Calibimage; Calibrate; Table 2-6: Calibimage Command; Table 2-7: Ism Band - Semtech LR1110 User Manual

2.4.1 CalibImage

The CalibImage( ) command launches an image calibration for the given range of frequencies Freq1 and Freq2.

Table 2-6: CalibImage Command

Byte
Data from Host
Data to Host
By default, the image calibration is made in the band 902 - 928 MHz. Nevertheless, it is possible to request the device to
perform a new image calibration at other frequencies. The frequencies are given in 4MHz step (Ex: 900MHz -> 0xE1).
Once performed, the calibration is valid for all frequencies between the two extremes used as parameters. Typically, the
user can select the parameters freq1 and freq2 to cover any specific ISM band. If twice the same frequency is given as
argument, only one calibration at the given frequency is performed.

Table 2-7: ISM Band

Frequency Band [MHz]
430-440
470-510
779-787
863-870
902-928
In case of POR or when the device is recovering from power down or sleep mode without retention, the image calibration
is performed as part of the initial calibration process and for optimal image rejection in the band 902 - 928 MHz. However
at this stage the internal state machine has no information whether an XTAL or a TCXO is fitted.
The command will operate in any mode of the device. At the end of the calibration procedure, the device returns to Standby
RC.
Note: Contact your Semtech representative for the other optimal calibration settings outside of the given frequency bands.

2.4.2 Calibrate

The Calibrate( ) command calibrates the requested blocks defined by the CalibParams parameter.

Table 2-8: Calibrate Command

Byte
Data from Host
Data to Host
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0
0x01 0x11
Stat1 Stat2
Freq1
0x6B
0x75
0xC1
0xD7
0xE1 (default)
0
0x01
Stat1
www.semtech.com
1 2
Freq1
IrqStatus
(31:24)
1
0x0F
Stat2
3
Freq2
IrqStatus
(23:16)
Freq2
0x6E
0x81
0xC5
0xDB
OxE9 (default)
2
CalibParams
IrqStatus(31:24)
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