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QT320 Schematic ( PDF Datasheet ) - Quantum

Teilenummer QT320
Beschreibung 2-CHANNEL PROGAMMABLE ADVANCED SENSOR IC
Hersteller Quantum
Logo Quantum Logo 




Gesamt 18 Seiten
QT320 Datasheet, Funktion
LQ
QPROXQT320
2-CHANNEL PROGAMMABLE ADVANCED SENSOR IC
Two channel digital advanced capacitive sensor IC
Projects two ‘touch buttons’ through any dielectric
Cloning for user-defined sensing behavior
100% autocal - no adjustments required
Only one external capacitor per channel
User-defined drift compensation, threshold levels
Variable gain via Cs capacitor change
Selectable output polarities
Toggle mode / normal mode outputs
HeartBeat™ health indicator on outputs (can be disabled)
1.8 ~ 5V supply, 60µA
APPLICATIONS
Light switches
Industrial panels
Appliance control
Security systems
Access systems
Pointing devices
Computer peripherals
Entertainment devices
The QT320 charge-transfer (“QT’”) touch sensor chip is a self-contained digital IC capable of detecting near-proximity or
touch on two sensing channels. It will project sense fields through almost any dielectric, like glass, plastic, stone, ceramic,
and most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them respond to proximity
or touch. This capability coupled with its ability to self calibrate continuously can lead to entirely new product concepts.
It is designed specifically for human interfaces, like control panels, appliances, security systems, lighting controls, or
anywhere a mechanical switch or button may be found; it may also be used for some material sensing and control
applications provided that the presence duration of objects does not exceed the recalibration time-out interval.
The IC requires only a common inexpensive capacitor per channel in order to function.
Power consumption and speed can be traded off depending on the application; drain can be as low as 60µA, allowing
operation from batteries.
The IC’s RISC core employs signal processing techniques pioneered by Quantum; these are specifically designed to make
the device survive real-world challenges, such as ‘stuck sensor’ conditions and signal drift. Even sensitivity is digitally
determined. All key operating parameters can be set by the designer via the onboard eeprom which can be configured to alter
sensitivity, drift compensation rate, max on-duration, output polarity, and toggle mode independently on each channel.
No external switches, opamps, or other analog components aside from Cs are usually required.
The Quantum-pioneered HeartBeat™ signal is also included, allowing a host controller to monitor the health of the QT320
continuously if desired; this feature can be disabled via the cloning process.
By using the charge transfer principle, the IC delivers a level of performance clearly superior to older technologies in a highly
cost-effective package.
AVAILABLE OPTIONS
TA
00C to +700C
-400C to +850C
SOIC
-
QT320-IS
8-PIN DIP
QT320-D
-
LQ
Copyright © 2002 QRG Ltd
QT320/R1.03 08/02






QT320 Datasheet, Funktion
Figure 1-9 Bursts when SC > 0
1.5 TIMING
The QT320 runs two sensing bursts, one per channel, each
acquisition cycle (Figure 1-9). The bursts are successive in
time, with Channel 2 firing first.
The basic QT320 timing parameters are:
Ti
Tbs
Tbd1
Tbd2
Tbd
Tmod
Tdet
Basic timing interval
Burst spacing
Burst duration, Channel 1
Burst duration, Channel 2
Burst duration, Ch1 + Ch2
Max On-Duration
Detection response time
(1.5.1)
(1.5.1)
(1.5.2)
(1.5.2)
(1.5.2)
(1.5.3)
(1.5.4)
Figure 1-10 Bursts when SC = 0
(750K resistor in series with scope probe)
Figure 1-11 Burst detail
1.5.1 BURST SPACING: TI, SC, TBS
Between acquisition bursts, the device can go into a low
power sleep mode. The percentage of time spent in sleep
depends on the burst spacing and the combined burst lengths
of both channels; if the burst lengths occupy all of the sleep
interval, no time will be spent in sleep mode and the part will
operate at maximum power drain.
The burst spacing is a multiple of the basic timing interval Ti;
Ti in turn depends heavily on Vdd (see Section 2.1 and Figure
5.7). The parameter Sleep Cyclesor SC is the user-defined
Setup value which controls how many Ti intervals there are
from the start of a burst on Channel 2 until the start of the
next such burst. The resulting timing is Tbs:
Tbs = SC x Ti
where SC > 0.
All the basic timing parameters of the QT320 such as
recalibration delay etc. are dependent on Tbs.
If SC = 0, the device never sleeps between bursts (Figure
1-10). This mode is fast but consumes maximum power; it is
also unregulated in timing from burst to burst, depending on
the combined burst lengths of both channels.
Conversely if SC >> 0, the device will spend most of its time
in sleep mode and will consume very little power, but it will be
slower to respond.
By selecting a supply voltage and a value for SC, it is possible
to fine-tune the circuit for the desired speed / power tradeoff.
1.5.2 BURST DURATIONS: TBD1, TBD2, TBD
The two burst durations depend entirely on the values of Cs
and Cx for the coresponding sensing channel, and to a lesser
extend, Vdd. The bursts are composed of hundreds of
charge-transfer cycles (Figure 1-11) operating at about
500kHz. Channel 2 always fires first (Tbd2) followed by
Channel 1 (Tbd1); the sum total of the time required by both
channels is parameter Tbd.
lQ
6
QT320/R1.03 08/02

6 Page









QT320 pdf, datenblatt
TABLE 4-1 SETUPS SUMMARY CHART
Description
Threshold
Hysteresis
Det Integrator A
Channel 1
Specific
Det Integrator B
Max-On Duration
Symbol
THR1
HYS1
DIAT1
DIBT1
MOD1
Output Mode
OUT1
Channel 2
Specific
Threshold
Hysteresis
Det Integrator A
Det Integrator B
Max-On Duration
THR2
HYS2
DIAT2
DIBT2
MOD2
Output Mode
OUT2
Features
Common
To Both
Channels
DI Speed
Negative Drift
Compensation
Positive Drift
Compensation
Sleep Cycles
DIS
NDC
PDC
SC
Valid Values
1 - 16
0 - 16
-
-
1 - 256
-
1-6
-
0 - 254
255
0
Finite
Infinite
Active Low
1 Active High
2 Toggle
1 - 16
-
0 - 16
1 - 256
-
-
1-6
-
0 - 254
255
0
1
Finite
Infinite
Active Low
Active High
2 Toggle
0 Slow
1
0 - 254
255
Fast
On
Off
0 - 254
255
0
On
Off
No Sleep
1 - 255
Sleep
Default
6
2
10
6
14 (~10s at 3V)
Calculation / Notes
Higher = less sensitive
Higher = more hysteresis
Higher = longer to detect, more noise immune
Value taken from DIAT1 but truncated to 6
SC = 0
Tmod = (MOD1 + 1) x 256 x Tbs (note1)
SC > 0
Tmod = (MOD1 + 1) x 16 x Tbs (note2)
0 Requires pullup resistor on OUT1
6
2
10
6
14 (~10s at 3V)
Higher = less sensitive
Higher = more hysteresis
Higher = longer to detect, more noise immune
Value taken from DIAT2 but truncated to 6
SC = 0
SC > 0
Tmod = (MOD2 + 1) x 256 x Tbs (note1)
Tmod = (MOD2 +1) x 16 x Tbs (note2)
0 Requires pullup resistor on OUT2
1
2 (~0.13s/bit
@ 3V)
100 (~4.36s/bit
@ 3V)
1 (~47ms Tbs
@ 3V)
SC = 0
SC > 0
SC = 0
SC > 0
-
-
Tndc = (NDC + 1) x 16 x Tbs (note1)
Tndc = (NDC + 1) x Tbs
(note2)
Tpdc = (PDC + 1) x 16 x Tbs (note1)
Tpdc = (PDC + 1) x Tbs
(note2)
Burst rep interval = Tbs = SC x Ti
Note 1: Tbs is the combined (summed) burst duration of Channel1 and Channel2 (Tbd).
Note 2: Tbs is variable with the voltage, see figure 5-7. If Tbd is longer than 10ms,Tbs is Tbd plus the sleep time find on figure 5-7.
Note 5: The sleep period time is find on figure 5-7(equivalent at 1 sleep period).
Unit
Counts
Counts
Burst Cycles
Seconds
-
-
-
Counts
Counts
Burst Cycles
Seconds
-
-
-
-
-
Seconds / bit
change
Seconds / bit
change
Counts
lQ
12
QT320/R1.03 08/02

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