MEMS (sensors)

I'm using a ​LSM6DS3TR-C and polling the status register to determine when the gyro or accelerometer have produced a new value. This works fine for the most part however, if the sensor is moved quickly, it locks up and the new data sample bits in the status register never go high again. Think the accelerometer bits are XLDA.​To get the sensor to work again, it needs to be powered down. Simply preforming a software reset is not enough. ​Any ideas what could cause this?

I would like to use the ISPU on the LSM6DSO16ISTR for signal processing of both the internal and a few external sensors. I'm having trouble finding any details on the ISPU itself. How about:Instruction set architecture Register fileBoot loaderClocking (how fast does it execute instructions?)Please point me to the technical documentation for this core.Thanks!

Is LIS2DH12TR / LIS3DHTR a 10-year commitment? How long does it live?

We have several units of LSM6DSL in the field and I was looking that this part has an embedded temperature sensor. I would like to understand better the accuracy of this sensor. The datasheet is not clear, showing only this information. Can I assume the operational range of this sensor is the same as the device (Top = -40~85ºC)?The datasheet says OFFSET -15/+15 ºC. Is this the accuracy of this sensor?  Since is 16bits for ADC resolution, the minimal step will be 1/256 ºC. And the range will read 25ºC +/- 127ºC?The AN5040 shows a table of example values 

Hello,I plan to use STEVAL-MKI109V3 with LSM6DSV16x. Assumed that I used Unico and collected data, and labelled them. How can I use my custom training in different MCU?Also, I need wireless communication instead of a USB Cable to collect my data. How can I merge BLE or another wireless communication module into this kit?

On the website, in the databrief it is not stated how to connect the jumpers on the steval-mki227ka, I would like to know how to enable SPI mode 1 on the evaluation kit for testing.The problem that I'm getting is that even reading the who am I address it gives back the wrong answer.All help will be appreciated.

Hello,I programmed the sensorTile STEVAL-STLKT0V1 with ALLMEMS1 end I used STM32CubeIDE with NUCLEO32. How I can change the sampling frequency (ODR) of accelerometers and gyroscopes?Thanks,Chiara

I'm designing production test for a board that integrates the LSM6DSM imu. I was wondering if it was necessary to do any calibration of the IMU during the test process or if the factory calibration is sufficient?

Hi everybody, I noticed that the accelerometric and gyroscopic signals are perturbed by an initial transient, like the one in the attached figure. What could be the issue?Thanks,Daniele

I have purchased the STEVAL-STLKT01V1 sensor tile development kit. I have plugged the sensor tile onto the Cradle Expansion board and connected the SWD cable to a Nucleo-F070RB development board. As a complete beginner I am struggling to understand how I am meant to code the sensor tile. Any advice/links on how to use it would be greatly appreciated.

Hello,I'm using the IMP34DT05 microphone using the I2S interface. I'm sampling at 22kHz but I have a problem when I look at the recording saved on micro SD. In the first part of the audio, I see a glitch and then an exponential decay of that spike (see attached image). The strange thing is that not all the recordings have such a glitch at 0.046 s, which is exactly after the first 512 Bytes (see second screenshot). The PDM data are converted to PCM using the PDMFilter function. Any suggestion on how to get rid of this? and the reason why is happening?

Hi, in my application I will not use INT2 pin. Is it okay to connect INT2 pin to the GND?

I am evaluating the LPS22HH for a product, but the device acts a bit unreliably. After power-on, sometimes the BOOT_ON bit in INT_SOURCE (24h) is never cleared.I wait for at least 500ms before checking the BOOT_ON bit, so that should be plenty of time for the pressure sensor to finish the boot phase. Repeated readings at the same interval show the bit is still set and never seems to be cleared.What could cause the device to get stuck in the boot phase?

I read document AN5209. This said " VDD must be lower than 0.2 V for at least 10 ms during power-off sequence for correct POR. (3.1 Figure 2)"If POR did not finish correctly, is there the possibility to be read the un-correct data?

Dear ST Hello,I am trying to use the ISM330DLC 3D accelerometer and gyroscope with the stm32F329Discovery board and I am facing some problems when I want to read and write all the registers every 10 ms ISR period.I want to try to change the registers every period without compiling in changing the code each time. I am doing this to have to calibrate the filters in real time. To do so I am defining all the registers in a header file. here is an example of the status register.#define ISM330DLC_STATUS_REG 0x1EU typedef volatile union { uint8_t All; struct { uint8_t XLDA :1; //Accelerometer new data available uint8_t GDA :1; //Gyroscope new data available uint8_t TDA :1; //Temperature new data available uint8_t Reserved :5; } ISM330DLC_RegBits; } Tun_Status_Reg;I am doing the same thing to all the registers and I am defining a union (buffer & struct) for all the ISM330DLC registers.typedef union { struct

I am trying understand the sampling rate of lis3mdl on the Z axis. The datasheet has only stated on setting the ODR of X and Y but not Z. Only the performance of Z can be set. During testing, I have noticed that the Z axis sampling rate is slower than X and Y. Could you provide more details regarding Z axis sampling frequency?

Dear ST,I am using the ISM330DLC gyro and accelerometer,In the electrical connection mode 1 I have a pin called VDDIO.In my application I connected this pin to 3V but, I don't have any idea what is the use of this pin?Thank you for explaining

I have a MMC5603NJ (i2c addr 0x30) connected to SDx and SCx on LSM6DSOX with INT2 pin grounded. I can see with logic analyzer I2C transactions on BOTH the Slave and Master interface, but every time I try to access a register in MMC5603 on Master bus I get a NAK, as if the LSM6DSOX is not letting the SDx pin go to float maybe? seems like it "should just work" i see all the slave I2c transactions mirrored on the master SDx and SCx pins exactly, just cannot access the other device on the master side of the LSM. I must be doing sometime (simple) wrong? Also .. how do you configure the "Modes" 1,2, on this chip? is it only by vitrue of the wiring ? thanks much

Hello,I am integrating multiple sensors from ST, all of which are connected to a central processor via I2C. Occasionally, I find that the LPS22HB is unresponsive at boot up. When the central processor attempts to read the WHO_AM_I register, there is no response. The other sensors work fine.I can reproduce this behavior somewhat reliably by configuring the main processor to read from the LPS22HB in rapid succession and then power cycling the entire device at random intervals. On some power cycles, everything works fine. On others, the LPS22HB appears unresponsive.What could prevent the LPS22HB from communicating via I2C? The following screenshot shows a logic capture (both digital and analog) of the problematic behavior:

I am bit-banging since my CPU doesn't have native SPI compatible with the LIS3DH.To initialize the chip, I write:0x57 to Control Register 1 (DATARATE_100HZ, XYZEN) {see pic CR1Write.jpg}0x80 to Control Register 4 (BLOCKDATAUPDATE, SCALE_2G) { see pic CR4Write.jpg}I then poll STATUS_REG_AUX to see if the ZYXDA (0x08) bit is set.The data ALWAYS comes back 0xFF, so my code proceeds to read 3 axis data since the test for 0x08 always comes back true {see pic AuxStatusRegRead.jpg}I then read the OUT_X_L register with the M/S bit SET, so that the address will increment with every additional 8 clocks I send out (total of 40 clocks beyond the initial 16). {see pic 3AxisDataRead.jpg}The data ALWAYS comes back the same no matter what the orientation of the device!I am at a loss, having spent WAY too much time trying to get this to make sense....Please help!

My application hopes to detect objects on a flat surface (e.g. table). I hope to place the VL53L1X in a vertical plane, close to the horizontal table top. Then I hope to be able to ignore reflections from the table itself by using the RoI feature. I hope to look for signals only from the "top" half of the 16x16 array - which I hope will be from objects present on top of the table, ignoring any reflections from the table itself.Q1. Is this a reasonable approach, and might it work?Q2. What is the orientation of the VL53L1X with respect to the RoI settings? Specifically, if I am running the VL53L1X GUI program and set RoI Left=0, RoI Right=15, RoI Bottom = 8, RoI Top=15, then how should I orient the VL53L1X sensor to observe only objects located above a horizontal table?(Documentation, including AN5191, does not seem to address the question of "what is up").

Dear ST hello,I have a question about the bit field,I am using the stm32F429 discovery board, and I am working on the gyroscope Mems.if I declare a union like this:typedef volatile union { uint8_t All; struct { uint8_t Yen:1; /*X axis enable*/ uint8_t Xen:1; /*Y axis enable*/ uint8_t Zen:1; /*Z axis enable*/ uint8_t PD:1; /*Power-down mode enable*/ uint8_t BW0:1; uint8_t BW1:1; /*Bandwidth selection*/ uint8_t DR0:1; uint8_t DR1:1; /*Output data rate selection*/ } RegBits;   } Tst_CTRL_REG1;How does the compile organize the bits in memory?Does the MSB is Yen or DR1?Thank you in advance,

I have the STEVAL-MKI224V1A with the LPS22DF pressure sensor. This is attached to a STEVAL-MKI109V3 motherboard.I downloaded and installed the UNICO GUI version 9.14.6.0 The GUI app opens as expected and I select the "Environmental Sensors" on the left list.Then I select the "STEVAL-MKI224V1 (LPS22DF)" from the right list.The MKI109V3 with USB cable is plugged in to the PC and a green LED is blinking at a ~1/sec rate. Also, there is a steady blue LED on the motherboard.After clicking, I immediately get an error dialog that says:Error: Communication with the motherboard failed.Please check the motherboard is connected properly.I have not changed any of the jumpers on the motherboard.Any ideas on how to proceed?

Dear Sir,​Here set XL ODR = 104 Hz and Gyro ODR = 104Hz, routing XL data-ready to INT1, Gyro data-ready to INT2, respectively.Interrupt mode is set to pulse mode here.Do reading XL register and gyro register on INT1 and INT2 for clearing data-ready interrupt event, respectively.After registers are programmed, use scope to view the waveform.Except the 1st XL interrupt, the span between remainding adjacent interrupt is about 9ms, is approximately to XL ODR 104Hz, as expected.(see Fig.2)Why the span between 1st XL interrupt and 2nd XL interrupt is weird? it is about 4.3ms (see Fig.1)Yellow channel(channel 1) is XL interruptBlue channel(channel 2) is Gyro interrupt​

Hi all!I have a problem with transmition/receiving more than 8 bytes of data between two STM32 MCUs via CAN-Network.I know, it is impossible to transmit more than 8 bytes of data via basic CAN Bus.I tried to create Command messages System.CAN Master transmit to CAN Slave command message "RT" (aka "Read Temperatures") and CAN Slave reply 'T' and 7 bytes of data with Temperature values. At that level it is all fine. CAN Master transmitting and then receiving the values. Then CAN Master transmits next command message"RP" (aka "Read Pressures") and CAN Slave reply 'P' and 7 bytes of data with Pressure Values. CAN Master, continuously transmitting each command after receiving values from previous command.At that point starts the problem.The values are overlapping with each other.I have a question, is anybody had experience with transmitting/receiving more than 8 bytes of data via basic CAN Bus? Is ther