深圳市南天星电子科技有限公司 专业代理飞思卡尔 (Freescale) 飞思卡尔主要产品 8 位微控制器 16 位微控制器 数字信号处理器与控制器 i.MX 应用处理器 基于 ARM®技术的 Kinetis MCU 32/64 位微控制器与处理器 模拟与电源管理器件 射频器件（LDMOS，收发器） 传感器（压力，加速度，磁场， 触摸，电池） 飞思卡尔产品主要应用 汽车电子 数据连接 消费电子 工业控制 医疗保健 电机控制 网络 智能能源 深圳市南天星电子科技有限公司 电话：0755－83040796 传真：0755－83040790 邮箱：[email protected] 网址：www.soustar.com.cn 地址：深圳市福田区福明路雷圳大厦 2306 室 Freescale Semiconductor Technical Data MPR121 Rev 0, 9/2009 Advanced Information Proximity Capacitive Touch Sensor Controller MPR121 MPR121 OVERVIEW Capacitive Touch Sensor Controller 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 include an increased electrode count, a hardware configurable I2C address, an expanded filtering system with debounce, and completely independent electrodes with auto-configuration built in. The device also features a 13th simulated electrode that represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel or touch screen array. Bottom View 20-PIN QFN CASE 2059-01 Features ELE8 ELE9 2 14 ELE6 SDA 3 13 ELE5 ADDR 4 12 ELE4 VREG 5 11 ELE3 Switch Replacements Touch Pads 6 7 8 9 10 ELE2 ELE7 SCL ELE1 15 ELE0 IRQ 1 Typical Applications • • • • • ELE10 20 19 18 17 16 Implementations • • ELE11 VDD Top View REXT • • • • 1.71 V to 3.6 V operation 29 μA supply current at 16 ms sample period 3 μA shutdown current 12 electrodes Continuous independent auto-calibration for each electrode input Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence I2C interface, with IRQ output to advise electrode status changes 3 mm x 3 mm x 0.65 mm 20 lead QFN package LED driver functionality with 8 shared LEDs -40°C to +85°C operating temperature range VSS • • • • • • Pin Connections PC Peripherals MP3 Players Remote Controls Mobile Phones Lighting Controls ORDERING INFORMATION Device Name Temperature Range Case Number Touch Pads IRC Address Shipping MPR121QR2 -40°C to +85°C 2059 (20-Pin QFN) 12-pads 0x4C - 0x4F Tape & Reel This document contains a product under development. Freescale Semiconductor reserves the right to change or discontinue this product without notice. © Freescale Semiconductor, Inc., 2009. All rights reserved. SCHEMATIC DRAWINGS AND IMPLEMENTATION VDD 1.71 V to 2.75 V VDD 1.71 V to 2.75 V 0.1 μF 20 6 5 1 2 3 4 7 VDD ELE11/LED7 VSS ELE10/LED6 VREG ELE9/LED5 IRQ ELE8/LED4 SCL ELE7/LED3 SDA ELE6/LED2 ADDR ELE5/LED1 REXT ELE4/LED0 ELE3 ELE2 75 k 1% ELE1 GND ELE0 GND 19 18 17 16 15 14 13 12 11 10 9 8 MPR121Q TOUCH SENSOR Figure 1. Configuration 1: MPR121 runs from a 1.71 V to 2.75 V supply. VDD 2.5 V to 3.6 V VDD 2.5 V to 3.6 V 0.1 μF 20 6 5 1 2 3 4 7 VDD ELE11/LED7 VSS ELE10/LED6 VREG ELE9/LED5 IRQ ELE8/LED4 SCL ELE7/LED3 SDA ELE6/LED2 ADDR ELE5/LED1 REXT ELE4/LED0 ELE3 0.1 μF 75 k 1% ELE2 ELE1 GND GND ELE0 GND 19 18 17 16 15 14 13 12 11 10 9 8 MPR121Q TOUCH SENSOR Figure 2. Configuration 2: MPR121 runs from a 2.5 V to 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 10 pF to 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. To make setup of the device easier, an automatic configuration system can be used to set the ideal capacitance of each electrode. For information on how to set up this system refer to application note AN3889. Once capacitance is calculated, it runs through a couple of levels of digital filtering allowing for good noise immunity in different environments without sacrificing response time or power consumption. The MPR121 can be configured for sample rates between 1 ms and 128 ms. For information on how to set up this system refer to application note AN3890. MPR121 2 Sensors Freescale Semiconductor Touch Sensing Once the capacitance is determined at any given moment, this information must then be translated into intelligent touch recognition. The MPR121 has a couple of systems that have improved over the previous generation in the MPR03x series devices. A baseline tracking system allows the system to track the untouched capacitance in the system. For information on how to set up the baseline capacitance system refer to application note AN3891. The baseline value is then compared with the current value to determine if a touch has occurred. A designer has the ability to set both the rising and falling thresholds in addition to a debounce to eliminate jitter and false touches due to noise. 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 be measured. When enabled, this “13th” electrode will be included at the end of a normal detection cycle and will have its own independent set of configuration registers. This system is described in application note AN3893. LED Driver The MPR121 includes eight shared LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs. The system allows for both pull up and pull down LED configurations as well as general GPIO push/pull functionality. The configuration of the LED driver system is described in application note AN3894. Serial Communication The MPR121 is an Inter-Integrated Circuit (I2C) compliant device with an additional interrupt that is triggered any time a touch or release of a button is detected. The device has a configurable I2C address by connecting the ADDR pin to the VDD, VSS, SDA or SCL lines. The resulting I2C addresses are 0x4C, 0x4D, 0x4E and 0x4F respectively. The specific details of this system are described in AN3895. For reference the register map of the MPR121 is included in Table 1. MPR121 3 Sensors Freescale Semiconductor Table 1. Register Map REGISTER Fields ELE0 - ELE7 Touch Status ELE7 ELE6 ELE8 - ELE11, ELEPROX Touch Status OVCF ELEPROX ELE0-7 OOR Status ELE7 ELE6 ELE8-11, ELEPROX OOR Status ARFF ACFF ELE0 Electrode Filtered Data LSB ELE5 ELE5 ELE4 ELE3 ELE2 ELE1 ELE0 0x00 0x00 ELE10 ELE9 ELE8 0x01 0x00 ELE4 ELE3 ELE2 ELE1 ELE0 0x02 0x00 ELEPROX ELE11 ELE10 ELE9 ELE8 0x03 0x00 0x04 0x00 0x05 0x00 0x06 0x00 0x07 0x00 0x08 0x00 0x09 0x00 0x0A 0x00 0x0B 0x00 0x0C 0x00 0x0D 0x00 0x0E 0x00 0x0F 0x00 0x10 0x00 0x11 0x00 0x12 0x00 0x13 0x00 0x14 0x00 0x15 0x00 0x16 0x00 0x17 0x00 0x18 0x00 0x19 0x00 0x1A 0x00 0x1B 0x00 0x1C 0x00 0x1D 0x00 EFD0LB EFD0HB EFD1LB ELE1 Electrode Filtered Data MSB ELE2 Electrode Filtered Data LSB EFD1HB EFD2LB ELE2 Electrode Filtered Data MSB ELE3 Electrode Filtered Data LSB EFD2HB EFD3LB ELE3 Electrode Filtered Data MSB ELE4 Electrode Filtered Data LSB EFD3HB EFD4LB ELE4 Electrode Filtered Data MSB ELE5 Electrode Filtered Data LSB EFD4HB EFD5LB ELE5 Electrode Filtered Data MSB ELE6 Electrode Filtered Data LSB EFD5HB EFD6LB ELE6 Electrode Filtered Data MSB ELE7 Electrode Filtered Data LSB EFD6HB EFD7LB ELE7 Electrode Filtered Data MSB ELE8 Electrode Filtered Data LSB EFD7HB EFD8LB ELE8 Electrode Filtered Data MSB ELE9 Electrode Filtered Data LSB EFD8HB EFD9LB ELE9 Electrode Filtered Data MSB ELE10 Electrode Filtered Data LSB EFD9HB EFD10LB ELE10 Electrode Filtered Data MSB ELE11 Electrode Filtered Data LSB EFD10HB EFD11LB ELE11 Electrode Filtered Data MSB ELEPROX Electrode Filtered Data LSB Initial Value ELE11 ELE0 Electrode Filtered Data MSB ELE1 Electrode Filtered Data LSB Register Address EFD11HB EFDPROXLB ELEPROX Electrode Filtered Data MSB EFDPROXHB ELE0 Baseline Value E0BV 0x1E 0x00 ELE1 Baseline Value E1BV 0x1F 0x00 ELE2 Baseline Value E2BV 0x20 0x00 ELE3 Baseline Value E3BV 0x21 0x00 ELE4 Baseline Value E4BV 0x22 0x00 ELE5 Baseline Value E5BV 0x23 0x00 ELE6 Baseline Value E6BV 0x24 0x00 ELE7 Baseline Value E7BV 0x25 0x00 ELE8 Baseline Value E8BV 0x26 0x00 ELE9 Baseline Value E9BV 0x27 0x00 ELE10 Baseline Value E10BV 0x28 0x00 ELE11 Baseline Value E11BV 0x29 0x00 ELEPROX Baseline Value 0x2A 0x00 MHD Rising EPROXBV MHDR 0x2B 0x00 NHD Amount Rising NHDR 0x2C 0x00 0x2D 0x00 NCL Rising NCLR FDL Rising FDLR 0x2E 0x00 MHD Falling MHDF 0x2F 0x00 NHD Amount Falling NHDF 0x30 0x00 Auto Increment Address Register Address + 1 MPR121 4 Sensors Freescale Semiconductor Table 1. Register Map Fields Register Address Initial Value NCL Falling NCLF 0x31 0x00 FDL Falling FDLF 0x32 0x00 0x33 0x00 REGISTER NHD Amount Touched NHDT NCL Touched NCLT 0x34 0x00 FDL Touched FDLT 0x35 0x00 ELEPROX MHD Rising MHDPROXR 0x36 0x00 ELEPROX NHD Amount Rising NHDPROXR 0x37 0x00 ELEPROX NCL Rising NCLPROXR 0x38 0x00 ELEPROX FDL Rising FDLPROXR 0x39 0x00 ELEPROX MHD Falling MHDPROXF 0x3A 0x00 ELEPROX NHD Amount Falling NHDPROXF 0x3B 0x00 ELEPROX NCL Falling NCLPROXF 0x3C 0x00 ELEPROX FDL Falling FDLPROXF 0x3D 0x00 ELEPROX NHD Amount Touched 0x3E 0x00 ELEPROX NCL Touched NCLPROXT NHDPROXT 0x3F 0x00 ELEPROX FDL Touched FDLPROXT 0x40 0x00 ELE0 Touch Threshold E0TTH 0x41 0x00 ELE0 Release Threshold E0RTH 0x42 0x00 ELE1 Touch Threshold E1TTH 0x43 0x00 ELE1 Release Threshold E1RTH 0x44 0x00 ELE2 Touch Threshold E2TTH 0x45 0x00 ELE2 Release Threshold E2RTH 0x46 0x00 ELE3 Touch Threshold E3TTH 0x47 0x00 ELE3 Release Threshold E3RTH 0x48 0x00 ELE4 Touch Threshold E4TTH 0x49 0x00 ELE4 Release Threshold E4RTH 0x4A 0x00 ELE5 Touch Threshold E5TTH 0x4B 0x00 ELE5 Release Threshold E5RTH 0x4C 0x00 ELE6 Touch Threshold E6TTH 0x4D 0x00 ELE6 Release Threshold E6RTH 0x4E 0x00 ELE7 Touch Threshold E7TTH 0x4F 0x00 ELE7 Release Threshold E7RTH 0x50 0x00 ELE8 Touch Threshold E8TTH 0x51 0x00 ELE8 Release Threshold E8RTH 0x52 0x00 ELE9 Touch Threshold E9TTH 0x53 0x00 ELE9 Release Threshold E9RTH 0x54 0x00 ELE10 Touch Threshold E10TTH 0x55 0x00 ELE10 Release Threshold E10RTH 0x56 0x00 ELE11 Touch Threshold E11TTH 0x57 0x00 ELE11 Release Threshold E11RTH 0x58 0x00 EPROXTTH 0x59 0x00 0x5A 0x00 0x5B 0x00 0x5C 0x10 0x5D 0x04 ELEPROX Touch Threshold ELEPROX Release Threshold EPROXRTH Debounce Touch & Release AFE Configuration DR FFI Filter Configuration Electrode Configuration DT CDC CDT CL SFI ESI 0x5E 0x00 ELE0 Electrode Current EL CDC0 EleEn 0x5F 0x00 ELE1 Electrode Current CDC1 0x60 0x00 ELE2 Electrode Current CDC2 0x61 0x00 Auto Increment Address Register Address + 1 MPR121 Sensors Freescale Semiconductor 5 Table 1. Register Map REGISTER Fields ELE3 Electrode Current CDC3 Register Address Initial Value 0x62 0x00 ELE4 Electrode Current CDC4 0x63 0x00 ELE5 Electrode Current CDC5 0x64 0x00 ELE6 Electrode Current CDC6 0x65 0x00 ELE7 Electrode Current CDC7 0x66 0x00 ELE8 Electrode Current CDC8 0x67 0x00 ELE9 Electrode Current CDC9 0x68 0x00 ELE10 Electrode Current CDC10 0x69 0x00 ELE11 Electrode Current CDC11 0x6A 0x00 ELEPROX Electrode Current 0x6B 0x00 ELE0, ELE1 Charge Time CDT1 CDCPROX CDT0 0x6C 0x00 ELE2, ELE3 Charge Time CDT3 CDT2 0x6D 0x00 ELE4, ELE5 Charge Time CDT5 CDT4 0x6E 0x00 ELE6, ELE7 Charge Time CDT7 CDT6 0x6F 0x00 ELE8, ELE9 Charge Time CDT9 CDT8 0x70 0x00 ELE10, ELE11 Charge Time CDT11 CDT10 0x71 0x00 CDTPROX 0x72 0x00 ELEPROX Charge Time GPIO Control Register 0 CTL011 CTL010 CTL09 CTL08 CTL07 CTL06 CTL05 CTL04 0x73 0x00 GPIO Control Register 1 CTL111 CTL110 CTL19 CTL18 CTL17 CTL16 CTL15 CTL14 0x74 0x00 GPIO Data Register DAT11 DAT10 DAT9 DAT8 DAT7 DAT6 DAT5 DAT4 30x75 0x00 GPIO Direction Register DIR11 DIR10 DIR9 DIR8 DIR7 DIR6 DIR5 DIR4 0x76 0x00 GPIO Enable Register EN11 EN10 EN9 EN8 EN7 EN6 EN5 EN4 0x77 0x00 GPIO Data Set Register SET11 SET10 SET9 SET8 SET7 SET6 SET5 SET4 0x78 0x00 GPIO Data Clear Register CLR11 CLR10 CLR9 CLR8 7CLR7 CLR6 CLR5 CLR4 0x79 0x00 GPIO Data Toggle Register TOG11 TOG10 TOG9 TOG8 TOG7 TOG6 TOG5 TOG4 0x7A 0x00 ARE ACE 0x7B 0x00 OORIE ARFIE ACFIE 0x7C 0x00 AUTO-CONFIG Control Register 0 AUTO-CONFIG Control Register 1 AFES RETRY BVA SCTS AUTO-CONFIG USL Register USL 0x7D 0x00 AUTO-CONFIG LSL Register LSL 0x7E 0x00 TL 0x7F 0x00 AUTO-CONFIG Target Level Register Auto Increment Address Register Address + 1 0x00 MPR121 6 Sensors Freescale Semiconductor ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Absolute maximum ratings are stress ratings only, and functional operation at the maxima is not guaranteed. Stress beyond the limits specified in Table 2 may affect device reliability or cause permanent damage to the device. For functional operating conditions, refer to the remaining tables in this section. This device contains circuitry protecting against damage due to high static voltage or electrical fields; however, it is advised that normal precautions be taken to avoid application of any voltages higher than maximum-rated voltages to this high-impedance circuit. Table 2. Absolute Maximum Ratings - Voltage (with respect to VSS) Rating Symbol Value Unit Supply Voltage VDD -0.3 to +3.6 V Supply Voltage VREG -0.3 to +2.75 V VIN VSS - 0.3 to VDD + 0.3 V TO -40 to +85 °C GPIO Source Current per Pin iGPIO 12 mA GPIO Sink Current per Pin iGPIO 1.2 mA TS -40 to +125 °C Input Voltage SCL, SDA, IRQ Operating Temperature Range Storage Temperature Range ESD AND LATCH-UP PROTECTION CHARACTERISTICS Normal handling precautions should be used to avoid exposure to static discharge. Qualification tests are performed to ensure that these devices can withstand exposure to reasonable levels of static without suffering any permanent damage. During the device qualification ESD stresses were performed for the Human Body Model (HBM), the Machine Model (MM) and the Charge Device Model (CDM). A device is defined as a failure if after exposure to ESD pulses the device no longer meets the device specification. Complete DC parametric and functional testing is performed per the applicable device specification at room temperature followed by hot temperature, unless specified otherwise in the device specification. Table 3. ESD and Latch-up Test Conditions Rating Symbol Value Unit Human Body Model (HBM) VESD ±2000 V Machine Model (MM) VESD ±200 V Charge Device Model (CDM) VESD ±500 V Latch-up current at TA = 85°C ILATCH ±100 mA MPR121 Sensors Freescale Semiconductor 7 DC CHARACTERISTICS This section includes information about power supply requirements and I/O pin characteristics. Table 4. DC Characteristics (Typical Operating Circuit, VDD and VREG = 1.8 V, TA = 25°C, unless otherwise noted.) Min Typ Max High Supply Voltage Parameter Symbol VDD Conditions 2.5 3.3 3.6 Units V Low Supply Voltage VREG 1.71 1.8 2.75 V Average Supply Current IDD Run1 Mode @ 1 ms sample period 393 μA Average Supply Current IDD Run1 Mode @ 2 ms sample period 199 μA Average Supply Current IDD Run1 Mode @ 4 ms sample period 102 μA Average Supply Current IDD Run1 Mode @ 8 ms sample period 54 μA Average Supply Current IDD Run1 Mode @ 16 ms sample period 29 μA Average Supply Current IDD Run1 Mode @ 32 ms sample period 17 μA Average Supply Current IDD Run1 Mode @ 64 ms sample period 11 μA Average Supply Current IDD Run1 Mode @ 128 ms sample period 8 μA Measurement Supply Current IDD Peak of measurement duty cycle 1 mA Idle Supply Current IDD Stop Mode 3 μA IIH, IIL Input Leakage Current ELE_ 0.025 Input Capacitance ELE_ μA 15 Input High Voltage SDA, SCL 0.7 x VDD VIH Input Low Voltage SDA, SCL V VIL IIH, IIL Input Leakage Current SDA, SCL 0.025 Input Capacitance SDA, SCL Output Low Voltage SDA, IRQ VOL IOL = 6mA Output High Voltage ELE4 - ELE11 (GPIO mode) VOHGPIO VDD = 2.7 V to 3.6 V: IOHGPIO = -10 mA VDD = 2.3 V to 2.7 V: IOHGPIO = -6 mA VDD = 1.8 V to 2.3 V: IOHGPIO = -3 mA Output Low Voltage ELE4 - ELE11 (GPIO mode) VOLGPIO IOLGPIOD = 1 mA Power On Reset pF 0.3 x VDD V 1 μA 7 pF 0.5V V VDD - 0.5 V 0.5 V VTLH VDD rising 1.08 1.35 1.62 V VTHL VDD falling 0.88 1.15 1.42 V Min Typ Max Units AC CHARACTERISTICS Table 5. AC CHARACTERISTICS (Typical Operating Circuit, VDD and VREG = 1.8 V, TA = 25°C, unless otherwise noted.) Parameter Symbol Conditions 8 MHz Internal Oscillator fH 7.44 8 8.56 MHz 1 kHz Internal Oscillator fL 0.65 1 1.35 kHz MPR121 8 Sensors Freescale Semiconductor I2C AC CHARACTERISTICS Table 6. I2C AC Characteristics (Typical Operating Circuit, VDD and VREG = 1.8 V, TA = 25°C, unless otherwise noted.) Parameter Symbol Conditions Min Typ Max Units 400 kHz Serial Clock Frequency fSCL Bus Free Time Between a STOP and a START Condition tBUF 1.3 μs Hold Time, (Repeated) START Condition tHD, STA 0.6 μs Repeated START Condition Setup Time tSU, STA 0.6 μs STOP Condition Setup Time tSU, STO 0.6 μs Data Hold Time tHD, DAT Data Setup Time tSU, DAT 100 ns SCL Clock Low Period tLOW 1.3 μs SCL Clock High Period tHIGH 0.7 μs 0.9 μs Rise Time of Both SDA and SCL Signals, Receiving tR 20+0.1Cb 300 ns Fall Time of Both SDA and SCL Signals, Receiving tF 20+0.1Cb 300 ns tF.TX 20+0.1Cb 250 ns Pulse Width of Spike Suppressed tSP 25 Capacitive Load for Each Bus Line Cb Fall Time of SDA Transmitting ns 400 pF MPR121 Sensors Freescale Semiconductor 9 PACKAGE DIMENSIONS PAGE 1 OF 3 MPR121 10 Sensors Freescale Semiconductor PAGE 2 OF 3 MPR121 Sensors Freescale Semiconductor 11 PACKAGE DIMENSIONS PAGE 3 OF 3 MPR121 12 Sensors Freescale Semiconductor How to Reach Us: Home Page: www.freescale.com Web Support: http://www.freescale.com/support USA/Europe or Locations Not Listed: Freescale Semiconductor, Inc. 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Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2009. All rights reserved. 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, go to http://www.freescale.com/epp. MPR121 Rev. 0 9/2009