topic Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions: in Sensors

I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Tue, 03 Feb 2026 21:44:32 GMT

I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

1. How precise is the pressure measurement, does it measure to the second or third decimal?

2. Could you provide LCD screen that provides a visual display of measured temperature and pressure?

3. Could you provide a computer/microcontroller that allows me to manipulate the data via addition, subtraction and multiplication of measured pressure and temperature to get a desired output?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

david_diaz — Fri, 17 Jun 2016 15:31:06 GMT

Hello Jewuan,

1. The pressure range of the FXTH8715027T1 device is calibrated (100 - 1500 kPa).

The pressure offset accuracy is +/- 17kPa as follow:

2. You may refer to the following TPMS Display Demo:

http://www.nxp.com/video/tire-pressure-monitoring-sensor-tpms-ipad-display-demo:TPMS-DISPLAY-DEMO

3. The Kinetis KW01 may act as the Receiver for the FXTH870xD TPMS Sensor.

Please refer to the following application note:

http://www.nxp.com/files/32bit/doc/app_note/AN5136.pdf

This application note will first detail KW01 and FXTH870xD register settings, followed by guidance to modify the demonstration software for both parts and to set up a TPMS system using the KW01 connected to a PC as a receiver with a stand-alone FXTH870xD transmitting.

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.

PS: If my answer helps to solve your question, please mark it as "Correct". Thank you.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Sat, 25 Jun 2016 22:25:30 GMT

David,

Thanks, your response was very helpful.

Do you have programming code for TPMS display demo you provided?

Is the FXTH8715027T1 sensor compatible with specific tires or will it work with any vehicle tire?

Thanks

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

david_diaz — Mon, 27 Jun 2016 22:49:17 GMT

Hello Jewuan,

I am glad to know the information was useful for you.

1. In regard with the source code of the TPMS Display Demo, we do not have rights to the source code because it is an application developed by a 3rd party.

You may send me a private message in case you are interested on this demo.

2. TPMS employs pressure sensors installed in valve stems or elsewhere on the wheel rims or in the tire, to provide independent, frequent air pressure measurements for each tire. These measurements are transmitted to the vehicle instrument cluster to inform the driver.

The package should be mounted with the pressure port pointing away from the axis of tire rotation so that centrifugal force will propel any contaminants out of the pressure port. In cases where the application must orient the pressure port pointing inward, care must be taken to assure contaminants do not reach inside the pressure port.

Please be aware that the pressure range of the FXTH8715027T1 is 100-1500 kPa. It support s medium and heavy duty trucks, buses and construction vehicles for TPMS markets.

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.

PS: If my answer helps to solve your question, please mark it as "Correct". Thank you.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Wed, 29 Jun 2016 22:42:28 GMT

David,

Thanks again, I'm interested in using the sensor on a truck that doesn't have TPMS installed, will that be a problem? I'm more interested in using the Kinetis KW01 to relay the information from the sensor to a PC.

I really like the demo, but I would want to add another output variable, how difficult would that be?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Fri, 01 Jul 2016 14:41:27 GMT

AN5136 application note describes FXTH87xx and KW01 behavior.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Mon, 11 Jul 2016 18:51:39 GMT

Thanks, can you provide a link for information about the AN5136?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

david_diaz — Mon, 11 Jul 2016 19:36:21 GMT

Hello Jewuan,

As I mentioned before, the Kinetis KW01 may act as the Receiver for the FXTH870xD TPMS Sensor.

Your can find more information about the AN5136 at:

http://www.nxp.com/files/32bit/doc/app_note/AN5136.pdf

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.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Fri, 15 Jul 2016 22:42:39 GMT

David,

Do you all offer a TPMS similar to FXTH8715027T1 but that measures to the hundredth psi? I need a very accurate TPMS.

Thanks

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Sat, 23 Jul 2016 22:08:27 GMT

David,

Will the sensor output the pressure as millivolts? I want to determine the load on a tire from vehicle weight in addition to its inflated psi and I think the only way to detect the load on the tire, specifically small loads like 200 pounds or less, I would need the pressure output in mV which I could use to determine a weight/mV conversion factor given that I know the inflated psi mV output. I hope you understand what I'm asking for, please let me know if I need to be more detailed, the scenario below may help.

Scenario.

- TPMS is installed and tire pressure is measured P1

-The tire is then mounted on a vehicle, taking a portion of the vehicle's load/weight

-The additional load causes the tire pressure to increase to P2

-The sensor recognizes the change to P2 with an increase in mV but the change is so small that the receiver does not show it and instead continues to show P1.

This is the case where having the output however small sent to the receiver in the form of millivolts would help in determining weight/psi.

Thanks

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Wed, 03 Aug 2016 22:50:15 GMT

Tzyy-Hong

Will the FXTH8715027T1 sensor output the pressure as millivolts? I want to determine to increase in psi from vehicle weight or any additional load and I think the only way to detect small loads like 200 pounds or less, I would need the pressure output in mV which I could use to determine a weight/mV conversion factor given that I know the inflated psi mV output. I hope you understand what I'm asking for, please let me know if I need to be more detailed, the scenario below may help.

Scenario.

- TPMS is installed and tire pressure is measured P1

-The tire is then mounted on a vehicle, taking a portion of the vehicle's load/weight

-The additional load causes the tire pressure to increase to P2

-The sensor recognizes the change to P2 but the change is so small that the receiver does not show it and instead continues to show P1.

This is the case where having the output however small sent to the receiver in the form of millivolts would help in determining weight/psi.

Thanks

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Mon, 08 Aug 2016 01:11:00 GMT

Hi,

I am not familiar with FXTH87xx product and I already forward your question to the expert of FXTH87xx product team. I hope that they can give you reply soon. Sorry for inconvenience caused.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Mon, 08 Aug 2016 15:50:15 GMT

The firmware in FXTH87 family generates a digital value between 1 and 510 counts representing 2.75 kPa per count, between the range 100 to 1500 kPa. The function described is the same, however instead of attempting to determine a change in millivolts, you would determine a change in kPa. No need to converter to millivolts, as the sensor provides already the pressure P1 or P2 in kPa.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Wed, 17 Aug 2016 03:25:18 GMT

I tried AN5136 sample code running at MRB-019032 orignally. I also load it into FRDM-019032. It works.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Sat, 20 Aug 2016 17:01:24 GMT

So I received the sensors and receiver, I'm not sure why but I assumed the sensors would come installed inside of a tire valve stem already but its just the sensor. What tire valve stem should I order to put the sensors in?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Sun, 21 Aug 2016 11:41:13 GMT

Are you saying that you received FDRM-KW019032 and FXTH87xx EVB ? If, yes. You can find AN5136 S/W package. It is a qick demo setup. You still need to customize it for your product development.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Sun, 21 Aug 2016 14:32:49 GMT

My question is how do you install the FXTH87XX sensors in a tire? I thought that it would come installed in a tire valve stem but I only received the 7x7 mm sensor. Do I just place it in the tire? If not, what device do I need to purchase to mount it in a tire?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Mon, 22 Aug 2016 01:28:31 GMT

Regarding your question how to install FXTH87xx sensor in a tire, it is designed by TPMS system manufacturing company. AN5136 just provide TX/XR S/W package, you can use it for customization if you design your own TPMS. Most of manufacturing companies are located in Taiwan, for example, Orange, CUB,....

Orange Electronic Co., Ltd. - TPMS(Tire Pressure Monitoring System)

You can visit their website for reference if you want to purchase their product.

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jewuanwilliams — Tue, 23 Aug 2016 16:28:29 GMT

So you all don't sell anything that would allow me to mount the sensor in a tire? I've been working with you all for three months now with hopes of getting the senors, configuring them and installing them in a tire.

To carry out the procedures listed in the AN5136, I would also have to purchase FXTH870xD TPMS Sensor board, correct?

Re: I'm interested in your TPMS FXTH8715027T1 and I have a few questions:

jasonchiang — Wed, 24 Aug 2016 05:08:20 GMT

Yes, you need to have FXTH870xD TPMS sensor board to carry out the procedures listed in the AN5136. Thanks for understanding.