SX8661I07ZULTRT

SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX8661Z is an ultra low power, fully integrated 8-channel solution for capacitive touch-button and proximity detection applications. Unlike many capacitive touch solutions, the SX8661Z features dedicated capacitive sense inputs (that requires no external components) in addition to 8 general purpose I/O ports (GPIO). Each of the 8 on-chip GPIO/LED driver is equipped with independent PWM source for enhanced visual effect such as dimming, and breathing.  Complete 8 Sensors Capacitive Touch-Button Solution The SX8661Z includes a capacitive 10 bit ADC analog interface with automatic compensation up to 100pF. The high resolution capacitive sensing supports a wide variety of touch pad sizes and shapes and allows capacitive buttons to be created using thick overlay materials (up to 5mm) for an extremely robust and ESD immune system design. o Up to 8 LED Drivers for individual Visual Feedback with Auto Lightening o Configurable Single or Continuous Fading Mode o 256 steps PWM Linear and Logarithmic control  Proximity Sensing up to several centimetres  High Resolution Capacitive Sensing o Up to 100pF of Offset Cap. Compensation at Full Sensitivity o Capable of Sensing up thru 5mm thick Overlay Materials  Up to 2 Analog Output Interfaces (AOI-A and AOI-B) o Enable button detection thru host’s ADC  Support of buzzer for audible feedback  User-selectable Button Reporting Configuration o Report Single or Report Strongest  Extremely Low Power o 8uA (typ) in Sleep Mode The SX8661Z incorporates a versatile firmware that was specially designed to simplify capacitive touch solution design and offers reduced time-to-market. Integrated multi-time programmable memory provides the ultimate flexibility to modify key firmware parameters (gain, threshold, scan period, auto offset compensation) in the field without the need for new firmware development. o 70uA (typ) in Doze Mode (195ms) o 200uA (typ) in Active Mode (30ms)  Programmable Scanning Period from 15ms to several seconds  Auto Offset Compensation o Eliminates false triggers due to environmental factors (temperature, humidity) o Initiated on power-up and configurable intervals  Multi-Time In-Field Programmable Firmware Parameters The SX8661Z supports the 400 kHz I²C serial bus data protocol and includes a field programmable slave address. The tiny 4mm x 4mm footprint makes it an ideal solution for portable, battery powered applications where power and density are at a premium. for Ultimate Flexibility o On-chip user programmable memory for fast, self contained start-up  No External Components per Sensor Input  Internal Clock Requires No External Components  Differential Sensor Sampling for Reduced EMI TYPICAL APPLICATION CIRCUIT  Optional 400 KHz I²C Interface with Programmable Address mother board Analog Output Interface  -40°C to +85°C Operation cap2 gpo6 SX8661Z cap0 cap1 gpo7 vdig gnd resetb vana pr ox im ity APPLICATIONS analog sensor interface PWM LED controller clock generation RC d6  LCD TVs, Monitors  White Goods gnd gpo5 d5  Notebook/Netbook/Portable/Handheld computers  Consumer Products, Instrumentation, Automotive gpo4 d4 cap3 power management gpo3 cap4 cap5 cap6 cap7 micro processor GPIO controller gpo2 RAM NVM gpo1 ROM I2C gpo0 sda scl intb vdd cp d3 d2 gnd bottom plate cn  Mechanical Button Replacement ORDERING INFORMATION Part Number d1 Temperature Range d0 Package 1 SX8661I07ZULTRT -40°C to +85°C Lead Free MLPQ-UT28 1 3000 Units/reel * This device is RoHS/WEEE compliant and Halogen Free Revision v4.0, February 2016 © 2012 Semtech Corp. 1 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET Table of Contents GENERAL DESCRIPTION ........................................................................................................................ 1 TYPICAL APPLICATION CIRCUIT ............................................................................................................ 1 KEY PRODUCT FEATURES..................................................................................................................... 1 APPLICATIONS....................................................................................................................................... 1 ORDERING INFORMATION...................................................................................................................... 1 GENERAL DESCRIPTION............................................................................................................... 5 1 1.1 1.2 1.3 1.4 1.5 2 Pin Diagram Marking information Pin Description Simplified Block Diagram Acronyms 5 5 6 7 7 ELECTRICAL CHARACTERISTICS ................................................................................................. 8 2.1 2.2 2.3 2.4 3 Absolute Maximum Ratings Recommended Operating Conditions Thermal Characteristics Electrical Specifications 8 8 8 9 FUNCTIONAL DESCRIPTION ........................................................................................................ 12 3.1 Introduction 3.1.1 General 3.1.2 GPIOs 3.1.3 Analog Output Interface A and B (SPO mode) 3.1.4 Buzzer (SPO mode) 3.1.5 Parameters 3.1.6 Configuration 3.2 Scan Period 3.3 Operation modes 3.4 Sensors on the PCB 3.5 Button Information 3.6 Buzzer 3.7 Analog Output Interface 3.8 Analog Sensing Interface 3.9 Offset Compensation 3.10 Processing 3.11 Configuration 3.12 Power Management 3.13 Clock Circuitry 3.14 I2C interface 3.15 Interrupt 3.15.1 Power up 3.15.2 Assertion 3.15.3 Clearing Revision v4.0, February 2016 © 2012 Semtech Corp. 2 12 12 12 12 12 13 13 13 14 14 15 15 17 19 21 22 22 24 24 24 25 25 25 25 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 3.15.4 Example 3.16 Reset 3.16.1 Power up 3.16.2 RESETB 3.16.3 Software Reset 3.17 General Purpose Input and Outputs 3.17.1 GPP mode 3.17.2 GPO Dual Reporting 3.17.3 GPO Fading 3.17.4 Intensity index vs PWM pulse width 3.17.5 GPO Triple Reporting 4 DATASHEET 26 26 26 27 27 28 28 30 31 32 33 PIN DESCRIPTIONS ..................................................................................................................... 35 4.1 4.2 4.3 4.4 4.5 5 Introduction ASI pins Host interface pins Power management pins General purpose IO pins 35 35 36 39 40 DETAILED CONFIGURATION DESCRIPTIONS .............................................................................. 41 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6 Introduction General Parameters Capacitive Sensors Parameters Proximity Parameters Button Parameters Analog Output Interface Parameters Buzzer Parameters Mapping Parameters GPIO Parameters 41 44 45 49 51 57 59 60 62 I2C INTERFACE ........................................................................................................................... 66 6.1 6.2 6.3 6.4 6.5 6.6 I2C Write I2C read I2C Registers Overview Status Registers Control Registers SPM Gateway Registers 6.6.1 SPM Write Sequence 6.6.2 SPM Read Sequence 6.7 NVM burn 6.8 Monitor Mode 7 66 67 68 69 71 73 74 75 76 77 APPLICATION INFORMATION ...................................................................................................... 78 7.1 7.2 Triple proximity reporting Dual proximity reporting 7.2.1 SPM file (application two AOI, dual proximity reporting) 7.3 Example of Touch+Proximity Module 7.3.1 Overview 7.3.2 Operation 7.3.3 Performance 7.3.4 Schematics 7.3.5 Layout Revision v4.0, February 2016 © 2012 Semtech Corp. 3 78 79 81 82 82 82 83 83 84 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 8 REFERENCES ............................................................................................................................. 85 9 PACKAGING INFORMATION ........................................................................................................ 86 9.1 9.2 Package Outline Drawing Land Pattern Revision v4.0, February 2016 86 86 © 2012 Semtech Corp. 4 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 1 GENERAL DESCRIPTION cap4 4 cap5 5 cap6 6 cap7 7 vana resetb gnd vdig gpio7 gpio6 23 22 SX8661Z Top View bottom ground pad 8 9 10 11 12 13 14 gpio0 3 24 sda cap3 25 scl 2 26 intb cap2 27 vdd 1 28 cp cap1 cap0 Pin Diagram cn 1.1 21 gnd 20 gpio5 19 gpio4 18 gpio3 17 gpio2 16 gnd 15 gpio1 Figure 1 Pinout Diagram 1.2 Marking information ZRA3 yyww xxxxx R07 yyww = Date Code xxxxx = Semtech lot number R07 = Semtech Code Figure 2 Marking Information Revision v4.0, February 2016 © 2012 Semtech Corp. 5 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 1.3 DATASHEET Pin Description Number Name Type Description 1 CAP1 Analog Capacitive Sensor 1 2 CAP2 Analog Capacitive Sensor 2 3 CAP3 Analog Capacitive Sensor 3 4 CAP4 Analog Capacitive Sensor 4 5 CAP5 Analog Capacitive Sensor 5 6 CAP6 Analog Capacitive Sensor 6 7 CAP7 Analog Capacitive Sensor 7 8 CN Analog Integration Capacitor, negative terminal (1nF between CN and CP) 9 CP Analog Integration Capacitor, positive terminal (1nF between CN and CP) 10 VDD Power Main input power supply 11 INTB Digital Output Interrupt, active LOW, requires pull up resistor (in host or external) 12 SCL Digital Input I2C Clock, requires pull up resistor (in host or external) 13 SDA Digital Input/Output I2C Data, requires pull up resistor (in host or external) 14 GPIO0 Digital Input/Output General Purpose Input/Output 0 15 GPIO1 Digital Input/Output General Purpose Input/Output 1 16 GND Ground Ground 17 GPIO2 Digital Input/Output General Purpose Input/Output 2 18 GPIO3 Digital Input/Output General Purpose Input/Output 3 19 GPIO4 Digital Input/Output General Purpose Input/Output 4 20 GPIO5 Digital Input/Output General Purpose Input/Output 5 21 GND Ground Ground 22 GPIO6 Digital Input/Output General Purpose Input/Output 6 23 GPIO7 Digital Input/Output General Purpose Input/Output 7 24 VDIG Analog Digital Core Decoupling, connect to a 100nF decoupling capacitor 25 GND Ground Ground 26 RESETB Digital Input Active Low Reset. Connect to VDD if not used. 27 VANA Analog Analog Core Decoupling, connect to a 100nF decoupling capacitor 28 CAP0 Analog Capacitive Sensor 0 Ground Exposed pad connect to ground bottom plate GND Table 1 Pin description Revision v4.0, February 2016 © 2012 Semtech Corp. 6 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 1.4 DATASHEET Simplified Block Diagram cap2 gpo6 SX8661Z cap0 cap1 gpo7 vdig gnd vana resetb The simplified block diagram of the SX8661Z is illustrated in Figure 3. PWM LED controller clock generation RC analog sensor interface cap3 power management gnd gpo5 gpo4 gpo3 cap4 cap5 cap6 micro processor GPIO controller gpo2 RAM NVM gpo1 ROM I2C gnd gpo0 cap7 sda scl intb vdd cp cn bottom plate Figure 3 Simplified block diagram of the SX8661Z 1.5 AOI ASI DCV GPO GPP MTP NVM PWM QSM SPM SPO Acronyms Analog Output Interface Analog Sensor Interface Digital Compensation Value General Purpose Output General Purpose PWM Multiple Time Programmable Non Volatile Memory Pulse Width Modulation Quick Start Memory Shadow Parameter Memory Special Purpose Output Revision v4.0, February 2016 © 2012 Semtech Corp. 7 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 2 ELECTRICAL CHARACTERISTICS 2.1 Absolute Maximum Ratings Stresses above the values listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these, or any other conditions beyond the “Recommended Operating Conditions”, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameter Symbol Min. Max. Unit Supply Voltage VDD -0.5 3.9 V Input voltage (non-supply pins) VIN -0.5 3.9 V Input current (non-supply pins) IIN 10 mA Operating Junction Temperature TJCT 125 °C Reflow temperature TRE 260 °C Storage temperature TSTOR -50 150 °C ESDHBM 3 kV ILU ± 100 mA (i) ESD HBM (Human Body model) Latchup (ii) Table 2 Absolute Maximum Ratings (i) Tested to JEDEC standard JESD22-A114 (ii) Tested to JEDEC standard JESD78 2.2 Recommended Operating Conditions Parameter Symbol Min. Max. Unit Supply Voltage VDD 2.7 3.6 V 100 mV Supply Voltage Drop (iii, iv, v) VDDdrop Supply Voltage for NVM programming VDD 3.6 3.7 V Ambient Temperature Range TA -40 85 °C Table 3 Recommended Operating Conditions (iii) Performance for 2.6V < VDD < 2.7V might be degraded. (iv) Operation is not guaranteed below 2.6V. Should VDD briefly drop below this minimum value, then the SX8661Z may require; - a hardware reset issued by the host using the RESETB pin - a software reset issued by the host using the I2C interface (v) In the event the host processor is reset or undergoes a power OFF/ON cycle, it is recommended that the host also resets the SX8661Z and assures that parameters are re-written into the SPM (should these differ to the parameters held in NVM). 2.3 Thermal Characteristics Parameter Thermal Resistance - Junction to Ambient Symbol (vi) θJA Min. Max. Unit 25 °C/W Table 4 Thermal Characteristics (vi) Static airflow Revision v4.0, February 2016 © 2012 Semtech Corp. 8 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 2.4 DATASHEET Electrical Specifications All values are valid within the operating conditions unless otherwise specified. Parameter Symbol Conditions Min. Typ. Max. Unit IOP,active 30ms scan period, 8 sensors enabled, common sensitivity 0 proximity sensing OFF 200 275 uA Doze mode, average IOP,Doze 195ms scan period, 8 sensors enabled, common sensitivity 0 proximity sensing OFF 70 100 uA Sleep IOP,sleep I2C listening, sensors disabled 8 17 uA IQS,active 30ms scan period, 8 sensors enabled, sensitivity 2 for buttons sensitivity 7 for proximity proximity sensing ON 800 1100 uA IQS,Doze 195ms scan period, 8 sensors enabled, sensitivity 2 for buttons sensitivity 7 for proximity proximity sensing ON 160 220 uA 0.7*VDD VDD + 0.3 V VSS - 0.3 0.8 V ±1 uA Current consumption Active mode, average Active mode, average (Quick Start application) Doze mode, average (Quick Start application) ResetB, SCL, SDA Input logic high VIH Input logic low VIL VSS applied to GND pins Input leakage current LI CMOS input Pull up resistor RPU when enabled 660 kΩ Pull down resistor RPD when enabled 660 kΩ Output logic high VOH IOH CompNegCntMax = ticks, no-touch = ticks < CompNegThreshold Figure 52 Negative Ticks Offset Compensation Trigger BtnCompNegThresh Small negative ticks are considered as normal operation and will occur very often. Larger negative ticks however need to be avoided and a convenient method is to trigger an offset compensation phase. The new set of DCV will assure the idle ticks will be close to zero again. A trade-off has to be found for the value of this register. A negative threshold too close to zero will trigger a compensation phase very often. A very negative threshold will never trigger. BtnCompNegCntMax As soon as the ticks get smaller than the Negative Threshold the Negative Counter starts to count. If the counter goes beyond the Negative Counter Max then the offset compensation phase is triggered. The recommended value for this register is ‘1’ which means that the offset compensation starts on the first tick below the negative threshold. BtnHysteresis The hysteresis percentage is identical for all buttons. A touch is detected if the ticks are getting larger as the value defined by: Revision v4.0, February 2016 © 2012 Semtech Corp. 54 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET CapThreshold + CapThreshold * hysteresis. A release is detected if the ticks are getting smaller as the value defined by: CapThreshold - CapThreshold * hysteresis. BtnStuckAtTimeout The stuckat timer can avoid sticky buttons. If the stuckat timer is set to one second then the touch of a finger will last only for one second and then a compensation will be performed and button hence considered released, even if the finger remains on the button for a longer time. After the actual finger release the button can be touched again and will be reported as usual. In case the stuckat timer is not required it can be set to zero. BtnStrongestHysteresis This parameter defines the hysteresis value for the adjacent button filtering engine. This parameter is only valid when BtnCfg has been configured to report the strongest touch. When the SX8661Z device has been configured to report the strongest touch, a situation may arise where the CAP signals of two sensors are of approximately equal value. Environmental noise can cause the signals of these two sensors to fluctuate as shown in Figure 55 (b). (a) (b) CAP1 Fluctuation CAP0 Strongest Hysteresis Figure 53 Strongest touch and Hysteresis As a result of that, the output of the SX8661Z device would also change very quickly as each of the two sensors becomes the sensor with the strongest touch value. To eliminate this jitter, the SX8661Z device adds a hysteresis element to the calculation of the strongest touch sensor. In that respect, the strongest CAP sensor is calculated as the sensor whose value is greater that the second detected strongest CAP sensor by the Strongest hysteresis amount. For example, as shown in Figure 55, the strongest CAP sensor is initially CAP0 (Figure 55 (b)). CAP1 becomes the strongest detected touch only if at some point in time the following holds true: CAP1 signal = CAP0 signal + StrongestHysteresis Similarly, if CAP2 is now also touched, it will only become the strongest detected touch if: CAP2 signal = CAP1 signal + StrongestHysteresis. BtnLongPressTimer Revision v4.0, February 2016 © 2012 Semtech Corp. 55 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET This timer defines the time in seconds that the AOI will put out a voltage level corresponding to the button touched. The timer is applicable in the Single Reporting Mode. After the timer expires the AOI will return to the idle level even if the button is still touched. The I2C status and GPO are not affected by this timer (i.e. they will be updated when the button is actually released). Revision v4.0, February 2016 © 2012 Semtech Corp. 56 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 5.6 DATASHEET Analog Output Interface Parameters Analog Output Interface (AOI) Parameters Address Name Bits Description 0x2B AoiCfg 7:6 Reserved (0x00). 5:4 Defines AoiLevelDuringBuzzer (same for A&B). 0x00: AOI button level 0x01: AOI Idle level 0x10: min level (0V) 0x11: max level( VDD) 3 Defines Aoi pwm period (same for A&B). 0: 0xFF (255) 1: 0x3F (63) 2:0 Reserved (0x01) 7:0 Button[7] 0x2C AoiBtnMapMsb Button[6] Button[5] Button[4] 0x2D AoiBtnMapLsb 7:0 Button[3] Maps a button touch to one of the two Analog Output Interfaces (AOI-A / AOI-B), or both. 00 : None 01 : AOI-A (GPIO7) 10 : AOI-B (GPIO6) 11 : Both Button[2] Button[1] Button[0] or Proximity 0x2E AoiLevelBtn0 7:0 0x2F AoiLevelBtn1 7:0 0x30 AoiLevelBtn2 7:0 0x31 AoiLevelBtn3 7:0 0x32 AoiLevelBtn4 7:0 0x33 AoiLevelBtn5 7:0 0x34 AoiLevelBtn6 7:0 0x35 AoiLevelBtn7 7:0 0x36 AoiLevelIdle 7:0 Defines the level index (cf Table 7) for Buttons, Idle or Proximity (for CAP0) The level index should be smaller or equal to Aoi pwm period as defined in AoiCfg[3]. 0x00: 0 0x01: 1 … 0xFF: 255 Table 21 AOI Parameters AoiBtnMap This register is used to map the available buttons to SWI-A, AOI-B or both. For example, to map buttons 0 to 3 and buttons 4 to 7 on AOI-B, write the following value to the AoiPwmBtnMap register AoiCfg = 0xAA55; AoiLevelBtn0, AoiLevelBtn1, AoiLevelBtn7, AoiLevelIdle Revision v4.0, February 2016 AoiLevelBtn2, AoiLevelBtn3, © 2012 Semtech Corp. 57 AoiLevelBtn4, AoiLevelBtn5, AoiLevelBtn6, www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET These registers define the level that will be output on AOI-A or AOI-B (depending on button mapping) when the corresponding button is touched or when the corresponding state is active or idle. The duty cycle is defined as a number of steps. The mean voltage of a PWM signal is given by: Mean voltage ≈ (AoiLevelBtnx / AoiPmwPeriod) * Maximum Voltage (VDD) or: AoiLevelBtnx ≈ (Mean voltage / Maximum Voltage (VDD)) * AoiPmwPeriod AoiPwmPeriod is 255 or 63. Example: When button 0 is touched the desired AOI voltage is 0.30 Volts. To calculate the AoiLevelBtnx is as follows (with AoiPwmPeriod=255): Assuming a 3.3V VDD: AoiLevelBtnx ≈ (Mean voltage / Maximum Voltage (VDD)) * AoiPmwPeriod ≈ (0.3/3.3) * 255 ≈ 23 decimal Write 0x17 in the register AoiBtn0DutyCycle. Revision v4.0, February 2016 © 2012 Semtech Corp. 58 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 5.7 DATASHEET Buzzer Parameters Buzzer Parameters Address Name Bits Description 0x37 BuzzerCfg 7:6 Defines the phase 1 duration. 0x00: ~ 5ms 0x01: ~ 10ms 0x02: ~ 15ms 0x03: ~ 30ms 5:4 Defines the phase 2 duration. 0x00: ~ 5ms 0x01: ~ 10ms 0x02: ~ 15ms 0x03: ~ 30ms 3 Defines the buzzer idle level (BuzzerLevelIdle). 0x0: min level (0V) 0x1: max level (VDD) 2:0 Defines the buzzer pwm prescaler value. 0x38 BuzzerFreqPhase1 7:0 Defines the frequency for the first phase of the buzzer. freq ≈ 4MHz /(2^prescaler * BuzzerFreqPhase1) 0x39 BuzzerFreqPhase2 7:0 Defines the frequency for the second phase of the buzzer. freq ≈ 4MHz /(2^prescaler * BuzzerFreqPhase2) 0x3A Reserved 7:0 Reserved (0x00) Table 22 Buzzer Parameters The buzzer parameters are described in section 3.6. Revision v4.0, February 2016 © 2012 Semtech Corp. 59 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 5.8 DATASHEET Mapping Parameters Mapping Parameters Address Name Bits Description 0x3B MapAutoLight0 7:4 GPIO[7] 3:0 GPIO[6] 7:4 GPIO[5] 3:0 GPIO[4] 7:4 GPIO[3] 3:0 GPIO[2] 7:4 GPIO[1] 3:0 GPIO[0] 0x3C 0x3D 0x3E MapAutoLight1 MapAutoLight2 MapAutoLight3 0x3F MapAutoLightGrp0Msb 7:0 Reserved (0x00) 0x40 MapAutoLightGrp0Lsb 7 Btn7 6 Btn6 5 Btn5 4 Btn4 3 Btn3 2 Btn2 1 Btn1 0 Btn0 or Proximity 0x41 MapAutoLightGrp1Msb 7:0 Reserved (0x00) 0x42 MapAutoLightGrp1Lsb 7 Btn7 6 Btn6 5 Btn5 4 Btn4 3 Btn3 2 Btn2 1 Btn1 0 Btn0 or Proximity Defines the mapping between GPOs (with Autolight ON) and sensor events. 0x00: Btn0 or Proximity 0x01: Btn1 … 0x07: Btn7 0x08…0x0B: Reserved 0x0C: Group0 as defined by MapAutoLightGrp0 0x0D: Group1 as defined by MapAutoLightGrp1 0x0E: Reserved 0x0F: Reserved Several GPOs can be mapped to the same sensor event and will be controlled simultaneously. Defines Group0 sensor events: 0: OFF 1: ON If any of the enabled sensor events occurs the Group0 event will occur as well. All sensors events within the group can be independently set. Defines Group1 sensor events: 0: OFF 1: ON If any of the enabled sensor events occurs the Group0 event will occur as well. All sensors events within the group can be independently set. Table 23 Mapping Parameters MapAutoLight0, MapAutoLight1, MapAutoLight2, MapAutoLight3 MapAutoLightGrp0Msb, MapAutoLightGrp0Lsb, MapAutoLightGrp1Msb, MapAutoLightGrp1Lsb These registers define the mapping between the GPO pins (with Autolight ON) and the sensor information which will control its ON/OFF state. The mapping can be done to a specific sensor event but also on groups (in this case any sensor event in the group will control the GPO). Revision v4.0, February 2016 © 2012 Semtech Corp. 60 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET Table 24 defines for each selectable sensor event, which action will trigger corresponding GPO to switch ON or OFF. MapAutoLight BtnX GPO ON GPO OFF Touch Release Table 24 Autolight Mapping, Sensor Information Examples: - If GPO[0] should change state accordingly to Btn4 then MapAutoLight3[3:0] should be set to 0x04. - If GPO[0] should change state accordingly to Btn0 or Btn1 then Group0 can be used as following: - MapAutoLight3[3:0] should be set to 0x0C (i.e. Group0). - MapAutoLightGrp0 should be set to 0x0003 (i.e. Btn0 or Btn1) Revision v4.0, February 2016 © 2012 Semtech Corp. 61 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 5.9 DATASHEET GPIO Parameters GPIO Parameters Address Name Bits Description 0x43 GpioMode7_4 0x44 GpioMode3_0 7:6 GPIO[7] Mode Defines the GPIO mode. 00: GPO 5:4 GPIO[6] Mode 01: GPP 3:2 GPIO[5] Mode 10: Reserved 11: SPO: AOI-A for GPIO[7], 1:0 GPIO[4] Mode AOI-B for GPIO[6], Buzzer for GPIO[5]), 7:6 GPIO[3] Mode Reserved for GPIO[4..0] 5:4 GPIO[2] Mode 3:2 GPIO[1] Mode 1:0 GPIO[0] Mode 0x45 GpioIntensityOn0 0x46 GpioIntensityOn1 0x47 GpioIntensityOn2 0x48 GpioIntensityOn3 7:0 Defines the ON intensity index. 0x00: 0 7:0 0x01: 1 7:0 … 0xFF: 255 7:0 0x49 GpioIntensityOn4 7:0 0x4A GpioIntensityOn5 7:0 0x4B GpioIntensityOn6 7:0 0x4C GpioIntensityOn7 7:0 0x4D GpioIntensityOff0 0x4E GpioIntensityOff1 0x4F GpioIntensityOff2 0x50 GpioIntensityOff3 7:0 Defines the OFF intensity index. 0x00: 0 7:0 0x01: 1 7:0 … 0xFF: 255 7:0 0x51 GpioIntensityOff4 7:0 0x52 GpioIntensityOff5 7:0 0x53 GpioIntensityOff6 7:0 0x54 GpioIntensityOff7 7:0 0x56 GpioOutPwrUp 7:0 Defines the values of GPO and GPP pins after power up i.e. default values of I2C parameters GpoCtrl and GppIntensity respectively. Bits corresponding to GPO pins with Autolight ON should be left to 0. Before being actually initialized GPIOs are set as inputs with pull up. 0: OFF(GPO) / IntensityOff (GPP) 1: ON (GPO) / IntensityOn (GPP) 0x57 GpioAutoLight 7:0 Enables Autolight in GPO mode. 0 : OFF 1 : ON 0x58 GpioPolarity 7:0 Defines the polarity of the GPO and GPP pins. SPO pins require Normal Polarity. 0: Inverted Revision v4.0, February 2016 © 2012 Semtech Corp. 62 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET GPIO Parameters Address Name Bits Description 1: Normal 0x59 GpioFunction 7:0 Defines the intensity index vs PWM pulse width function. 0: Logarithmic 1: Linear 0x5A GpioIncFactor 7:0 Defines the fading increment factor. 0: intensity index incremented every increment time 1: intensity index incremented every 16 increment times 0x5B GpioDecFactor 7:0 Defines the fading decrement factor. 0: intensity index decremented every decrement time 1: intensity index decremented every 16 decrement times 0x5C GpioIncTime7_6 7:4 GPIO[7] Fading Increment Time 3:0 GPIO[6] Fading Increment Time 0x5D GpioIncTime5_4 7:4 GPIO[5] Fading Increment Time 3:0 GPIO[4] Fading Increment Time 0x5E GpioIncTime3_2 7:4 GPIO[3] Fading Increment Time 3:0 GPIO[2] Fading Increment Time 0x5F GpioIncTime1_0 Defines the fading increment time. 0x0: OFF 0x1: 0.5ms 0x2: 1ms … 0xF: 7.5ms The total fading in time will be: GpioIncTime*GpioIncFactor* (GpioIntensityOn – GpioIntensityOff) 7:4 GPIO[1] Fading Increment Time 3:0 GPIO[0] Fading Increment Time 0x60 GpioDecTime7_6 7:4 GPIO[7] Fading Decrement Time 3:0 GPIO[6] Fading Decrement Time 0x61 GpioDecTime5_4 7:4 GPIO[5] Fading Decrement Time 3:0 GPIO[4] Fading Decrement Time 0x62 GpioDecTime3_2 7:4 GPIO[3] Fading Decrement Time 3:0 GPIO[2] Fading Decrement Time 0x63 GpioDecTime1_0 7:4 GPIO[1] Fading Decrement Time 3:0 GPIO[0] Fading Decrement Time 0x64 GpioOffDelay7_6 GpioOffDelay5_4 7:4 GPIO[5] OFF Delay 3:0 GPIO[4] OFF Delay 0x66 GpioOffDelay3_2 7:4 GPIO[3] OFF Delay 3:0 GPIO[2] OFF Delay 0x67 GpioOffDelay1_0 7:4 GPIO[1] OFF Delay 3:0 GPIO[0] OFF Delay Revision v4.0, February 2016 The total fading out time will be: GpioDecTime*GpioDecFactor* (GpioIntensityOn – GpioIntensityOff) 7:4 GPIO[7] OFF Delay 3:0 GPIO[6] OFF Delay 0x65 Defines the fading decrement time. 0x0: OFF 0x1: 0.5ms 0x2: 1ms … 0x4: 2.0ms … 0xF: 7.5ms © 2012 Semtech Corp. 63 Single Fading Mode Defines the delay between release and start of fading out. 0x0: instantaneous 0x1: 200 ms 0x2: 400 ms 0x3: 600ms … 0xA: 2s 0xB: 4s … 0xF: 12s www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET GPIO Parameters Address Name Bits Description 0x68 GpioPullUpDown7_4 7:6 GPIO[7] Pullup/down 5:4 GPIO[6] Pullup/down 3:2 GPIO[5] Pullup/down Enables pullup/down resistors for GPIO pins. 00 : None 01 : Pullup 10 : Pulldown 11 : Reserved 1:0 GPIO[4] Pullup/down 0x69 GpioPullUpDown3_0 7:6 GPIO[3] Pullup/down 5:4 GPIO[2] Pullup/down 3:2 GPIO[1] Pullup/down 1:0 GPIO[0] Pullup/down 0x6A Reserved 7:0 Reserved (0x00) 0x6B Reserved 7:0 Reserved (0x00) 0x6C Reserved 7:0 Reserved (0x00) 0x6D GpioFadingMode7_4 7:6 Fading mode for GPIO[7] 5:4 Fading mode for GPIO[6] 3:2 Fading mode for GPIO[5] 1:0 Fading mode for GPIO[4] 0x6E GpioFadingMode3_0 7:6 Fading mode for GPIO[3] 5:4 Fading mode for GPIO[2] 3:2 Fading mode for GPIO[1] 1:0 Fading mode for GPIO[0] Revision v4.0, February 2016 © 2012 Semtech Corp. 64 Defines the Fading mode for GPO[7:0]. 00: Single Fading Mode 01: Continuous Fading Mode 10: Reseved 11: Reserved The fading modes are expected to be defined at power up by the QSM or NVM. In case the fading modes need to be changed after power up this can be done when the GPOs are all OFF. www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET Table 25 resumes the applicable SPM and I2C parameters for each GPIO mode. SPM I2C 1 GpioMode GpioOutPwrUp GpioAutolight GpioPolarity GpioIntensityOn GpioIntensityOff GpioFunction GpioIncFactor GpioDecFactor GpioIncTime GpioDecTime GpioOffDelay GpioPullUpDown IrqSrc[4] GpoCtrl GppPinId GppIntensity GPP X 1 X X 1 X 1 X X GPO X 2,3 X X X X X X X X X X X X SPO 5 X 4 X 1 X At power up, GppIntensity of each GPP pin is initialized with GpioIntensityOn or GpioIntensityOff depending on GpioOutPwrUp corresponding bits value. 2 Only if Autolight is OFF, else must be left to 0 (default value) 3 GpioOutPwrUp must be set to OFF in Continuous Fading Mode (with Autolight OFF) 4 Only if Autolight is OFF, else ignored 5 In SPO mode assure the following settings: GpioOutPwrUp=OFF, GpioAutoLight=ON, GpioPolarity=Normal, GpioFunction=Linear Table 25 Applicable SPM/I2C Parameters vs. GPIO Mode Revision v4.0, February 2016 © 2012 Semtech Corp. 65 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 6 I2C INTERFACE The I2C implemented on the SX8661Z is compliant with: - standard (100kb/s), fast mode (400kb/s) - slave mode - 7 bit address (default 0x2B). The default address can be changed in the NVM at address 0x04. The host can use the I2C to read and write data at any time. The effective changes will be applied at the next processing phase (section 3.2). Three types of registers are considered: - status (read). These registers give information about the status of the capacitive buttons, GPIs, operation modes etc… - control (read/write). These registers control the soft reset, operating modes, GPIOs and offset compensation. - SPM gateway (read/write). These registers are used for the communication between host and the SPM. The SPM gateway communication is done typically at power up and is not supposed to be changed when the application is running. The SPM needs to be re-stored each time the SX8661Z is powered down. The SPM can be stored permanently in the NVM memory of the SX8661Z. The SPM gateway communication over the I2C at power up is then not required. The I2C will be able to read and write from a start address and then perform read or writes sequentially, and the address increments automatically. The supported I2C access formats are described in the next sections. 6.1 I2C Write The format of the I2C write is given in Figure 54. After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The SX8661Z then acknowledges [A] that it is being addressed, and the master sends an 8 bit Data Byte consisting of the SX8661Z Register Address (RA). The slave acknowledges [A] and the master sends the appropriate 8 bit Data Byte (WD0). Again the slave acknowledges [A]. In case the master needs to write more data, a succeeding 8 bit Data Byte will follow (WD1), acknowledged by the slave [A]. This sequence will be repeated until the master terminates the transfer with the Stop condition [P]. S S: SA: A: RA: WDn: P: SA 0 A RA A WD0 Start condition Slave Address Acknowledge Register Address Write Data byte (0...n) Stop condition A WD1 A WDn optional A P optional from master to slave from slave to master Figure 54 I2C write The register address is incremented automatically when successive register data (WD1...WDn) is supplied by the master. Revision v4.0, February 2016 © 2012 Semtech Corp. 66 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.2 DATASHEET I2C read The format of the I2C read is given in Figure 55. After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The SX8661Z then acknowledges [A] that it is being addressed, and the master responds with an 8 bit data consisting of the Register Address (RA). The slave acknowledges [A] and the master sends the Repeated Start Condition [Sr]. Once again, the slave address (SA) is sent, followed by an eighth bit (‘1’) indicating a Read. The SX8661Z responds with acknowledge [A] and the Read Data byte (RD0). If the master needs to read more data it will acknowledge [A] and the SX8661Z will send the next read byte (RD1). This sequence can be repeated until the master terminates with a NACK [N] followed by a stop [P]. S S: SA: Sr: A: N: RA: RDn: P: SA 0 A RA A Sr SA 1 A RD0 Start condition Slave Address Repeated Start condition Acknowledge Not Acknowledge (terminating read stream) Register Address Read Data byte (0...n) Stop condition A RD1 optional A RDn N P optional from master to slave from slave to master Figure 55 I2C read Revision v4.0, February 2016 © 2012 Semtech Corp. 67 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.3 DATASHEET I2C Registers Overview Address Name R/W Description 0x00 IrqSrc read Interrupt Source 0x01 Reserved 0x02 CapStat read Button Status 0x03 Reserved 0x04 Reserved 0x05 Reserved 0x06 Reserved 0x07 Reserved 0x08 SpmStat read SPM Status 0x09 CompOpMode read/write Compensation and Operating Mode 0x0A GpoCtrl read/write GPO Control 0x0B GppPinId read/write GPP Pin Selection 0x0C GppIntensity read/write GPP Intensity 0x0D SpmCfg read/write SPM Configuration 0x0E SpmBaseAddr read/write SPM Base Address 0x0F Reserved 0xAC SpmKeyMsb read/write SPM Key MSB 0xAD SpmkeyLsb read/write SPM Key LSB 0xB1 SoftReset read/write Software Reset Table 26 I2C Registers Overview Revision v4.0, February 2016 © 2012 Semtech Corp. 68 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.4 DATASHEET Status Registers Address 0x00 Name Bits Description 7 Reserved 6 NVM burn interrupt flag 5 SPM write interrupt flag 4 Reserved 3 Reserved 2 Buttons/Proximity interrupt flag 1 Compensation interrupt flag 0 Operating Mode interrupt flag IrqSrc Interrupt source flags 0: Inactive (default) 1: Active INTB goes low if any of these bits is set. More than one bit can be set. Reading IrqSrc clears it together with INTB. Table 27 Interrupt Source The delay between the actual event and the flags indicating the interrupt source may be one scan period. IrqSrc[6] is set once NVM burn procedure is completed. IrqSrc[5] is set once SPM write is effective. IrqSrc[2] is set if a Button/Proximity event occurred (touch or release if enabled). CapStatLsb show the detailed status of the Buttons. IrqSrc[1] is set once compensation procedure is completed either through automatic trigger or via host request. IrqSrc[0] is set when actually entering Active or Doze mode via host request. CompOpmode shows the current operation mode. Revision v4.0, February 2016 © 2012 Semtech Corp. 69 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING Address Name 0x02 Bits Description 7 Status button 7 6 Status button 6 5 Status button 5 4 Status button 4 3 Status button 3 2 Status button 2 1 Status button 1 0 Status button 0 CapStat DATASHEET Status of individual buttons 0: Released (default) 1: Touched Table 28 I2C Cap status Address 0x08 Name Bits Description 7:4 reserved 3 NvmValid 2:0 Indicates the number of times NVM has been burned: 0: None – QSM is used (default) 1: Once – NVM is used if NvmValid = 1, else QSM. NvmCount 2: Twice – NVM is used if NvmValid = 1, else QSM. 3: Three times – NVM is used if NvmValid = 1, else QSM. 4: More than three times – QSM is used Indicates if the current NVM is valid. 0: No – QSM is used 1: Yes – NVM is used SpmStat Table 29 I2C SPM status Revision v4.0, February 2016 © 2012 Semtech Corp. 70 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.5 DATASHEET Control Registers Address Name Bits Description 7:3 Reserved*, write only ‘00000’ 2 0x09 Compensation Indicates/triggers compensation procedure 0: Compensation completed (default) 1: read -> compensation running ; write -> trigger compensation Operating Mode Indicates/programs** operating mode 00: Active mode (default) 01: Doze mode 10: Sleep mode 11: Reserved CompOpMode 1:0 * The reading of these reserved bits will return varying values. ** After the operating mode change (Active/Doze) the host should wait for INTB or 300ms before performing any I2C read access. Table 30 I2C compensation, operation modes Address Name 0x0A GpoCtrl Bits 7:0 Description GpoCtrl[7:0] Triggers ON/OFF state of GPOs when Autolight is OFF 0: OFF (i.e. go to IntensityOff) 1: ON (i.e. go to IntensityOn) Default is set by SPM parameter GpioOutPwrUp Bits of non-GPO pins are ignored. Table 31 I2C GPO Control Revision v4.0, February 2016 © 2012 Semtech Corp. 71 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING Address 0x0B Name Bits Description 7:3 Reserved, write only ‘00000’ GppPinId 2:0 GPP Pin Identifier DATASHEET Defines the GPP pin to which the GppIntensity is assigned for the following read/write operations 0x0 = GPP0 (default) 0x1 = GPP1 ... 0x7 = GPP7 GPPx refers to pin GPIOx configured as GPP Table 32 I2C GPP Pin Identifier Address 0x0C Name GppIntensity Bits 7:0 Description Defines the intensity index of the GPP pin selected in GppPinId 0x00: 0 0x01: 1 … 0xFF: 255 Reading returns the intensity index of the GPP pin selected in GppPinId. Default value is IntensityOn or IntensityOff depending on GpioOutPwrUp. Table 33 I2C GPP Intensity Address 0xB1 Name Bits Description SoftReset 7:0 Writing 0xDE followed by 0x00 will reset the chip. Table 34 I2C Soft Reset Revision v4.0, February 2016 © 2012 Semtech Corp. 72 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.6 DATASHEET SPM Gateway Registers The SX8661Z I2C interface offers two registers for exchanging the SPM data with the host. • SpmCfg • SpmBaseAddr Address 0x0D Name Bits Description 7:6 00: Reserved 5:4 Defines the normal operation or SPM mode 00: I2C in normal operation mode (default) 01: I2C in SPM mode 10: Reserved 11: Reserved 3 Defines r/w direction of SPM 0: SPM write access (default) 1: SPM read access 2:0 000: Reserved SpmCfg Table 35 SPM access configuration Address Name Bits Description 0x0E SpmBaseAddr 7:0 SPM Base Address (modulo 8). The lowest address is 0x00 (default) The highest address is 0x78. Table 36 SPM Base Address The exchange of data, read and write, between the host and the SPM is always done in bursts of eight bytes. The base address of each burst of eight bytes is a modulo 8 number, starting at 0x00 and ending at 0x78. The registers SpmKeyMsb and SpmKeyLsb are required for NVM programming as described in section 6.7. Address 0xAC Name Bits Description SpmKeyMsb 7:0 SPM to NVM burn Key MSB Unlock requires writing data: 0x62 Table 37 SPM Key MSB at I2C register address 0xAC Address 0xAD Name Bits Description SpmKeyLsb 7:0 SPM to NVM burn Key LSB Unlock requires writing data: 0x9D Table 38 SPM Key LSB Revision v4.0, February 2016 © 2012 Semtech Corp. 73 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.6.1 DATASHEET SPM Write Sequence The SPM must always be written in blocks of 8 bytes. The sequence is described below: 1. Set the I2C in SPM mode by writing “01” to SpmCfg[5:4] and SPM write access by writing ‘0’ to SpmCfg[3]. 2. Write the SPM base address to SpmBaseAddr (The base address needs to be a value modulo 8). 3. Write the eight consecutive bytes to I2C address 0, 1, 2, …7 4. Terminate by writing “000” to SpmCfg[5:3]. 1) S SA 0 A 0x0D A 0x10 A P 2) S SA 0 A 0x0E A BA A P 3) S SA 0 A 0x00 A WD0 ... WD7 4) S SA 0 A 0x0D A 0x00 A P S SA A BA WDn P : Start condition : Slave address : Slave acknowledge : NVM Base Address : Write Data byte n, n = 0 to 7 : Stop condition A P From master to slave From slave to master Figure 56 SPM write sequence The complete SPM can be written by repeating 16 times the cycles shown in Figure 56 using base addresses 0x00, 0x08, 0x10,…0x70, 0x78. Once the SPM write sequence is actually applied, the INTB pin will be asserted. The host clears the interrupt by reading any I2C register. At the same time the bit GenStatMsb[6], indicating the SPM write is done, will be cleared. Revision v4.0, February 2016 © 2012 Semtech Corp. 74 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.6.2 DATASHEET SPM Read Sequence The SPM must always be read in blocks of 8 bytes. The sequence is described below: 1. Set the I2C in SPM mode by writing “01” to SpmCfg[5:4] and SPM read access by writing ‘1’ to SpmCfg[3]. 2. Write the SPM base address to SpmBaseAddr (The base address needs to be a value modulo 8). 3. Read the eight consecutive bytes from I2C address 0, 1, 2, …7 4. Terminate by writing “000” to SpmCfg[5:3]. 1) S SA 0 A 0x0D A 0x18 A P 2) S SA 0 A 0x0E A BA A P 3) S SA 0 A 0x00 A Sr SA 1 4) S SA 0 A 0x0D A 0x00 A P S,Sr SA A N BA RDn P : Start condition : Slave address : Slave acknowledge : Not Acknowledge (terminates read stream) : NVM Base Address : Read Data byte n, n = 0 to 7 : Stop condition A RD0 A ... RD7 N P From master to slave From slave to master Figure 57 SPM Read Sequence The complete SPM can be read by repeating 16 times the cycles shown in Figure 57 using base addresses 0x00, 0x08, 0x10,…0x70, 0x78. Once the SPM read sequence is actually applied, the INTB pin will be asserted. The host clears the interrupt by reading any I2C register. At the same time the bit GenStatMsb[6], indicating the SPM write is done, will be cleared. Revision v4.0, February 2016 © 2012 Semtech Corp. 75 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.7 DATASHEET NVM burn The content of the SPM can be copied permanently (burned) into the NVM to be used as the new default parameters. The burning of the NVM can be done up to three times and must be done only when the SPM is completely written with the desired data. The number of times the NVM has been burned can be monitored by reading NvmCycle from the I2C register GenStatLsb[7:5]. NVM QSM 1 0 2 3 4 GenstatLsb[7:5] SPM Figure 58 Simplified Diagram NvmCycle Figure 58 shows the simplified diagram of the NvmCycle counter. The SX8661Z is delivered with first NVM burned and NvmCycle set to one. The SPM points to the first NVM. Each NVM burn will increase the NvmCycle. At the fourth NVM burn the SX8661Z switches definitely to the QSM. The burning of the SPM into the NVM is done by executing a special sequence of four I2C commands. 1. Write the data 0x62 to the I2C register I2CKeyMsb. 2. Write the data 0x9D to the I2C register I2CKeyLsb. 3. Write the data 0xA5 to the I2C register I2CSpmBaseAddr. 4. Write the data 0x5A to the I2C register I2CSpmBaseAddr. Terminate the I2C write by a STOP. Terminate the I2C write by a STOP. Terminate the I2C write by a STOP. Terminate the I2C write by a STOP. This is illustrated in Figure 59. 1) S SA 0 A 0xAC A 0x62 A P 2) S SA 0 A 0xAD A 0x9D A P 3) S SA 0 A 0x0E A 0xA5 A P 4) S SA 0 A 0x0E A 0x5A A P S SA A P : Start condition : Slave address : Slave acknowledge : Stop condition From master to slave From slave to master Figure 59: NVM burn procedure Revision v4.0, February 2016 © 2012 Semtech Corp. 76 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 6.8 DATASHEET Monitor Mode Monitor mode allows the host to read “real-time” sensor information (CAPxRaw, CAPxAvg, CAPxDiff). It is enabled by setting bit 2 of I2C register SpmCfg (address 0x0D). When enabled, it uses a specific monitor scan period (Cf below) and generates an interrupt every time a new full set of data is available (hence every scan period). Address Name 0xF9 Bits MonitorScanPeriod 7:0 Description Monitor Mode Scan Period 0x00: Reserved 0x01: 15ms … 0x0D: 195ms (default) … 0xFF: 255 x 15ms Monitor mode scan period is located at address 0xF9 can be written similarly as SPM data (Cf. §6.6.1). Interrupt is cleared normally by reading I2C register IrqSrc (address 0x00) but no specific flag is set. CAPxRaw/Avg/Diff data can be read similarly as SPM data (Cf. §6.6.2). Base address BA = 0xB4 is the beginning of the CAPxDiff data location and data are organized this way: 0xB4: CAP0Diff, MSB 0xB5: CAP0Diff, LSB 0xB6: CAP1Diff, MSB etc... Values are coded 16bits signed 2's complement format and updated at each scan period. Base address BA = 0x80 is the beginning of the CAPxRaw data location. Base address BA = 0x9A is the beginning of the CAPxAvg data location. Data should be read before the next interrupt occurs (i.e. within one scan period). Revision v4.0, February 2016 © 2012 Semtech Corp. 77 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 7 APPLICATION INFORMATION 7.1 Triple proximity reporting This section describes the application corresponding to QSM settings One AOI with seven LEDs are used. The intensity level of the LEDs show if proximity (medium intensity) or a touch (maximum intensity) is detected. The LEDs are off in case no finger is present. mother board cap2 gpo6 SX8661Z cap0 cap1 gpo7 vdig vana o pr resetb ity m xi gnd Analog Output Interface analog sensor interface clock generation RC PWM LED controller d6 gnd gpo5 d5 gpo4 d4 cap3 power management gpo3 d3 cap4 cap5 cap6 cap7 micro processor GPIO controller gpo2 RAM NVM gpo1 ROM I2C gpo0 d2 gnd d1 d0 sda scl intb vdd cp cn bottom plate Figure 60 Typical Application (one AOI), triple proximity reporting In case of proximity all LEDs (d0 to d6) are enabled to a medium intensity. If a sensor is touched then only the corresponding LED will light up with full intensity. The other LEDs remain at medium intensity. Revision v4.0, February 2016 © 2012 Semtech Corp. 78 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 7.2 DATASHEET Dual proximity reporting Two AOIs and two LEDs are used. One LED is showing proximity and the second LED (or multiple LEDs) for showing any touch. clock generation RC PWM LED controller gpo5 gpo4 dx analog sensor interface gnd d1 cap2 gpo6 SX8661Z cap0 cap1 gpo7 vdig gnd resetb vana pr ox i m ity mother board Analog Output Interface cap3 power management gpo3 cap4 cap5 cap6 micro processor GPIO controller RAM NVM ROM I2C gpo2 gnd gpo1 gpo0 cap7 d0 sda scl intb vdd cp cn bottom plate Figure 61 Typical Application (two AOI), dual proximity reporting Revision v4.0, February 2016 © 2012 Semtech Corp. 79 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING leds (gpoi[1]) Prox Touch Release &Prox DATASHEET No Prox ON OFF 10 seconds led (gpio[0]) ON OFF breathing (~1Hz) AOI idle prox prox+btn_x idle prox Figure 62 dual proximity LED and AOI reporting Figure 62 shows the reporting on the LEDs and the AOI for the application with two AOIs. On proximity all the LEDs (d1 to dx) are enabled to maximum light intensity. A touch on any button is shown by the continuous fading in and fading out of the LED d0. prox key1 key2 key3 key4 key5 key6 key7 AOI-A idle 0.6V 0.9V 1.2V idle idle idle idle AOI-B idle idle idle idle 1.5V 1.8V 2.1V 2.4V Table 39 example AOI-A, AOIB Revision v4.0, February 2016 © 2012 Semtech Corp. 80 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 7.2.1 DATASHEET SPM file (application two AOI, dual proximity reporting) #Address[Hex] 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1D 0x1E 0x1F 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F Value[Hex] 0xxx 0xxx 0x41 0xxx 0x2B 0x02 0x0D 0x00 0x00 0x05 0x00 0x55 0x57 0x73 0x33 0x33 0x33 0x00 0x00 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0xA0 0x00 0x00 0x00 0x0A 0x00 0x70 0x50 0x50 0x01 0x0A 0x00 0x80 0x00 0x00 0x00 0xFF 0x01 0xAA 0x55 0xFF 0x2E 0x45 0x5D 0x74 0x8B 0xA3 0xBA 0xFF 0xA4 0x40 0x20 0x00 0x00 0x00 0x00 0x0C 0x00 Revision v4.0, February 2016 #Address[Hex] 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x48 0x49 0x4A 0x4B 0x4C 0x4D 0x4E 0x4F 0x50 0x51 0x52 0x53 0x54 0x55 0x56 0x57 0x58 0x59 0x5A 0x5B 0x5C 0x5D 0x5E 0x5F 0x60 0x61 0x62 0x63 0x64 0x65 0x66 0x67 0x68 0x69 0x6A 0x6B 0x6C 0x6D 0x6E 0x6F 0x70 0x71 0x72 0x73 0x74 0x75 0x76 0x77 0x78 0x79 0x7A 0x7B 0x7C 0x7D 0x7E 0x7F © 2012 Semtech Corp. 81 Value[Hex] 0xFE 0x00 0x00 0xF0 0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xFF 0x00 0xC3 0xC0 0xC0 0x00 0x00 0x04 0x44 0x44 0x44 0x00 0x44 0x44 0x44 0x00 0xEE 0xEE 0xE0 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x50 0x74 0x10 0x45 0x03 0xFF 0xFF 0xFF 0xD5 0x55 0x55 0x7F 0x23 0x22 0x41 0xFF 0x3D www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 7.3 DATASHEET Example of Touch+Proximity Module 7.3.1 Overview To demonstrate the proximity sensing feature of the SX8661Z/SX863x family, a module has been designed and is illustrated in figure below. Touch Buttons (1.5cm pitch) Module Size (white area) : sensors area + SX8633 + connector (min.) Proximity Sensor Bicolor LEDs (blue, orange) Overlay (2mm acrylic glass) Figure 63 Touch+Proximity Module Overview The touch button controller is running in stand-alone (i.e. without host) and uses the Autolight mode to turn LEDs ON/OFF accordingly to the touch buttons and proximity sensing status. 7.3.2 Operation Module operation can be seen as 5 steps which are described in figure below 1. No finger => No proximity detected => All LEDs OFF 2. Finger approaches => Proximity detected => Blue LEDs turned ON 3. Button touch => Orange LED turned ON (blue+orange = pink) 4. Button release => Orange LED turned OFF 5. Finger removed => No proximity detected => Blue LEDs turned OFF Figure 64 Touch+Proximity Module Operation Notes: - For better user experience, bicolor LEDs have been used here but one could decide to design a module with normal unicolor LEDs. In this case, step 3 above would simply consist in a higher (blue) intensity for the LED of the button touched. - For obvious demonstration purposes the overlay used here is transparent but in typical applications (TV, Monitor, Set-top box, etc) the overlay would be opaque enough so that when LEDs are OFF (i.e. no proximity detected) the PCB is not visible to the user. Revision v4.0, February 2016 © 2012 Semtech Corp. 82 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 7.3.3 DATASHEET Performance The proximity sensing distance of detection has been measured in these conditions: - CapProxEnable = ON - CapSensitivity = 7 (Max) - CapThreshold = 300 - Board main supplied and placed vertically i.e. same orientation as hand/finger - Finger pointing center button The results obtained are provided in table below: Palm Finger (natural position) Orthogonal finger (worst case) Distance of Detection ~10cm ~6cm ~4cm Table 40 Proximity Sensing Distance of Detection 7.3.4 Schematics Figure 65 Touch+Proximity Module Schematics Revision v4.0, February 2016 © 2012 Semtech Corp. 83 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING 7.3.5 DATASHEET Layout Figure 66 Touch+Proximity Module Layout - Top Figure 67 Touch+Proximity Module Layout - Mid1 Figure 68 Touch+Proximity Module Layout - Mid2 Figure 69 Touch+Proximity Module Layout - Bottom Revision v4.0, February 2016 © 2012 Semtech Corp. 84 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 8 REFERENCES [1] Capacitive Touch Sensing Layout guidelines on www.semtech.com Revision v4.0, February 2016 © 2012 Semtech Corp. 85 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 9 PACKAGING INFORMATION 9.1 Package Outline Drawing SX8661Z is assembled in a MLPQ-UT28 package as shown in Figure 70. A D PIN 1 INDICATOR (LASER MARK) DIM B E A2 A A A1 A2 b D D1 E E1 e L N aaa bbb DIMENSIONS MILLIMETERS INCHES MIN NOM MAX MIN NOM MAX .024 .001 (.006) .006 .008 .010 .154 .157 .161 .100 .104 .108 .154 .157 .161 .100 .104 .108 .016 BSC .012 .016 .020 28 .003 .004 .020 .000 0.60 0.02 (0.152) 0.15 0.20 0.25 3.90 4.00 4.10 2.55 2.65 2.75 3.90 4.00 4.10 2.55 2.65 2.75 0.40 BSC 0.30 0.40 0.50 28 0.08 0.10 0.50 0.00 SEATING PLANE aaa C C A1 LxN D1 E/2 E1 2 1 N e bxN D/2 bbb C A B NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. Figure 70 Package outline drawing 9.2 Land Pattern The land pattern of MLPQ-UT28 package, 4 mm x 4 mm is shown in Figure 71. Revision v4.0, February 2016 Figure 71 Land pattern © 2012 Semtech Corp. 86 www.semtech.com SX8661Z Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET © Semtech 2012 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Advanced Communications and Sensing Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 Revision v4.0, February 2016 © 2012 Semtech Corp. 87 www.semtech.com