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QST108KU0 Datasheet(PDF) 8 Page - STMicroelectronics

Part # QST108KU0
Description  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

QST108KU0 Datasheet(HTML) 8 Page - STMicroelectronics

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QST touch sensing technology
QST108
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3
QST touch sensing technology
3.1
Functional description
QST devices employ bursts of charge-transfer cycles to acquire signals. Burst mode permits
low power operation, dramatically reduces RF emissions, lowers susceptibility to RF fields,
and yet permits excellent speed. Signals are processed using algorithms pioneered by
Quantum which are specifically designed to provide reliable, trouble-free operation over the
life of the product.
The QST switches and charge measurement hardware functions are all internal to the
device. An external CS capacitor accumulates the charge from sense-plate CX, which is
then measured. Larger values of CX cause the charge transferred into CS to rise more
rapidly, reducing available resolution. As a minimum resolution is required for proper
operation, this can result in dramatically reduced gain. Larger values of CS reduce the rise
of differential voltage across it, increasing available resolution by permitting longer QST
bursts. The value of CS can thus be increased to allow larger values of CX to be tolerated.
The device is responsive to both CX and CS, and changes in either can result in substantial
changes in sensor gain.
Figure 2.
QTouch™ measuring circuitry
3.2
Spread-spectrum operation
The bursts operate over a spread of frequencies, so that external fields will have minimal
effect on key operation and emissions are very weak. Spread-spectrum operation works
with the Detection Integrator mechanism (DI) to dramatically reduce the probability of false
detection due to noise.
Ai12569
SNS_SCKn
SNSK_SCKn
Sense capacitor
CS (a few nF)
Cx (~20 pF)
CT (~5 pF)
Earth
Serial resistor
RS (10 kΩ)


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