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| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 32/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 32 of 89
Preamble
SFD
Length
Data received over RF
SFD Pin
FIFO Pin
FIFOP Pin, if threshold
higher than frame length
FIFOP Pin, if threshold
lower than frame length
SFDdeecLenghbyereceved
byereceved
Preamble
SFD
Length
Data received over RF
SFD Pin
FIFO Pin
FIFOP Pin
Adcompeed
MAC Protocol Data Unit (MPDU) with correct address
MAC Protocol Data Unit (MPDU) with wrong address
Figure 12. Pin activity examples during receive
Transmit mode
During transmit, the
FIFO
and
FIFOP
pins
are still only related to the RXFIFO. The
SFD
pin is however active during
transmission of a data frame, as shown in
Figure 13.
The
SFD
pin goes high when the SFD field
has been completely transmitted. It goes
low again when the complete MPDU (as
defined by the length field) has been
transmitted or if an underflow is detected.
See the RF Data Buffering section on
page 37 for more information on TXFIFO
underflow.
As can be seen from comparing Figure 12
and Figure 13, the
SFD
pin behaves very
similarly during reception and transmission
of a data frame. If the
SFD
pins of the
transmitter and the receiver are compared
during the transmission of a data frame, a
small delay of approximately 2
μ
s can be
seen because of bandwidth limitations in
both the transmitter and the receiver.
Preamble
SFD
Length
Data transmitted
over RF
SFD Pin
SFDtansmted
LaTXundefow
MAC Protocol Data Unit (MPDU)
STXON
command
12 symbol periods
Automatically generated
preamble and SFD
Data fetched
from TXFIFO
CRC generated
by
EM2420
Figure 13. Pin activity example during transmit
General control and status pins
In receive mode, the
FIFOP
pin can be
used to interrupt the microcontroller when
a threshold has been exceeded or a
complete frame has been received. This
pin should then be connected to a
microcontroller interrupt pin.
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| EM242303 | 功能描述:柵欄接線端子 EURO MC421-38103 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類型:Screw 觸點(diǎn)電鍍:Tin |
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