Interface - Sensor, Capacitive Touch

Category Introduction

Products in this family provide the analog stimulus and measurement resources needed to operate a capacitance-based touch sensing transducer, and communicate information generated thereby in a format convenient for use with a microcontroller or similar device, such as an I2C or SPI serial interface, UART, or a simple logic signal. They are commonly used for human interface applications.

Product List

574 Items

Mfr Part #	Quantity Available	UnitPrice	Series	Packaging	Product Status	Type	Proximity Detection	Number of Inputs	LED Driver Channels	Interface	Resolution	Voltage - Supply	Current - Supply	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
IQS550-BL-QNR 150CH. TRACKPAD/TOUCH SCREEN CON Azoteq (Pty) Ltd	254	$2.97	ProxSense®	Tape & Reel (TR)	Active	Buttons	Yes	150	-	I²C	8 b	1.65V ~ 3.6V	80mA	-40°C ~ 85°C	Surface Mount	48-UFQFN Exposed Pad	48-QFN (7x7)
FDC1004DSCR CAPACITIVE SENSING SOLUTIONS Texas Instruments	107	$7.34		Tape & Reel (TR)	Active	Proximity Only	Yes	4	-	I²C	16 b	3V ~ 3.6V	750µA	-40°C ~ 125°C	Surface Mount	10-WFDFN Exposed Pad	10-WSON (3x3)
FDC1004QDGSRQ1 IC CAPACITIVE SENSING 4CH 10VSSO Texas Instruments	18	$6.53	Automotive, AEC-Q100	Tape & Reel (TR)	Active	Proximity Detector	Yes	4	-	I²C	16 b	3V ~ 3.6V	750µA	-40°C ~ 125°C	Surface Mount	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	10-VSSOP
IQS228B-00000000-TSR CAPACITIVE TOUCH SENSOR Azoteq (Pty) Ltd	1,185	$0.80	ProxSense®	Tape & Reel (TR)	Active	Proximity Only	Yes	1	-	I²C	-	1.76V ~ 3.6V	6.45µA	-20°C ~ 85°C (TA)	Surface Mount	SOT-23-6 Thin, TSOT-23-6	TSOT-23-6
FDC2214RGHT IC CAPACITIVE SENSING 16WQFN Texas Instruments	27	$8.98		Tape & Reel (TR)	Active	Proximity Detector	Yes	4	-	I²C	28 b	± 2.7V ~ 3.6V	2.1mA	-40°C ~ 125°C	Surface Mount	16-WFQFN Exposed Pad	16-WQFN (4x4)
IQS525-BL-QNR 25CH. TRACKPAD/TOUCH SCREEN CONT Azoteq (Pty) Ltd	273	$2.39	ProxSense®	Tape & Reel (TR)	Active	Button	Yes	25	-	I²C	16 b	1.65V ~ 3.6V	80mA	-40°C ~ 85°C	Surface Mount	28-UFQFN	28-QFN (4x4)
FDC2112DNTT IC CAPACITIVE SENSING Texas Instruments	35	$8.64		Tape & Reel (TR)	Active	Proximity Only	Yes	2	-	I²C	12 b	2.7V ~ 3.6V	2.1mA	-40°C ~ 125°C	Surface Mount	12-WFDFN Exposed Pad	12-WSON (4x4)
FDC1004QDGSTQ1 CAPACITIVE SENSING SOLUTIONS Texas Instruments	80	$8.57	Automotive, AEC-Q100	Tape & Reel (TR)	Active	Proximity Detector	Yes	4	-	I²C	16 b	3V ~ 3.6V	750µA	-40°C ~ 125°C	Surface Mount	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	10-VSSOP
FDC2114RGHT IC CAPACITIVE SENSING Texas Instruments	38	$9.28		Tape & Reel (TR)	Active	Proximity Only	Yes	4	-	I²C	12 b	2.7V ~ 3.6V	2.1mA	-40°C ~ 125°C	Surface Mount	16-WFQFN Exposed Pad	16-WQFN (4x4)
AT42QT2640-AU IC TOUCH SENSOR 64KEY TQFP Microchip Technology	41	$10.83	QMatrix™	Tray	Active	Buttons, Slider, Wheel	No	Up to 64	-	SPI	11 b	4.75V ~ 5.25V	13mA	-40°C ~ 105°C	Surface Mount	44-TQFP	44-TQFP (10x10)
SCT1008CMT3R2G 1 TMP DIO MON/SMBUS 4CH onsemi	13	$0.29		Bulk	Active	-	-	-	-	-	-	-	-	-	-	-	-
IS31SE5118-ZNLS3-TR IC TOUCH BUTTONS 16TSSOP Lumissil Microsystems	136	$1.63		Tape & Reel (TR)	Active	Buttons	No	9	9	I²C	-	2.7V ~ 5.5V	-	-40°C ~ 105°C	Surface Mount	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP
IS31SE5111A-ZNLS3-TR IC TOUCH BUTTONS 24TSSOP Lumissil Microsystems	74	$2.32		Tape & Reel (TR)	Active	Buttons	No	15	15	I²C, SPI	-	2.7V ~ 5.5V	100µA	-40°C ~ 105°C	-	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
LC71F7001VB-0-TLM-H CAPACITIVE TOUCH SENSORS Sanyo	129	$1.78		Bulk	Active	-	-	-	-	-	-	-	-	-	Surface Mount	-	-
AT42QT2161-MMU PROXIMITY - TOUCH SENSOR, PQCC28 Atmel	432	$2.02	QMatrix™	Bulk	Obsolete	Buttons, Slider	No	Up to 16	11	I²C	10 b	1.8V ~ 5.5V	1.14mA	-40°C ~ 85°C	-	28-VFQFN Exposed Pad	28-VQFN (4x4)
LC71F7001VB-1-TLM-H CAPACITIVE TOUCH SENSORS Sanyo	434	$2.08		Bulk	Active	-	-	-	-	-	-	-	-	-	Surface Mount	-	-
LC71F7001VB-3-TLM-H CAPACITIVE TOUCH SENSORS Sanyo	209	$2.10		Bulk	Active	-	-	-	-	-	-	-	-	-	Surface Mount	-	-
LC71F7001VB-2-TLM-H CAPACITIVE TOUCH SENSORS Sanyo	43	$2.07		Bulk	Active	-	-	-	-	-	-	-	-	-	Surface Mount	-	-
MPR084EJR2 CONSUMER CIRCUIT, PDSO16 Freescale Semiconductor	323	$2.21		Bulk	Obsolete	Buttons, Slider, Wheel	Yes	8	-	I²C	-	1.8V ~ 3.6V	1.62mA	-40°C ~ 85°C	Surface Mount	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP
MPR083EJ CAPACITIVE SENSOR, SQUARE, SURFA Freescale Semiconductor	8	$2.24		Bulk	Active	Buttons, Slider, Wheel	Yes	8	-	I²C	-	1.8V ~ 3.6V	1.62mA	-40°C ~ 85°C	Surface Mount	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP

About Sensor, Capacitive Touch

What are Sensor, Capacitive Touch?

Sensor, Capacitive Touch

Capacitive touch sensors are a pivotal component in the realm of interface integrated circuits (ICs), enabling seamless interaction between humans and electronic devices. These sensors detect touch by measuring changes in capacitance, which occurs when a conductive object, such as a finger, approaches the sensor's surface. The basic operating principle involves an electric field generated by the sensor's electrodes. When a finger comes close, it alters the field, causing a change in capacitance that the sensor detects and processes into a touch command. This technology is renowned for its durability, responsiveness, and ability to support multi-touch functionality.

Types of Sensor, Capacitive Touch

1. Surface Capacitive Sensors

Surface capacitive sensors are commonly used in applications requiring a robust touch interface. They consist of a conductive layer on a glass panel, with electrodes at the corners. When a finger touches the screen, it draws a small amount of current, which is detected by the sensors at the corners. These sensors are known for their durability and are often used in public kiosks and ATMs.

2. Projected Capacitive Sensors

Projected capacitive sensors are widely used in smartphones and tablets due to their ability to support multi-touch gestures. They feature a grid of conductive wires layered between two sheets of glass. When a finger approaches, it changes the capacitance at the intersection of the grid lines, allowing for precise touch detection. These sensors offer high sensitivity and can function through protective glass layers.

3. Mutual Capacitive Sensors

Mutual capacitive sensors are designed for applications requiring high precision and accuracy. They use a matrix of rows and columns of electrodes, where each intersection acts as a capacitive sensor. The mutual capacitance between the electrodes changes when a finger is present, allowing for detailed touch mapping. These sensors are ideal for applications like drawing tablets and signature pads.

How to choose Sensor, Capacitive Touch?

When selecting a capacitive touch sensor, several key parameters should be considered:

Touch Sensitivity: Determine the required sensitivity level based on the application, whether it needs to detect light touches or withstand heavy use.
Multi-Touch Capability: Consider if the application requires multi-touch functionality, which is essential for devices like smartphones and tablets.
Environmental Resistance: Evaluate the sensor's ability to operate in various environmental conditions, such as humidity, temperature, and exposure to chemicals.
Durability: Assess the sensor's lifespan and resistance to wear and tear, especially for public or industrial applications.
Supplier Reliability: Research the reputation and reliability of suppliers, ensuring they provide quality products and support.

Installation requirements, such as the need for protective layers or specific mounting techniques, should also be considered to ensure optimal performance and longevity of the sensor.

Applications of Sensor, Capacitive Touch

1. Consumer Electronics

In the consumer electronics industry, capacitive touch sensors are integral to devices like smartphones, tablets, and laptops. They enable intuitive touch interfaces, allowing users to navigate, zoom, and interact with applications effortlessly.

2. Automotive Industry

Capacitive touch sensors are increasingly used in automotive applications, such as infotainment systems, navigation controls, and climate control panels. They provide a sleek, modern interface that enhances user experience and safety by minimizing distractions.

3. Industrial Automation

In industrial settings, capacitive touch sensors are employed in control panels and human-machine interfaces (HMIs). They offer reliable operation in harsh environments, improving efficiency and reducing the risk of mechanical failure.

4. Healthcare Devices

Healthcare devices, such as medical monitors and diagnostic equipment, utilize capacitive touch sensors for their ease of use and hygienic benefits. These sensors allow for easy cleaning and reduce the risk of contamination.

5. Home Appliances

Capacitive touch sensors are found in modern home appliances, including ovens, washing machines, and refrigerators. They provide a user-friendly interface, allowing for precise control of settings and functions.