| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize a tire gas pressure monitoring device capable of securing accuracy of data transmission rate in radio communication without being accompanied by increase of vibrators and rising cost. <P>SOLUTION: A tire pressure measuring module 1 comprises a microcomputer 3, a starting circuit 21, a pressure sensor 22, a temperature sensor 23, a frequency divider circuit 4, a transmission circuit 5, and a battery 10. The microcomputer 3 comprises a clock generation circuit 31, A/D conversion circuits 32, 33, and a control part 34. The transmission circuit 5 comprises an oscillation circuit 53, and the frequency divider circuit 4 divides a carrier wave CW from the oscillation circuit 53 and outputs it to the control part 34 of the microcomputer 3 so as to be used for data transmission timing to a data signal line DL. By producing a clock signal for data transmission of the microcomputer 3 with the inexpensive frequency divider circuit 4 utilizing the oscillation circuit 53 of the transmission circuit 5, the clock signal for data transmission with high accuracy is produced without using an expensive vibrator in the microcomputer 3. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
