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Número de pieza QT1081
Descripción 8-KEY QTOUCH SENSOR IC
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QT1081 datasheet

1 Page

QT1081 pdf
1.3 Wiring
Table 1.1 Pinlist
32-QFN
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Name
SS
/RST
Vdd
OSC
n/c
SNS0
SNS0K
SNS1
SNS1K
SNS2
SNS2K
SNS3
SNS3K
SNS4
SNS4K
SNS5
SNS5K
SNS6
SNS6K
SNS7
SN7K
Vss
SYNC/LP
DETECT
OUT_0
OUT_1
OUT_2
OUT_3
OUT_4
OUT_5
OUT_6
OUT_7
Type
OD
I
Pwr
I
-
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Pwr
I
O/OD
O/OD
O/OD
O/OD
O/OD
O/OD
O/OD
O/OD
O/OD
Function
Notes
If Unused
Spread spectrum
Reset input
Power
Oscillator
-
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin
Sense pin and
option select
Sense pin and
mode select
Sense pin and mode
or option select
Sense pin
Ground
Sync In or LP In
Detect Status
Out 0
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
Out 7
Spread spectrum drive
100K resistor to Vss
Active low reset
Vdd
+2.8 ~ +5.0V
-
Resistor to Vdd and optional
spread spectrum RC network
Leave open
-
-
To Cs0 and/or
option resistor
To Cs0 + Key
Option resistor
Open
To Cs1 and/or
option resistor*
Open or
option resistor*
To Cs1 + Key
Open
To Cs2 and/or
option resistor*
To Cs2 + Key
Open or
option resistor*
Open
To Cs3 and/or
option resistor*
To Cs3 + Key
Open or
option resistor*
Open
To Cs4 and/or
option resistor*
Open or
option resistor*
To Cs4 + Key
Open
To Cs5 and/or
option resistor*
Open or
option resistor*
To Cs5 + Key
Open
To Cs6 and/or
option resistor*
Open or
option resistor*
To Cs6 + Key and/or
mode resistor
To Cs7 and/or mode resistor
or option resistor*
Open or
mode resistor
Open or mode resistor
or option resistor*
To Cs7 + Key
Open
0V -
Rising edge sync or LP pulse Vdd or Vss
Active = any key in detect
Open
Also, binary coded output 0
Open
Also, binary coded output 1
Open
Also, binary coded output 2
Open
Open
Open
In binary coded mode,
are clamped internally
these pins
to Vss
Open
Open
Open
Pin Type
I CMOS input only
I/O CMOS I/O
O CMOS push-pull output
OD CMOS open drain output
O/OD CMOS push pull or open-drain output (option selected)
Pwr Power / ground
Notes
Mode resistor is required only in Simplified mode (see Figure 1.2)
* Option resistor is required only in Full Options mode (see Figure 1.1)
Pin is either Sync or LP depending on options selected (functions SL_0, SL_1, see Figure 1.1)
lQ
5
QT1081_1R0.04_0307

5 Page

QT1081 arduino
In many applications, it is desirable to sense touch at high
speed. Examples include scrolling ‘slider’ strips or ‘Off’
buttons. It is possible to place the device into a ‘Fast Detect’
mode that usually requires under 10ms to respond. This is
accomplished internally by setting the Detect Integrator to only
two counts, i.e. only two successive detections are required to
detect touch.
In LP mode, ‘Fast’ detection will not speed up the initial delay
(which could be up to 340ms nominal depending on the option
setting). However, once a key is detected the device is forced
back into normal speed mode. It will remain in this faster
mode until requested to return to LP mode.
When used in a ‘slider’ application, it is normally desirable to
run the keys without AKS.
In both normal and ‘Fast’ modes, the time required to process
a key release is the same. It takes six sequential
confirmations of nondetection to turn a key off.
Fast Detect mode can be enabled as shown in Tables 1.2 and
1.6.
2.10 Simplified Mode
A simplified operating mode which does not require the
majority of option resistors is available. This mode is set by
connecting a resistor labelled SMR between pins SNS6K and
SNS7 (see Figure 1.2).
In this mode there is only one option possible - AKS enable or
disable. When AKS is disabled, Fast Detect mode is enabled;
when AKS is enabled, Fast Detect mode is off.
AKS in this mode is Global only (i.e. operates across all
functioning keys).
The other option features are fixed as follows:
OUT_n, DETECT Pins: Push-pull, active high,
one-per-key outputs
SYNC/LP Function: LP mode, ~180ms response time
Max On-Duration: 60 seconds
See Tables 1.6 and 1.7.
2.11 Unused Keys
Unused keys should be disabled by removing the
corresponding Cs, Rs, and Rsns components and connecting
SNS pins as shown in the ‘Unused’ column of Table 1.1.
Unused keys are ignored and do not factor into the AKS
function (Section 2.7).
lQ
10
QT1081_1R0.04_0307

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