MK712S [ICSI]
Touch Screen Controller; 触摸屏控制器
| 型号： | MK712S |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Touch Screen Controller |
| 文件： | 总16页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK712
Touch Screen Controller
ICR O CLOC K
Description
Features
The MK712 Touch Screen Controller IC provides
all the screen drive, A to D converter and control
circuits to easily interface to 4-wire analog resistive
touch screens.
• Fully integrated, lowest power solution
• Low standby current of 0.5µA (typical) at 5.0V
• Active current while converting less than 10 mA
• Resolves 350 dots/inch on 10.5” display
• Maximum speed of 197 points/second
• Ratiometric conversion may eliminate screen
calibration
• Automatically wakes up and goes back to standby
• 3.3V or 5V supply
• 12 bit A/D converter
• Simplifies the writing of software for touch screens
• Extended temperature range available
• Capacitors are the only external components
required
• Touch screen is directly driven - no external
transistors are required
The IC continually monitors the screen waiting
for a touch. In this mode, the supply current is
typically 0.5µA. When the screen is touched, the
IC performs analog to digital conversions to
determine the location of the touch, stores the X
and Y locations in the registers, and issues an
interrupt. This process is repeated up to 197 times
per second until no further screen touches are
detected, at which time the low current mode is
resumed.
Block Diagram
• Programmable conversion rate
• A to D Converter is monotonic
• Parallel interface
• See the MK715 for a serial interface
REGISTERS
STATUS LOW
8
0
D0-D7
A0-A2
1
2
3
STATUS HIGH
X-LOW
Pin Assignment
3
X-HIGH
4
5
6
Y-LOW
Y-HIGH
CONTROL
RATE
28
27
26
25
24
23
22
21
20
19
18
17
16
15
NC
INT
TOUCH
VDD
1
2
3
4
5
6
7
8
D0
D1
D2
D3
D4
D5
VDD
GND
D6
D7
CLKIN
A0
A1
A2
CS
RD
WR
7
VDD
XH
XL
YH
YL
GND
GND
WR
9
10
11
12
13
14
CLKIN
XH
12 Bit A/D,
Screen Driver
and
(14.318 MHz)
XL
YH
YL
RD
CS
INT
Controller
TOUCH
MDS 712 I
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Revision 100899 Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race St.•San Jose•CA•95126•(408)295-9800tel•www.icst.com
MK712
Touch Screen Controller
ICR O CLOC K
Pin Descriptions
Number
1
Name
NC
Type Description
-
O
No Connect
2
INT
TOUCH
VDD
VDD
XH
Interrupt. Goes high to signal an interrupt. Cleared on next read.
3
O
Touch signal. Goes low when screen is touched. Goes high when not touched.
4
P
Connect to +5V or +3.3V.*
5
P
Connect to +5V or +3.3V.*
6
TS
TS
TS
TS
P
Connect to X-high on touch screen. (Right side)
7
XL
Connect to X-low on touch screen. (Left side)
8
YH
Connect to Y-high on touch screen. (Top)
9
YL
Connect to Y-low on touch screen. (Bottom)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
GND
GND
WR
RD
Connect to ground.
P
Connect to ground.
I
Write enable. Active low.
I
Read enable. Active low.
CS
I
Chip select. Active low.
A2
I
Register address 2.
A1
I
Register address 1.
A0
I
Register address 0.
CLKIN
D7
I
Clock input. Typically 14.3 MHz. Best if driven by a MicroClock clock synthesizer.
I/O
I/O
P
Data bit 7.
D6
Data bit 6.
GND
VDD
D5
Connect to ground.
Connect to +5V or +3.3V.*
Data bit 5.
P
I/O
I/O
I/O
I/O
I/O
I/O
D4
Data bit 4.
D3
Data bit 3.
D2
Data bit 2.
D1
Data bit 1.
D0
Data bit 0.
Key: I = Input, O = Output, I/O = Input and Output, P = Power, TS = Touch Screen pin..
*Note: All VDD’s must be connected to the same voltage.
Interrupts
Interrupts are controlled by register 6 (see Register Description). The INT pin (pin 2) goes high to
signal an interrupt. Interrupts are then cleared by reading any register. However, if the MK712 is in the
process of generating an interrupt during a read cycle, then the interrupt is not cleared and INT will stay
high. This internal process may take 100ns, and so to guarantee that the interrupt is cleared, two
successive read cycles may be necessary.
MDS 712 I
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Revision 100899 Printed 11/16/00
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MK712
Touch Screen Controller
ICR O CLOC K
IC Operation
(Periodic Conversions Enabled)
Power ON
Is
Screen
Touched?
N
Y
Write D4, D5 Reg 0 And
D2, D3 Reg 1 To 1
Issue Interrupt
(If Enabled)
Convert
Y Co-Ordinates
Store Y Co-Ordinates In
Reg 4 and Reg 5
Convert
X Co-Ordinates
Store X Co-Ordinates in
Reg 2 and Reg 3
Write D7 Reg 0 To 1
Issue Interrupt
(If Enabled)
Is
Screen
Touched?
Y
N
Write D4, D5 Reg 0 And
D2, D3 Reg 1 To 0
Issue Interrupt
(if Enabled)
MDS 712 I
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Revision 100899 Printed 11/16/00
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MK712
Touch Screen Controller
ICR O CLOC K
Register Description
The MK712 register set is designed to be compatible with the Gazelle pen digitizer registers allowing a
software driver for the Gazelle digitizer to be used with the MicroClock MK712. The eight 8-bit registers
are defined below:
STATUS LOW (0 READ)
Y-HIGH (5 READ)
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Always zero
1 = touch
High order bits of Y co-ordinate
Always zero
Always zero
1 = conversion complete,
cleared on Y-HIGH read
CONTROL (6 R/W)
7
6
5
4
3
2
1
0
NOTE: When the screen is touched bits 4 and 5,
register 0, and bits 2 and 3 of register 1 are all set to one.
1 = enable interrupts
1 = interrupt on conversion
complete ( if bit 0 = 1)
STATUS HIGH (1 READ)
1 = interrupt on change in
touch status (if bit 0 = 1)
7
6
5
4
3
2
1
0
Always zero
1 = touch
1 = interrupt on change in
touch status (if bit 0 = 1)
Always zero
1 = enable periodic conversions at
rate indicated by RATE register
1 = read one point. Cleared when
conversion complete. Only functions
when bit 4 = 0
X-LOW (2 READ)
0 = powerdown (PD). Conversions,
interrupts and TOUCH output disabled
7
6
5
4
3
2
1
0
Low order bits of X co-ordinate
1 = powerdown (PD). Conversions,
interrupts and TOUCH output
disabled.
NOTE: Bits 2 or 3 and bits 6 or 7 are logically OR’d. For
example writing bit 2 or bit 3 to a one will enable interrupts
on change in touch status.
X-HIGH (3 READ)
7
6
5
4
3
2
1
0
High order bits of X co-ordinate
Always zero
RATE (7 R/W)
7
6
5
4
3
2
1
0
Count controls frequency of
conversion when periodic
conversions are enabled. See
table on page 5.
Y-LOW (4 READ)
7
6
5
4
3
2
1
0
Low order bits of Y co-ordinate
MDS 712 I
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Revision 100899 Printed 11/16/00
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MK712
Touch Screen Controller
ICR O CLOC K
Rate Register (Register 7) Programming
Count
0 to 8
9
P.P.S.
Count
28
29
30
31
32
33
34
35
40
45
50
55
60
65
70
75
80
85
90
95
P.P.S.
95
93
90
88
86
84
82
80
72
65
60
55
51
47
44
42
39
37
35
34
Count
100
105
110
115
120
125
130
135
140
145
150
155
165
175
185
195
205
225
235
255
P.P.S.
32
31
29
28
27
26
25
24
24
23
22
21
20
19
18
17
16
15
14
13
Not Permitted
197
10
187
11
177
12
169
13
161
14
154
15
147
16
141
17
136
18
131
19
126
20
122
21
118
22
114
23
110
24
107
25
104
26
101
27
98
P.P.S. = Points Per Second. With a 14.318 MHz clock.
Calculating Points Per Second
The formula for determining P.P.S. is:
P.P.S. =
fin
35716 + (4096 x COUNT)
Where fin is the frequency
of the CLKIN input.
Power-On Reset
On application of power, an internal reset is generated that clears all bits in registers 0, 1, and 6. Register 7 is
set to 32 giving a rate of 86 PPS. Note that clearing register 6 puts the IC into the power down condition.
Initializing the MK712
The interrupt on the MK712 can only be cleared by reading a register or by writing register 6 to the
power down condition. After a fault condition, initialize the MK712 by writing register 6 to zero and
then writing register 6 to the desired value. This will always clear pending interrupts.
MDS 712 I
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Revision 100899 Printed 11/16/00
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MK712
Touch Screen Controller
ICR O CLOC K
Recommended Circuit
To Power Management
To Interrupt Controller
RD
TOUCH
INT
CS
From
Microprocessor
WR
A0 - A2
D0 - D7
X HIGH
To
XH
XL
CLKIN
14.318 MHz
+3.3V or +5V
X LOW
Touch
VDD
VDD
VDD
Screen
Y HIGH
YH
YL
Y LOW
0.1µF 0.1µF
22µF
GND
GND
0.01µF 0.01µF 0.1µF 0.1µF
GND
Pen Bounce
When the screen is untouched, the Y plate is driven high and the X plate is driven low. When the screen is
touched, the X plate is pulled high, which is detected by the MK712. This initiates a conversion (as long as
periodic conversions are enabled). Some de-bounce is provided by the time constant of the screen
decoupling capacitors combined with the screen resistance. However, once conversions have started, pen
bounce will not be detected until after both the X and Y points have been taken.
If the pen is lifted during a conversion, this will also not be detected until the conversion is complete. This is
typically indicated by a point with the correct Y coordinates, but minimum (for that screen) X coordinates.
Screen Decoupling
The component values suggested should give excellent results. However, for screens with a high
resistance operating at a high conversion rate, extra interrupts may be issued. This is because the time
constant of the screen decoupling capacitors and screen resistance is high, resulting in the screen
appearing to be untouched and then touched between conversions. These extra interrupts can be
eliminated by reducing the size of the screen decoupling capacitors on pins XH, XL, YH, and YL.
This will, however, slightly reduce the noise rejection, which could decrease the accuracy of the
conversion.
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Optimizing Performance when Reading and Writing Registers
Reading and writing the MK712 generates digital noise that may reduce the accuracy of the A to D
converter. This noise has several causes, including board layout, data bus loading, and power supply
voltage. By appropriately timing the register operations, the effects of this noise can be minimized.
After an interrupt is issued, the MK712 allows a minimum of 1 millisecond to elapse before
initiating the conversion cycle. This allows the screen drivers to settle. For best performance,
complete all register operations within this 1ms window after an interrupt.
Power Down/Stopping the Clock
If the screen is untouched, the supply current is under 3µA. If the input clock is stopped, the supply
current is also less than 3µA. When the screen is touched with no clock, TOUCH goes low and INT
goes high, but no further operations occur until the clock starts. A to D conversions are invalid until
after the clock has stabilized at the correct frequency and one full conversion cycle has been
completed.
Input Clock
The MK712 is highly tolerant of different clock frequencies (from 12 to 20 MHz), rise times, and
duty cycles. However, any input clock undershoot or overshoot will cause the MK712 to draw extra
current. This can be eliminated by using a MicroClock clock synthesizer and properly terminating
the clock driver. MicroClock makes low power clock synthesizers with 14.3 MHz power down.
Resistive Touch Screen (4 Wire)
Resistive touch screens consist of 2 resistive plates that are separated by a small gap. Each plate has an
electrode at each end and when the screen is touched, the two plates are shorted together at that point.
YH
Y PLATE
X PLATE
Electrode
XL
XH
YL
If a voltage is applied, for example, between XL and XH, then a voltage divider is formed on the X
PLATE. When the Y PLATE is touched to the X PLATE, a voltage will be developed on the Y PLATE
that is proportional to distance of the touch from XL and XH. By accurately measuring this voltage, the
position of the touch can be determined.
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Recommended Method for Reading Points
If the user is pressing lightly on the touch screen, it is likely that the screen contact will be intermittent.
The screen will bounce, causing false points. This effect can be reduced by insuring that the screen is
touched both before and after a conversion. By doing this, the first and last point in a series of points
are discarded. The following algorithm checks that a point has valid touches both before and after a
conversion, and it distinguishes between change-in-touch interrupts and conversion complete
interrupts. Register 6 bits 0, 1, and 2 must all be true (logical 1) in order to use this method.
Start
Wait for Interrupt
Interrupt
Read Register 0 D7D5, store as D7D5(n)
Read X and Y, store as point n
Increment
n
No
Is D7D5(n-1) = 11b
and D7D5(n) =11b?
Are this point and the previous point valid?
(11b = binary 11)
Yes
Write previous point.
Write point n-1 to display
Warning - When Using a Switching Regulator Power Supply
When using the MK712 in a system where the power is supplied by a switching regulator, do not
perform screen conversions when the regulator is operating in the power saving mode. Some switching
regulators feature a low power mode (for example, Linear Technology’s “Burst Mode”) where the
output is turned on and off in order to save power. The extra power supply noise generated when using
this mode causes spurious data points to be returned from the MK712, so it should be disabled when
the MK712 is doing screen conversions.
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Analog to Digital Converter Operation
The 12-bit ADC converts X and Y co-ordinates at a rate determined by registers 6 and 7. The
converter uses a ratiometric technique to give absolute co-ordinates on the screen, largely independent
of variations in screen resistance, temperature or power supply voltage. The total voltage applied across
the screen is defined as full-scale for the converter (i.e. 4095) and any point touched on the screen is
proportional to this. For example, if the screen is touched exactly in the center, the converter will read
2047. This feature may allow for the elimination of calibration upon startup.
However, the full scale voltage is defined at the IC pins and so any parasitic interconnect resistance will
be included in full scale. In addition, the interconnect resistances on the screen also account for about
20% of the total resistance. This means that approximately the bottom 10% and top 10% of full scale
are inaccessible.
The converter is guaranteed to be monotonic, with no missing codes.
BOARD AND WIRE
INTERCONNECT
XH
SCREEN
INTERCONNECT
FULL
SCALE
(4095)
MK712
YL
SCREEN
X
CO-ORDINATE
SCREEN
INTERCONNECT
XL
BOARD AND WIRE
INTERCONNECT
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Referenced to GND
Max of 20 seconds
-0.5
0
°C
°C
°C
260
Storage temperature
-65
150
DC CHARACTERISTICS
Operating Voltage, VDD
3.0
2.0
5.5
0.8
V
V
Input High Voltage, VIH
Input Low Voltage, VIL
VDD=5V
VDD=5V
V
Output High Voltage, VOH
Output High Voltage, VOH
Output Low Voltage, VOL
Input High Voltage, VIH
Input Low Voltage, VIL
IOH=-2mA
VDD-0.4
2.4
V
VDD=5V, IOH=-12mA
VDD=5V, IOL=12mA
VDD=3.3V
V
0.4
0.4
0.4
V
1.9
2.4
V
VDD=3.3V
V
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, at VDD=5V
VDD=3.3V, IOH=-6mA
VDD=3.3V, IOL=6mA
300 W screen, 100 PPS
V
V
5
3
mA
mA
µA
µA
µA
mA
pF
Operating Supply Current, IDD, at VDD=3.3V note 4
Operating Supply Current, IDD standby, clock
Operating Supply Current, IDD standby
Operating Supply Current, IDD power down
Short Circuit Current
note 5
0.5
0.5
0.2
±50
7
3
3
3
note 6
PD=0 or PD=1, no clock
Each output
Input Capacitance
AC CHARACTERISTICS
Input Clock Frequency, pin 18
Input Clock Duty Cycle, pin 18
Output Rise Time
Note 2
12
25
14.32
20
75
3
MH z
%
at 1.5V
0.8 to 2.0V, VDD=5V
2.0 to 0.8V, VDD=5V
ns
Output Fall Time
3
ns
Resolution
12
±2
2000
bits
LSB
W
Non-linearity
Monotonic, note 3
Touch Screen Resistance
100
Notes: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
2. Consult MicroClock about the best device to use to generate the input clock.
3. With no missing codes.
4. Assumes no 14.3MHz input clock overshoot, 300 W screen, 100 PPS
5. Assumes no 14.3MHz input clock overshoot, no touch
6. With no touch, no clock
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Register Interface Timing
#
Symbol
Description
Min
Max
Unit
Note
READ AND WRITE CYCLES
1
2
3
TRASC
TRAHC
TRCCY
Address Setup to CS Low
5
0
ns
ns
ns
Address Hold from CS High
CS High to CS Low
40
READ CYCLE ONLY
4
5
6
7
8
9
TRSCR
TRRD
CS Low to RD Low
RD Pulse Width
10
40
0
ns
ns
ns
ns
ns
ns
ns
ns
TRCHR1
TRCHR2
TRDC
RD High to CS High
RD High to CS Low
CS Low to Data
40
35
35
20
20
TRDR
RD Low to Data
10 TRDHC
11 TRDHR
CS High to Data Release
RD High to Data Release
2
2
1
1
WRITE CYCLE ONLY
12 TRCSW
13 TRWR
CS Low to WR Low
10
40
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
WR Pulse Width
14 TRCHW
15 TRWH
WR High to CS High
WR High to CS Low
WR High to WR Low
Data Setup to WR High
Data Hold from WR High
Data Setup to CS High
Data Hold from CS High
2
40
40
15
15
15
15
16 TRWCY
17 TRDW
3
4
3
4
18 TRDHW
19 TRDWC
20 TRDHWC
Notes: 1. RD edges may precede or follow CS edges.
2. WR edges may precede or follow CS edges.
3. Either TRDW or TRDWC specification must be met.
4. Either TRDHW or TRDHWC specification must be met.
5. It is not permitted to have both RD and WR low at the same time.
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Register Read
A0 - A2
CS
1
2
3
RD
4
6
5
7
10
9
D0 - D7
8
11
Register Write
A0 - A2
CS
1
2
3
WR
12
13
14
15
16
D0 - D7
17
18
20
19
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
1 2
1 0
8
MK712 Power Supply Current vs. Touchscreen Resistance
VDD=3.3V
IDD
(mA)
6
4
1 9 7 point s per second
1 4 7 point s per second
8 6 point s per second
1 3 point s per second
2
0
1 0 0
1 0 0 0
1 0 0 0 0
Touchscreen Resistance (W)
Graph 1
1 8
1 6
1 4
1 2
1 0
8
MK712 Power Supply Current vs. Touchscreen Resistance
VDD=5V
IDD
(mA)
6
4
1 9 7 point s per second
1 4 7 point s per second
8 6 point s per second
1 3 point s per second
2
0
1 0 0
1 0 0 0
1 0 0 0 0
Touchscreen Resistance (W)
Graph 2
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
MK712 Power Supply Current vs. Conversion Rate
9
8
7
6
5
4
3
2
Screen Resistance = 320W
VDD=5V
IDD
(mA)
VDD=3.3V
1
0
0
5 0
1 0 0
1 5 0
2 0 0
Conversion Rate (Points Per Second)
Graph 3
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
Suggested Layout
22µF
Pin 1
28
2
3
4
5
27
26
25
24
23
22
21
20
19
18
17
16
15
G
V
0.01µF
0.1µF
0.1µF
6
7
To
V
Touch
Screen
G
8
9
0.1µF
0.01µF
10
11
12
13
14
0.1µF
G
G = connection to ground plane
= connection to VDD plane
V
Notes:
1. The 14.318 MHz input clock on pin 18 should have a 33Wseries termination resistor at its source.
Consult MicroClock for the best way to generate this clock.
2. All digital signals should be kept well away from pins 4, 5, 6, 7, 8, 9, 10, and 11, and any traces
connected to those pins.
MDS 712 I
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MK712
Touch Screen Controller
ICR O CLOC K
28 pin SOIC wide
Inches
Symbol Min Max
0.092 0.104 2.3368 2.6416
Millimeters
Package Outline and Package Dimensions
Min Max
A
b
0.014 0.019 0.356
0.009 0.012 0.229
0.483
0.305
c
D
E
H
e
0.696 0.712 17.678 18.085
0.290 0.300 7.366 7.620
0.394 0.419 10.008 10.643
.050 BSC 1.27 BSC
0.016
0.003 0.011 0.076
E
H
h
0.406
0.279
Q
28 pin SSOP (QSOP)
h x 45°
Millimeters
D
Symbol Min
Max
1.73
A
b
1.55
A
0.203 0.305
0.190 0.254
9.780 10.160
3.810 4.064
5.840 6.223
0.635 BSC
c
Q
c
b
e
D
E
H
e
h
0.410
Q
0.127 0.254
Ordering Information
Part/Order Number
Marking
Package
Temperature
0 to +70°C
MK712S
MK712STR
MK712SI
MK712S
MK712S
MK712SI
28 pin SOIC
Add tape and reel 0 to +70°C
28 pin SOIC -30 to +70°C
Add tape and reel -30 to +70°C
28 pin SSOP 0 to +70°C
Add tape and reel 0 to +70°C
28 pin SSOP -30 to +70°C
Add tape and reel -30 to +70°C
MK712SITR
MK712R
MK712RTR
MK712RI
MK712SI
MK712R
MK712R
MK712RI
MK712RI
MK712RITR
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its
use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is
intended for use in normal commercial applications. Any other applications such as those requiring special processing, high reliability, or other extraordinary environmental
requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or
warrant any ICS product for use in life support devices or critical medical instruments.
©1995 ICS/MicroClock
MDS 712 I
16
Revision 100899 Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race St.•San Jose•CA•95126•(408)295-9800tel•www.icst.com
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