Description
XN-1SSI Micro innovative touch screen
XN-1SSI Micro innovative touch screen
Module Clips Drive controller servo moto
XN-1SSI Micro innovative touch screenSuitable for steel manufacturing, thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, gas supply, and other glass manufacturing, paper mills, mechanical manufacturing, electronic manufacturing, automotive manufacturing, aviation manufacturing, chemical manufacturing, coal mining and selection, oil and natural gas mining and selection, metal mining and selection, and non-metallic mining and selection
3 Basic characteristics and typical applications of ADS7846
3.1 Basic features
ADS7846 is a 4-wire touch screen controller produced by Analog Devices. It is currently widely used in resistive touch screen input systems.
The ADS7846 digital converter operates in a 12-bit successive approximation comparison register (SAR) ADC architecture integrating low-pass
impedance switches for driving touch screens. These devices do not use an internal reference voltage and consume less than 1.4mW maximum
power when operating at a throughput rate greater than 125kp/s. They also have 10keV to 12keV analog input ESD protection for enhanced ESD immunity to
avoid damage to critical internal system components. Operates from a single 2.2V to 5.25V supply. A complete operation of the AD7846 serial interface requires
24 DCLKs., former 8 pulses receive 8-bit commands, and start sampling on the rising edge of the 6th pulse. Starting from the 9th pulse, it enters the conversion phase, outputs a
12-bit sample value, and enters the idle phase after the conversion. Until the end of 24 DCLKs, CS Set to high level, one measurement ends.
3.2 Interface circuit and coordinate value acquisition of resistive touch screen
Figure 3 shows the interface circuit between ADS7846 and PhilipsARM7 chip LPC2210.
The ADS7846 chip switches the on-chip analog electronic switch, connects the X+ (Y+) terminal to the positive power supply VCC
, connects the X- (Y-) terminal to the ground, and connects the X+ (Y+) and X- (Y-) terminals to A in differential form /D converter input.
When a pen is used to click on different positions of the touch screen, due to the different voltages input to the A/D converter (see the previous voltage dividing principle), the output
value of the pen touch point is obtained after A/D conversion, and the output value is the same as the pen touch point. position has an approximately linear relationship. Therefore, the
ADS7846 can obtain the relative position of the pen touch point on the touch screen.
3.3 Causes of errors and elimination methods
The main reasons that affect the accuracy of coordinate values are:
① The uniformity of the resistive material of the touch screen itself may cause uneven voltage division due to material uniformity issues, which will inevitably affect the accuracy of the output.
②The jitter problem of touch during pressing and releasing.
③The internal resistance of the ADS7846 analog switch and the conversion accuracy of the A/D converter itself.
④ESD interference problem.
Problems ① and ③ are inherent problems of the device and cannot be eliminated. For the second problem, the key vibration can be reduced through software. A better method is to use two
key value comparisons. The specific working principle is to continuously measure the X and Y coordinate values twice, and then compare them. If they are the same or the difference is
within the allowed error range, it is considered a valid key, otherwise it is invalid. key.
Regarding the ESD problem, this is the main problem faced during design. The specific measures are mainly as follows:
(1) The analog ground of ADS7846 is not connected to the digital ground of the system at one point. Digital interference is coupled to the analog ground of the ADS7846 by the common
impedance, causing interference and causing jitter. The solution is to connect analog ground to digital ground at one point.
(2) The successive comparison A/D converter of the ADS7846 is very sensitive to power supply and digital writing. The solution is to place a 10μF bypass capacitor near the power pin and a
0.1μF bypass capacitor at the reference voltage input terminal. circuit capacitance.
(3) In situations where electromagnetic interference is relatively strong, in order to prevent the high-frequency interference pulses generated by the touch screen pins from interfering with the
ADS7846, a 0.001μF high-frequency rectifier capacitor should be connected to the key pins DCLK, DIN, and DOUT to ground . When wiring the PCB, the connection from the screen to the chip should also be short and thick.
Contact: Mr. Lai
Wechat:17750010683
Whats app：+86 17750010683
Skype：+86 17750010683
QQ: 3221366881
3221366881@qq.com
XN-S4S-SBBS-CJ Imported from Eaton’s original factory
XV-440-10TVB-1-10 Eaton touch screen
XV-102-B5-35TQR-10-PLC Micro innovative touch screen
XV-440-10TVB-X-13-1 Industrial control panel
XV-152-D8-10TVR-10 Micro innovative touch screen
XV-102-E8-70TWRC-10 Industrial control panel
XVS-440-10MPI-1-1U Micro innovative touch screen
MH2-340-57CAN-1-10 Eaton touch screen
XV-440-10TVB-1-20 Micro innovative touch screen
OS-FLASH-A1-S Eaton touch screen
XN-P3T-SBB Eaton touch screen
XP-702-E0-15TXIJ-10 Imported from Eaton’s original factory
XV-252-57MPN-1-10-PLC Imported from Eaton’s original factory
XVH-330-57BAS-1-10 Imported from Eaton’s original factory
XN-2AO-I(0/4…20MA) Eaton touch screen
XV-102-A2-35MQR-10 Full range touch screen EATON
XV-102-D6-57TVR-10 Full range touch screen EATON
XV-252-57CNN-1-10-PLC Micro innovative touch screen
XV-152-D6-84TVRC-10 Imported from Eaton’s original factory
XV-303-70-B00-A00-1C Industrial control panel
XNE-4AO-U/I Imported from Eaton’s original factory
XV-442-57CQB-1-1Q Imported from Eaton’s original factory
XT-DVI-D-10-01 Industrial control panel
XP-503-15-A10-A00-1B Industrial control panel
XVS-460-57MPI-1-10 Eaton touch screen
MC2-430-10TVB-1-11 Full range touch screen EATON
XNE-8DI-24VDC-P Full range touch screen EATON
XV-252-57CNN-1-1K Full range touch screen EATON
XN-P4S-SBBC-B Industrial control panel
XV-102-B4-35TQRF-10 Eaton touch screen
XV-152-D8-57TVRC-10 Full range touch screen EATON
XN-KO/3 Full range touch screen EATON
XV-442-57CQB-1-10 Full range touch screen EATON
XV-102-D8-70TWR-10 Micro innovative touch screen
XV-303-10-CE0-A00-1C Full range touch screen EATON
PGGLOBLPMNTD Eaton touch screen
XV-102-B5-35MQR-10-PLC Imported from Eaton’s original factory
MK2-232-57BAS-1-10 Industrial control panel
XN-2DI-120/230VAC Imported from Eaton’s original factory
XV-102-B4-35TQRF-1AN Full range touch screen EATON
XN-4AI-U/I Micro innovative touch screen
XVS-460-15MPI-1-10 Full range touch screen EATON
XVS-440-10MPI-1-1U Eaton touch screen
OS-HDU-A7-SI Eaton touch screen
XVC-601-GTI-12-DPS-V1-000 Full range touch screen EATON
XV-102-H3-70TWRL-10 Industrial control panel
xv-440-10tvb-1-20 Micro innovative touch screen
XVH-340-57MPI-1-13 Eaton touch screen
XN-2DO-R-NO Full range touch screen EATON
XV-DVI-GTI-15-000 Full range touch screen EATON
MV4-690-TA1-XX0 Full range touch screen EATON
XV-440-10TVB-1-10 Eaton touch screen
XVS-440-10MPI-1-10 Imported from Eaton’s original factory
XP-503-21-A10-A00-1V Industrial control panel
XVS-440-10MPI-1-1U Eaton touch screen
XVS-440-10MPI-1-1U Imported from Eaton’s original factory
MTL831C Eaton touch screen
XVS-440-57MPI-1-1U Industrial control panel
XV-152-E6-10TVRC-10 Imported from Eaton’s original factory
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
