BMI085

Bosch Sensortec BMI085 High-performance Inertial Measurement Unit (IMU) GENERAL DESCRIPTION BMI085 is a high-performance IMU specifically designed for Augmented/Virtual Reality (AR/VR) applications. The 6-axis IMU combines a 16-bit triaxial gyroscope and a 16-bit triaxial accelerometer in a miniature 3 x 4.5 x 0.95 mm3 (16-pin) LGA package and features low latency and high temperature stability. TECHNICAL SPECIFICATIONS BMI085 Technical data (Typical) Digital resolution Resolution BMI085 TARGET APPLICATIONS  AR/VR  High-end gaming/Handheld devices  Indoor navigation/Dead reckoning  Body/Human motion tracking Measurement range and sensitivity (calibrated)  HMI  Precise device orientation and tilt measurement  Platform stabilization (e.g. image, video, DSLR) Zero offset (typ. Over life-time) TCO SENSOR FEATURES The closed-loop gyroscope of BMI085 has an unmatched bias instability of less than 2°/h and low temperature coefficient of offset (TCO) below 15 mdps/K. The low-noise (120 µg/√Hz) and low-TCO (0.2 mg/K) accelerometer makes BMI085 a perfect choice for orientation tracking applications. BMI085 provides accurate and reliable 6-DoF motion tracking data even under demanding conditions, including environments where those conditions change, such as thermal effects like heating, typically encountered due to power dissipation in AR/VR head-mounted displays (HMDs). For AR/VR applications, BMI085 offers synchronized inertial data with a latency below 3 ms. This low latency allows to reduce the overall system (motion-to-photon) latency. In constantly changing conditions—for instance in HMDs under different CPU loads, worn, unworn—the excellent offset stability over temperature fluctuations of BMI085 is the basis for a truly immersive user experience. Due to low TCOs, low zero-g offset and excellent linearity, BMI085 also reduces the calibration effort at end-of-line testing of final devices. Accelerometer (A): 16 bit Gyroscope (G): 16-bit (A): 0.1 mg (G): 0.004 °/s (A) ±2 g: 16384 LSB/g ±4 g: 8192 LSB/g ±8 g: 4096 LSB/g ±16 g: 2048 LSB/g (G) ±125 °/s: 262.144 LSB/°/s ±250 °/s: 131.072 LSB/°/s ±500 °/s: 65.536 LSB/°/s ±1000 °/s: 32.768 LSB/°/s ±2000 °/s: 16.384 LSB/°/s (A): ± 20 mg (G): ± 1 °/s (A): ± 0.2 mg/K (G): ± 0.015 °/s/K Noise density (typ.) (A): 120 µg/√Hz (G): 0.014 °/s/√Hz Bandwidths (progr.) 5 Hz … 684 Hz Selectable output data rates Digital inputs/outputs 12.5 Hz … 2 kHz Supply voltage (VDD) 2.4 … 3.6 V I/0 supply voltage (VDDIO) Temperature range 1.2 … 3.6 V Current consumption (full operation) 5.15 mA LGA package 3 x 4.5 x 0.95mm³ SPI, I2C 4 x digital interrupts -40 … +85 °C Bosch Sensortec | BMI085 2|2 DATA SYNCHRONISATION BMI085 Pin configuration BMI085 is a system-in-package IMU that offers accurate acceleration and angular rate measurements. To achieve data synchronization on BMI085, the data ready interrupt signal from the gyroscope of the BMI085 needs to be connected to one of the interrupt pins of the BMI085 accelerometer, which can be configured as input pins. The internal signal processing unit of the accelerometer uses the data ready signal from the gyroscope to synchronize the data of the accelerometer, taking into consideration the group delay of the sensors. The accelerometer part then notifies the host of available data. With this technique, it is possible to achieve synchronized data and provide inertial data at an ODR of 2 kHz. SYSTEM COMPATIBILITY BMI085 has been designed for best possible fit into modern embedded CE devices. The sensor has very wide ranges for VDD and VDDIO supply voltages. The performance and current consumption are stable over the entire voltage supply range. BMI085 provides two digital serial interfaces: I2C and SPI. Pin description Pin No. Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 INT2 (Accelerometer) NC VDD GNDA CSB2 (Gyroscope) GNDIO PS SCx SDx SDO2 (Gyroscope) VDDIO INT3 (Gyroscope) INT4 (Gyroscope) CSB1 (Accelerometer) SDO1 (Accelerometer) 16 INT1 (Accelerometer) BMI085 is pin-to-pin compatible with the BMI055 Headquarters Bosch Sensortec GmbH Gerhard-Kindler-Strasse 9 72770 Reutlingen · Germany Telephone +49 7121 3535 900 Fax +49 7121 3535 909 www.bosch-sensortec.com Data & Specification are preliminary and subject to change without notice | | Bosch Sensortec GmbH reserves all rights in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the symbols are registered trademarks of Robert Bosch GmbH, Germany. Doc.-Number: BST-BMI085-FL0000 / Version_1.0_012018