KYE Systems Corp GMPAD Manual Do Utilizador
Cyber Scroll Tablet working theory :
Fig 4 is a function block diagram of Cyber Scroll Tablet.
Function Block description :
1. The micro-controller (72) generates control signal to each portion . For example,
It enables the X-Y-axis scanning circuit (30), control the drive signal on/off, and read
button status from push Button demodulator (71),then send coordinate position to PC
via PSII interface.
It enables the X-Y-axis scanning circuit (30), control the drive signal on/off, and read
button status from push Button demodulator (71),then send coordinate position to PC
via PSII interface.
2. Clock generator (74) generates system clock to micro-controller (72) , and provides
Clock to counting output circuit(76) to generates a sinusoidal signal of 345.6KHz , the
Counting output circuit drives the coil (20) to generates magnetic flux for PEN (200)
( or mouse PUCK) device energy.
Clock to counting output circuit(76) to generates a sinusoidal signal of 345.6KHz , the
Counting output circuit drives the coil (20) to generates magnetic flux for PEN (200)
( or mouse PUCK) device energy.
3. The PEN (and mouse PUCK) device(200) didn’t have power inside , it will induce
the power from Cyber Scroll tablet while application.
the power from Cyber Scroll tablet while application.
4. X-Y axis signal-scanning circuit (30) bypass the PEN ( or mouse PUCK ) feedback
signal .
signal .
But how did they work together ?
Normally the micro-controller(72) enable the counting output circuit(76) to drive
the coil(20) to generate magnetic flux and control the X-Y axis signal scanning circuit
(30) to scan antenna area . It will get the energy by magnetic flux and feedback to
antenna area (10). when PEN( or mouse PUCK(200)) is applied on the tablet surface ,
the coil(20) to generate magnetic flux and control the X-Y axis signal scanning circuit
(30) to scan antenna area . It will get the energy by magnetic flux and feedback to
antenna area (10). when PEN( or mouse PUCK(200)) is applied on the tablet surface ,
The X-Y axis signal scanninng circuit(30) which is composed of analog mutiplxer
And it is connect to amplifier circuit (40) , the scanning circuit bypass the magnetic
flux signal feedback from PEN(or mouse PUCK) to amplifier circuit(40).
And it is connect to amplifier circuit (40) , the scanning circuit bypass the magnetic
flux signal feedback from PEN(or mouse PUCK) to amplifier circuit(40).
The amplifier circuit (40) will send out the magnetic flux signal by two ways,
One is a limiting circuit (50),the other one is synchronic determination circuit (60).
One is a limiting circuit (50),the other one is synchronic determination circuit (60).
The limiting circuit (50) restricts the signal amplitude and provides the limited
signal to push-button demodulator (71) to detect which button is pressed on PEN( or
mouse PUCK).
signal to push-button demodulator (71) to detect which button is pressed on PEN( or
mouse PUCK).
The magnetic flux signal and noise signal is mixed together . Synchronous
determination circuit (60) is extracted the magnetic flux signal and send it to
coordinate detection circuit (62).
determination circuit (60) is extracted the magnetic flux signal and send it to
coordinate detection circuit (62).
Micro-controller (72) will detect the coordinate and button status from coordinate
Detection circuit (62) output signal and push-button demodulator circuit (71) output
signal.
Detection circuit (62) output signal and push-button demodulator circuit (71) output
signal.
Then micro-controller (72) process these signal ( coordinate signal and button
Status signal ) and send to PC via PSII interface .
Status signal ) and send to PC via PSII interface .