St Microelectronics 3 Axis Digital Accelerometer Solution Download |VERIFIED|
Sharmaine Kachmar
Looking for an extremely accurate way to detect motion utilizing AI? We've got you covered with the Qwiic-enabled, SparkFun LSM6DSV16X 6DoF IMU Breakout. The LSM6DSV16X, from STMicroelectronics, is a high-performance, low-power 6-axis IMU, featuring a 3-axis digital accelerometer, and a 3-axis digital gyroscope, with a triple core for processing acceleration and angular rate data on three separate channels (user interface, OIS, and EIS) with dedicated configuration, processing, and filtering. All this functionality comes in our standard 1in. x 1in. Qwiic form factor and will seamlessly integrate into your Qwiic-based projects. However, we still routed the I2C signals out to a set of 0.1in.-spaced pins for users who prefer a soldered connection.
For both multi-chip solutions and SoC solutions, numerous technological schemes have been proposed, and the research community and industry continue to develop new manufacturing and integration schemes at a rapid pace. Each of the two basic methods of combining MEMS and ICs offers distinct advantages and disadvantages, and the preferred solution depends strongly on the device, the field of application and the product requirements. Based on recent MEMS market studies4,5, we estimate that approximately half of all existing MEMS products (in terms of market value) are currently implemented as multi-chip solutions (including many accelerometers, gyroscopes, microphones, pressure sensors, RF MEMS and microfluidic devices) and that the other half are implemented as SoC solutions (including digital mirror devices, infrared bolometer arrays, inkjet printheads, and certain gyroscopes, accelerometers and pressure sensors). Many of the MEMS products that are implemented as SoC solutions have the common feature that they consist of large transducer arrays in which each transducer is operated individually, and thus, the integration of each MEMS transducer and its associated IC on a single chip is the only practical way to implement these types of systems. However, there are also other products, including certain gyroscopes, accelerometers, microphones and pressure sensors, that are implemented as SoC solutions. The commonality among these products is that they are relatively mature products that are manufactured and sold in very high volumes.
st microelectronics 3 axis digital accelerometer solution download
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(a) System-in-package solution constructed via 3D stacking with wire bonded interconnects. (b) SEM image of a decapsulated STMicroelectronics LIS331DLH 3-axis accelerometer (STMicroelectronics, Geneva, Switzerland). An ASIC chip is stacked on an encapsulated MEMS chip and interconnected via wire bonds. Package dimensions: 3 3 1 mm3. From Ref 54.
(a) Chip-scale package (CSP): the MEMS and IC chips are attached via face-to-face flip-chip bonding. (b) Photograph of a 3-axis accelerometer (VTI, CMA 3000) fabricated using chip-on-MEMS technology. Package dimensions: 2 2 1 mm3. From Ref 61.
Example of heterogeneous MEMS and IC integration with via formation after bonding: (a) Individual fabrication of the IC wafer and the handle wafer, which contains a monocrystalline silicon MEMS device layer (e.g., an SOI wafer). (b) Wafer bonding using an intermediate adhesive layer. (c) Sacrificial dissolution or release of the handle wafer. (d) Patterning of the monocrystalline silicon. (e) Via-hole etching and via formation. (f) Sacrificial etching of the intermediate adhesive layer. (g) Design based on via-last heterogeneous MEMS and IC integration for accelerometers distributed by mCube in the USA (manufactured by TSMC Ltd.) and (h) SEM image of an mCube accelerometer. From Ref 142. SEM images of (i) a 1-megapixel monocrystalline silicon mirror array on CMOS driving electronics and (j) a packaged micro-mirror array. From Ref 143.
In summary, future developments in multi-chip and SoC solutions are converging towards higher MEMS and IC integration densities and, thus, smaller and cheaper components. A clear trend that is evident in MEMS sensor components is the integration of several sensing functions (e.g., multi-axis inertial and magnetic field sensing) in a single module, together with specialized processing functions for the sensor signals. These pre-processed and robust (often digital) sensor signals can be interfaced with high-performance processing units for advanced signal processing and the fusion of signals from various sensor elements.
STMicroelectronics ISM330IS and ISN330ISN iNEMO Inertial Modules are a system-in-package combining a 3-axis digital accelerometer and a 3-axis digital gyroscope. This integrated solution boosts performance at 0.59mA in high-performance mode and enables always-on low-power features for optimal motion results in industrial and IoT applications.
STMicroelectronics LSM6DSV16X iNEMO Inertial Module is a 3-axis digital accelerometer and a 3-axis digital gyroscope. The LSM6DSV16X has a triple core for processing acceleration and angular rate data on three separate channels. It has dedicated configuration, processing, and filtering. The LSM6DSV16X boosts performance at 0.65mA in high-performance mode and enables always-on low-power features for an optimal motion experience for the consumer.
The resonant frequency and modal response of the sensor were analyzed by finite element simulation (FEM); the analysis results by ANSYS are shown in Figure 5 and Table 2. Figure 4a shows the first mode in the working mode of the accelerometer; the resonant frequency was 979.08 Hz. Figure 4b shows the second mode, in which the proof mass rotates around a horizontal axis, and the resonant frequency was 1774.5 Hz. The third mode was the same as the second mode, only that the rotation axis was different, and the resonant frequency was also 1774.7 Hz, as shown in Figure 4c. Figure 4d shows the fourth mode in which the support beams vibrate, and the resonant frequency was 3069.8 Hz. The frequency of the interfering modes was far from the operating mode.
The tip shape is one of the main factors that affect the performance of the accelerometer, and the processes of the tip is also one of the key processes for the accelerometer. The silicon tip arrays are formed by wet etching with the HNA solution (HNO3, HF, and CH3COOH) and metalized by TiW/Au thin film; the morphology of the tip is an ideal pyramid, as shown in Figure 8.
The microsystem was designed for low bandwidth acceleration measurement, and in this preliminary assessment, only the DC acceleration response was experimentally verified. It was within the expected range and is unremarkable. Measurement results with each axis of the IMU accelerometer oriented normal to Earth gravity showed a rise to 1 g (9.81 m/s2) with the other two axes falling to 0 g.
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