Intermec 073290-001 用户手册
Chapter 4 — Theory of Operation
Dock Interface Signal Descriptions (continued)
Pin
Signal
Name
Name
Description
Signal Characteristics
12
TETH_PRE
SENT
SENT
Scanner interlock to mux internal and external
undecoded scanners.
undecoded scanners.
0 = undecoded scanner present
1 = no undecoded scanner present
1 = no undecoded scanner present
3.3V CMOS
22
TX+
Ethernet TX+
23 TX-
Ethernet
TX-
24
RX+
Ethernet RX+
25 RX-
Ethernet
RX-
USB Port
The CK30 supports USB 1.1 (12Mbps) client functionality through the
USB_D+, USB_D- and USB_5V signals on dock interface connector J13.
The USB client controller is built into the PXA255 processor (U2). When
the USB connection is used for serial port emulation, the operating system
maps it as COM1.
USB_D+, USB_D- and USB_5V signals on dock interface connector J13.
The USB client controller is built into the PXA255 processor (U2). When
the USB connection is used for serial port emulation, the operating system
maps it as COM1.
USB_5V (the 5V power supplied by the USB host) is used only to detect
the presence of a USB host; it is not used to power any CK30 hardware. It
is divided down to 3.3V levels by R157 and R160, and routed (as signal
USB_WAKE) to PXA255 interrupt input GPIO19. The USB software
driver responds to the interrupt by trying to connect to a USB host
through the PXA255 client controller.
the presence of a USB host; it is not used to power any CK30 hardware. It
is divided down to 3.3V levels by R157 and R160, and routed (as signal
USB_WAKE) to PXA255 interrupt input GPIO19. The USB software
driver responds to the interrupt by trying to connect to a USB host
through the PXA255 client controller.
If the CK30 is suspended, USB_WAKE can be configured to wake the
system through the DOCK_WAKE path: a high-going transition on
USB_WAKE propagates through U24, is debounced by R274, C147 and
U33, and then is differentiated by C180 and R321. The resulting pulse
goes through the resume logic on PXA255 GPIO1 (see “Resume Events”
on page 65), waking the system if this wakeup is enabled (HCR U16
output RESUME_EN is high).
system through the DOCK_WAKE path: a high-going transition on
USB_WAKE propagates through U24, is debounced by R274, C147 and
U33, and then is differentiated by C180 and R321. The resulting pulse
goes through the resume logic on PXA255 GPIO1 (see “Resume Events”
on page 65), waking the system if this wakeup is enabled (HCR U16
output RESUME_EN is high).
This feature is not supported in the current software.
Note that this wakeup method can be inhibited through U24 if the dock
port serial DCD is asserted (so CD_WAKE is high). But in most cases this
means the CK30 is already awake.
port serial DCD is asserted (so CD_WAKE is high). But in most cases this
means the CK30 is already awake.
RS-232 Port
The CK30 supports RS-232 communications through the serial signals on
dock interface connector J13. The signals are converted to true RS-232
levels by U23, and brought to the “FF” UART built into the PXA255
processor. The operating system maps this port as COM2.
dock interface connector J13. The signals are converted to true RS-232
levels by U23, and brought to the “FF” UART built into the PXA255
processor. The operating system maps this port as COM2.
CK30 Handheld Computer Service Manual
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