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EETE DECEMBER 2012

Top and bottom port silicon MEMS microphones Signal conditioning ASIC with matching frequency responses targets MEMS gyroscopes Wolfson Microelectronics has released the WM7121 and Si-Ware Systems has developed and is supplying a high WM7132 high performance top and bottom port silicon performance conditioning ASIC for Tronics’ new GYPRO2300 analogue micro-electro-mechanical systems (MEMS) micro- gyroscope. The SWS conditioning ASIC along with Tronics’ phones with matching fre- MEMS element produces a gyroscope that has best in class quency responses. With a performance when compared with other gyroscopes in the mar- high signal-to-noise ratio ket today, claims the company. The GYRPO2300 has a bias in- (SNR) of 65dB, ultra-low stability (Allen variance) of 1 degree per hour, an ultra-low noise distortion and matching density of 10o/h/Sqrt(Hz), and an excellent thermal bias stability responses across the fre- of +/- 0.05 degrees per second. SWS supported Tronics in the quency band from 10Hz characterization of its MEMS gyroscope, which was enabled to 20kHz, the WM7121 through SWS’s MEMS development platforms. SWS also and the WM7132 deliver worked closely with Tronics on the integration and industrializi- superior HD Audio quality and highly authentic audio record- ation of the gyroscope module. Earlier this year SWS launched ings for a wide variety of portable applications. As well as its SWS61111 Inertial Sensor Development Platform, which their matching frequency responses, the microphones also enables companies themselves to characterize their MEMS feature matching phase responses and matching sensitivity, sensors at an early stage. The SWS61111 utilizes SWS’s high making them suitable for stereo recording and much easier performance inertial sensor interface ASIC, the SWS1110. The for designers to integrate into their systems. Both devices SWS1110 is a highly configurable ASIC that can be interfaced are also available with market-leading sensitivity tolerance of with accelerometers and gyroscopes in open- and closed-loop ±1dB. The WM7121 and WM7132 both incorporate Wolf- (force-feedback) operation. son’s proprietary CMOS / MEMS membrane technology, Si-Ware Systems offering high reliability and high performance in a miniature, www.si-ware.com low profile package. Both parts are designed to withstand the high temperatures associated with automated flow solder 9-axis MEMS sensor combines accelerometer, assembly processes, which can often damage conventional microphones, making them ideal for high volume manufac- gyroscope and geomagnetic sensor turing. The WM7121 top port package and WM7132 bottom Bosch Sensortec is sampling the absolute orientation sensor port package are both available for sampling now. BMX055, the first 9-axis sensor in the market with all compo- Wolfson Microelectronics nents – accelerometer, gyroscope and geomagnetic sensor www.wolfsonmicro.com in a 3.0x4.5x0.95mm 20- pin LGA package. The BMX055 contains three MEMS barometric capacitive pressure sensor highly accurate and ver- satile 3-axis sensors: a delivers 10cm of altitude resolution 12-bit low-noise acceler- An affiliated company of Theon Sensors, European Sensors ometer, a gyroscope with Systems (ESS) has released a MEMS-based capacitive baro- a resolution of 16 bit and metric pressure sensor enabling portable devices to navigate programmable measure- with an altitude resolution of ment ranges, and a low 10cm. The ESCP2-002 sen- noise, wide-range geomagnetic sensor optimized for the best sor relies on ESS’/THEON’s performance / power consumption ratio. With these devices, innovative surface micro-ma- the absolute orientation sensor BMX055 provides accurate chining SOI technology and acceleration, angular rate and geomagnetic measurement integrates a high resolution data. The BMX055 is fully supported by Bosch Sensortec’s Delta-Sigma ADC to digitize sensor fusion software FusionLib which combines the sensor the signal and a low phase data outputs and generates robust virtual sensor outputs noise oscillator. The digital such as quaternion, linear acceleration, rotation, gravity. This output is fully calibrated enables developers to quickly create advanced solutions and temperature compen- with comprehensive 9-axis functionality. The accelerometer sated based on the internal unit of the BMX055 offers a selection of g-ranges from ±2 to temperature sensor and the factory calibration coefficients are ±16g with a sensitivity of 1024 to 128 LSB/g. It excels with a stored in an embedded memory. Designed with SPI and I2C noise density of 150µg/√Hz. The gyroscope features a wide interfaces, the sensor can be readily integrated in end user sys- measurement range with angular rates between ±125°/s tems. Different power modes are available enabling low power and ±2000°/s. At the same time it offers a very stable zero- operation, while the output rate and thus the conversion speed rate offset temperature behavior. The geomagnetic sen- is programmable, allowing the end user to customize perfor- sor is characterized through a wide measurement range of mance. Special functionalities like alarms are also available. ±1300µT in x and y axis and ±2500µT in z axis. Heading The sensor provides a digital high accuracy 32-bit pressure and accuracy is 2.5°. temperature output. raw analog outputs are also available. Bosch Sensortec Theon www.bosch-sensortec.com www.theon.com www.electronics-eetimes.com Electronic Engineering Times Europe December 2012 39


EETE DECEMBER 2012
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