XPT2046(XPT2046).pdf-资料库

XPT2046 Touch Screen Controller XXPPTT22004466 DDaattaa SShheeeett 2007.5 CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 1/30

XPT2046 Touch Screen Controller CONTENTS GENERAL DESCRIPTION .............................................................................................................3 FEATURES.........................................................................................................................................3 APPLICATIONS................................................................................................................................3 BLOCK DIAGRAM ..........................................................................................................................4 ABSOLUTE MAXIMUM RATINGS ..............................................................................................4 ELECTRICAL CHARACTERISTICS ...........................................................................................5 PIN CONFIGURATION ...................................................................................................................8 PIN LAYOUT ......................................................................................................................................8 PIN DESCRIPTION...............................................................................................................................9 TYPICAL CHARACTERISTICS..................................................................................................10 THEORY OF OPRATION..............................................................................................................13 BASIC OPERATION OF THE XPT2046...............................................................................................13 ANALOG INPUT................................................................................................................................14 INTERNAL REFERENCE.....................................................................................................................15 REFERENCE INPUT ...........................................................................................................................16 SIMPLIFIED DIAGRAM OF SINGLE-ENDED REFERENCE ....................................................................16 SIMPLIFIED DIAGRAM OF DIFFERENTIAL REFERENCE......................................................................17 TOUCH SCREEN SETTLING...............................................................................................................17 TEMPERATURE MEASUREMENT.......................................................................................................18 BATTERY MEASUREMENT ...............................................................................................................19 PRESSURE MEASUREMEN ................................................................................................................20 DIGITAL INTERFACE...................................................................................................................21 PENIRQ OUTPUT ..........................................................................................................................24 PER-CONVERSION .......................................................................................................................26 16 CLOCKS-PER-CONVERSION.........................................................................................................26 DIGITAL TIMING..............................................................................................................................26 15 CLOCKS-PER-CONVERSION.........................................................................................................28 DATA FORMAT ................................................................................................................................28 8-BIT CONVERSION .........................................................................................................................29 POWER DISSIPATION ..................................................................................................................29 DEMO ...............................................................................................................................................30 CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 2/30

XPT2046 Touch Screen Controller General Description The XPT2046 is a 4-wire resistive touch screen controller that incorporates a 12-bit 125 kHz sampling SAR type A/D converter. The XPT2046 operates down to 2.2V supply voltage and supports digital I/O interface voltage from 1.5V to VCC in order to connect low voltage uP. The XPT2046 can detect the pressed screen location by performing two A/D conversions. In addition to location, the XPT2046 also measures touch screen pressure.On-chip VREF can be utilized for analog auxiliary input, temperature measurement and battery monitoring withthe ability to measure voltage from 0V to 5V. The XPT2046 also has an on-chip temperature sensor The XPT2046 is available in 16pin QFN thin package(0.75mm in height) and has the operating temperature range of -40°C to +85°C Features 12 bit SAR type A/D converter with S/H circuit Low voltage operation (VCC = 2.2V ∼ 3.6V) Low voltage digital I/F (1.5V ∼ VCC) 4-wire I/F Sampling frequency: 125 kHz (max) On-Chip voltage reference (2.5V) Pen pressure measurement On-chip thermo sensor Direct battery masurement Low power consumption (260μA) Package 16pin QFN Applications Personal digital assistants Portable instruments Point -of-sale terminals Pagers Touch screen monitors Cellular phones CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 3/30

XPT2046 Touch Screen Controller Block Diagram Figure 1. Block Diagram Absolute Maximum Ratings +VCC and IOVDD to GND Analog Inputs to GND Digital Inputs to GND Power Dissipation Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (soldering, 10s) −0.3V to +6V −0.3V to +VCC + 0.3V −0.3V to IOVDD + 0.3V . 250mW +150°C . −40°C to +85°C −65°C to +150°C +300°C Table 1. Absolute Maximum Ratings WARNING: Stresses above these ratings may cause permanent damage.Exposure to absolute maximum conditions for xtended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 4/30

XPT2046 Touch Screen Controller Electrical Characteristics: VS = +2.7V to +5.5V At TA = −40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, digital inputs = GND or IOVDD, and +VCC must be • IOVDD. PARAMETER CONDITION ANALOG INPUT Full-Scale Input Span Absolute Input Range Capacitance Leakage Current SYSTEM PERFORMANCE Resolution No Missing Codes Integral Linearity Error Offset Error Gain Error Noise Power-Supply Rejection SAMPLING DYNAMICS Conversion Time Acquisition Time Throughput Rate Multiplexer Settling Time Aperture Delay Aperture Jitter Channel-to-Channel Isolation SWITCH DRIVERS On-Resistance YP、XP YN、XN Drive Current(2) REFERENCE OUTPUT Internal Reference Voltage Internal Reference Drift Quiescent Current Positive Input−Negative Input Positive Input Negative Input External VREF Including Internal VREF VIN＝2.5Vpp，fs＝50KHz Duration 100ms MIN 0 -0.2 -0.2 11 3 2.45 XPT2046 TYP 25 0.1 12 70 70 500 30 100 100 5 6 2.50 15 500 MAX VREF +VCC+0.2 +0.2 ±2 ±6 ±4 12 125 50 2.55 UNITS V V V pF µA Bits Bits LSB1 LSB LSB µVrms dB CLK Cycles CLK Cycles KHz ns ns ps dB Ω Ω mA V ppm/℃ µA CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 5/30

XPT2046 Touch Screen Controller 1.0 0.5 -2 -3 -40 IOVDD*0.7 -0.3 IOVDD*0.8 2.7 2.2 1.5 REFERENCE INPUT Range Input Impedance BATTERY MONITOR Input Voltage Range Input Impedance Sampling Battery Battery Monitor Off Accuracy TEMPERATURE ASUREMENT Temperature Range Resolution Accuracy DIGITAL INPUT/OUTPUT Logic Family Capacitance VIH VIL VOH VOL Data Format SER/—— DFR＝0，PD1＝0 Internal Reference Off Internal Reference On VBAT=0.5V~5.5V, ExternalVREF=2.5V VBAT=0.5V~5.5V, Internal Reference Differential Method(3) TEMP0(4) Differential Method(3) TEMP0(4) All Digital Control Input Pins | IIH |≤+5µA | IIL |≤+5µA IOH=-250µA IOL=250µA POWER-SUPPLYREQUIREMENTS +VCC (5) IOVDD (6) Quiescent Current (7) Power Dissipation Specified Performance Operating Range Internal Reference Off Internal Reference On fSAMPLE = 12.5kHz Power-Down Mode with (CS=DCLK=DIN=IOVDD) VCC=+2.7V 1 250 10 1 1.6 0.3 ±2 ±3 CMOS 5 Straight Binary 280 780 220 VCC 6.0 +2 +3 +85 15 IOVDD+0.3 0.3*IOVDD 0.4 3.6 5.25 VCC 650 3 1.8 V GΩ Ω V KΩ GΩ % % ℃ ℃ ℃ ℃ ℃ pF V V V V V V V µA µA µA µA mW CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 6/30

XPT2046 Touch Screen Controller TEMPERATURE RANGE Specified Performance -40 +85 ℃ Table 2. Electrical Characteristics (1) LSB means Least Significant Bit. With VREF = +2.5V, one LSB is 610 V.　 (2) Assured by design, but not tested. Exceeding 50mA source current may result in device degradation. (3) Difference between TEMP0 and TEMP1 measurement, no calibration necessary. (4) Temperature drift is −2.1mV/ C.　 (5) XPT2046 operates down to 2.2V. (6) IOVDD must be − (+VCC). (7) Combined supply current from +VCC and IOVDD. Typical values obtained from conversions on AUX input with PD0 = 0. CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 7/30

XPT2046 Touch Screen Controller Pin Configuration Pin Layout QFN-16 TSSOP－16 VFBGA-16 Figure 2. Pin Layout CCooppyyrriigghhtt©©22000077,, SSHHEENNZZHHEENN XXPPTTEEKK TTEECCHHNNOOLLOOGGYY CCOO..,,LLTTDD http://www.xptek.com.cn 8/30

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