How does the NTM88/PTM88 judge speed?

[joophliu]

Dear NXP Supports:

     How does the NTM88 judge speed?

[joophliu · Accepted solution]

Thank you very much! It need speed sensor or analyze CAN message(speed) from can CAN bus!

[TomasVaverka]

Dear Jooph,

I am not sure I understand the question, could you or your customer provide more information? What speed are they referring to? 

An internal single-axis accelerometer can be used to determine whether a vehicle is moving or stopped, it is not used to calculate the speed based on acceleration data.

Also note that the NTM88H0x5 is a direct TPMS using the pressure transducer to measure the pressure inside the tire. There are also indirect TPMS which typically use the wheel speed sensor.

Best regards,

Tomas