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PDF ( 数据手册 , 数据表 ) QT60248

零件编号 QT60248
描述 (QT60168 / QT60248) 16 AND 24 KEY QMATRIX TOUCH SENSOR ICs
制造商 QUANTUM
LOGO QUANTUM LOGO 


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QT60248 数据手册, 描述, 功能
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lQ
QProx™ QT60168, QT60248
16, 24 KEY QMATRIX™ ICs
z Second generation charge-transfer QMatrix technology
z Keys individually adjustable for sensitivity, response
time, and many other critical parameters
z Panel thicknesses to 50mm through any dielectric
z 16 and 24 touch key versions
z 100% autocal for life - no adjustments required
z SPI slave interface
z Adjacent key suppression feature
z Synchronous noise suppression feature
z Spread-spectrum modulation - high noise immunity
z Mix and match key sizes & shapes in one panel
z Low overhead communications protocol
z FMEA compliant design features
z Negligible external component count
z Extremely low cost per key
z +3 to +5V single supply operation
z 32-pin lead-free TQFP package
X3
X4
VSS
VDD
VSS
VDD
X5
X6
132 31 30 29 28 27 26 2524
2 23
3 QT60248 22
4 QT60168 21
5 20
6 TQFP-32 19
7 18
8 17
9 10 11 12 13 14 15 16
Y1B
Y0B
n/c
VSS
VDD
SYNC
VDD
SCK
APPLICATIONS
y Security keypanels
y Industrial keyboards
y Appliance controls
y Outdoor keypads
y ATM machines
y Touch-screens
y Automotive panels
y Machine tools
These digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on up to 16 or 24 keys when used with a
scanned, passive X-Y matrix. They will project touch keys through almost any dielectric, e.g. glass, plastic, stone, ceramic, and even
wood, up to thicknesses of 5 cm or more. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material,
like copper or screened silver or carbon deposited on the rear of a control panel. Key sizes, shapes and placement are almost entirely
arbitrary; sizes and shapes of keys can be mixed within a single panel of keys and can vary by a factor of 20:1 in surface area. The
sensitivity of each key can be set individually via simple functions over the serial port by a host microcontroller. Key setups are stored
in an onboard eeprom and do not need to be reloaded with each powerup.
These devices are designed specifically for appliances, electronic kiosks, security panels, portable instruments, machine tools, or
similar products that are subject to environmental influences or even vandalism. They permit the construction of 100% sealed,
watertight control panels that are immune to humidity, temperature, dirt accumulation, or the physical deterioration of the panel surface
from abrasion, chemicals, or abuse. To this end they contain Quantum-pioneered adaptive auto self-calibration, drift compensation, and
digital filtering algorithms that make the sensing function robust and survivable.
These devices feature continuous FMEA self-test and reporting diagnostics, to allow their use in critical consumer appliance
applications, for example ovens and cooktops.
Common PCB materials or flex circuits can be used as the circuit substrate; the overlying panel can be made of any non-conducting
material. External circuitry consists of only a few passive parts. Control and data transfer is via an SPI port.
These devices makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in a matrix format that
minimizes the number of required scan lines. Unlike older methods, it does not require one IC per key.
TA
-400C to +1050C
-400C to +1050C
AVAILABLE OPTIONS
# Keys
Part Number
16 QT60168-ASG
24 QT60248-ASG
Lead-Free
Yes
Yes
LQ
Copyright © 2004 QRG Ltd
QT60248-AS R4.02/0405







QT60248 pdf, 数据表
2.17 Wiring
Table 2.2 - Pin Listing
Pin Function
1 X3
2 X4
3 Vss
4 Vdd
5 Vss
6 Vdd
7 X5
8 X6
9 X7
10 Vref
11 S_Sync
12 SMP
13 DRDY
14 /SS
15 MOSI
16 MISO
17 SCK
18 Vdd
19 SYNC
20 Vdd
21 Vss
22 NC
23 Y0B
24 Y1B
25 Y2B
26 Y0A
27 Y1A
28 Y2A
29 /RST
30 X0
31 X1
32 X2
I/O Comments
O X3 matrix drive line
O X4 matrix drive line
P Supply ground
P Power, +3 ~ +5V
P Supply ground
P Power, +3 ~ +5V
O X5 matrix drive line
O X6 matrix drive line
O X7 matrix drive line
I 0.05V nominal +/-10% via external divider
O Scope Sync: Synchronization test signal output
O Sample drive output
O
1= Comms ready;
has internal 20K ~ 50K pull-up
I
SPI slave select;
has internal 20K ~ 50K pull-up
I SPI data input
O SPI data output
I SPI clock input
P Power, +3 ~ +5V
I Mains sync input
P Power, +3 ~ +5V
P Supply ground
N/A Not used
I Y0B line connection
I Y1B line connection
I Y2B line connection
I Y0A line connection
I Y1A line connection
I Y2A line connection
I
Reset low;
has internal 30K ~ 80K pull-up
O X0 matrix drive line
O X1 matrix drive line
O X2 matrix drive line
If Unused, Connect To..
Leave open
Leave open
-
-
-
-
Leave open
Leave open
Leave open
-
Leave open
-
-
-
-
-
-
-
Vdd
-
-
Leave open
Leave open
Leave open
Leave open
Leave open or Vdd
Leave open
Leave open
Leave open
lQ
8 QT60248-AS R4.02/0405







QT60248 equivalent, schematic
Table 4.2 Command Summary
Hex Name
Description
0x00 Null command Used to get data back in SPI mode
#/Cmd # Rtnd
11
0x01
Enter Setups
mode
0x03 CAL all
0x04 Force reset
Enter Setups, stop sensing; followed by block
load of binary Setups of length ‘nn’. Command
must be repeated 2x consecutively without any
intervening command in 100ms to execute.
Sensing auto-restarts, however, the device
should be reset after the block load to ensure all
new setups will take effect.
2
+100
+1
Force device to recalibrate all keys; re-enters
RUN mode afterwards automatically; 0x03 must
be repeated 2x consecutively without any
intervening command in 100ms to execute
Force device to reset. Command must be
repeated 2x consecutively without any
intervening command in 100ms to execute
2
2
2
1
1
0x05 General status Get general part status.
12
0x06 Report 1st key Get indication of first touched key + others
12
0x07 Report all keys Sends back all key detect status bits (bitfield)
0x0B Error flags for all Error bit fields
0x0C FMEA status FMEA bitfield on X, Y lines
1
1
1
4
4
2
Rtn range
0..0xFF
0xFE
+ 0xFE
OR
0xFE
+ 0x00 (err)
0xFC
0xFB
0..0xFF
0..0xFF
0..0xFF
3 bytes
0..0xFF
3 bytes
0..0xFF
CRC
Notes
-
Flushes pending data from QT; one required to extract each response
byte.
First 0xFE issued when ready to get data, second 0xFE issued when
all loaded and burned; else timeout.
If 2 commands not received in 100ms, times out and no response is
issued. Part will timeout if each byte not received within 100ms of
-
previous byte.
If CRC failure, returns 0x00 instead of 0xFE
Data block length is 100 + 1 (added +1 byte is CRC-8). LSL should be
sent low byte first. A CRC of 0x00 is also acceptable in which
case the CRC is not checked.
The internal EEPROM will be programmed regardless of CRC health.
Returns 1’s complement of command to acknowledge cmd once the
-
cal has been initiated.
If 2 commands not received in 100ms, times out and no response is
issued.
Returns 1’s complement of command to acknowledge command prior
- to reset. If 2 commands not received in 100ms, times out and no
response is issued.
Bit 7: reserved
Bit 6: 1= comms error: unrecognized command received
This bit can be reset by the 0x0F cmmd
Bit 5: 1= FMEA failure
Bit 4: 1= Reserved
Yes Bit 3: 1= line sync failure
Bit 2: 1= cal failed 5 times on an enabled key, or, an enabled key has
a low reference (Ref < LSL)
Bit 1: 1= any key in calibration
Bit 0: 1= any key is in detect
2nd return byte is CRC-8 of cmmd + return data
Bit 7: 1= indicates 2 or more touches if set.
Bit 6: 1= any of the following conditions prevail: calibrating, key(s)
failed cal 5 times, sync fail, comms error, FMEA failure.
Yes Bit 5: Unused
Bits 4..0: indicates key number (0..23) of first key touched; reads
0x1F (31 decimal) if no touch.
2nd return byte is CRC-8 of cmmd + return data
Yes 4th return byte is CRC-8 of cmmd + return data
Yes 4th return byte is CRC-8 of cmmd + return data
Yes 2nd return byte is CRC-8 of cmmd + return data
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16 QT60248-AS R4.02/0405










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