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参数资料
| 型号： | APGAC031 |
| 厂商： | Microchip Technology |
| 文件页数： | 5/12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
FIGURE 4:
LF CIRCUITRY
LF In
R5
COUT
LF Out
10 k Ω
CIN-
GP3
D2
L1
Inductor
C11
220 pF
D3
Schottky
R3
51 k Ω
C9
1000 pF
Schottky
rfPIC12F675_SSOP
Details of the LF transmission format and the specific
commands can be found in the Section “LF Com-
mander” .
RF Transmission Format
The encoding method used for this demonstration
system is the 1/3-2/3 PWM format with T E (basic pulse
element) time of 400 μ s and a bit period of 3xT E or
1.2 ms.
Preamble : The preamble is a series of 31 logic ‘ 1 ’ bits
followed by a single logic ‘ 0 ’ bit. The preamble allows
the receiver to recognize the RF transmission as a valid
S/TX message. The preamble also allows the receiver
to synchronize to the RF message, thereby compen-
sating for any oscillator inaccuracies within the
transmitter. The system designer may vary the number
of preamble bits based on system requirements. Lon-
ger preamble bit lengths may be appropriate where
receiver quiescent current is an issue. Shorter
FIGURE 5:
Logic ‘ 1 ’
T E T E T E
Preamble
Transmitter ID
Pressure
Temperature
Battery
Status
CRC
RF TRANSMISSION
ENCODING METHOD
Logic ‘ 0 ’
T E T E T E
Bits
32
32
8
8
8
8
16
preamble bit lengths may be appropriate where S/TX
battery usage is a concern. In either case, it is purely a
trade-off between receiver quiescent current and
battery power consumed by the S/TX device.
Transmitter ID : The 32 transmitter ID bits are used to
uniquely identify each S/TX. A frame of 32 bits ensures
that there is a very low probability that any two S/TXs
will have the same ID.
Pressure : The pressure in kPa is obtained by multiply-
ing the unsigned binary value of this byte by 2.5.
Temperature : The temperature in degrees C is
obtained by subtracting 40 from the unsigned value of
byte 8.
Battery : Bit 7 of this byte indicates the battery
condition. A logic ‘ 1 ’ is considered normal while a logic
‘ 0 ’ indicates a low battery voltage.
Status : This status byte contains the following informa-
tion:
Bits 0 and 1 : Indicate operating state of sensor IC
00 = Initial or Storage mode
01 = Normal mode
10 = Pressure Alert mode
11 = Temperature Alert mode
CRC (2 bytes) : Implement according to CCITT
standards.
? 2009 Microchip Technology Inc.
DS00238C-page 5
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