Today’s Smart Sensors January 25, 2013 Randy Frank

Agenda Pressure Temperature Proximity Application Specific: Tire Pressure Monitoring Accelerometer Gyroscope Accelerometer & Magnetometer 9-axis IMU

Smart Pressure Sensor MEMS Relative Pressure Sensor Pressure and Vacuum 1 Bar Full Scale Analog output or SENT Protocol Integrated Signal Processing 16-Bit ADC 16-Bit MCU http://www.melexis.com/launch-mlx90809.aspx?utm_source=Print&utm_medium=PR&utm_campaign=MLX90809

Smart Pressure Sensor High accuracy relative pressure sensor (+/-1.5%FSO) Ratiometric Analog Output or digital SENT output (SAE J-2716 spec dated Jan 2010) Large automotive temperature range (-40C to 150C) Automotive qualified and automotive diagnostic features http://www.melexis.com/launch-mlx90809.aspx?utm_source=Print&utm_medium=PR&utm_campaign=MLX90809

Temperature Non-contact measurement Design goals: small and low power Existing IR design Non-contact measurement Design goals: small and low power 1.6 mm x 1.6 mm: 95% smaller than existing solutions Draws 90% less power than the competition 240 uA quiescent current 1 uA in shutdown mode http://www.ti.com/product/tmp006&DCMP=hpa-tmp-tmp006&HQS=Other+BA+tmp006-b Texas Instruments TMP006

Temperature Additional specifications Temperature range: -40°C to +125°C Local sensor accuracy: +/- 0.5°C (typical) Passive IR sensor accuracy: +/- 1°C (typical) Digital solution I2C/SMBus digital interface http://www.ti.com/product/tmp006&DCMP=hpa-tmp-tmp006&HQS=Other+BA+tmp006-b

Temperature Integrates 5 discrete components: 1 MEMS thermopile sensor 2 Signal conditioning 3 16-bit ADC 4 Local temperature sensor 5 Voltage references http://www.ti.com/product/tmp006&DCMP=hpa-tmp-tmp006&HQS=Other+BA+tmp006-b

Proximity Sensor Semtech The SX9300 is the world’s first dual-channel capacitive Specific Absorption Rate (SAR) controller that accurately discriminates between an inanimate object and human body proximity. http://www.semtech.com/touch-interface/capacitive-touch-controllers/sx9300/

Proximity Sensor Semtech SX9300 20mm detection distance 400kHz I2C Serial Interface Automatic Calibration 3 x 3mm Thin QFN package http://www.semtech.com/touch-interface/capacitive-touch-controllers/sx9300/

Application Specific Example: Tire Pressure Monitoring System Pressure and temperature sensors X- and Z-axis accelerometers RF Transmitter 315/434 MHz PLL-based RF transmitter MCU 8-bit S08 core MCU 16 KB flash 512B RAM

Application Specific Example: TPMS http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPXY8300

Accelerometer Integration of: 3-axis MEMS accelerometer 32-bit embedded ColdFire microcontroller Flash memory Dedicated architecture to manage other sensors http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA9550L&fsrch=1&sr=2

Accelerometer http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA9550L&fsrch=1&sr=2

Gyroscope STMicroelectronics L3G4IS a global dual-core, 3-axis gyroscope capable of handling both user-motion recognition and camera image stabilization Three selectable full-scales (250/500/2000 dps) for gaming applications Embeds a temperature sensor 4x4x1 mm package http://www.st.com/internet/analog/product/253096.jsp http://www.st.com/internet/com/press_release/p3260.jsp

Gyroscope STMicroelectronics L3G4IS Includes power-down and sleep modes Embedded FIFO (first-in first-out) memory block for smarter power management. http://www.st.com/internet/analog/product/253096.jsp http://www.st.com/internet/com/press_release/p3260.jsp

Accelerometer & Magnetometer Kionix KMX61G High performance accelerometer-magnetometer sensor With integrated sensor fusion software Emulated gyro outputs with up to 14-bit resolution

Accelerometer & Magnetometer Kionix KMX61G 3x3x0.9mm package size User-programmable ±2g/±4g/±8g full-scale accelerometer range ±1200μT total magnetometer measurement range Avoids the power consumption of gyro (550μA) http://www.kionix.com/sites/default/files/Kionix%20Announces%20Breakthrough%20Micro-Amp%20Magnetic%20Gyro%20Solution.pdf

InvenSense MPU-9250 9-axis MotionTracking device 3x3x1mm QFN package System in Package (SiP) Combines MPU-6500 that contains a 3-axis gyroscope, a 3-axis accelerometer, and an onboard Digital Motion Processor (DMP) capable of processing complex MotionFusion algorithms AK8963 3-axis digital compass. http://www.invensense.com/mems/gyro/mpu9250.html

What can we expect? What can sensor suppliers cram into a 3 x3 mm footprint? A 2 x 2- mm footprint? Certainly more software

Summary Presented 8 Smart Sensors Sensor with integrated MCU plus All include extra systems aspects All plug into a digital system Software is either integrated or part of suppliers’ total system approach

Topics Covered This Week Monday Basics of sensor compensation for piezoresistive sensors Tuesday Basics of Sensor Compensation for Capacitive Sensors Wednesday A case study of smart sensor development Thursday Transitioning from analog sensing to the digital control world Friday Today’s smart sensors