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| 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)： | 6/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
103
12.8
Application Information
The LFR module is very versatile with many sampling options available. The key for lowest power consumption and reliable
communications is to have a coordinated transmit and receive interval strategy. The transmitter must broadcast a message often
enough for the periodically sampling LFR to receive it in a certain time frame. The transmitter and receiver are asynchronous and
controlling where in a datagram the LFR samples is not predictable. This section provides some example communication
strategies along with some explanation on how software should be written to handle the events.
12.8.1
Example 1: Manchester Data Mode
An example of the sampling of a Manchester data packet is given in Figure 12-21.
In Manchester mode, a series of Manchester encoded 0s, called the preamble, starts the transmission to allow the receiver to
acquire the signal and data rate. After the preamble is complete, a synchronization pulse train is transmitted to further allow the
receiver to hone the data rate boundary limits and signal the start of the data frame. The data frame consists of an identification
code and a variable number of data bytes.
It is critical that the LFR wakes up in the preamble information to acquire the signal. In this example, with sample period = 32 ms,
the transmitter must broadcast a preamble for a minimum of 32 ms plus 8 data bit times for a message to be consistently received.
If the transmitted preamble is less than 32 ms plus 8 data bit times, it is possible that the LFR would wake-up in either the sync
character or in the data frame. In either of these cases, the LFR will not recognize the message and will not wake-up the MCU.
The following is the equation for calculating the average current in Manchester data mode:
ilfr_avg = (tOn/tPeriod) x ilfr_active-typ
which resolves to:
ilfr_avg = (2 ms / 32 ms) x 93 A = 5.8 μA
LFCS0
= 0x 55
7
LFDO
S (R only)
Does not need to be initialized.
d (0)
6
LFIE
C
Not applicable to direct MCU mode.
0
5
LFOFF
S (R only)
Not applicable to direct MCU mode.
d (0)
4
LFRST
C
Not applicable to direct MCU mode.
d (0)
3
LFEN
C
Must be set to 1 for LFR to be enabled
1
2
LFWU8
C
Not applicable to direct MCU mode.
d (0)
1
LFLVL
C
Will start with low sensitivity. If nothing is seen for a very long
period then could switch to high sensitivity.
1
0
LFAGC
C
Not applicable to direct MCU mode.
d (0)
LFCS1
= 0x 40
7
LFDF
S (R only)
Not applicable to direct MCU mode.
d (0)
6
LFDFAK
C
Upon reset, LFDF, LDBF and LFAF should be clear but it is
recommended to reset them anyway.
1
5
LFCF
S (R only)
Not applicable to direct MCU mode.
d (0)
4
LFCFAK
C
Not applicable to direct MCU mode.
d (0)
3
LFBF
S (R only)
Not applicable to direct MCU mode.
d (0)
2
LFAF
S (R only)
Not applicable to direct MCU mode.
d (0)
1
MDD0
S (R only)
Not applicable to direct MCU mode.
d (0)
0
LFIG
C
Detector output which must be monitored.
0
Table 12-13 Direct MCU Mode Control and Status Register Initialization (Continued)
Register
Bit
Position
Bit Name
Control
/Status
Use and Initialization Comments
Initial
Binary
Value
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| PPYY12C1.50 50M | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 1.5MM 50M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 1.5MM, 50M |
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