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Questions tagged [mems]

Microelectromechanical systems (MEMS) are very small electromechanical devices. Common devices made using the technology include accelerometers, gyroscopes and microphones.

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Should I use a metallic enclosure for my low-noise circuit?

I am trying to design an ultra-low-noise pre-amplification stage for a MEMS. The amplification consists of a non-inverting amplifier specifically chosen to have less than 4 nV/sqrt(Hz) as input ...
jrad's user avatar
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Who is the manufacturer of the Y31 5133 mic?

My question is in this PCBA I need the information of the who is the manufacturers of the mic the full details of that mic...
Naga 's user avatar
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1 answer
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How to calculate decibel from digital MEMS microphone

I built 3x3 microphone array using ICS-52000 MEMS microphones and Teensy 4.1 MCU to get data from those mics. I also wrote code in MATLAB to get data via serial port from Teensy. ICS-52000 are 24 bit ...
erysvh's user avatar
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Why different noise terms are read at specific sampling interval in Allan Variance plot?

I was trying to identify Quantization Noise, Angle Random Walk, Bias Instability, and Rate Random Walk from Allan Variance plot which as Allan deviation on y axis and Sampling Time Interval ...
Mahesha999's user avatar
1 vote
5 answers
197 views

Clock Signal over long distance

I'm building microphone array using 16 ICS-52000 MEMS microphones and I propably have problem with clock singal because of the long distance. Below is output signal of the 8 microphone I have already ...
erysvh's user avatar
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3 votes
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Weird behavior with SCK signal on breadboard

I'm working on my microphone array and I have problem with signal. I'm using 16 microphones adn Teensy 4.1 MCU and breadboard to connect everything. I also designed PCB for MEMS microphones ICS-52000. ...
erysvh's user avatar
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2 answers
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MEMS Microphone Convert V to dBV

At first is sampled data from the IMP23ABSU MEMS mic converted to V by multiplying each sample by the conversion factor \$ \frac{1}{32786} \$. Then i want to calculate the FFT and PSD after applying a ...
Tom's user avatar
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6 votes
5 answers
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Why do metal finders not use any sensors other than search coils?

I was wondering why metal finders do not use any other sensors to recieve the magnetic signal instead of search coils. I have been looking at MEMS sensors used as digital compasses, for example. As ...
Ron Vaisman's user avatar
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MEMS Oscillator Simulation in LTSPICE

The MEMS oscillator topology i simulate is below fig1: Oscillator schematic Source: A Tunable-Gain Transimpedance Amplifier for CMOS-MEMS Resonators Characterization Below is mine, the resonator i am ...
Jack Huang's user avatar
2 votes
2 answers
302 views

How to remove Earth's gravity DC component from accelerometer readings?

I am programming LIS2DE12 and IIM-42352 accelerometers in C and want to register movement of an object, for this I need to take values and compare them with pre set threshold values. But the problem ...
Dominykas's user avatar
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18 votes
2 answers
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Why is a MEMS device affected by helium but not hydrogen?

It seems that MEMS is very sensitive to helium, but only helium. This Link stated that hydrogen does not affect MEMS, which surprised me. Does anybody know why it's just helium, or what's really going ...
MicroservicesOnDDD's user avatar
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Can I power 3.3V to MEMS mic which is TYP=1.8V?

I am reading this datasheet. I have 3.3V for MCU and running out of space in the PCB area. So I want to avoid adding LDO for 1.8V. In the datasheet, it said ...
thankyounaly's user avatar
4 votes
1 answer
107 views

What is causing the digital output of my MEMS pressure sensor to decrement continuously?

I'm a lowly mechanical engineer so bear with me. This problem has been the bane of my existence. I'm using a temperature-compensated barometric pressure sensor in a fluid-contacting application. ...
mere engineer's user avatar
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0 answers
113 views

External synchronization of a AD MEMS acceleration sensor (ADXL355)

sadly, the AD help page was not very helpful therefore I'm posting here with the hope that the collective intelligence here can help me with my problem. I'm struggling with the external ...
Steradiant's user avatar
2 votes
1 answer
97 views

How do I connect the CS pin on an ILPS22QS sensor to enable I2C?

Should I connect the CS pin on an ILPS22QS sensor to enable I2C? In order to enable the I2C interface, on page 25 of the datasheet it says that the CS pin of SPI must be tied high by connecting it to ...
Idix's user avatar
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2 votes
1 answer
74 views

What is the point of the connection to ground, with resistor, on the inverting output of this MEMS microphone?

For reference, the datasheet I am referring to in this post is given by this. I was wondering whether anyone could clarify the point of connecting the inverting channel of the succeeding stages of the ...
Callous Derpallous's user avatar
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ZL30251 phase aligned

I just want to confirm whether the part zl30251 has phase aligned outputs? If not, can it be aligned? Also, I can confirm that both the outputs are LVCMOS. Can you please help me with this? Also, i ...
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1 vote
1 answer
185 views

Where do you need high frequency switching of high AC-currents?

Is there any application or piece of electronics that requires high frequency switching of high AC-currents? Due to the (high) AC-current, application of a transistor would be discouraged while the ...
Alon's user avatar
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Load capacitance of mems oscillator [duplicate]

I am using 88E1512-A0-NNP2I000 in my design. It requires 25MHz clock signal on its XTAL_IN pin. I will be providing the required 25MHz clock using ASTMLPE-18-25.000MHZ-ER-ET. In the datasheet of ...
MightyBeard007's user avatar
2 votes
2 answers
1k views

What is the correct maximum sample rate for the MPU-6500? Most of the internet says 32kHz, the datasheets say this isn't likely

The MPU-6500 is an IMU IC from InvenSense/TDK that superseded the (legendary, by now) MPU-6050 IMU IC. Supposedly, the major performance improvement was that it has a sample rate of 32k samples a ...
Charlie's user avatar
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How to get audio frequencies from mems microphone in PC oscilloscope

I'm fairly new to electronics/signal processing and I'm stuck on trying to obtain frequencies from an Adafruit SPW2430 MEMS microphone. I tried plugging the microphone to a Hantek 6022BE PC ...
felicianomiro's user avatar
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2 answers
111 views

Simple data over sound solution

I'm designing an access control and I'm evaluating different technologies to make the device unlock the access. One of the technologies I'm studying is integrating a microphpone in the device and ...
LazyTurtle's user avatar
3 votes
1 answer
505 views

ADXL345 Accelerometer data rate vs bandwidth

I recently started working with the ADXL345 Accelerometer and got a bit confused on what's the difference between the data rate and bandwidth. From the ADXL345 datasheet p14, we can see the different ...
B.Adlane's user avatar
1 vote
0 answers
196 views

I2S slave communication without an MCU - how to generate the clocks?

I am designing an audio amplifier circuit which uses an I2S digital MEMS mic (INMP441) for picking up voice signals and an I2S class-D amplifier (MAX98357A) for amplification. I have attached the ...
Sri's user avatar
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5 votes
3 answers
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I2S communication

I am designing an audio amplifier circuit which consists of an I2S digital MEMS mic (INMP441) for picking up voice signals and an I2S class-D amplifier (MAX98357A) for amplification. Both these ICs ...
Sri's user avatar
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1 vote
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What generates the torque to rotate this micromirror around the _vertical_ axis?

I can see current in the coil could interact with a magnetic field could cause the coil to rotate around the horizontal axis (flexures 310 and 312), but what forces are making the inner micromirror ...
bigjosh's user avatar
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2 answers
441 views

Which is the best sensor to detect accident in a vehicle eg. A car?

I did some research on this and came across MEMS sensors, there were quite a lot of them, but most of them acted as a gyroscope which would give output for left-right front-back tilts. I want an ...
Abhiraj Pillai's user avatar
1 vote
1 answer
120 views

System being subject to vibrations and G-forces : Crystal Oscillator or MEMS?

I'm planning on making an audio system that will be used in vibration-inducing environments (roller coaster rides that can reach up to 5/6G peaks and public transportation systems). One of its ...
DashNode's user avatar
1 vote
2 answers
671 views

MPU9250 Gyro Calibration-Offset

I'm working with mpu9250 gyroscope and I got fine measurements for beginning period (few minutes). I calculated offset at start in manner to average sum of first 1000 results from mpu9250 gyro. But If ...
subavet995's user avatar
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Durability of SMD MEMS pressure sensors in pure oxygen enviroment

I have a question regarding durability/reliability of COTS SMD mems pressure sensors in oxygen rich (basically 100%) atmosphere under pressure of 1bar/1atm and temperature around 20C/293K. Sensor ...
Felix's user avatar
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0 votes
3 answers
100 views

What do these question marks next to heater resistance mean?

This is from a sensor called MQ306A used for sensing gas. My problem is that this same series of sensors from the MQ category have the same tin dioxide layer but they claim to sense various gases. How ...
Shridhar Sharma's user avatar
6 votes
6 answers
1k views

Do MEMS accelerometers have a lower frequency limit?

Being a higher level programmer by education I have no deeper knowledge of electronics and electromechanics, so feel no obligation to answer this. I'm wondering about MEMS accelerometers. I heard a ...
user2878064's user avatar
1 vote
1 answer
66 views

Si5350 Driven by MEMS oscillator

I'd like to drive an Si5350 with a MEMS oscillator instead of a crystal for environmental robustness purposes. The Si5350 FAQ says that a CMOS input may be used instead of a crystal so long as the ...
KyleG's user avatar
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0 answers
204 views

STM32 MEMS microphone - weird output

I have an STM32f407vgt development board that has a MEMS microphone (MP45DT02) on it. I aim to take processable data from this microphone. STM32 provides PDMtoPCM conversion library and I2S ...
emre iris's user avatar
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0 votes
2 answers
237 views

How to convert pixel map to voltage/angles?

My end goal is trying to get something rendered using lasers and a MEMS scanning mirror. There are not that many resources online for this, but it seems like the basic idea is pretty applicable to ...
joethemow's user avatar
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1 vote
1 answer
272 views

Signal conditioning of the acceleration data from the ADXL 354

My project consists of the detection of a leak in a pipe using the vibration methode. I am using the MEMS accelerometer ADXL354. I selected the +/- 2g range. My problem is that the static acceleration ...
assia_sia's user avatar
0 votes
1 answer
83 views

How are objects rendered with a MEMS mirror for AR?

This question is an intersection of both hardware and software. I am trying to understand the theory of AR technology, but hitting some roadblocks and cannot find any good online resources that talk ...
joethemow's user avatar
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0 votes
1 answer
44 views

What changes when you modify gyro/accelerometer/magnetometer range?

In hobby-grade MEMS IMUs and MARGS such as MPU-6050, you can change certain registers on the chip and modify the sensor's range. For example 2 g or 8 g for an accelerometer. Of course, because the ADC ...
m278's user avatar
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0 answers
48 views

Frequency response of accelerometer MMA7361L

In order to create the model of the MEMS accelerometer MMA7361L I'm going to need the frequency response of it, but I don't have access to the university lab to use the oscilloscope because of the ...
assia_sia's user avatar
0 votes
1 answer
99 views

What is the output voltage and current necessary to operate the MEMS mirror?

I am trying to develop a driver to control a MEMS mirror by Mirrorcle. The specific component is A8L2.2-5000AU-TINY48.4. The data sheet only includes VdifferenceMax and and frequency information, but ...
joethemow's user avatar
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0 votes
1 answer
1k views

What does ST mean with "Temperature Offset" for the temperature sensor in their IMUs?

When reading the datasheet of the LSM6DSO32 IMU I noticed on p. 29 the characteristics of the integrated temperature sensor (see screenshot below): The sensor gives a digital reading of 0 for a ...
jusaca's user avatar
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0 votes
2 answers
161 views

Pressure sensor without using MEMS chips [closed]

I'd like to figure out how to make a pressure sensor for very low cost (essentially disposable), mass produced piece of medical equipment. The problem: this can't use any parts which aren't already ...
Alex I's user avatar
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0 votes
2 answers
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Is it possible to set up multiple wake up interrupts on STM32. ? How to manage multiple sensor reading intervals?

I am new to developing applications on STM32 development boards. Currently i have STM32 IoT discovery kit. I am able to configure all the sensors and read data. I am interested in low power design ...
user200's user avatar
3 votes
5 answers
517 views

Considerations for transmitting the signal from a MEMS microphone over a short cable?

In my application I have the signals from 6 analog MEMS microphones (CUI Devices CMM-3729AT-42108-TR), each amplified by a pair of op-amps in a voltage follower -> inverting amp configuration. The ...
Ben S.'s user avatar
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1 vote
1 answer
256 views

How can I add (kHz to MHz) high voltage signal to a high voltage DC offset?

I am working with MEMS structures and need to move a device (switch) in a operating point with quite high offset. (150V DC offset and a voltage swing of 60V) To generate the high HF Voltage (up to ...
gyger's user avatar
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0 answers
281 views

Capacitance calculation of comb-drive actuator

I just want to make sure that I am performing this calculation correctly... From this COMSOL study, I gathered the following info... $$C_t = N\frac{\varepsilon_o\varepsilon_rl_ot}{d}$$ $$C_f = \...
Landon's user avatar
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1 answer
342 views

LSM303CTR 3-wire SPI and I2C - conceptual problem

I'm trying to interface LSM303CTR e-compass from ST-microelectronics with microcontroler. Due to design limitations I have to use 4-wire SPI. This MEMS device has option to switch beetween 3-wire ...
Felix's user avatar
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1 vote
2 answers
233 views

MEMS Oscillator not running, why?

For the latest iteration of my prototype, I replaced a quartz oscillator with (what I thought would be) a drop-in MEMS replacement: the DSC6013CI2A-033.0000. It is suppling a 33 MHz clock to a TLC5955 ...
Tim Walther's user avatar
9 votes
2 answers
1k views

Why are MEMS in QFN packages?

I've seen that many (if not all of them) MEMS, like accelerometers, they are only available in QFN packages. Why is that?
MrBit's user avatar
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1 vote
2 answers
290 views

How is Gyro drift error related to error in velocity and position?

While reading about IMU on wikipedia I found this about its disadvantages: "A constant error in attitude rate (gyro) results in a quadratic error in velocity and a cubic error growth in position." ...
alt-rose's user avatar
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