QT1106-ISG View Datasheet(PDF) - Quantum Research Group

Part Name

Description

Manufacturer

QT1106-ISG

QWHEEL™/QSLIDE™/QTOUCH™ IC

Quantum Research Group 

2.6 QMagicTM Proximity Sensor

Key 7 (SNSB7) can be optimized for operation as a hand

proximity sensor via the serial interface (see Section 3.5.2,

Prox = 1). The proximity sensitivity of channel 7 can be

increased by a higher value of Cs. The AKS mode should be

set to mode 101, to ensure that the proximity key does not

lock out other keys or the wheel/slider.

Note that proximity fields are often unstable especially in

products that can move around, such as mobile phones and

MP3 players. In particular, the proximity channel can stick on

after a detection. As soon as possible after proximity

channel 7 becomes active, it should be recalibrated via the

serial interface (see Section 3.5.2, CalK = 1, Cal Key Num

bits = 111) in order to clear the proximity channel .

Design of proximity electrodes requires care, so as to ensure

that the electrode area is maximized whilst ensuring

adequate and easy coupling to a hand as it approaches the

equipment.

2.7 Faulty and Unused Keys

Any sense channel that does not have its sense capacitor

(Cs) fitted is assumed to be either faulty or unused. This

channel takes no further part in operation unless a

host-commanded recalibration operation shows it to have an

in-range burst count again.

This is important for sense channels that have a n open or

short circuit fault across Cs. Such channels would otherwise

cause very long acquire bursts, and in consequence would

slow the operation of the entire QT1106.

Lq

5

QT1106-ISG R8I.05/0906

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