Table 1-1 Pin Listing
QT140 / QT150 SSOP-28
Pin Name
QT140 / QT150 DIP-28
Pin Name
Description
Description
Positive power
1
2
3
4
5
6
7
8
9
Vss
Negative power (Ground)
Negative power (Ground)
Positive power
1
2
3
4
5
6
7
8
9
Vdd
Vss
Vdd
Positive power
Vdd
Vss
Negative power (Ground)
Negative power (Ground)
Negative power (Ground)
Sense pin (to Cs1, electrode)
Sense pin (to Cs1)
Vdd
Positive power
Vss
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
Sense pin (to Cs1, electrode)
Sense pin (to Cs1)
Vss
SNS1A
SNS1B
SNS2A
SNS2B
Sense pin (to Cs2, electrode)
Sense pin (to Cs2)
Sense pin (to Cs2, electrode)
Sense pin (to Cs2)
Sense pin (to Cs3, electrode)
Sense pin (to Cs3)
10 SNS3B
11 SNS4A
12 SNS4B
10 SNS3A
11 SNS3B
12 SNS4A
13 SNS4B
Sense pin (to Cs3, electrode)
Sense pin (to Cs3)
Sense pin (to Cs4, electrode)
Sense pin (to Cs4)
Sense pin (to Cs4, electrode)
Sense pin (to Cs4)
13 NC/SNS5A Sense pin (to Cs5, electrode) n/c on QT140
14 Vss Supply negative rail (ground)
15 NC/SNS5B Sense pin (to Cs5) n/c on QT140
14 NC/SNS5A Sense pin (to Cs5, electrode) n/c on QT140
15 NC/SNS5B Sense pin (to Cs5) n/c on QT140
16 OC
Output Option (input pin; 1= open drain)
Adjacent Key Suppression Opt. (input; 1=AKS)
Channel 1 output, o-d or p-p
16 OC
Output Option (input pin; 1= open drain)
Adjacent Key Suppression Opt. (input ; 1=AKS)
Channel 1 output, o-d or p-p
17 AKS
18 OUT1
19 OUT2
20 OUT3
21 OUT4
17 AKS
18 OUT1
19 OUT2
20 OUT3
21 OUT4
Channel 2 output, o-d or p-p
Channel 2 output, o-d or p-p
Channel 3 output, o-d or p-p
Channel 3 output, o-d or p-p
Channel 4 output, o-d or p-p
Channel 4 output, o-d or p-p
22 NC/OUT5 Channel 5 output, o-d or p-p (n/c on QT140)
22 NC/OUT5 Channel 5 output, o-d or p-p (n/c on QT140)
23 SYNC
24 OPT1
25 OPT2
Synchronization pin (I/O pin - pull high with 10K)
Option Mode (Input pin - see Table 2-1)
Option Mode (Input pin - see Table 2-1)
23 SYNC
24 OPT1
25 OPT2
Synchronization pin (I/O pin - pull high with 10K)
Option Mode (Input pin - see Table 2-1)
Option Mode (Input pin - see Table 2-1)
26 OSC_O
27 OSC_I
Oscillator output
Oscillator input
26 OSC_O
27 OSC_I
Oscillator output
Oscillator input
28 /RST
Reset pin (active low input)
28 /RST
Reset pin (active low input)
The DIP and SOIC pinouts are not the same and serious
damage can occur if a part is miswired.
1 - OVERVIEW
QT140/150 devices are burst mode digital charge-transfer
(QT) sensor ICs designed specifically for touch controls; they
include all hardware and signal processing functions
necessary to provide stable sensing under a wide variety of
conditions. Only a single low cost capacitor per channel is
required for operation.
1.1 BASIC OPERATION
The 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. Internally, signals
are digitally processed to reject impulse noise using a
'consensus' filter that requires three consecutive
confirmations of detection. Each channel is measured in
sequence starting with Channel 1.
Figures 1-6 and 1-7 show basic circuits for these devices.
See Table 1-1 for device pin listings.
SSOP
DIP
Vss
Vss
Vdd
Vdd
/RST
Vdd
Vdd
/RST
The QT switches and charge measurement hardware
functions are all internal to the device. A single-slope
switched capacitor ADC includes the QT charge and transfer
switches in a configuration that provides direct ADC
conversion; an external Cs capacitor accumulates the charge
from sense-plate Cx, which is then measured.
OSC_I
OSC_I
OSC_O
OPT2
OPT1
SYNC
NC
Vss
Vss
OSC_O
OPT2
OPT1
SYNC
NC
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
SNS4A
Vss
SNS1A
SNS1B
SNS2A
SNS2B
SNS3A
SNS3B
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. Conversely, larger values
of Cs reduce the rise of differential voltage across it,
increasing available resolution by permitting longer QT
bursts. The value of Cs can thus be increased to allow larger
values of Cx to be tolerated. The IC is responsive to both Cx
and Cs, and changes in Cs can result in substantial changes
in sensor gain.
OUT4
OUT3
OUT4
OUT3
OUT2
OUT1
AKS
OC
OUT2
OUT1
AKS
OC
SNS4B
NC
SNS4A
SNS4B
NC
NC
NC
Vss
Fig 1-1 QT140 Pinouts
NOTE: SSOP / DIP Pinouts are not the same!
lQ
2
QT140/150 1.01/1102
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