MPR121 touch sensor features and advantages comparison

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/ 2019-06-26 / News


MPR121 is Freescale (current line has been RESURGENT acquisition of the second generation of low-power smart touch sensors, the principle is to detect changes in capacitance Determine if there is a touch (close). With higher internal intelligence and Freescale's second-generation capacitance detection engine, it has the ability to expand from low-cost simple buttons to complex touch applications. Key new features include increased electrode count for more reliable touch detection, hardware configurable I2C address, extended filtering system with debounce, and automatic configuration of internal parameters Fully independent electrode.

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In a dedicated low-power design, the MPR121 is a simple embedded device , or simply add software, customers can use the MCU in their system to switch to a touch-sensing interface. Freescale's touch-sensing solutions support a smooth interface design for a variety of consumer and industrial applications. With a wide range of solutions and products, customers can choose a product that meets their specific system requirements for power, software integration and contact.

Key Features:

1. Low power consumption, the MPR121 has a very low 29μA operation current and 3μA standby current, suitable for battery applications powered by battery

2. Intelligent configuration, MPR121 is equipped with automatic configuration and perfect filtering processing.All basic capacitive touch detection processing is integrated.

3. With proximity function, you can judge whether you are using or are using the terminal product by detecting whether the human body is close, thereby helping the system to solve whether to turn the power or some equipment on or off to save energy. the goal of.

4. Low cost, flexible and reliable. The ability to manage multiple user interface configurations provides greater flexibility and helps reduce overall system cost.

Product parameters:

● Supports up to 12 touch electrodes and proximity detection

● Operating voltage is 1.71V~3.6V

● Very low power with 29μA average supply current (12 electrodes at 62.5Hz sampling rate)

● Continuous, independent auto-calibration for each electrode

● Each electrode has independent contact and release trip threshold (reset hysteresis, each electrode is independent)

● The input/output logic of 8 electrodes can be combined arbitrarily.Can drive up to 8 LEDs

● Maximum shutdown current is 3μA

● I2Cinterface, using IRQ interrupt output to notify Electrode state change

● 3mm*3mm*0.6mm 20-pin QFN package

● Operating temperature: -40°C to +85°C

Typical applications for the MPR121 include touch buttons, touch sliders, proximity detection, grip detection, and more. Applicable product areas include mobile phones, smart door locks, access control, remote control, printers, home appliances, smart homes, smart toys and medical devices.


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