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参数资料
| 型号： | APGAC031 |
| 厂商： | Microchip Technology |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | KIT ACC TIRE PRESSURE MON SYSTEM |
| 标准包装： | 1 |
| 类型： | 汽车 - 轮胎压力监视器 |
| 频率： | 315MHz |
| 适用于相关产品： | APGRD003 |
| 已供物品： | 轮胎传感器节点 |
AN238
After application of power, the rfPIC microcontroller
executes an initialization procedure and goes into a
Sleep mode until a state change is detected on either
the SP-13 data line or the LF input. Either of these
inputs generates a wake-up, causing the rfPIC micro-
controller to transition into the Run mode. If the
wake-up was generated by the SP-13, the rfPIC micro-
controller reads the incoming data, assembles the data
into an appropriate message, and transmits the mes-
sage via the RF transmitter. Once the RF message is
sent, the rfPIC microcontroller reenters the Sleep
mode. If the wake-up was generated by the LF input,
the rfPIC microcontroller interprets the LF message,
executes the command and then reenters the Sleep
mode.
RF Circuitry
The PLL style transmitter within the rfPIC microcon-
troller requires minimum external components to com-
plete the RF transmitter. The fundamental frequency of
the transmitter is determined by Y1. To derive the
appropriate crystal frequency, simply divide the desired
transmit frequency by 32. For example, if the desired
transmit frequency is 315 MHz, the crystal frequency is
9.84375 MHz.
Loop antenna L3 is matched to the single-ended RF
driver via C3 and C8, which also form the resonant tank.
Refer to application note AN831, “ Matching Small Loop
Antennas to rfPIC ? Devices ” (DS00831) and applica-
tion note AN868, “ Designing Loop Antennas for the
rfPIC12F675 ” (DS00868) for additional technical detail
on selecting the appropriate component values for your
RF application.
Capacitor C4 is selected to provide decoupling for the
3V supply. Be sure the components selected for your
application have a self-resonant frequency well above
the desired transmit frequency. The filter formed by L2
and R6 further help decouple the high frequency
energy from the rest of the circuitry. The R6 also de-Q’s
the antenna.
The output power of the transmitter circuit can be
adjusted via R8, maximum power is obtained when it is
left an open circuit. The transmit power can be changed
per the “ Power Select Resistor Select ” table located in
the “ rfPIC12F675 ” Data Sheet (DS70091). This is also
useful when trying to certify a product to FCC
regulations.
FIGURE 2:
RF CIRCUITRY
R8
N. I.
PS
C4
270 pF
R6
220 Ω
L2
120 nH
C3
5 pF
XTAL
Y1
Loop Antenna
L3
ANT
9.84375 MH Z
C8
C5
22 pF
100 pF
? 2009 Microchip Technology Inc.
DS00238C-page 3
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