12키 멀티채널 정전식 I2C 터치 센서 -MPR121
(Grove - 12 Key Capacitive I2C Touch Sensor V2 (MPR121))
개요
- 본 제품은 12 키 멀티채널 정전식 I2C 터치 센서 모듈입니다.
- 정전식 터치, 터치, 근접 센싱의 세가지 기능을 하나의 모듈에서 사용이 가능한 제품입니다.
- MPR121 칩을 탑재하였으며, I2C 주소는 0X5Bㅇ서 0X5D까지 설정이 가능하여 동일 I2C 버스상에서 최대 36개의 터치 일렉트로드를 연결하여 사용이 가능합니다.
특징
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Capacitance Sensing: This module uses a constant DC current capacitance sensing scheme. It can measure capacitances ranging from 10 pF to over 2000 pF with a resolution up to 0.01 pF.
Touch Sensing: Once the electrode capacitance data is acquired, the electrode touch/release status is determined comparing it to the capacitance baseline value.
Proximity Sensing: One new feature of the MPR121 is the near proximity sensing system. This means that all of the system's electrodes can be summed together to create a single large electrode.
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Internal 10-bit ADC
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Integrated independent autocalibration for each electrode input
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Completely independent electrodes with built-in autoconfiguration
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I2C interface, with IRQ Interrupt output to advise electrode status changes
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Hardware configurable I2C address
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12 electrodes/capacitance sensing inputs in which 8 are multifunctional for LED driving and GPIO
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Autoconfiguration of charge current and charge time for each electrode input
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Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence