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blood pressure monitor portable Hi everyone, i am working with blood pressure monitor portable , I had finished analog circuit from sensor MPX5050 , then i want to test this circuit , but i don't have no idea , how to generate a blood pressure signal ! , can you help me ! Thanks , here is my ciruits Re: blood pressure monitor portable Hello a b, You’d need a blood pressure cuff. The pressure sensor would measure the pressure change in the cuff: http://flightphysical.com/images/bodyparts/blood-pressure-cuff.jpg In the above image you can see a blood pressure cuff with a mechanical pressure gauge, instead of that you would connect P1 of the MPX5050. Please take a look at “Ankle-Brachial Index” image in the following page for detailed information on using a blood pressure cuff: http://www.ehow.com/how_4425292_use-blood-pressure-cuff.html If you’re only simulating the circuit, you’d need to generate a signal like the one shown in the following page: http://www.biopac.ca/Continuous%20Non%20Invasive%20Blood%20Pressure.htm I’d recommend you to run some test in Matlab or Octave, you can generate such signal by adding sinusoidal signals of different frequencies. You could also download an artificial biomedical signal generator from the following page from OhioLINK ETD Center: http://etd.ohiolink.edu/view.cgi/Bhojwani%20Soniya%20Naresh.pdf?akron1193079604 Hope it helps! Josh Re: blood pressure monitor portable sorry ; i just want to test in software !

8452 vehicle motion Hi all, which is the best interrupt option/configuration using this sensor to quickly detect a vehicle (car) movement, without be sensitive to other vibrations (doors opening for example) ? I need to detect when the vehicle really start moving to generate an alarm. Accelerometers Re: 8452 vehicle motion Hello, I'm actually using this configuration to detect vehicle movement. Is there anything I can do to increase sensivity ? I'm trying to play with register without success $2A, [$18] ' 0x2A: CTRL_REG1 system control 1 register, Set device in 100Hz ODR, Standby $1D, [$1E] ' 0x1D: Transient_CFG register, enable latch, Enable XYZ $1F, [$01] ' 0x1F: TRANSIENT_THS register, set threshold to 1 counts $20, [$05] ' 0x20: TRANSIENT_COUNT, set debounce 50mS $2D, [$20] ' 0x2D: CTRL_REG4 register, enable transient interrupt $2E, [$20] ' 0x2E: CTRL_REG5 interrupt configuration register, Route the Transient Interrupt to INT 1 hardware pin Re: 8452 vehicle motion Great. Thank you very much for the excellent support. Marco Re: 8452 vehicle motion Hi, I recommend you to use the Transient Detection embedded function because it compares whether any of the enabled axes has exceeded a set change in acceleration disregarding the static acceleration. The data that is compared to the threshold to be exceeded is high-pass filtered data. The application note AN4071 can help you to understand what is this embedded transient detection function and how to properly set the registers to use this function. And you can also use the application note AN4601 as a more specific guideline for your application since for this document, the MMA8452 was used to detect whether a car is moving by combining the accelerometer's auto-wake/sleep and transient detection functions. Have a great day, Jose ----------------------------------------------------------------------------------------------------------------------- Note: If this post answers your question, please click the Correct Answer button. Thank you! -----------------------------------------------------------------------------------------------------------------------

I want to measure /- 62.5 pascal from MPXV7002DP sensor. How can i accomplish that with good repeatability ? I want to measure +/- 62.5 pascal (+/- 0.25 inch H2O) from MPXV7002DP sensor. How can i accomplish that with good repeatability ? From what i see in the datasheet, it gives 2500mV at 0 pascal, and +/- 1mV per pascal on the positive or negative side. I am assuming to follow these steps : 1) Using a Differential amplifier, subtract 2437.5 mV from the output signal of MPVX7002DP, this will result in 0mV at -62.5 pascal differential pressure - AND also result in 125 mV at +62.5 pascal Diff. Pressure. and then, 2) Add a gain stage of x24, so the resultant max 125mV will become 3000mV, which is the upper range of my ADC. However, my problems are : A) Is this the right approach ? B) how do i generate a precise reference of 2437.5 mV for the differential amplifier ? C) The graph of output voltage from the sensor shows different slopes at different temperatures. How do i accomodate for this in my design ? Thanks for your help. Re: I want to measure /- 62.5 pascal from MPXV7002DP sensor. How can i accomplish that with good re Hi - I would also be interested in the NPS30 devices. I have used about 15000 MVPV7002DP units over the last 7 years, but I am finding it difficult to source now that ventilators are in such high demand. My product, which is used in the industrial safety field, depends on the ability to measure down from -100Pa. I would dearly love to fit a gauge sensor capable of negative pressures, but I have not found one yet. Also I2C would be preferable to analog and associated signal conditioning. Re: I want to measure /- 62.5 pascal from MPXV7002DP sensor. How can i accomplish that with good repeatability ? Hello. Thank you Frank for the insight and new product offering. We were in the process of finalizing our product design, which includes the MPXV7002DP for very low D.P. measurement, along with other sensing, control and logging systems. As we would have it, we do have some time on hand for doing actual tests on prototypes, before locking everything down. Would it be possible for you guys to share with us the Datasheet(s) and any application notes for the indicated NPS30 series of sensors, possibly with footprint and 3D model data, so we could in the mean time, design test prototype PCBAs ? By the time that's done, your new NPS30 would be available (hopefully), so perhaps we could sample a few and test on the new prototypes to finalize the electrical and mechanical design of our product, and plan productions accordingly ? You might understand, that the firmware will be finalized on the actual prototypes as well, so having the soft data (datasheets, app notes and PCB library footprint / 3d step files, etc.) early on would help us finalize our product design faster and reduce our go-to-market time. Thanks. Re: I want to measure /- 62.5 pascal from MPXV7002DP sensor. How can i accomplish that with good repeatability ? Hello, reviewing the datasheet for the MPXV7002DP, the typical sensitivity is ± 2.5% full scale span equating to ±100 Pa which is larger than ± 62.5 Pa required. We will however, have a digital differential pressure sensor (NPS30 family) available for sampling later this year that will meet your requirements. MCU based software examples will also be available for several different Freedom MCU boards at Sensor Toolbox: Sensor Development Ecosystem|NXP . Please contact our regional sales team for additional information.

Long term water level monitoring using MPxx5004 Hi there, I am looking to use the MPxx5004 to measure water level over a long period of time, 5 – 10 days. I have built a test rig to check the use of the pressure sensor. A silicon tube is submerged to the bottom of the reservoir with the other end of the tube connected to the sensor. The sensor is always above the water level ensuring a column of air between the reservoir and the sensor. What I’m seeing though is a drift in the range of 0.25 – 0.35v in a 24 hour period. The drift is not only negative but appears to be cyclical as if the sensor is being effected by temperature (or some other environmental attribute). Any help would be appreciated. Re: Long term water level monitoring using MPxx5004 Hi Jose, thanks so much for you response. Pleased that I have the correct method of measurement in place. The drift that I am seeing could be in as little as 12 hours, yesterday I observed a movement of 918mV to 1,090mv in just 8 hours where the tank had no change in water level. Thanks in advance. Ben. Re: Long term water level monitoring using MPxx5004 Hi, You are performing the correct method to measure water level using pressure sensor by using the silicon tube and the column of air avoiding the sensor to be in direct contact with the water. Sources of offset errors and drift are due to device to device offset variation (trim errors), mechanical stresses (mounting stresses), shifts due to temperature and aging. Performing auto-zero will greatly reduce these error. Auto-zero is a compensation technique based on sampling the offset of the sensor at reference pressure in order to correct the sensor output drift or variation, this technique will correct the error on zero pressure and across the complete pressure range. Details about the autozero technique can be found in the Application note AN1636: https://www.nxp.com/docs/en/application-note/AN1636.pdf Regards, Jose NXP Semiconductors

如果 MMA8451Q 上的 SA0 未连接，会发生什么情况？ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 我不小心在我最新的板上留下了 MMA8451Q 的 SA0。我可以期待什么样的行为？我认为，它要么默认使用一个地址（0x1C 或 0x1D），要么在启动时确定地址（即随机选择一个地址，但只要有电就一直使用），要么在地址之间不断跳转？第一种和第二种情况可以很容易地通过软件来处理，但第三种情况会很糟糕。谢谢！编辑：AN4077 规定"第 7 引脚（SA0：地址引脚）、......都应使用上拉/下拉电阻器，以确保保持引脚的状态。" ，因此我认为不连接该引脚是个错误的做法。信息编辑者：osed 加速度传感器 Re: What happens if SA0 is left unconnected on MMA8451Q? <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 嗨，奥斯卡、是的，SA0 引脚没有内部上拉或下拉电阻，因此无法知道如果保持浮空，引脚处的值是多少。要求 SA0 引脚连接至 VDDIO（7 位地址 = 0x1D）或 GND（7 位地址 = 0x1C）。此致，托马斯 PS：如果我的回答有助于解决您的问题，请标记为"正确" 。谢谢。

Is the MPX4250DP a direct replacement for MPX4250GP Can the MPX4250DP be used in place of the MPX4250GP if one side of the differential is vented to atmosphere? Just got notice today that the MPX4250GP is obsolete. Pressure Sensors Re: Is the MPX4250DP a direct replacement for MPX4250GP Hello Greg, Yes you can use any of our differential pressure sensors (DP) as a gauge pressure sensor (GP) as long as you apply pressure into port number one and leave port number two open to the atmosphere. Have fun! Josh

Question, Sensor Tool Box on Windows10 Dear team, My customer is using FRDMKL25-A8471 for evaluating NXP/Accelerometer. And they are facing the issue that SensorToolBox software does not run on Windows10 PC. Could you please give your advice to solve this issue? They downloaded FreedomSensorToolboxCEInstaller(v2.5.0) from NXP/WEB site. And they downloaded PEDrivers_install(v12.4) from PEmicro/WEB site. And they installed those with default settings. As a result they saw the software can run on Windows7(Pro 32bit edition) but it does not run on Windows10(PRO 64bit) environment. They think the connection between PC and the board cannot be established. Could you please give your advice to solve this issue? Thanks, Miyamoto Accelerometers Re: Question, Sensor Tool Box on Windows10 Dear Miyamoto-san, Sounds like your customer is experiencing the issue described in Chapter 7.1 of the STBCEUG. Please recommend him to download and program the board with the latest OpenSDA driver from PEmicro website. If everything goes well, the FRDM-KL25Z should be detected/shown as a removable disk in Windows Explorer and enumerated as a serial port in the Device Manager/Ports group. I hope it helps. Best regards, Tomas

FXLSA0322 output data rate I want to know what is the data rate of FXLSA0322?The customer needs a minimum data rate of 500HZ, but I don't know if FXLSA0322 is compatible.And what does LSB 4P 800HZ stand for? Re: FXLSA0322 output data rate Hi Ren, Please distinguish between the FXLS (Thornapple) and FXLSA (uThornapple) series. Both datasheet were sent to you internally by my colleague Jozef. Since your current question is related to the FXLS60322, please follow up on this through your Case #00274802. Thank you for your understanding. Best regards, Tomas Re: FXLSA0322 output data rate Hi Tomas In my datasheet, this table information of yours is not shown.At the same time, I need your help to confirm the maximum data rate of FXLS60322, the range and whether it can be adjustable.My version of the manual is shown in the picture. Looking forward to your reply! Best Regards! Ren Re: FXLSA0322 output data rate Hi Ren, The output data rate depends on the bandwidth selected. For a 500Hz data rate, you would need a bandwidth of less than 250Hz. The customer would have to determine what bandwidth they need for their application. There are several filter selections in the device. Reference the table in Section 6.2.23 and pasted below. Each filter has a Bessel equivalent response and the details are included in the datasheet. The DSP sample time is listed for each filter. 16x data interpolation is used on the output data to increase the output data rate. I have added a table below for some example filter selections. I am not sure what the context is for “LSB 4P 800HZ”. This looks like a partial description for some settings for the part. One low pass filter option is an 800Hz, 4-Pole LPF as explained above. Best regards, Tomas

pressure sensor Hi i would like to use pressure sensor MPX2100A in my project 1-i read 110kpa what mean (atmosphic pressure +100 kpa ) 2-is it possible to use arduino with this pressure sensor Re: pressure sensor Hello Noury, 1. The MPX2100A is an absolute pressure sensor, which means that the device output refers to the absolute value of the force per-unit-area exerted on a surface. Therefore the absolute pressure is the difference between the pressure at a given point and the absolute zero of pressure or a perfect vacuum. In this case you are not reading the atmospheric pressure, you are reading the pressure applied to P1. 2. Indeed, you can use the MPX2100A with the Arduino. Please be aware that the MPX2100A is a compensated pressure sensor which means that the given output it’s already internally temperature compensated, so externally you only need to add the amplification circuit before sending the sensor’s signal to the MCU’s ADC. You may refer to the following amplification circuit: I hope this information will be useful for you. If I misunderstood your question, feel free to let me know. I will be glad to help. Have a great day. David Diaz. Note: If this post answers your question, please click the Correct Answer button. Thank you!

设置 MPX2010DP 差压传感器 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 你好我在设置 MPX2010DP 压力传感器时遇到了问题。我把它连接到一个皮托管上，它可以测量管道内部的压力。传感器输出连接到 NI 9215 +/-10V 模拟输入模块。该模块记录数据，并使用我编写的 Labview VI 处理这些数据。传感器有 4 个引脚。 1：接地，2：V+输出，3：V 电源（我使用的是 12 伏电源），4：V-输出。 V+out 和 V-out 连接到 NI 9215 模拟输入模块。引脚 1 的地线连接到 9215 模块的 COM，而 COM 则连接到电源地线。 Vsupply 连接到 12V 电源。问题）我似乎无法正确设置。无论是线路问题，还是电源电压问题，还是其他什么问题。使用电压表，我得到的电压似乎与任何压力波动都不对应；它起着分压器的作用。解答）传感器的输出范围是 0-25mV。这是否需要信号调节或放大？使用增益为 400 的运算放大器，我就能获得 10V 的输出范围吗？问题）我做错了什么？我以为我只需要提供电压然后用模拟输入读取输出，但事实证明这很困难。我是否过度分析了自己的问题？谢谢您！戴维压力传感器 Re: Setting up the MPX2010DP differential pressure transducer <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 你好，戴维、 MPX2010DP 的所有 4 个引脚都需要如下连接：引脚 1：接地引脚 2：正输出电压引脚 3：电源电压（建议 10V）引脚 4：负输出电压该传感器的输出是差分补偿的，这意味着传感器可以提供毫伏范围内的差分输出（输出已经过内部温度补偿），在将传感器的输出信号发送到 MCU 的 ADC 之前，需要从外部添加放大电路。在应用笔记 AN1318 中，您可以找到一些有关如何将压力传感器的差分输出连接到 mcu 的示例： http://www.nxp.com/assets/documents/data/en/application-notes/AN1318.pdf 现在，我建议你改用集成的压力传感器，这种压力传感器已经过内部补偿、校准和放大，因此除了很少的电容（如 MPX5010 数据表的图 3 所示）之外，你不需要很多外部元器件，而且输出已经在 0 到 5V 的范围内（如 MPX5010 数据表的图 4 所示），因此它比 MPX2010DP 压力更容易使用传感器。集成低压范围传感器的一个示例是 MPX5010 系列，你可以在以下链接中找到设备数据表：https://www.nxp.com/docs/en/data-sheet/MPX5010.pdf 此致，何塞

How can we buy this whole system in video http://www.nxp.com/video/:AIRBAGDEMO_VID ? How can we buy this whole system in video http://www.nxp.com/video/:AIRBAGDEMO_VID? There is no purchasing web link.We like to buy a set as demostrating the clash impact,please mail to :kelic@meinkindbaby.com,thanks Accelerometers Re: How can we buy this whole system in video http://www.nxp.com/video/:AIRBAGDEMO_VID ? Hi,Jose, Thanks for your reply,could you please kindly help me to quote if this program is available ? Since the RDAIRBAGPSI5 can not have the wireless transfering function ,or how can we add the wireless function to it,cause we have to put all these opponents on clash trolley and can not connected to computer when clash test,thanks. Best regards Kelic Wu Re: How can we buy this whole system in video http://www.nxp.com/video/:AIRBAGDEMO_VID ? Hi, Unfortunately the AIRBAGDEMO system is not on sale, however, there are some other Airbag Evaluation Platforms that you can get directly from NXP or through an authorized distributors, I recommend you to take a look at the RDAIRBAGPSI5 evaluation platforms. Have a great day, Jose ----------------------------------------------------------------------------------------------------------------------- Note: If this post answers your question, please click the Correct Answer button. Thank you! -----------------------------------------------------------------------------------------------------------------------

A suitable pressure sensor for e-cigarette application for sensing air flow Hello Team, Could you please suggest a suiatlabe pressure sensor for sensing the airflow in the E-CIG application? the minimum requirements as follow: Pressure range – the main issue is to indicate the human inhale, which could be used in the e-cigarette Temp range 0-40 deg. C Supply voltage 3.3-5VDC Looking forward to your recommendations, Thanks a lot. Best regards, Shai Re: A suitable pressure sensor for e-cigarette application for sensing air flow Got it, Thanks. KR, Shai Re: A suitable pressure sensor for e-cigarette application for sensing air flow Hi Shai, Unfortunately, it would not be possible to measure pressure below +20kPa using the MPL3115A2 For this case, I would return back to my initial recommendation, the MPXV7002 which can measure negative and positive pressure in the range from -2kPa to +2kPa. This is an analog output sensor, so you would need to use an external ADC to convert the analog signal to a digital signal. MPXV7002 datasheet: https://www.nxp.com/docs/en/data-sheet/MPXV7002.pdf Regards, Jose Re: A suitable pressure sensor for e-cigarette application for sensing air flow @reyes, I've noticed that there is no digital pressure sensor that can measure negative pressure. Since as far as I know the physics of breathing, the inhales pressure is around –4 mm Hg to -10 mm Hg (negative) which is around 0.5 – 1.5 kPa (negative) but the MPL3115 starts from +20 kPa (up to 110 kPa). Could you please suggest the right implementation technic to detect human inhale with MPL3115? Thanks in advance Kind regards, Shai Re: A suitable pressure sensor for e-cigarette application for sensing air flow Hi, Correct, MPL3115A2 is a digital ouput solution. And other digital output options are: FXPQ3115: https://www.nxp.com/docs/en/data-sheet/FXPQ3115BV.pdf FXPS7115: https://www.nxp.com/docs/en/data-sheet/FXPS7115D4.pdf Regards, Jose Re: A suitable pressure sensor for e-cigarette application for sensing air flow Dear @reyes, Thank you a lot for your inputs, Can you please suggest a suitable pressure sensor with a digital output? Could I offer him the MPL3115A2 as an option for a pressure sensor with a digital output? Thanks in advance. Kind regards, Shai Re: A suitable pressure sensor for e-cigarette application for sensing air flow Hi, I don’t have experience with the application of e-cigarettes, but I’m assuming for this application… The pressure range is small around 2 to 4 kPa (please correct me if I’m wrong), Since it is for human inhale you need to measure negative pressure, And I would personally use a device that can handle both negative and positive pressure mainly for protection of the device (in case someone exhale in the e-cigarrate). Based on these points and your requirements, I would like to recommend you the MPXV7002DP: https://www.nxp.com/docs/en/data-sheet/MPXV7002.pdf Regards, Jose

TEF81xx と TEF82xx の共通価格は? S32R294-RADBの購入を検討しています。ただし、合計価格については、TEF81xx や TEF82xx (レーダーアンテナとトランシーバー) などの不足しているコンポーネントの通常価格を知る必要があります。正確な価格は必要ありません。アンテナ数など平均して 1 個あたりの概算です。 10 USD / 100 USD / 500 USD / 1000 USD / 2000 USD 以上といったところでしょうか? ヒントやアドバイスがあれば嬉しいです。

センサ、特にMMA8491QR1のFiT / MTBFレートを提供していますか？ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> センサ、特に MMA8491QR1 の FiT / MTBF レートを提供していますか?お客様と共有するにはどこにありますか? 加速度センサ Re: Do we offer FiT / MTBF rates for Sensors, especially MMA8491QR1 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> こんにちは、マイケル。実際、NXP センサの FIT/MTBF レポートを提供することができます。この場合、MMA8491QR1 に関して要求された資料を取得するために、 NXP TechSupport 経由で新しい CASE を作成できます。素晴らしい一日をお過ごしください。デビッド

Underpressure rating for MPL115A Hi, only overpressure is specified in the maximum ratings in all the datasheets I've seen for pressure sensors. I'm using the MPL115A sensor, and there it's specified 1000kPa overpressure as a maximum. What is the maximum underpressure for this component? Will it handle -0.5 Bar? Pressure Sensors Re: Underpressure rating for MPL115A Roger, you're welcome, please contact us back if you need further support. Have fun! Josh Re: Underpressure rating for MPL115A Thanks for your reply Joshvelle! I got the info I needed. I was unsure how you made these sensors. The reason why I asked the question was because I'm following a procedure to fill a tank with a specific gas (first to make vacuum, when filling it with gas). In the procedure it is said that the electronics inside could be exposed to pressure of -0,5Bar. I would assume they have used a gauge manometer when they made the procedure, to be able to determine the pressure value. - Roger Re: Underpressure rating for MPL115A Hello Roger, Absolute Pressure Sensors like the MPL3115A are designed to measure an external pressure relative to a zero–pressure reference (vacuum) sealed inside the reference chamber of the die during manufacture. You mentioned that you would expose the sensor to -50kPa (-0.5Bar), how did you measure that level? Did u use a gauge manometer? If that’s the gauge pressure level inside a chamber (tank or something similar), then you would be exposing the MPL115A to the atmospheric level minus 50kPa, which is around positive 50kPa (absolute pressure). Please let me know if I misunderstood your question. Hope it helps! Josh

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