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| 型号： | APGRD003 |
| 厂商： | Microchip Technology |
| 文件页数： | 22/42页 |
| 文件大小： | 0K |
| 描述： | KIT TPMS REFERENCE DESIGN |
| 标准包装： | 1 |
| 类型： | 汽车 - 轮胎压力监视器 |
| 频率： | 433.92MHz |
| 适用于相关产品： | PIC18F4680，PIC18F2680，MCP2030 |
| 已供物品： | 基站、低频起始器板和轮胎压力传感器节点 |
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Tire Pressure Monitoring System User’s Guide
3.4.3.4
RF MESSAGE OVERVIEW
The transmitted message follows the HCS365 PWM format via a 433 MHz carrier
signal, which consists of:
? A preamble (31 TE, 50% duty cycle) for baud rate calculation on the receive side
? A header (4 or 10 Te, user selectable)
? Data bytes:
- Tire Location ID (1 Byte, user defined)
- Sensor ID (2 Bytes, user defined)
- Pressure Data (2 Bytes)
- Temperature Data (2 Bytes)
- Battery Low Flag (1 Bit)
- Dummy Bits (7 Bits)
Refer to the HCS365 data sheet (DS41109) for more information.
FIGURE 3-4:
RF MESSAGE FORMAT
LOGIC "0"
LOGIC "1"
T E
T E
T E
Transmission Direction LSb First
1
16
T BP
31xTe 50% Preamble
4-10
xT E
Header
Data Bytes
Note:
3.4.3.5
For the next three sections, refer to A.13 Circuit Block Figure in
Appendix A. “Schematic and Layouts” for circuit block diagram.
PRESSURE MEASUREMENT
? Drive pin RC0 and RA1 high to power up the sensor and the Op-Amp (MCP6273)
that is used for signal amplification
? Enable the Op-Amp with pin RA5
? Pin RC2 is set up as the analog input to the internal ADC for pressure measure-
ment
3.4.3.6
TEMPERATURE MEASUREMENT
? Drive pin RC0 pin high to power up the sensor and the op-amp used for signal
amplification. This also pulls the sensor bridge high through R5. The R5 and the
sensor bridge form a resistive divider which is monitored by the internal ADC
through pin RA1. Since the sensor internal bridge resistance is temperature
dependent, the voltage on the resistor divider will change accordingly.
? Pin RC0 is configured as the analog input of the internal ADC. Vref for the ADC is
selected as internal which is equal to the battery voltage minus the diode drop.
? The recommended serial resistor (R5) value should be 10 kOhm or greater to
minimize the influence of the parasitic of the microcontroller pins (about
200 Ohm).
DS51624B-page 18
? 2006 Microchip Technology Inc.
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