XE1202AI027TRLF Semtech, XE1202AI027TRLF Datasheet - Page 18

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

5.2.2
Table 13 below provide an example of LO frequency setting in FSParam_Freq:
© Semtech 2006
FSParam configuration register
Name
Byte
00011
Bit 7
FSParam_Band
FSParam_Freq
FSParam_Dev
FSParam_BR
00000000
00000000
00000000
11111111
11111111
Address
Bit 0
Bits
7-6
5-3
2-0
7-0
00000000
00000001
00000010
11111111
11111110
Bit 7
7-0
Byte Address
Table 12: FSParam configuration register
00100
Table 13: LO Frequency setting
Byte Address
00010
00010
00010
00011
00100
Bit 0
19
F0, where F0 depends on the selected
frequency band (see FSParam_Band
F0 = 434.0 MHz for the 433-435 MHz band
F0 = 869.0 MHz for the 868-870 MHz band
F0 = 915.0 MHz for the 902-928 MHz band
F0 + 500 Hz
F0 + 2 * 500 Hz
F0 – 500 Hz
F0 – 2 * 500 Hz
XE1202A TrueRF™
Description
Frequency band:
0 0 -> not valid
0 1 -> 433 – 435 MHz
1 0 -> 868 – 870 MHz
1 1 -> 902 – 928 MHz
Frequency deviation:
0 0 0 -> 5 kHz
0 0 1 -> 10 kHz
0 1 0 -> 20 kHz
0 1 1 -> 40 kHz
1 0 0 -> 100 kHz
Bit rate:
0 0 0 -> 4.8 kbits/s
0 0 1 -> 9.6 kbits/s
0 1 0 -> 19.2 kbits/s
0 1 1 -> 38.4 kbits/s
1 0 0 -> 76.8 kbits/s
others -> not valid
LO frequency in 2’s-complement
representation:
00…0 -> f
0X…X -> f
1X…X -> f
MSB = bit 7 of byte at pos. 00011
LSB = bit 0 of byte at pos. 00100
See example below
Note: FXTAL = 39.0 MHz
middle of the range
middle of the range
LO frequency
LO
= middle of the range
LO
LO
= higher than the
= lower than the
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