AT42QT1010-TSHR QS446 Atmel, AT42QT1010-TSHR QS446 Datasheet - Page 6

• Manufacturer Part Number: AT42QT1010-TSHR QS446
• Manufacturer: Atmel

Specifications of AT42QT1010-TSHR QS446

• Lead Free Status / Rohs Status: Compliant

3.2
6
Threshold
AT42QT1010
Figure 3-3.
However, once SYNC mode has been entered, if the SYNC signal consists of a series of short
pulses (>10 µs) then a burst will only occur on the falling edge of each pulse
page
In SYNC mode, the device will sleep after each measurement burst (just as in LP mode) but will
be awakened by a change in the SYNC signal in either direction, resulting in a new
measurement burst. If SYNC remains unchanged for a period longer than the LP mode sleep
period (about 80 ms), the device will resume operation in either Fast or LP mode depending on
the level of the SYNC pin
There is no detect integrator (DI) in SYNC mode (each touch is a detection) but the Max
On-duration will depend on the time between SYNC pulses; see
Recalibration timeout is a fixed number of measurements so will vary with the SYNC period.
Figure 3-4.
The internal signal threshold level is fixed at 10 counts of change with respect to the internal
reference level, which in turn adjusts itself slowly in accordance with the drift compensation
mechanism.
The QT1010 employs a hysteresis dropout of two counts of the delta between the reference and
threshold levels.
6) instead of on each change of SYNC signal, as normal
SYNC
SYNC
SNSK
SNSK
SYNC Mode (Triggered by SYNC Edges)
SYNC Mode (Short Pulses)
SNSK
SYNC
(Figure
>10us
sleep
sleep
3-3).
sleep
sleep
>10us
>10us
slow mode sleep period
slow mode sleep period
sleep
sleep
(Figure
Section 3.3
3-3).
Revert to Slow Mode
Revert to Fast Mode
and
(Figure 3-4 on
9541G–AT42–03/10
Section
3.4.