Eurotech PXA320, Руководство пользователя

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System Specification
110120-1000A
49
Reset and Wake Up Inputs
Header J22 , page 43 receives two reset signals. The RESET_IN# signal forces a “hard”
reset of the GCM. This signal also connects to the on-board reset switch SW1 , page 29 .
The GPIO_RESET# signal provides a “soft” reset to the PXA320. For the
GPIO_RESET# electrical specifications, see PXA320 Processor , page 47 .
The WAKEUP# signal available on header J13 , page 37 will wake the GCM from Sleep
mode. For a description of the Sleep mode, see Power Management Modes , page 24 .
Symbol Parameter Min Typ. Max Units
RESET_IN#, WAKEUP#
V
IH
High-level input voltage 2.3 V
V
IL
Low-level input voltage 0.5 V
R
PU
Pull-up resistance on
RESET_IN#, WAKEUP#
47 kΩ
V
PU
3.3 V
Display, VEE Adapter, and Backlight
The GCM provides the power, control, and data signals needed to drive LCDs, as well as
controls for brightness and contrast.
Header J6 , page 32 includes the display signals. The PXA320 LCD controller signals
LDD0 through LDD15, as well as the pixel clock, vertical sync, and horizontal sync, are
buffered and EMI/RFI filtered before reaching header J6. For a description of this
interface, see Display , page 19 .
Header J8 , page 34 supports an external LCD backlight inverter. For a description of this
interface, see Backlight , page 20 .
The GCM also supports an external VEE power supply on header J7 , page 33 . For a
description of this interface, see VEE Adapter , page 19 .
Symbol Parameter Min Typ. Max Units
LCD
I
PNL_PWR
Current limit 1.0 1.3 1.6 A
Contrast Control (passive displays)
VCON Low-voltage contrast adjust 0 3.3 V
Backlight
V
BL_VCC
Backlight supply voltage (note 12) V
V
BKLT_PWM
PWM control (note 13) 0 5 V
R
BKLT_ON#
Pull-up resistance on
BKLT_ON#
12 kΩ
V
BKLT_ON#
BL_VCC V
Notes:
12. On a standard GCM, V
BL_VCC
, is driven by the main input power V_IN. As a volume
production option, the GCM supports a backlight power that is independent of V_IN.
13. Support for backlight PWM control at 3.3 V and V_IN are available as volume production
options.