參數(shù)資料
型號： MPR121QR2
廠商： Freescale Semiconductor
文件頁數(shù)： 5/27頁
文件大?。?/td> 0K
描述： IC CTLR TOUCH SENSOR 20-QFN
產(chǎn)品培訓模塊： MPR121: Low-Power Touch Sensor
產(chǎn)品目錄繪圖： MPR121QR2CT
特色產(chǎn)品： MPR121 Proximity Capacitive Touch Sensor Controller
標準包裝： 1
類型： 電容式，近程傳感器
輸入數(shù)/鍵： 12 鍵
評估套件： 可供
數(shù)據(jù)接口： I²C，串行
電源電壓： 1.71 V ~ 3.6 V
電流 - 電源： 29µA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-UFQFN
供應(yīng)商設(shè)備封裝： 20-QFN（3x3）
包裝： 標準包裝
產(chǎn)品目錄頁面： 2808 (CN2011-ZH PDF)
其它名稱： MPR121QR2DKR
MPR121
Sensors
Freescale Semiconductor, Inc.
13
Noise Count Limit (NCL): Determines the number of samples consecutively greater than the Max Half Delta value. This is
necessary to determine that it is not noise. The range of the effective value is 0~255.
Filter Delay Count Limit (FDL): Determines the operation rate of the filter. A larger count limit means the filter delay is operating
more slowly. The range of the effective value is 0~255.
The setting of the filter is depended on the actual application. For more information on these registers, refer to application note
AN3891.
5.6
Touch / Release Threshold (0x41~0x5A)
ExTTH: Electrode touch threshold, in range of 0~0xFF.
ExRTH: Electrode release threshold, in range of 0~0xFF.
Each of the 13 channels can be set with its own set of touch and release thresholds. Touch and release are detected by
comparing the electrode filtered data to the baseline value. The amount of deviation from the baseline value represents a
immediate capacitance change detected by possible a touch/release action.
Touch condition: Baseline - Electrode filtered data > Touch threshold
Release condition: Baseline - Electrode filtered data < Release threshold
Threshold settings are dependant on the touch/release signal strength, system sensitivity and noise immunity requirements. In
a typical touch detection application, threshold is typically in the range 0x04~0x10. The touch threshold is several counts larger
than the release threshold. This is to provide hysteresis and to prevent noise and jitter. For more information, refer to the
application note AN3892 and the MPR121 design guidelines.
5.7
Debounce Register (0x5B)
DT: Debounce number for touch. The value range is 0~7.
DR: Debounce number for release. The value range is 0~7.
All 13 channels use the same set of touch and release debounce numbers. The status bits in Status Register 0x00 and 0x01 will
only take place after the number of consecutive touch or release detection meets the debounce number setting. The debounce
setting can be very useful in avoiding possible noise glitches. Using the debounce setting, the status bit change will have a delay
of {ESI x SFI x DR (or DT)}.
ELEx, ELEProx Touch Threshold (0x41,0x43,...,0x59)
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Read
ExTTH
Write
ELEx, ELEProx Release Threshold (0x42,0x44,...,0x5A)
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Read
ExRTH
Write
Debounce Register (0x5B)
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Read
—
DR
—
DT
Write
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MPR121QR2 制造商:Freescale Semiconductor 功能描述:IC CAPACITIVE TOUCH SENSOR CTRL QFN-20
MPR121QR2-CUT TAPE 制造商:Freescale 功能描述:MPR121 Series 3.6 V 29 ? Proximity Capacitive Touch Sensor Controller - QFN-20
MPR1487 制造商:MISC. COMMERCIAL HRD 功能描述:
MPR181EJ 功能描述:電容觸摸傳感器 8 POSITION TOUCH PAD RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍:
MPR181EJR2 功能描述:電容觸摸傳感器 8 POSITION TOUCH PAD RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍:
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