XE1202AI027TRLF Semtech, XE1202AI027TRLF Datasheet - Page 20

• Manufacturer Part Number: XE1202AI027TRLF
• Description: Narrow Band 433/868/915MHz RF Transceiver
• Manufacturer: Semtech

5.2.5
The pattern register may be used to automatically detect the reception of a user-defined pattern and asserts the
PATTERN signal for one bit duration. In this register, a reference pattern length of 8, 16, 24, or 32 bits (see
ADParam_Psize parameter) may be defined. The first byte of the pattern is always stored at byte address A[4:0] (=
01000). If defined, the second and subsequent byte(s) are stored at address A[4:0] = 01001, and so on.
The MSB of the reference pattern is always bit 7 of the address 01000 and the LSB is bit 0 of address 01000,
01001, 01010, or 01011 if the pattern length is 8, 16, 24, or 32 bits, respectively.
Comparing the demodulated data, the first bit received of the last word (or second, third or fourth from last word,
depending upon the value stored in the ADParam_Psize register) is compared with bit 7 (the MSB) of byte address
01000. The last bit received is compared with bit 0 (the LSB) in the Pattern register.
© Semtech 2006
Pattern register
Name
ADParam_WBBcond
ADParam_Regcond
ADParam_Regfreq
ADParam_RegBW
ADParam_Xsel
RESERVED
Pattern
Name
Bits
5
4
3
2
1
0
Bits
7-0
Table 15: ADParam configuration register
Table 16: Pattern register addresses
Byte Address
00111
00111
00111
00111
00111
00111
01000
01001
01010
01011
Byte Address
21
XE1202A TrueRF™
Description
Baseband
regulation:
0 -> Enabled
1 -> Disabled
Periodicity
bandwidth regulation:
0 -> only at start-up of the receiver
1 -> every 60 seconds whilst
receiver enabled
Regulation process of the baseband
filter bandwidth according to the
selected bandwidth:
0 -> regulation restarted each time
1
Boosting process of the baseband
filter according to the selected
bandwidth:
0 -> boosting restarted each time
1
Selection
capacitance mode:
0 -> CLop + C0 = 15 pF
1 -> CLop + C0 = 11 pF (low-current
mode)
RESERVED
Description
1
2
3
4
st
nd
rd
th
byte of the reference pattern
byte
byte
byte
the bandwidth is changed
bandwidth is changed
the bandwidth is changed
bandwidth is changed
->
->
no
no
of
of
filter
the
regulation
boosting
baseband
XOSC
bandwidth
when
when
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