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EETE JULAUG 2014

Bosch reduces size, power of 6-axis IMU Bosch Sensortec has taken the power consumption of an inertial measurement unit below 1mA with a view to gaining design wins in wearable equipment. Bosch Sensortec has produced a 6-axis inertial measurement unit (IMU) that consumes less than 1mA and has a packaged size of 2.5mm by 3.0mm by 0.8 mm. This compares with Bosch’s BMI055 which consumes more than 5mA and has a package size of 3mm by 4.5mm by 0.95mm. BMI160 Inertial Measurement Unit (IMU) integrates a 16-bit 3-axis, low-g accelerometer and a 3-axis gyroscope and has been designed for always-on 6-axis and 9-axis applications in smart phones, tablets, wearable devices, remote controls, game controllers, head-mounted devices and toys. It can also serve as an input to 9-axis sensor fusion computation. The part is available in a 14-pin 2.5×3.0×0.8mm3 LGA package. When the accelerometer and gyroscope are in full operation mode, the typical current consumption is 950μA, best in class by a factor of two, Bosch claims. The BMI160 can use an external geomagnetic sensor to synchronize the inertial accelerometer and gyroscope sensor data for applications requiring exact, low latency 9-axis sensor data fusion. Additional sensors such as geomagnetic or pressure sensors can be connected as slaves via a secondary I2C interface. In this configuration, the BMI160 controls data acquisition of the external sensor with all sensor data being stored in the BMI160’s built-in FIFO. Bosch Sensortec www.bosch.com Accurate automotive, 3-axis digital-output gyroscope The MAX21001 is a low-power, low-noise, automotive 3-axis angular rate sensor that, says Maxim Integrated, delivers new levels of accuracy and sensitivity over temperature and time, exhibiting high bias stability. The device operates with a supply voltage as low as 1.71V for minimum power consumption. It includes a sensing element and an IC interface that provides the measured angular rate to the external world through a digital interface (I2C/SPI). The IC has a full scale of ±31.25/±62.50/±125/±250/±500/±1k/± 2k degrees per second (dps) and measures rates with a finely tunable user-selectable bandwidth. The low short-time bias instability, the high stability over temperature, and the operational flexibility make the IC suitable for in-dash navigation systems. The IC is a highly integrated solution available in a compact 3x3x0.9mm plastic land grid array (LGA) package and does not require any external components other than supply bypass capacitors. It can operate over the -40°C to +85°C temperature range. Maxim Integrated www.maximintegrated.com Sensor system AFE improves road hazards detection TI’s AFE sensor technology for automotive radar applications, a quad-channel analogue front end, doubles sampling speed and reduces power more than 30%: TI positions it as the fastest and lowest power baseband receiver analogue front end (AFE) for ADAS applications. The 4-channel AFE5401- Q1 is designed for the next generation of automotive radar applications where space constraints and increasing radar performance are driving a need for greater bandwidth, high integration and low power. Delivering twice the sampling rate and bandwidth spectrum of existing solutions, the AFE5401- Q1 enables quick position and speed discrimination of even the fastest moving scenes. At 30% less power and 20% less board space it enables a small device for optimal in-car installation. The 25Msamples/s-per-channel sampling speed enables automotive radar designers to implement industryleading position and speed detection of fast-moving targets. The chip draws 65mW per channel, it comes in a 9x9mm, 64-pin QFN package. TI www.ti.com www.electronics-eetimes.com Electronic Engineering Times Europe July/August 2014 29


EETE JULAUG 2014
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