Detecting the Peripheral
E-3
Figure E-2 Stylistic 1200 Pen Tablet DC Contact Dimensions
Detecting the Peripheral
Since the 16-volt DC power input and 5-volt DC output positions are relatively close to each other, a
potential over-voltage hazard exists (i.e. 16 volts could be inadvertently applied to the 5-volt output if the
16-volt pin on a cradle device touches the 5-volt contact on the pen tablet) which could damage
peripherals connected to the high-usage contacts. So, peripherals which provide power to the pen tablet
should
detect the presence of the pen tablet before turning on the 16-volt line
. Also, consider
implementing over-voltage protection on the 5-volt line to protect peripherals connected to the 5-volt line
down stream.
The pen tablet detects the presence of a peripheral device connected to the high-usage contacts when
position 2 (the Detect signal) is grounded by the peripheral. Unfortunately, the pen tablet does not
provide such a detect signal to allow the
peripheral
to detect the presence of the
pen tablet
, so the
peripheral must detect the presence of the pen tablet by some other means.
One way for a peripheral to detect the pen tablet (and confirm that it is properly connected) is to monitor
position 4 for the presence of 5 volts DC (pen tablet on) or zero volts (pen tablet off or suspended).
When either of these conditions exist, the 16-volt line can safely be turned on.
Note:
Other methods (such as microswitches or other mechanical designs) could be used to detect the presence of
the pen tablet.
Microsoft Corp. Exhibit 1020
Summary of Contents for Stylistic 2300
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