Semtech LR1121 - Temperature Sensor; Gettemp; Table 4-7: Gettemp Command; Table 4-8: Gettemp Response

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
40 of 130
Semtech
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4.3 Temperature Sensor
The LR1121 has a built-in temperature sensor which gives an indication of the internal device temperature.
4.3.1 GetTemp
The temperature measurement can be triggered using command GetTemp(...).
The temperature value is a function of an internal reference voltage (typ. 1.35V), and a typical temperature characteristic
(typ -1.7mV/°C), and can be approximated using the following formula:
NOTE: GetTemp() uses XOSC mode to get the temperature, so if a TCXO is connected to the LR1121, it must be configured
using
SetTcxoMode before calling GetTemp().
Table 4-7: GetTemp Command
Byte 0 1
Data from Host 0x01 0x1A
Data to Host Stat1 Stat2
Table 4-8: GetTemp Response
Byte 0 1 2
Data from Host 0x00 0x00 0x00
Data to Host Stat1 Temp(15:8) Temp(7:0)
Temperature degC  25~
1000
1.7mV/°C–
----------------------------
Temp(10:0)/2047*1.35 - 0.7295 +