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參數(shù)資料
| 型號(hào)： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 12/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
109
13.3
RF Output Buffer Data Frame
When using the RF data buffer mode each frame of data is sent as 1 to 128 bits per frame with a possible 2 trailing bits for an
end-of-message, EOM, as shown in Figure 13-3. The actual data being transmitted in a given data frame and any combinations
of data frames into a single datagram is dependent on the user software.
Figure 13-3 Data Frame Formats
The data buffer is unloaded to the RF output starting with the least significant bit (RFD0) in the least significant byte (BUFF0) up
through the most significant bit (RFD127) in the most significant byte (BUFFF).
13.3.1
Data Buffer Length
The number of bits sent in a given transmission is selected by the FRM0:6 control bits encoded as a direct binary number plus
one. This gives a range of 1 through 128 bits. Data written to data buffer bits above the highest bit number will be ignored.
Transmission always begins with the data written in the BUFF0 location.
13.3.2
End of Message (EOM)
If the EOM control bit is set, then at the end of the data frame there will be carrier for a period of 2 bit times for the ASK modulation
modes or fRF + Δf for the FSK modulation modes. Following the EOM period there will be no carrier for either the ASK or FSK
modes. If the EOM control bit is clear, no EOM period will be added to the transmission.
13.4
Data Encoding
The CODE control bit selects either Manchester or Bi-Phase data encoding of each data bit being transferred from the RF data
buffer to the RF output stage. If the CODE control bit is clear the encoding will be Manchester; and if the CODE control bit is set
the encoding will be Bi-Phase. Further, the polarity of the selected encoding method can be inverted using the POL control bit.
13.4.1
Manchester Encoding
In the Manchester encoded format, data is transmitted as a transition in voltage occurring in the middle of the bit time. The polarity
of this transition is selected by the POL bit. When the POL bit is cleared, then a logical LOW is defined as an increase in signal in
the middle of a bit time and a logical HIGH is defined as a decrease in signal in the middle of a bit time as shown in Figure 13-4.
When the POL bit is set, then a logical LOW is defined as an decrease in signal in the middle of a bit time and a logical HIGH is
defined as a increase in signal in the middle of a bit time as shown in Figure 13-5. Since there is always a transition in the middle
of the bit time there must also be a transition at the start of a bit time if consecutive “1” or “0” data are present.
2
EO
M
128
8
Maximum
130-Bit Format
80-Bit Format
53-Bit Format
8-Bit Format
Data in each byte defined by user software
Optional EOM
BUFF0 BUFF1 BUFF2 BUFF3 BUFF4 BUFF5 BUFFA BUFFB BUFFC BUFFD BUFFE BUFFF
80
BUFF0 BUFF1 BUFF2 BUFF3 BUFF4 BUFF5 BUFF6 BUFF7 BUFF8 BUFF9
53
BUFF0 BUFF1 BUFF2 BUFF3 BUFF4 BUFF5
BUFF6
2
EO
M
Bits 0:2
with all byte lengths
BUFF0
Minimum
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