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參數資料
| 型號： | SH2165-FGT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-64 |
| 文件頁數： | 30/33頁 |
| 文件大?。?/td> | 354K |
| 代理商： | SH2165-FGT |
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PIXIPOINT BUILT-IN FEATURES
PIXIPOINT SIGNAL CONDITIONING CIRCUIT
Copyright 1999-2005 Semtech Corporation
SH2165 data sheet v1.08 (2005-05-17)
www.semtech.com
6
SH2165
Tap — Select
Double Tap — Execute
Press Hold — Drag
EasyDrag — reduces the speed
of the cursor when the user is
dragging an object on the desktop,
making it simple to accurately
handle the object
CleanStop — ensures that the
cursor stops precisely
The PixiPoint interfaces with a sensor that has four strain gauges – one on
each of the sides. If force is applied precisely in the X direction, it produces
a change of resistance of only the two X gauges. Force in the Y direction
causes changes only in the Y gauges. One of the pair of gauges increases,
while the other decreases in resistance.
If the user presses on the sensor from the top (Z axis), all of the strain
gauges decrease in resistance.
When the test current is passed through the gauges, these resistance
changes are converted into voltage changes. These signals are very small,
typically under 1 mV Full Scale.
The signal conditioning circuit balances and amplifies the incoming signals
for digitizing by a built-in A/D converter.
Semtech’s circuit can correct a significant imbalance between the gauges in
each X and Y pair (± 25%), allowing relaxed manufacturing tolerances for
the sensors and cabling. There is no performance degradation over the full
operating temperature range, and no degradation for large temperature
gradients between the paired gauges.
The SH2165 supports a keyboard backlight and four LEDs: Num Lock,
Caps Lock, Scroll Lock, and Katakana Lock. The Katakana Lock LED also
serves as an emergency signal.
Three special keys can be defined in the keyboard matrix that affect the
backlight and the LEDs.
When the backlight increment key (BLINC) is pressed, the SH2165 cycles
through backlight states, from backlight off (the default starting state), to half
intensity, to full intensity, to off, and so on.
When the blackout key (BLKOUT) is pressed, the backlight and all LEDs
are turned off; when it is pressed again, the backlight and all LEDs are
returned to their former state. (Note that the blackout key affects the
external lights only; it does not affect the internal state or operation of the
keyboard; for example, it turns off the Num Lock LED, but it does not affect
the Num Lock state.)
When the emergency key (ALERT) is pressed, the emergency LED (the
Katakana Lock LED) turns on for 30 seconds, then turns off.
The pins BKLTON and BKLT50 (pins 51 and 52) control the backlight
circuit. If no backlight is used, leave these pins floating.
LEDS AND BACKLIGHT
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