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Touch screen light switch panel - Touch Screen Controllers

Touch screen interfaces are a highly effective medium of operating personal devices (like smartphones, tablets, etc.) or public informational devices (ATMs and ticket vending machines, for example) because of their highly interactive and user-friendly nature. Touch screen switch panels are also gaining popularity and can be seen in the control panel of cars, smart washing machines, and many other appliances. A variety of touch screen light switch is being used today in different types of applications, each having their own advantages and drawbacks. The two main types of touch screens used today are the resistive touch screens and the capacitive touch screens.

The resistive touch screen senses a touch when the pressure applied by the touch leads to contact between the two conductive layers of the screen. A capacitive touch screen, on the other hand, detects a touch when static charge from the screen is transferred to the human skin or stylus. Due to low prices, the resistive touch screens are preferred over other touch screens in areas where image quality can be compromised for low prices.

When a touch screen is touched at a given point on the touch screen, it creates an analog signal that containing some noise, which needs to be filtered and converted into digital signals, which is known as Data Acquisition. Also, when a touch screen is pressed, it leads to vibrations in the conductive layers and inductive and capacitive effects due to the drivers. The reading can be taken only when the voltage has settled. The time elapsed until this happens is called the settling-time. This settling-time also needs to be taken into account while taking the readings. Be

cause of such challenges, sensing and interpreting the touch signals requires a very advanced and sophisticated system which is generally called Touch Screen Controllers. These systems are available in the form of small chips (ICs).

As soon as the screen is touched, a series of processes are triggered inside the touch screen controllers. First of all, a few readings for the X-coordinate of the touched region are taken. After this, several readings are taken for the Y-coordinates as well. Similar happens for Z-values (if the system supports three-dimensional analysis). After this is done, the values of X, Y, and Z readings are averaged to reduce the noise in the signal. Then, the touch screen controller checks if the variation between different readings doesn’t fall outside a particular range or else, the readings are discarded and the whole process is repeated from the beginning.

The whole process involved in determining the position of the touch is carried out by the intelligent touch screen controller and no involvement is required from the CPU but the CPU just receives the final result and then processes it.

Data Acquisition - Touch Screen Controllers

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Image
Part Number
Manufacturer
Description
Package
Stock
Quantity
Resolution (Bits)
Interface
Voltage Reference
Voltage - Supply
Current - Supply
Operating Temperature
Mounting Type
Package / Case
Supplier Device Package
AD7879ACBZ-500R7
Analog Devices Inc.

IC ADC 12BIT CTLR TOUCH 16CSP

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: SPI
  • Voltage Reference: External
  • Voltage - Supply: 1.6 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-VQFN Exposed Pad, CSP
  • Supplier Device Package: 16-LFCSP-VQ (4x4)
Package: 16-VQFN Exposed Pad, CSP
Stock263
12 b
SPI
External
1.6 V ~ 3.6 V
-
-40°C ~ 85°C
Surface Mount
16-VQFN Exposed Pad, CSP
16-LFCSP-VQ (4x4)
AT42QT4160-MU
Microchip Technology

IC SCREEN CNTRL 10BIT 32MLF

  • Touchscreen: 2 Wire Capacitive
  • Resolution (Bits): 10 b
  • Interface: I2C
  • Voltage Reference: External, Internal
  • Voltage - Supply: 1.8 V ~ 5.5 V
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: 32-VFQFN Exposed Pad
  • Supplier Device Package: 32-MLF? (5x5)
Package: 32-VFQFN Exposed Pad
Stock150
10 b
I2C
External, Internal
1.8 V ~ 5.5 V
-
-
Surface Mount
32-VFQFN Exposed Pad
32-MLF? (5x5)
SX8656IWLTRT
Semtech Corporation

IC TOUCH SCREEN 12BIT 20QFN

  • Touchscreen: 4 or 5 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: I2C, Serial
  • Voltage Reference: Internal
  • Voltage - Supply: 2.3 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-WFQFN Exposed Pad
  • Supplier Device Package: 20-QFN (4x4)
Package: 20-WFQFN Exposed Pad
Stock221
12 b
I2C, Serial
Internal
2.3 V ~ 3.6 V
-
-40°C ~ 85°C
Surface Mount
20-WFQFN Exposed Pad
20-QFN (4x4)
hotAD7889ACBZ-500R7
Analog Devices Inc.

IC ADC 12BIT CTRLR TOUCH 12WLCSP

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: SPI
  • Voltage Reference: External
  • Voltage - Supply: 1.6 V ~ 3.6 V
  • Current - Supply: 10nA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 12-UFBGA, WLCSP
  • Supplier Device Package: 12-WLCSP (1.51x2.01)
Package: 12-UFBGA, WLCSP
Stock971
12 b
SPI
External
1.6 V ~ 3.6 V
10nA
-40°C ~ 85°C
Surface Mount
12-UFBGA, WLCSP
12-WLCSP (1.51x2.01)
MAX11811GTP/V+T
Maxim Integrated

IC TOUCH SCREEN CTRLR LP 20TQFN

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: I2C, Serial
  • Voltage Reference: -
  • Voltage - Supply: 1.7 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 105°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-WFQFN Exposed Pad
  • Supplier Device Package: 20-TQFN (4x4)
Package: 20-WFQFN Exposed Pad
Stock416
12 b
I2C, Serial
-
1.7 V ~ 3.6 V
-
-40°C ~ 105°C
Surface Mount
20-WFQFN Exposed Pad
20-TQFN (4x4)
MPR181EJR2
NXP

IC CTLR TOUCH SENSOR 8-TSSOP

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: 16-TSSOP (0.173", 4.40mm Width)
  • Supplier Device Package: 16-TSSOP
Package: 16-TSSOP (0.173", 4.40mm Width)
Stock107
-
-
-
-
-
-
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
MAX11802ETC+
Maxim Integrated

IC CTRLR TOUCH-SCREEN 12-TQFN

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: SPI
  • Voltage Reference: -
  • Voltage - Supply: 1.7 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 12-WQFN Exposed Pad
  • Supplier Device Package: 12-TQFN (4x4)
Package: 12-WQFN Exposed Pad
Stock429
12 b
SPI
-
1.7 V ~ 3.6 V
-
-40°C ~ 85°C
Surface Mount
12-WQFN Exposed Pad
12-TQFN (4x4)
hotMK712RI
IDT, Integrated Device Technology Inc

IC TOUCH SCREEN CTLR 28-SSOP

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: Parallel
  • Voltage Reference: -
  • Voltage - Supply: 3 V ~ 5.5 V
  • Current - Supply: 5mA
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: 28-SSOP (0.154", 3.90mm Width)
  • Supplier Device Package: 28-QSOP
Package: 28-SSOP (0.154", 3.90mm Width)
Stock10,104
12 b
Parallel
-
3 V ~ 5.5 V
5mA
-
Surface Mount
28-SSOP (0.154", 3.90mm Width)
28-QSOP
FTCS0464
NKK Switches

TOUCH SCREEN

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): -
  • Interface: Serial, USB
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -20°C ~ 70°C
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock308
-
Serial, USB
-
-
-
-20°C ~ 70°C
-
-
-
MTCH6303T-I/PT
Microchip Technology

IC TOUCH CTRLR 64TQFP

  • Touchscreen: 2 Wire Capacitive
  • Resolution (Bits): -
  • Interface: I2C, USB
  • Voltage Reference: -
  • Voltage - Supply: 2.3 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 64-TQFP
  • Supplier Device Package: 64-TQFP (10x10)
Package: 64-TQFP
Stock188
-
I2C, USB
-
2.3 V ~ 3.6 V
-
-40°C ~ 85°C
Surface Mount
64-TQFP
64-TQFP (10x10)
SX8677ICSTRT
Semtech Corporation

IC SCREEN CNTRL 12BIT 19WLCSP

  • Touchscreen: 4 or 5 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: I2C, Serial
  • Voltage Reference: Internal
  • Voltage - Supply: 2.3 V ~ 3.6 V
  • Current - Supply: 120µA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 19-UFBGA, WLCSP
  • Supplier Device Package: 19-WLCSP (2.07x2.07)
Package: 19-UFBGA, WLCSP
Stock155
12 b
I2C, Serial
Internal
2.3 V ~ 3.6 V
120µA
-40°C ~ 85°C
Surface Mount
19-UFBGA, WLCSP
19-WLCSP (2.07x2.07)
AR1021T-I/ML
Microchip Technology

IC CTRLR TOUCH SENSE 20QFN

  • Touchscreen: 4, 5, or 8 Wire Resistive
  • Resolution (Bits): 10 b
  • Interface: I2C, Serial, SPI
  • Voltage Reference: -
  • Voltage - Supply: 2.5 V ~ 5 V
  • Current - Supply: 17mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-VFQFN Exposed Pad
  • Supplier Device Package: 20-QFN (4x4)
Package: 20-VFQFN Exposed Pad
Stock332
10 b
I2C, Serial, SPI
-
2.5 V ~ 5 V
17mA
-40°C ~ 85°C
Surface Mount
20-VFQFN Exposed Pad
20-QFN (4x4)
MTCH6102T-I/SS
Microchip Technology

IC TOUCH CTLR PROJECTED 28SSOP

  • Touchscreen: 2 Wire Capacitive
  • Resolution (Bits): -
  • Interface: I2C
  • Voltage Reference: -
  • Voltage - Supply: 1.8 V ~ 3.6 V
  • Current - Supply: 1.17mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 28-SSOP (0.209", 5.30mm Width)
  • Supplier Device Package: 28-SSOP
Package: 28-SSOP (0.209", 5.30mm Width)
Stock162
-
I2C
-
1.8 V ~ 3.6 V
1.17mA
-40°C ~ 85°C
Surface Mount
28-SSOP (0.209", 5.30mm Width)
28-SSOP
SX8653ICSTRT
Semtech Corporation

IC SCREEN CNTRL 12BIT 12WLCSP

  • Touchscreen: 4 or 5 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: SPI
  • Voltage Reference: Internal
  • Voltage - Supply: 1.65 V ~ 3.7 V
  • Current - Supply: 105µA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 12-UFBGA, WLCSP
  • Supplier Device Package: 12-WLCSP (2x1.5)
Package: 12-UFBGA, WLCSP
Stock301
12 b
SPI
Internal
1.65 V ~ 3.7 V
105µA
-40°C ~ 85°C
Surface Mount
12-UFBGA, WLCSP
12-WLCSP (2x1.5)
AR1011-I/ML
Microchip Technology

IC CTLR TOUCH SENSE 20QFN

  • Touchscreen: 4, 5, or 8 Wire Resistive
  • Resolution (Bits): 10 b
  • Interface: UART
  • Voltage Reference: -
  • Voltage - Supply: 2.5 V ~ 5 V
  • Current - Supply: 17mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-VFQFN Exposed Pad
  • Supplier Device Package: 20-QFN (4x4)
Package: 20-VFQFN Exposed Pad
Stock345
10 b
UART
-
2.5 V ~ 5 V
17mA
-40°C ~ 85°C
Surface Mount
20-VFQFN Exposed Pad
20-QFN (4x4)
AD7879WACPZ-R5
Analog Devices Inc.

TOUCH SCREEN CONTROLLER

  • Touchscreen: 4 Wire Resistive
  • Resolution (Bits): 12 b
  • Interface: SPI
  • Voltage Reference: External
  • Voltage - Supply: 1.6 V ~ 3.6 V
  • Current - Supply: -
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 16-VQFN Exposed Pad, CSP
  • Supplier Device Package: 16-LFCSP-VQ (4x4)
Package: 16-VQFN Exposed Pad, CSP
Stock349
12 b
SPI
External
1.6 V ~ 3.6 V
-
-40°C ~ 85°C
Surface Mount
16-VQFN Exposed Pad, CSP
16-LFCSP-VQ (4x4)
CYTMA445-44LQI33AA
Cypress Semiconductor Corp

IC SCREEN CNTRL 32BIT 44QFN

  • Touchscreen: 2 Wire Capacitive
  • Resolution (Bits): 32 b
  • Interface: I2C, SPI
  • Voltage Reference: -
  • Voltage - Supply: 1.71 V ~ 5.5 V
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: Surface Mount
  • Package / Case: 44-UFQFN Exposed Pad
  • Supplier Device Package: 44-QFN (5x5)
Package: 44-UFQFN Exposed Pad
Stock969
32 b
I2C, SPI
-
1.71 V ~ 5.5 V
-
-
Surface Mount
44-UFQFN Exposed Pad
44-QFN (5x5)
AR1011T-I/SS
Microchip Technology

IC CTRLR TOUCH SENSE 20SSOP

  • Touchscreen: 4, 5, or 8 Wire Resistive
  • Resolution (Bits): 10 b
  • Interface: UART
  • Voltage Reference: -
  • Voltage - Supply: 2.5 V ~ 5 V
  • Current - Supply: 17mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-SSOP (0.209", 5.30mm Width)
  • Supplier Device Package: 20-SSOP
Package: 20-SSOP (0.209", 5.30mm Width)
Stock2,583
10 b
UART
-
2.5 V ~ 5 V
17mA
-40°C ~ 85°C
Surface Mount
20-SSOP (0.209", 5.30mm Width)
20-SSOP
AR1020-I/ML
Microchip Technology

IC TOUCH SCREEN CTRLR 20-QFN

  • Touchscreen: 4, 5, or 8 Wire Resistive
  • Resolution (Bits): 10 b
  • Interface: I2C, Serial, SPI
  • Voltage Reference: -
  • Voltage - Supply: 2.5 V ~ 5 V
  • Current - Supply: 17mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-VFQFN Exposed Pad
  • Supplier Device Package: 20-QFN-EP (4x4)
Package: 20-VFQFN Exposed Pad
Stock589
10 b
I2C, Serial, SPI
-
2.5 V ~ 5 V
17mA
-40°C ~ 85°C
Surface Mount
20-VFQFN Exposed Pad
20-QFN-EP (4x4)
AR1100-I/SO
Microchip Technology

IC TOUCH SCREEN CTRLR 20-SOIC

  • Touchscreen: 4, 5, or 8 Wire Resistive
  • Resolution (Bits): 10, 12 b
  • Interface: Serial, UART, USB
  • Voltage Reference: Internal
  • Voltage - Supply: 3.3 V ~ 5 V
  • Current - Supply: 25mA
  • Operating Temperature: -40°C ~ 85°C
  • Mounting Type: Surface Mount
  • Package / Case: 20-SOIC (0.295", 7.50mm Width)
  • Supplier Device Package: 20-SOIC
Package: 20-SOIC (0.295", 7.50mm Width)
Stock2,255
10, 12 b
Serial, UART, USB
Internal
3.3 V ~ 5 V
25mA
-40°C ~ 85°C
Surface Mount
20-SOIC (0.295", 7.50mm Width)
20-SOIC
CP7994AT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH 84BGA

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock260
-
-
-
-
-
-
-
-
-
CS8763AMT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH 56QFN

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock183
-
-
-
-
-
-
-
-
-
CP8407ATT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH 48QFN

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock310
-
-
-
-
-
-
-
-
-
CP8334ATT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock316
-
-
-
-
-
-
-
-
-
CP8140BTT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock188
-
-
-
-
-
-
-
-
-
CP8387AT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock313
-
-
-
-
-
-
-
-
-
CP8367AT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock424
-
-
-
-
-
-
-
-
-
CP7862AT
Cypress Semiconductor Corp

IC SCREEN CNTRL TRUETOUCH 84BGA

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock297
-
-
-
-
-
-
-
-
-
CG8520AA
Cypress Semiconductor Corp

IC SCREEN CNTRL PSOC 70BGA

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock479
-
-
-
-
-
-
-
-
-
CG8524AA
Cypress Semiconductor Corp

IC SCREEN CNTRL PSOC 48QFN

  • Touchscreen: -
  • Resolution (Bits): -
  • Interface: -
  • Voltage Reference: -
  • Voltage - Supply: -
  • Current - Supply: -
  • Operating Temperature: -
  • Mounting Type: -
  • Package / Case: -
  • Supplier Device Package: -
Package: -
Stock114
-
-
-
-
-
-
-
-
-