SM1211E915TOPIC Semtech, SM1211E915TOPIC Datasheet - Page 31
![KIT PICTAIL EXT FOR SX1211](/photos/14/10/141075/sm1211e915topic_sml.jpg)
SM1211E915TOPIC
Manufacturer Part Number
SM1211E915TOPIC
Description
KIT PICTAIL EXT FOR SX1211
Manufacturer
Semtech
Type
Transceiver, UHFr
Specifications of SM1211E915TOPIC
Frequency
915MHz
For Use With/related Products
SX1211
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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In addition to the Peak OOK threshold mode, the user can alternatively select two other types of threshold
detectors:
In the first example, the higher cut-off frequency enables a sequence of up to 8 consecutive “0” or “1” to be
supported, whilst the lower cut-off frequency presented in the second example allows for the correct reception of up
to 32 consecutive “0” or “1”.
The Bit Synchronizer (BitSync) is a block that provides a clean and synchronized digital output, free of glitches.
The BitSync can be disabled through the bits RXParam_Bitsync_off, and by holding pin IRQ1 low. However, for
optimum receiver performance, its use when running Continuous mode is strongly advised. With this option a
DCLK signal is present on pin IRQ_1.
The BitSync is automatically activated in Buffered and Packet modes. The bit synchronizer bit-rate is controlled by
MCParam_BR. For a given bit rate, this parameter is determined by:
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
Fixed threshold: The value is selected through the MCParam_OOK_floor_thresh register (refer to section
3.4.10.1 for further information concerning optimization of the floor threshold).
Average threshold: Data supplied by the RSSI block is averaged with the following cutoff frequency:
3.4.11. Bit Synchronizer
nd
, 2008
3.4.10.3. Alternative OOK Demodulator Threshold Modes
DCLK in continuous
Raw demodulator
To pin DATA and
RXParam
RXParam
BitSync Output
(FSK or OOK)
output
mode
BR
_
_
Figure 24: BitSync Description
OOK
OOK
IRQ_1
DCLK
DATA
64
_
_
*
cutoff
cutoff
Page 31 of 92
1
MCParam
F
XTAL
11
00
⇒
⇒
Fcutoff
Fcutoff
_
BR
32
8
BR
BR
*
*
www.semtech.com
SX1211
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