飛思卡爾輪胎壓力監控系統(TPMS) 在線座談問題解答(9)
[ 問題 71 ] 33594前面要不要加聲表面濾波器?不加會有什么影響？
[ 答案 71 ] 一般情況33594前面可不用加聲表面濾波器, 因為左前級加上濾波器可以濾去noise但同時也會增加 noise figure of whole system.
[ 問題 72 ] 請問33594前面要用SAW嗎，不用會有什么影響？
[ 答案 72 ] 一般是不用加SAW, 原因請看以前我的答題
[ 問題 73 ] 請問飛思卡爾輪胎壓力監控系統(TPMS)的核心原理.能簡單介紹一下嗎?
[ 答案 73 ] It is in the presentation. You can re-play it.
[ 問題 74 ] 收器是否顯示每個輪胎的氣壓，還是只顯示告警的低氣壓？輪胎模塊可以檢查出低氣壓閾值，其使用的能量要少于獲得完整
的8位值所需的能量。
氣壓和溫度的測量頻率是多少？
是否需要對氣壓和溫度兩個參數都進行測量，還是其中一個參數的測量頻率要高于另外一個？
是否需要溫度補償功能 (即，改變低壓告警閾值作為溫度的一個函數)？若需要，是在輪胎端還是在接收器端部署？輪胎模塊
執行計算的次數越多，電池壽命越短。
[ 答案 74 ] Normally, Pressure is measured more frequent than temperature. Some countries will take one measurement every 3s and after 10 readings, it is then transmited. So this is once every 30s unless large change in measurement is seen. The transmit will take the temp and pressure is measured on separate times. Normally regulations would mandate pressure requirement and not temp (Im 100% sure on temp). So people tend to take more measurements with pressure than temp. Our temperature device has a positive coef
[ 問題 75 ] 輪胎模塊的具體安裝位置？以及壓力和溫度傳感器具體采集壓力和溫度數據的過程？謝謝！！！
[ 答案 75 ] The sensing module is mounted inside the rim or valve stem of the wheel. Essential an internal 8bit register is used to perform the A/D function in the sensor module. A digital output is provided, you need to shift them out. For pressure, the int
