qt1106 Quantum Research Group, qt1106 Datasheet - Page 13

• Manufacturer Part Number: qt1106
• Description: Qwheel?/qslide?/qtouch? Ic Touch Screen
• Manufacturer: Quantum Research Group

4.5 Sync Mode
This mode is useful for low frequency noise suppression, for
example from mains frequencies in line-operated appliances.
Acquisition bursts are synchronized to the /SS-wake pulses
from the host.
Sync mode is very similar to ‘LP 760ms response time’
mode, with two differences:
Lq
•
•
It does not operate as in Free Run mode when a
touch is first detected
The LPB bit is ignored and a burst is always
generated after each /SS wakeup or SPI transfer as if
LPB = 1
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Not operating as in Free Run mode when a touch is first
detected (before DI confirmation has taken place) means that
acquisition bursts are restricted to the immediate time after a
sync signal (/SS), heightening the effect of low frequency
noise suppression.
In many applications of Sync mode the DI filter will need to
be set to two counts, to avoid the QT1106 response time
being unacceptably lengthened as a consequence of this.
QT1106_8IR0.07_0907