Settcxomode; Table 6-2: Settcxomode Command; Table 6-3: Tcxo Supply Voltage Programming Values - Semtech LR1121 User Manual

6.3.2 SetTcxoMode

Configures the chip for a connected TCXO.
The TCXO must be configured using SetTcxoMode(...) before calling GetTemp().

Table 6-2: SetTcxoMode Command

Byte 0
Data from Host 0x01
Data to Host Stat1
•
RegTcxoTune tunes the output voltage on the TCXO supply pin VTCXO, according to
Programming Values.

Table 6-3: TCXO Supply Voltage Programming Values

RegTcxoTune
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
•
Delay represents the maximum duration for the 32MHz oscillator to start and stabilize (in 30.52us steps). If the 32MHz
oscillator from the TCXO is not detected internally at the end the delay period, the device internal firmware triggers a
HF_XOSC_START_ERR error.
0: Disables TCXO mode (default value).

1: Sets TCXO mode. A complete Reset of the chip is required to get back to normal XOSC operation.

Command only operates in Standby RC mode, otherwise it returns CMD_FAIL on the next GetStatus() command.
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
1 2
0x17 RegTcxoTune
IrqStatus
Stat2
(31:24)
TCXO Supply Voltage (typ)
1.6 V
1.7 V
1.8 V
2.2 V
2.4 V
2.7 V
3.0 V
3.3 V
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3 4
Delay Delay
(23:16) (15:8)
IrqStatus IrqStatus
(23:16) (15:8)
Table 6-3: TCXO Supply Voltage
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5
Delay
(7:0)
IrqStatus
(7:0)
47 of 130
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