MPR121 FREESCALE [Freescale Semiconductor, Inc], MPR121 Datasheet
MPR121
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MPR121 Summary of contents
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... Proximity Capacitive Touch Sensor Controller MPR121 OVERVIEW The MPR121 is the second generation sensor controller after the initial release of the MPR03x series devices. The MPR121 will feature increased internal intelligence in addition to Freescale’s second generation capacitance detection engine. Some of the major additions ...
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... Figure 2. Configuration 2: MPR121 runs from a 2 3.6 V supply. Capacitance Sensing The MPR121 uses a constant current touch sensor system with two primary types of control. It can measure capacitances ranging from 2000 pF by varying the current and the amount of time supplied to each electrode. The electrodes are controlled independently allowing for a great deal of flexibility in electrode pattern design ...
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... These elements are described in application note AN3892. Proximity Sensing A new feature of the MPR121 is the use of a proximity sensing system whereby all of a system’s electrodes can be shorted together internally and create a single large electrode. The capacitance of this electrode is larger and projected capacitance can th be measured. When enabled, this “ ...
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... ELE7 Baseline Value ELE8 Baseline Value ELE9 Baseline Value ELE10 Baseline Value ELE11 Baseline Value ELEPROX Baseline Value MHD Rising NHD Amount Rising NCL Rising FDL Rising MHD Falling NHD Amount Falling MPR121 4 Fields ELE6 ELE5 ELE4 ELE3 ELEPROX ELE11 ELE10 ELE6 ELE5 ...
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... DT 0x5B 0x00 0x5C 0x10 ESI 0x5D 0x04 EleEn 0x5E 0x00 0x5F 0x00 0x60 0x00 0x61 0x00 MPR121 Auto 5 ...
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... SET11 GPIO Data Clear Register CLR11 GPIO Data Toggle Register TOG11 AUTO-CONFIG Control Register 0 AFES AUTO-CONFIG Control Register 1 SCTS AUTO-CONFIG USL Register AUTO-CONFIG LSL Register AUTO-CONFIG Target Level Register MPR121 6 Fields CDC3 CDC4 CDC5 CDC6 CDC7 CDC8 CDC9 CDC10 CDC11 CDCPROX ...
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... Latch-up current 85°C A Sensors Freescale Semiconductor ) SS Symbol Value V -0 -0.3 to +2.75 REG 0 - GPIO i 1.2 GPIO T -40 to +125 S Symbol Value V ±2000 ESD V ±200 ESD V ±500 ESD I ±100 LATCH Unit 0.3 V ° °C Unit MPR121 7 ...
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... AC CHARACTERISTICS Table 5. AC CHARACTERISTICS (Typical Operating Circuit, V and V DD REG Parameter 8 MHz Internal Oscillator 1 kHz Internal Oscillator MPR121 25°C, unless otherwise noted.) A Conditions DD Run1 Mode @ 1 ms sample period Run1 Mode @ 2 ms sample period Run1 Mode @ 4 ms sample period Run1 Mode @ 8 ms sample period ...
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... SCL t BUF t HD, STA t SU, STA t SU, STO t HD, DAT t SU, DAT t LOW t HIGH F. Min Typ Max Units 400 kHz 1.3 μs 0.6 μs 0.6 μs 0.6 μs 0.9 μs 100 ns 1.3 μs 0.7 μs 20+0.1C 300 ns b 20+0.1C 300 ns b 20+0.1C 250 400 pF MPR121 9 ...
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... MPR121 10 PACKAGE DIMENSIONS PAGE Sensors Freescale Semiconductor ...
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... Sensors Freescale Semiconductor PAGE MPR121 11 ...
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... MPR121 12 PACKAGE DIMENSIONS PAGE Sensors Freescale Semiconductor ...
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... RoHS-compliant and/or Pb-free versions of Freescale products have the functionality and electrical characteristics of their non-RoHS-compliant and/or non-Pb-free counterparts. For further information, see http:/www.freescale.com or contact your Freescale sales representative. For information on Freescale’s Environmental Products program http://www.freescale.com/epp. MPR121 Rev. 0 9/2009 Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products ...