MK715 [ICSI]
Touch Screen Controller; 触摸屏控制器
| 型号： | MK715 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Touch Screen Controller |
| 文件： | 总22页 (文件大小：376K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK715
Touch Screen Controller
General Description
Features
Tiny 20 pin SSOP (150 mil body)
4 microamp standby current
The MK715 Touch Screen Controller IC provides all the
screen drive, Analog to Digital converter (ADC) and
controlcircuitstoeasilyinterfaceto4-wireanalogresistive
touch screens. It also includes a general purpose A to D
converter and a clock synthesizer.
Less than 3mA active current at 3.3V, including
screendrive
Touch pressure can be measured
One or two general purpose A to D inputs
On-chipvoltagereference
32.768kHz crystal/clock input
MHz clock outputs available
Operates with four wire touch screens
Ratiometric conversion eliminates screen
calibration
Automatic wake up upon screen touch
Programmable conversion rate to a maximum of
303 points per second
The IC continually monitors the screen waiting for a
touch. In this mode, the supply current is typically 4µA.
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 303 times per
second until no further screen touches are detected, at
which time the low current mode is resumed.
The device has a general purpose input into the 10-bit
ADC, allowing for the measurement of other inputs such
as battery voltage. The MK715 can be powered from a
3.3V supply, and uses an inexpensive 32.768kHz watch
crystal as the input reference. An internal Phase-Lock
Loop clock synthesizer provides the high speed clock for
the ADC, and the option to have a clock output to drive
other digital chips in the system.
3.3V or 5V supply (2.7V version available)
10 bit A/D converter
Full powerdown control
Touch screen is directly driven - no external
transistors are required
A to D Converter guaranteed monotonic
3 or 4 wire serial interface
The tiny package is the same body size as the 14 pin
SOIC, with 25 mil spacings on the leads.
Pin Assignment
Applications
CS
SK
D0
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
Notebook Computers
Handheld Computers
PDAs
CLKOUT
INT
DI
VDD
X2
TOUCH#
XH
Touch-screen kiosks
X1
XL
GND
CAP2
CAP1
CAP3
YH
YL
PL
GP
MK715
20 pin SSOP
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all device
data to verify that any information being relied upon by the customer is current and accurate.
MK715RevD020200
MK715
Pin Descriptions
Pin#
1
Name
SK
Type
Description
Serial Clock.
I
O
I
2
DO
Data Out. For 3 wire serial port, connect to pin 3.
Data In. For 3 wire serial port, connect to pin 2.
Touch Signal. Goes low when screen is touched. Optional Clock out.
Connect to X - high on touch screen (right side).
Connect to X - low on touch screen (left side).
Connect to Y - high on touch screen (top).
Connect to Y - low on touch screen (bottom).
General purpose ADC input.
3
DI
4
TOUCH#
XH
O
TS
TS
TS
TS
I
5
6
XL
7
YH
8
YL
9
PL
10
11
12
13
14
15
16
17
18
19
20
GP
I
General purpose ADC input.
CAP3
CAP1
CAP2
GND
X1
-
Connect a 0.01uF capacitor to ground.
Loop filter connection.
-
-
Loop filter connection.
P
I
Connect to ground.
Connect to 32.768 kHz crystal, or ground for clock input.
Connect to 32.768 kHz crystal or clock input.
Connect to +5 V or +3.3 V.
X2
I
VDD
INT
P
O
O
I
Interrupt. Goes high to signal interrupt. Optional clock output.
Clock output. Typically 32.768 kHz. Can also be MHz output.
Chip select Active high.
CLKOUT
CS
Key: I=Input, O=Output, I/O=InputandOutput, P=Power,TS=TouchScreenpin.
2
MK715
Chip Overview
The MK715 communicates via a 4 pin serial port. This may be connected as either a 3 or 4 wire
serial port. The port is connected to 4 registers that control the various modes and function of the
chip.
The primary function of the MK715 is to control resistive touchscreens. There are two ways to read
screenpoints, bothcontrolledbytheregisters.
In the first method, which is enabled by setting the ENCONR bit, the MK715 performs periodic
conversions at a rate set by the rate register. The chip monitors the touch screen in a low power
condition (about 4 mA) until the screen is touched. When a touch is detected, the chip powers up
and starts converting screen points. The TOUCH# pin goes low and INT goes high to indicate a
change in touch status. The converter outputs a Y co-ordinate, then an X co-ordinate, then a Y co-
ordinate, and so on. The X and Y co-ordinates are stored in the same register (RESULT) and each
conversion over-writes the previous conversion. When a co-ordinate is stored, the conversion
complete bit is asserted in the STATUS register. This bit is cleared when the RESULT register is
read. The inverted state of the TOUCH# pin also appears in the STATUS register. After each co-
ordinate conversion, INT goes high and the screen is checked to see if it is still touched. If not,
conversions stop, TOUCH# goes high, INT goes high (to indicate a change in touch status) and
the chip reverts to the low power mode.
The second method to read a screen is to set the RD1PT (read one point) bit in the CONTROL
register. The chip will perform two conversions, a Y co-ordinate followed by an X co-ordinate. The
X co-ordinate overwrites the Y co-ordinate and so the X co-ordinate must be read before this
happens. Finally, RD1PT is cleared. The conversion pair takes about 3.5 ms.
The converter may also be used to measure voltages presented on the GP or PL pins. The range
of the converter is 0 to 1.279 V and so voltages outside this range must be scaled appropriately.
Again, the RD1PT bit is set to start the conversion but first either SELGP or SELPL must be set
to select the correct input. Only one conversion is performed. The result is stored in the RESULT
register and then RD1PT is cleared. The conversion takes about 1.7ms.
The final conversion mode is used to measure touch pressure. This is controlled identically to the
second method outlined above except that either RDPRESA or RDPRESB must first be set.
The MK715 allows for several different clocks to be generated, controlled by the registers. On the
CLKOUTpin, theoutputiseitheraa32768HzclockfromthecrystaloscillatororaMHz-frequency
clock synthesized from the PLL. Similarly, this MHz - frequency clock can appear on the INT or
TOUCH# pins instead of their usual functions. In these cases, if the MHz clock needs to run
continuously,thentheENPLLbitmustbeset inordertooverridetheautomaticpowerdownofthePLL.
Refer to page 12 for more details.
3
MK715
Block Diagram
Registers
Status
Rate
Result
Control
0
1
2
3
DI
D0
12
Serial
Port
CS
SK
XH
XL
YH
YL
PL
Screen
Drive
Controller
CAP3
10 Bit A-D
Converter
Voltage
Reference
1
0
INT
GP
CAP1
1
0
TOUCH#
CLKOUT
Phase
Locked
Loop
CAP2
X1
32.768kHz
Oscillator
1
0
X2
4
MK715
IC Operation
(Periodic Conversions Enabled)
Power ON
N
Is screen
touched?
Y
Write D6 Reg 0 to 1 and TOUCH# = 0
Issue Interrupt, power-up ADC and PLL
Convert Y co-ordinates
Store Y co-ordinates in Register 2
Write D7 register 0 to 1
Issue interrupt
N
Is screen
touched?
Y
Convert X co-ordinates
Store X co-ordinates in Register 2
Write D7 register 0 to 1
Issue Interrupt
Wait. Duration controlled by Rate Register
Y
Is screen
touched?
N
Write D6 Reg 0 to 0 and TOUCH# = 1
Issue Interrupt, power-down ADC and PLL
5
MK715
Register Description
The MK715 has four 12 bit registers. However, only 8 bits in each register can be written (D0-D7). The other 4 bits (D8-
D11)canneverbewrittenandarealwaysreadonly.TheRESULTregistercontains2levels, areadonlylevelandawrite
only level. Reading this register gives the conversion results. Writing this register changes 4 control bits.
DESCRIPTION
Read
and
STATUS (ADDRESS 0)
Power-up
State
11 10 9 8 7 6 5 4 3 2 1 0
TYPE
R/W
R/W
R/W
R/W
Write
RD1PT. Read one point. Cleared when
conversion complete.
ENCONR.Enableperiodicscreenconversions
at rate set by RATE register.
PD. Power Down. Chip powers down. See
CONTROL register bit 7.
ENPLL. Overrides automatic powerdown of
PLL between conversions and forces
continuous running.
0
0
0
0
SELGP. Select GP input to ADC.
SELPL. Select PL input to ADC.
Touch Status. 1 = touch.
Conversion complete. Cleared on next read
of RESULT register.
R/W
R/W
RO
0
0
0
0
RO
Always set to zero.
RO
0
RATE(ADDRESS1)
Read
and
Write
11 10 9 8 7 6 5 4 3 2 1 0
Controls frequency of screen conversions
when periodic conversions are enabled.
Always set to zero.
R/W
RO
32
0
RESULT (ADDRESS 2)
Read
Write
11 10 9 8 7 6 5 4 3 2 1 0
X
0
10-bit conversion result.
XSEL. Screen conversion status. 0 = Y
coordinate, 1 = X coordinate.
RO
RO
1
Conversion type. 0 = non-screen
conversion, 1 = screen conversion.
RO
RESULT (ADDRESS 2)
11 10 9 8 7 6 5 4 3 2 1 0
RDPRESA. Read pressure A. See
description of measuring touch pressure.
RDPRESB. Read pressure B. See
description of measuring touch pressure.
PLZERO. Forces PL pin to ground. Can be
used to control an external resistor divider.
Test mode. ALWAYS WRITE TO 0.
Don't Care.
WO
WO
WO
0
0
0
WO
-
0
X
6
MK715
Register Description (cont.)
CONTROL (ADDRESS 3)
DESCRIPTION
Read
and
Power-up
State
TYPE
11 10 9 8 7 6 5 4 3 2 1 0
0
0
0
0
0
0
Write
R/W
R/W
R/W
R/W
R/W
R/W
SEL0. Clock select 0. See page 11.
SEL1. Clock select 1. See page 11.
SEL2. Clock select 2. See page 11.
SEL3. Clock select 3. See page 11.
SEL4. Clock select 4. See page 11.
CLKSEL. Clock frequency select.
See page 11. 0 = 14.3196 MHz
1 = 14.7456 MHz
Set to 0.
R/W
0
DIS32. Determines state of 32.768 kHz
oscillatorwhenPDasserted(STATUSregister).
Always set to zero.
0
0
R/W
RO
R/W = Read/Write, RO = Read Only, WO = Write Only
Converter Control
RDPRESB
RDPRESA
SELPL SELGP ENCONR RD1PT
CONVERSION PERFORMED
Performs 2 conversions on the
0 to 1 screen - a Y and then an X
conversion. RP1PT is then cleared.
0
0
0
0
0
0
0
1
Enable conversions at rate as set
in RATE register. When screen is
touched, converter operates
0
0
0
continously until no touch is
detected. Chip then automatically
goes to low power, standby state.
Performs one conversion on GP
0 to 1
0
0
0
0
0
1
1
0
0
0
input. RD1PT is cleared.
Performs one conversion on PL
0 to 1
input. RD1PT is cleared.
Performs two conversions, a Y and
then an X, to give touch pressure
0 to 1 data. See section on touch
pressure measurement. RD1PT is
cleared.
Performs two conversions, a Y and
then an X, to give touch pressure
0 to 1 data. See section on touch
pressure measurement. RD1PT is
cleared.
0
1
1
0
0
0
0
0
0
0
The converter must be sequenced correctly - before writing RD1PT to one, the appropriate bit (e.g. SELGP) must
first be set in a previous write. Only the combinations shown above are permitted. Other combinations will give
unpredictable behavior.
7
MK715
Rate Register (Register 2) Programming
Count
0 to 5 Not permitted
P.P.S.
Count
25
26
27
28
29
30
31
32
33
34
35
40
45
50
55
60
65
70
75
80
P.P.S.
117
113
109
106
103
100
98
95
93
90
88
78
71
64
59
55
51
47
45
Count
85
P.P.S.
40
38
36
34
32
31
30
29
28
26
24
22
21
20
19
18
17
16
15
14
6
7
8
9
303
280
259
242
227
213
201
191
181
172
165
157
151
145
139
134
129
125
120
90
95
100
105
110
115
120
125
135
145
155
165
175
185
195
205
215
235
255
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
42
P.P.S. = Points Per Second. With 14.7456 MHz clock selected.
Calculating Points Per Second
The formula for determining P.P.S. is:
fin
P.P.S. =
Where fin is the frequency of the
internal clock (14.3196 MHz or
14.7456 MHz) and COUNT is
the value of the rate register.
24072+(4096×COUNT)
Power-On Reset
On application of power, an internal reset is generated that clears all bits in registers 0, 2, and 3. Register 1 is set to
32 giving a rate of 92 PPS with 14.3196 MHz selected.
Initializing the MK715
The interrupt on the MK715 can only be cleared by reading any register or, alternatively, by writing PD (register 0, bit
2) to one, which forces a powerdown. After a fault condition, initialize the MK715 by writing PD to one, then writing
PD to zero. This will always clear pending interrupts.
8
MK715
Warning - Operation under a Power Supply Switching Regulator
When using the MK715 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 MK715, so it should be disabled when the MK715 is doing screen conversions.
Interrupts
The MK715 generates an interrupt to signal a change in touch status or to signal that a conversion is complete. The
INT pin (pin 2) goes high to signal an interrupt. Interrupts are then cleared by reading any register. However, if the
MK715 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.
Touch Screen Serial Port (Four Wire)
Data is written to, and read from, the MK715 via the serial port. When writing, only 8 data bits can be
written to each 12 bit register. The 4 highest order bits (D8-D11) in each register are read only and can
never be writtern. When reading, all 12 bits are returned.
The serial port has 4 pins - serial clock (SK), chip select (CS), data in (DI), and data out (DO). The SK acts on the rising
edge. The CS acts as a reset for the serial port with CS going high initiating a cycle. The cycle consists of 2 parts -
a write followed by a read. Each part consists of 12 bits. Refer to the serial port diagram on page 10 and timing
diagram on page 20.
After CS goes high, any number of leading zeros can occur on DI. When a one is presented (even if this is the first bit
after CS goes high), this becomes the start bit. The start bit is followed by 3 op-code bits. The first is a write bit (WR),
which determines whether the data following is actually loaded into the appropriate register or not. The next two bits
are address bits, which select 1 of 4 on-chip registers. The last 8 bits are data. If WR was low, then these data bits are
ignored.
On the fourteenth SK rising edge after a start bit, DO is released from tri-state and data is clocked out of the part. This
is the read part of the cycle. The register to be read is selected with the op-code address. The data are 12 bits long.
For the result of a conversion (which is stored in register 2), this data consists of 10 bits from the ADC, a bit identifying
an X or a Y coordinate, and a bit identifying a screen conversion or a general purpose conversion. For the other 3
registers, the data are only 8 bits long, so the 12 bit output word contains four leading zeros.
After the 12 data bits are clocked out, the DO pin stays active and bits will continue to appear until CS goes low. See
the following page for the timing diagram.
Three-Wire Serial Port
To configure the serial port for 3 wires, DI must be connected to DO to form a bi-directional data line. All other timing
and configuration remain unchanged.
9
MK715
Using the General Purpose Inputs to the A to D Converter
The GP pin is a general purpose input to the 10 bit ADC. An on-chip 1.297 V reference is used, where 1.297 V is full
scale. In addition, when using a 4-wire touch screen, the PL pin is available as a general purpose input, or it can be
used as a power control for an external resistor divider:
MK715
Voltage to be
measured
SELGP, SELPL, and
PLZEROareallregister
bits.
SELGP
SELPL
GP
PL
ADC
Optional
Capacitor
PLZERO
For two voltages, the connection is as follows:
Voltage 1
MK715
SELGP
SELPL
Voltage 2
GP
ADC
PL
Optional
Capacitor
PLZERO=0
(transistor
off)
If PL or GP are unused, they should be connected to ground.
The capacitors connected to GP and PL are optional and will reduce noise on the ADC input.
10
MK715
PD
ToA-DConverter
Clock Control
ENPLL
/ 8
/ 4
/ 2
3
2
1
CLOCKMHZ
1
Phase
Locked
CLKOUT
X1
32.768kHz
SEL2
14.3196 or
X2
SEL0, SEL1
INT
CLKSEL
PD
DIS32
1
INT
SEL3
1
TOUCH#
TOUCH#
Clock Selection Tables
SEL4
SEL2
PD
ENPLL
DIS32
CLKOUT FREQ
NOTES
0
0
0
0
0
0
1
1
x
x
x
x
0
1
0
1
32.768
32.768
32.768
OFF
Power-up State
Runs only when
screen touched
Always Running
1
0
0
x
MHZ
1
1
1
0
1
1
1
0
1
x
x
x
MHZ
OFF
OFF
SEL2
CLOCKOUT
32.768 kHz
CLOCKMHZ
SEL3
INT
INT
CKSEL
SEL1
SEL0
CLOCKMHZ
14.3196
7.160
0
1
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
CLOCKMHZ
3.580
1.790
SEL4
TOUCH#
TOUCH#
14.7456
7.3728
3.6864
1.8432
0
1
CLOCKMHZ
Clocks may be programmed to be on any of three pins per the description above. The clocks are controlled by the
following register bits (see register description for more details): STATUS register, bits 2 and 3; and CONTROL
register bits 0, 1, 2, 3, 4, 5, 7.
11
MK715
Power and Clock Control
The power consumed by the MK715 can be controlled by programming various register bits.
Is the Screen
Touched?
PD
DIS32
ENPLL
ENCONR
Chip Condition
Typical IDD
1
0
X
X
X
Everything off
0
Everything off except crystal
oscillator and 32kHz output (if
selected)
1
0
1
X
0
X
0
X
4mA
4mA
Everything off except crystal
ocsillator and 32 kHz
output.TOUCH# and INT pins
respond to changes in touch status.
X
No
Everything off except crystal
ocsillator and 32 kHz
output.TOUCH# and INT pins
respond to changes in touch status.
0
0
X
X
0
1
0
0
Yes
X
40mA
Everything off except crystal
oscillator, PLL and clock outputs.
TOUCH# and INT pins respond to
changes in TOUCH status.
2mA (depends on
clock frequency
and loading
Everything off except crystal
oscillator and clock outputs.
0
0
X
X
0
1
1
1
No
4mA
Everything off except crystal
oscillator, PLL and clock outputs.
NO
2mA
5mA(See Power
Supply Current
graphs)
0
X
X
1
Yes
ADC, PLL, etc. operating.
12
MK715
Recommended Circuit
DI
To Power Management
To Interrupt Controller
To Microcontroller
TOUCH#
INT
From
Microprocessor
D0
CS
SK
CLKOUT
X2
XH
XL
YH
YL
32.768 kHz
Crystal
X1
To Touch
Screen
PL
GP
Analog Voltage
VDD
CAP3
+ 3.3V or +5V
0.01mF
All 0.01mF
1mF
GND
0.01mF
CAP2 CAP1
470 pF
100kW 0.01mF
The capacitors connected to CAP1 and CAP3 must be low leakage, ceramic type capacitors.
Pen Bounce
When the screen is untouched, theY 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 MK715. This initiates a conversion, as long as conversions at rate
(ENCONR) 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 the current X or Y points have been taken.
If the pen is lifted during a conversion, this will also not be detected until the conversion is complete.
13
MK715
Optimizing Performance when Reading and Writing Registers
Reading and writing the MK715 generates digital noise that may reduce the accuracy of the A to D converter. This
noise has several causes, including board layout, and power supply voltage. By appropriately timing the register
operations, the effects of this noise can be minimized.
After an interrupt is issued or RDIPT is asserted, the MK715 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.
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.
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.
14
MK715
Analog to Digital Converter Operation with a Touchscreen
The 10-bit ADC converts X and Y co-ordinates at a rate determined by register 1. 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. 1023) 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 511. 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 up to 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
Full
Scale
Screen
(1023)
Interconnect
MK715
Screen
YL
XL
Screen
Interconnect
X
Coordinate
Board and Wire
Interconnect
15
MK715
Measuring Touch Pressure
Measuring touch pressure can only be performed on 4-wire touchscreens. In normal operation, the screen drivers
force XH high and XL to ground and measure the voltage on the other plate. A schematic of this is as follows:
Voltage measured on YH is the same as at K
and L giving the X co-ordinate.
When RDPRESA is asserted, the screen drive changes as follows (XSEL=1):
Voltage measured on YH is now the voltage at
L. Voltage measured at XL is now the voltage
at K. The difference is proportional to the
touch pressure.
WhenRD1PTisasserted, theconverterautomaticallyperformstwoconversions. Thestatusof theXSELbitidentifies
the conversions. The following table gives the four measurements available.
RDPRESB RDPRESA
XSEL
DRIVE
YH, XL
XH, YL
YH, XL
XH, YL
PIN MEASURED
0
0
1
1
1
1
0
0
0
1
0
1
XH
YH
YL
Both points returned
in one conversion pair.
Both points returned
in one conversion pair.
XL
From these four measurements, the resistance of the touch can be calculated as a proportion of x-plate and y-plate
resistance. See the next section for suggestions about calculating the touch resistance. From this, the touch pressure
can be inferred. See the table on page 7 for the correct register sequencing of the converter.
16
MK715
Calculating Touch Resistance
There are a total of six measurements possible:
RDPRESB RDPRESA
XSEL
DRIVE
YH, YL
XH, XL
YH, XL
XH, YL
YH, XL
XH, YL
PIN MEASURED RESULT
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
XH
YH
XH
YH
YL
C
D
E
F
G
H
XL
where the result is a number from 0 to 1023.
From simple network theory, RTOUCH can be represented in many ways, 3 are given below:
D
1023
G
E
RTOUCH = RX ·
· ( - 1)
where RX = X plate resistance
where RY = Y plate resistance
C
1023
H
or
or
RTOUCH = RY ·
· ( - 1)
F
RY · C
1023
RX
E
D
1023
RTOUCH
=
·
· (1023 - E) - RY +
17
MK715
Electrical Specifications
Parameter
ABSOLUTE MAXIMUM RATINGS (Note 1)
Inputs and Clock Outputs
Conditions
Minimum
Typical
Maximum
Units
Referenced to GND
Max of 20 seconds
-0.5
0
VDD+0.5
70
V
C
C
C
Ambient Operating Temperature
Soldering Temperature
260
Storage Temperature
-65
150
DC CHARACTERISTICS (VDD = 3.3 V OR 5 V (unless noted)
Operating Voltage, VDD
3
2
5.5
0.8
V
V
Input High Voltage
VDD = 5 V
Input Low Voltage, VIL
VDD = 5 V
IOH = -2mA
V
Output High Voltage, VOH
Output High Voltage, VOH
Output Low Voltage, VOL
Input High Voltage, VIH
VDD-0.4
2.4
V
VDD = 5 V, IOH = 12mA
VDD = 5 V, IOL = 12mA
VDD = 3.3 V
V
.04
0.4
0.4
V
1.9
2.4
V
Input Low Voltage, VIL
VDD = 3.3 V
V
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, at VDD=5 V
Operating Supply Current, IDD, at VDD=3.3 V
Operating Supply Current IDD standby, clock on
Operating Supply Current, IDD power down
Short Circuit Current
VDD = 3.3 V, IOH = -6mA
VDD = 3.3 V, IOL = 6mA
note 2
V
V
5
3
mA
mA
note 2
note 3
3
A
A
m
m
PD=1, no clock
Each output
0.2
3
50
7
mA
pF
±
Input Capacitance
Resolution
10
bits
LSB
W
±
2
Non-linearity
Monotonic, note 4
VDD = 3.3 V, 25 C
Touch Screen Resistance
Voltage Reference
100
2000
1.266
1.279
1.292
V
AC CHARACTERISTICS (VDD = 3.3 V OR 5 V (unless noted)
Input Clock or Crystal Frequency
32.768
kHz
ns
Output Rise Time
Output Fall TIme
0.8 to 2.0 V, VDD = 5 V
2.0 to 0.8 V, VDD =5 V
3
3
ns
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 relaibility.
2. Assumes 300 W screen, 100 pps.
3. Assumes no touch.
4. With no missing codes.
18
MK715
MK715 TIMING DIAGRAM
A
B
1
2
3
4
SK
CS
DI
WR
A1
C
E
D
Tri-State
DO
15
16
25
14
SK
CS
DI
Don't Care
D10
D11
DO
D9
D1
D0
G
F
F
MIN
50
15
15
15
15
20
MAX
(SK Period) -15
A SK Period
B SK High TIme
ns
ns
ns
ns
ns
ns
ns
C CS Setup to SK high
D DI Setup to SK high
E DI Hold from SK high
F DO valid from SK high
G CS hold from last SK high
50
19
MK715
20
MK715
Pin 1 20
2
19
18
17
16
15
14
13
12
11
3
G
4
V
0.01µF
5
0.01µF
0.01µF
32768 Hz
6
To
Touch
Screen
7
G
8
1000 pF
9
100kW
10
G
0.01µF
G
G
V
= Connection to ground plane
= Connection to VDD plane
Notes: 1. All digital signals should be kept well away from pins 5, 6, 7, 8, 9, 10,
11, 12, 13, 15, 16 and any traces connected to those pins.
21
MK715
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)
20pinSSOP(ininches)
Symbol
Min
Max
A
A1
B
0.053
0.004
0.008
0.007
0.337
0.150
0.069
0.010
0.012
0.010
0.344
0.157
C
D
E
e
0.025 BSC
H
L
0.228
0.016
0.244
0.050
A1
C
L
B
L
Ordering Information
Part/Order Number
MK715R
Marking
MK715R
MK715R
Shipping
Tubes
MK715RTR
Tape and Reel
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126 (408)295-9800tel www.icst.com
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all device
data to verify that any information being relied upon by the customer is current and accurate.
22
相关型号：
MK71511-NNN
蓝碧石科技的“MK71511(A)”和“MK71521(A)”是支持Bluetooth 5的Bluetooth low energy单模无线模块。 “MK71511(A)”内置Nordic公司的nRF52811，“MK71521(A)”内置Nordic公司的nRF52832。“MK71511(A)”和“MK71521(A)”支持2Mbps高速传输（Bluetooth 5标准的特点之一）和提高通知数据容量（扩展广告），与Bluetooth 4标准相比，数据通信时间仅为一半，可处理通知数据容量高达8倍。而且，“MK71511(A)”还内置远距离传输功能，通信距离延长至以往Bluetooth的4倍，因此，不仅非常适用于室内应用，还非常适用于户外应用。不仅如此，还内置方向检测功能，因此还可以应用于可高精度识别位置的室内定位服务。而“MK71521(A)”则内置了保存程序用的512KB大容量FLASH存储器，非常适用于利用Bluetooth构建网状网络和各种应用产品的开发。此外，这两种产品具有相同的形状，而且引脚兼容，可以轻松替换，还可以安装在便宜的2层电路板上，有助于降低制造成本。
ROHM
MK71511A-NNN
蓝碧石科技的“MK71511(A)”和“MK71521(A)”是支持Bluetooth 5的Bluetooth low energy单模无线模块。 “MK71511(A)”内置Nordic公司的nRF52811，“MK71521(A)”内置Nordic公司的nRF52832。“MK71511(A)”和“MK71521(A)”支持2Mbps高速传输（Bluetooth 5标准的特点之一）和提高通知数据容量（扩展广告），与Bluetooth 4标准相比，数据通信时间仅为一半，可处理通知数据容量高达8倍。而且，“MK71511(A)”还内置远距离传输功能，通信距离延长至以往Bluetooth的4倍，因此，不仅非常适用于室内应用，还非常适用于户外应用。不仅如此，还内置方向检测功能，因此还可以应用于可高精度识别位置的室内定位服务。而“MK71521(A)”则内置了保存程序用的512KB大容量FLASH存储器，非常适用于利用Bluetooth构建网状网络和各种应用产品的开发。此外，这两种产品具有相同的形状，而且引脚兼容，可以轻松替换，还可以安装在便宜的2层电路板上，有助于降低制造成本。
ROHM
MK71521-NNN
蓝碧石科技的“MK71511(A)”和“MK71521(A)”是支持Bluetooth 5的Bluetooth low energy单模无线模块。 “MK71511(A)”内置Nordic公司的nRF52811，“MK71521(A)”内置Nordic公司的nRF52832。“MK71511(A)”和“MK71521(A)”支持2Mbps高速传输（Bluetooth 5标准的特点之一）和提高通知数据容量（扩展广告），与Bluetooth 4标准相比，数据通信时间仅为一半，可处理通知数据容量高达8倍。而且，“MK71511(A)”还内置远距离传输功能，通信距离延长至以往Bluetooth的4倍，因此，不仅非常适用于室内应用，还非常适用于户外应用。不仅如此，还内置方向检测功能，因此还可以应用于可高精度识别位置的室内定位服务。而“MK71521(A)”则内置了保存程序用的512KB大容量FLASH存储器，非常适用于利用Bluetooth构建网状网络和各种应用产品的开发。此外，这两种产品具有相同的形状，而且引脚兼容，可以轻松替换，还可以安装在便宜的2层电路板上，有助于降低制造成本。
ROHM
MK71521A-NNN
蓝碧石科技的“MK71511(A)”和“MK71521(A)”是支持Bluetooth 5的Bluetooth low energy单模无线模块。 “MK71511(A)”内置Nordic公司的nRF52811，“MK71521(A)”内置Nordic公司的nRF52832。“MK71511(A)”和“MK71521(A)”支持2Mbps高速传输（Bluetooth 5标准的特点之一）和提高通知数据容量（扩展广告），与Bluetooth 4标准相比，数据通信时间仅为一半，可处理通知数据容量高达8倍。而且，“MK71511(A)”还内置远距离传输功能，通信距离延长至以往Bluetooth的4倍，因此，不仅非常适用于室内应用，还非常适用于户外应用。不仅如此，还内置方向检测功能，因此还可以应用于可高精度识别位置的室内定位服务。而“MK71521(A)”则内置了保存程序用的512KB大容量FLASH存储器，非常适用于利用Bluetooth构建网状网络和各种应用产品的开发。此外，这两种产品具有相同的形状，而且引脚兼容，可以轻松替换，还可以安装在便宜的2层电路板上，有助于降低制造成本。
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Low Skew Clock Driver, CB Series, 16 True Output(s), 0 Inverted Output(s), CMOS, PDSO28, 0.150 INCH, SSOP-28
IDT
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