Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF Download HTML

QT1101 Datasheet(PDF) 7 Page - Quantum Research Group

Part # QT1101
Description  10 KEY QTOUCH SENSOR IC
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  QUANTUM [Quantum Research Group]
Direct Link  http://www.qprox.com
Logo QUANTUM - Quantum Research Group

QT1101 Datasheet(HTML) 7 Page - Quantum Research Group

Back Button QT1101 Datasheet HTML 3Page - Quantum Research Group QT1101 Datasheet HTML 4Page - Quantum Research Group QT1101 Datasheet HTML 5Page - Quantum Research Group QT1101 Datasheet HTML 6Page - Quantum Research Group QT1101 Datasheet HTML 7Page - Quantum Research Group QT1101 Datasheet HTML 8Page - Quantum Research Group QT1101 Datasheet HTML 9Page - Quantum Research Group QT1101 Datasheet HTML 10Page - Quantum Research Group QT1101 Datasheet HTML 11Page - Quantum Research Group Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
2.8 Fast Detect Mode
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 15 ms 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 360ms typical 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 another LP pulse is received.
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 non-detection to turn a key off.
Fast Detect mode can be enabled as shown in Tables 1.2
and 1.6.
2.9 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 labeled SMR between pins SNS6K and
SNS7. (see Figure 1.2).
In this mode there is only one option available - 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:
DETECT Pin: Push-pull, active high
SYNC/LP Function: LP mode, ~200ms response time
Max On-Duration: 60 seconds
See also Tables 1.6 and 1.7.
2.10 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 2.6).
2.11 Serial 1W Interface
The 1W serial interface is an RS-232 based auto baud rate
serial asynchronous interface that requires only one wire
between the host MCU and the QT1101. The serial data are
extremely short and simple to interpret.
Auto baud rate detection takes place by having the host
device send a specific character to the QT 1101, which
allows the QT1101 to set its baud rate to match that of the
One feature of this method is that the baud rate can be any
rate between 8,000 and 38,400 bits per second. Neither the
QT1101 nor the host device has to be accurate in their
transmission rates, i.e. crystal control is not required.
Depending on the timing of a 1W host transmission, the
QT1101 device may need to abort an acquisition burst, and
rerun it after the transmission is complete and a reply has
been sent. As a consequence, each host request can
potentially result in a small, unnoticeable increase in
detection delay.
1W Connection: The 1W pin should be pulled high with a
resistor. When not in use it floats high, hence this causes no
increase in supply current.
During transmission from the host, the host may drive the
1W line with either an open-drain or a push-pull driver.
However, if the host uses push-pull driving, it must release
the 1W line as soon as it is done with its stop bit so that
there is no drive conflict when the QT1101 sends its reply.
If open-drain transmission is used by the host, the value of
the pull-up resistor should be optimized for the desired baud
rate: faster rates require a lower value of resistor to prevent
rise-time problems. A typical value for 19,200 baud might be
✡. An oscilloscope should be used to confirm that the
resistor is not causing excessive timing skew that might
cause bit errors.
The QT1101 uses push-pull drive to transmit
data out on the 1W line back to the host. When
the stop bit level is established, 1W is floated;
for this reason, a pull-up resistor should always
be used on the 1W pin to prevent the signal from
drifting to an undefined state. A 100K
✡ pull-up
resistor on 1W is recommended, unless the host
uses open-drain drive to the QT1101, in which
case a lower value may be required (see prior
2.11.1 Basic 1W Operation
The basic sequence of 1W serial operation is
shown in Figure 2.1. The 1W line is bi-directional
and must be pulled high with a resistor to
prevent a floating, undefined state (see previous
QT1101 R4.06/0806
Figure 2.1 Basic 1W Sequence
*See Figure 2.3
Figure 2.2 1W UART Host Pattern
1 ~ 3 bit periods
key state
from host
(1 byte)
driven reply
from QT1101
(2 bytes)*
S 0 1234
7 S
Serial bits
(from host)

Similar Part No. - QT1101

ManufacturerPart #DatasheetDescription
Quantum Research Group
Quantum Research Group
QT110 QUANTUM-QT110 Datasheet
385Kb / 12P
QT110-DG QUANTUM-QT110-DG Datasheet
381Kb / 12P
QT110-G QUANTUM-QT110-G Datasheet
381Kb / 12P
QT110-IG QUANTUM-QT110-IG Datasheet
381Kb / 12P
QT110-ISG QUANTUM-QT110-ISG Datasheet
381Kb / 12P
More results

Similar Description - QT1101

ManufacturerPart #DatasheetDescription
Quantum Research Group
Quantum Research Group
QT1100A QUANTUM-QT1100A Datasheet
561Kb / 42P
QT1103 QUANTUM-QT1103 Datasheet
287Kb / 22P
277Kb / 12P
QT240 QUANTUM-QT240 Datasheet
258Kb / 12P
QT220 QUANTUM-QT220 Datasheet
326Kb / 12P
QT1080 QUANTUM-QT1080 Datasheet
205Kb / 16P
QT1081 QUANTUM-QT1081 Datasheet
246Kb / 20P
ATMEL Corporation
ATMEL Corporation
AT42QT1111-MU ATMEL-AT42QT1111-MU Datasheet
713Kb / 50P
   QTouch 11-key Sensor IC
AT42QT1110-MZ ATMEL-AT42QT1110-MZ_14 Datasheet
668Kb / 50P
   11-key QTouch Touch Sensor IC
AT42QT1040 ATMEL-AT42QT1040 Datasheet
323Kb / 18P
   QTouch??4-key Sensor IC
More results

Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 

Datasheet Download

Go To PDF Page

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com  |   allmanual.com