside on Row 0 of the keypad matrix (KEYRET0), which is
Yes routed to PXA255 GPIO1 as well as to the FPGA. Each of these keys is
enabled as a resume source by driving its keypad column line low on
Suspend. A key closure then pulls GPIO1 low, waking the system.
Yes
Yes Not supported in current software
Serial port DCD and USB_WAKE (divided down from the 5V supplied
by a USB host) are OR'd together by U24, RC filtered, and
differentiated by RC pair C180/R321 to present a high-going pulse on
Yes
signal DOCK_WAKE. This goes through the same combinatorial logic
as the tethered scanner signals described above, waking the system
through PXA255 GPIO1.
No Not supported in current software.
PCI_PME* from the Mini PCI card bypasses the FPGA PCI bridge
(which is powered down in Suspend) and wakes the system through
PXA255 GPIO4.
No Not supported in current software.
The serial data signal from the Bluetooth module (BT_RXD*) is routed
to PXA255 GPIO2, which is set to detect edges, wakes the system on
any serial message from the Bluetooth module.
No Not supported in current software
Supported through signal SDMMC_CD on PXA255 GPIO5.
all instances, BATT_FAULT* globally inhibits resume when the main
In
battery is too low or removed and external power is not present.
Chapter 4 — Theory of Operation
65