MEMS (sensors)

I performed a temperature cycle check on the ASM330LHB chip. Relative to the warming process (red curve), during the cooling process (blue curve), it is prone to large zero-bias jumps (in the red box of the picture)。 The jump during the cooling process, I feel like there is a correction mechanism in the gyro in the chip, which recognizes a large shift in the gyro zero bias during the cooling process, and then immediately corrects the large zero bias shift.Can you please help explain what causes this?Note: These data on the image have been smoothed for 10 seconds. 

Datasheet 4.5 Maximum value for Symbol Vin in Absolute maximum ratings is 0.3 to Vdd_IO +0.3, should it be -0.3 to Vdd_IO +0.3?

In the datasheet of LSM6DSV80XTR maximum junction temperature is not mention. Maximum junction temperature is required to do the thermal calculation. please any guidance how to obtain the maximum junction temperature till which this IC can work safely. 

I ordered one of these evaluation boards (https://estore.st.com/en/steval-mic003v1-cpn.html) and by the time I got it and went back to check the documentation now this microphone, and all other MEMS mics, are listed as "Not Recommended for New Design". Couldn't find anything about these being discontinued on the news section of ST's website so I'm asking here if this is a website glitch or should I look for a different source? And if the latter, does anyone have a good line on something comparable to replace these in a design? https://estore.st.com/en/imp34dt05tr-cpn.html 

Hi, I am using the LSM6DSV16BX IMU on a project where I need the Game Rotation data.I used the Github examples as a base, and reading the Game Rotation values works well and I am able to save the quaternion data in a file. I wrote a little script that takes the Game Rotation quaternion values and applies the orientation to an object, to mimic what is possible in Unico GUI with STEVAL-MKI234, however I do not get the same performance with my custom board. For instance, I sometimes get some weird rotations around two axis even though I rotate the device around a single axis. See video:

Hello,Can the IMP23ABSUTR sensor go through a vapor phase oven?"Thx.  

We're looking to use the lsm6dsv320x in our product. I'm using this senser on the on the STEVAL-MKI247A adapter board for testing. We're currently in development using the adapter board with the Nordic nRF52840DK board. I'm having issues with getting the correct value from the WHO_AM_I with certain SPI pin configurations on the nRF52840DK. I can only get one SPI configuration to output the correct value of 0x73 which is SPI1. If I try change the pins or use one of the other SPI's available on the 52840, I consistently get a value of 0x64. Does that value mean anything to anyone? I've tried lowering the frequency to 500kHz, tried all four of SPI modes, I've tried performing a reset using the FUNC_CFG_ACCESS and CTRL3 registers before reading the WHO_AM_I register, but I still get the value of 0x64 except with the one configuration mentioned. I'm using the ST fsm_example for this test. We would like to change the SPI pins as the we want to use the smaller package of the nRF52840

MEMS studio is working perfect on windows 11 and another windows 10 machine. But it is not working on one windows 10 pro laptop. Kindly guide what can be the reasons.

I have bought a new eval board from semikart via aquatronics. The device mounted on dil 24 of mk1251 kit is lsm6dsv320. The whoamI address of the device is 0x73 but it was not coming when we integrate with nucleo board. So, I waited for eval kit IKS4A1 to double check which I had ordered on coming of eval mk1251. I got MEMS Studio running on a windows 11 machine. But when I opted for dil sensor lsm6dsv320 , it threw inconsistent whoAMI address error. I am trying to contact semikart and aquatronics from last 10 days but none of them are responding. kindly tell a way to correct it or replace the eval kit mk1251. 

Hi, Post-development testing of the acceleration sensor reveals that the collected XYZ axis values are inconsistent with the actual physical acceleration values, and one axis continuously outputs a value of 0.What is the specific corresponding relationship between the sensor’s feedback value and the actual physical value?I also hope you can provide relevant technical parameters (such as sensitivity, zero offset) and calculation formulas for reference, so as to help us troubleshoot the problem quickly.thank you!!

We have used LSM6DSOXTR and IIS2MDCTR for our boards and we require any kind of certification test reports or certifications if applicaple. Where can I find them.

Hello, the values of my accelerometer axes are affected by temperature changes and require calibration at each temperature. What method should be used for compensation? How can Bias Drift and Scale Factor Drift be determined each time the temperature changes?

Hi What is the function of the RES pins on the ASM330LHHX?The datasheet indicates: “Connect to VDDIO or GND.”Is there a preferred connection?Can I add a 4.7 kΩ pull-up or pull-down resistor?BR

Hi ST Community,I am encountering a specific issue with the LSM6DSO configured in FIFO Mode with the Sensor Hub (Master I2C) active.Hardware Setup:IMU: LSM6DSO (SPI to STM32).Slave Sensor: LIS2MDL Magnetometer connected to LSM6DSO via I2C (Sensor Hub mode).I2C Bus: Standard 100 kHz. External pull-up resistors are populated on the PCB (in addition to the internal ones enabled via configuration).Configuration:ACC ODR: 6667 Hz (High Performance).GYRO ODR: 6667 Hz (High Performance).MASTER_CONFIG: 0x4C (Write Once + Pull-Up Enabled + Master On).FIFO: Streaming Mode (storing Acc + Gyro + Slave0 Mag).The Issu

Case Description:Title: LSM6DSL FIFO data misalignment (XYZ rotated) and FIFO_PATTERN always 0 — how to align reads?Body:I’m using an LSM6DSL over I²C with an STM32. Goal: batch accelerometer-only samples into FIFO and drain clean (x,y,z) triplets at a fixed watermark. I keep running into two issues:Data misalignment — the XYZ triplets appear “rotated”. I’ll get a few normal lines, then a line where one column looks like a big random number (e.g., ~168xx), then it stabilizes again. Example:x,y,z 5, 250, 16870, 17, 258, 16825, -66, 221, 16828, -53, 284, 16834, Sampling End Sampling Start -22, 4, 242, 16846, 13, 281 16830, 51, 230 16882, 39, 242 16850, 11, 258 16803, -14, 220 1684

hi,     we use one LSM6DSL sensor to read 3 axis acc FIFO data each second, but after some times, the FIFO out data become misaligned. the sensor setting is below:XL_ODR_26HZGyro disabled.FIFO ODR = 26HzFIFO threshold (water mark) = 128No decimationBDU Block Update enabledFIFO Is in continuous modewe have a timer to trigger to read FIFO data by Zephyr I2C(frequency: 100000bits/s) each second, before data reading, we check the numbers of FIFO by checking FIFO_STATUS1 and FIFO_STATUS2 register, then we read a multiple of 3 axis sets each time, for example if the FIFO data number has 78, we will read all FIFO data one time, if the number is 76 or 77, we only read 75 data one time. it can make sure reading data is complete 3-axis dat

Now I am working on my own project which involve with detecting the pattern of hand gestures using LSM6DSOX. I planned to use decision tree to detect each gesture and use FSM to detect the sequence of gestures and send the interrupt signal.Now the project has 2 decision trees which detect different type of gesture. Both are working fine. In FSM, It program to detect 2 results from the decision tree. I use SETP command to change the DECTREE variable to check other decision tree address and value. But when upload the config, it doesn't work.I not sure that I am misunderstanding something about MEM_ADDR and MEM_VAL in SETP command, or my FSM has other issueThe picture attached is the FSM I use now for clarification. I want to check decision_tree_1 if the result is 4 first, then check decision_tree_0 if the result is 4.p.s. Actually, I have other question, how can I program the FSM to detect if the sensor is tilt and stay still for a

Hello,I can't find reference to the expected chip markings for the ISM330DLC and IIS2MDC in their respective datasheets. My PCB assembler is requesting this information to validate the components.Are these the correct markings?ISM330DLC: SY 203IIS2MDC: M Thank you in advance for your time and kind regards,

Hi,We are evaluating the LSM6DSR's noise floor for a specific use case. Based from the datasheet the noise is 60ug/sqrt(hz). So calculating the RMS noise at 208Hz should result to 0.00062 m/s^2 right? However, we are getting measured RMS values around 0.002 to 0.004 m/s^2. Here are some configurations setFS: +-2GODR: 208HzData acquired using FIFO reading every 500 samplesNo onboard filtering enabled. I have attached a sample dataset for your analysis as well.

Hi,We are using LSM6DSV320X for our product and want to generate interrupt when high-g is detected. In which register do we need to set the threshold so that the interrupt is generated at or above that value.

Hi,Does ST have any plans to manufacture FLIR (Forward Looking InfraRed) MEMS sensors in future?Will 

I am currently trying to build a motion detector like application using a LSM6DSV80x and it's MLC in combination with MEMS Studio (fw 2.2.0). To do so, I use the standard DataLogExtended firmware on a NUCLEO-F401RE and can successfully log and visualise data in MEMS-Studio. The MLC training can also be done successfully, and I can flash the MLC from MEMS Studio as well as use the Decision Tree Output Viewer.But then, when I want to tweak the parameters or understand what is going on, I am missing the MLC Debug Tab in MEMS Studio (as referred to in UM3233 (MLC section) completely and cannot test on already recorded data (see picture attached).So where can I find the Debug MLC Tab in MEMS Studio 2.2.0? If it was removed, which is the last MEMS Studio version that supports it?(Tested both on Mac and Windows -> same issue) 

Hello,I'm working with the Vibration Monitor use case available in the Example Apps of Steval SensorTile.Box MKSBOX1V1. I'm quite happy with how it works, but I would like to modify some parameters and here comes the problems (both modifying the already available apps and creating new ones from the scratch in the expert mode). The app consists of two steps, one creating the vibration profile of the monitored object (Vibration Monitor - Training) and the second finding the differences between the current vibration profile and the reference one to identify anomalous vibrations.If we give a look to the settings of this example app, which is correctly working, we can see among the the parameters of the Vibrometer Accelerometer Sensor that the Output Data Rate (ODR) is set to 6666Hz and by default it can stream data over Bluetooth (otherwise it would not work with the Android app, lighting on the virtual lamp when the Sensortile.Box vibrates). Howeve

I recently purchased a mini drone set (Steval Drone 02 & Steval FCU001/V2) and encountered several issues after mounting and starting up the FCU.I would like to share these problems in the hope of finding a solution. Firstly, during indoor flight, after calibration and arming the drone, it only flies up to about 20 cm and cannot be controlled.I have ensured that the propellers are mounted correctly.I noticed on the forum that I am not the first to experience this issue. Secondly, regarding the Android app, there should be a take-off button on the screen as mentioned in the Help section, but it does not exist.Could you please guide me on where to find the log data? Lastly, concerning the gyroscope and accelerometer.I have installed the TM32CubIDE and loaded the FCU001V2 project.After making some changes as per the manual, the elf file was created without errors.I loaded it on

Greetings,we are working on to evaluate the data given in lsm6dsv datasheet ,we want to verify the sensitivity and rest of the parameters,could you please provide us the test setup/suitable test rig details with which we can test the sensor...Thank you