Power Distribution; Power Modes; Setregmode; Table 5-1: Setregmode Command - Semtech LR1121 User Manual

5. Power Distribution

5.1 Power Modes

Two power modes are available:
•
DC-DC converter for low power applications,
•
LDO for low-cost or small size applications.

5.1.1 SetRegMode

Command SetRegMode(...) defines which regulator should be used.

Table 5-1: SetRegMode Command

Byte
Data from Host
Data to Host
•
RegMode defines if the DC-DC converter has to be switched ON:
0: Do not switch on the DC-DC converter in any mode (Default).

1: Automatically switch on the DC-DC converter, depending on the mode as per

Other values are RFU.

This command only works with the device in Standby RC mode, otherwise it returns CMD_FAIL on the next GetStatus
command.
The following table illustrates the power regulation options for different modes and user settings.

Table 5-2: Power Regulation Options

Circuit Mode
Regulator Type = 0
Regulator Type = 1
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
0
0x01
Stat1
Sleep STDBY_RC
- LDO
- LDO
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1
0x10
Stat2
STDBY_XOSC FS
LDO LDO
DC-DC + LDO DC-DC + LDO
2
RegMode
IrqStatus (31:24)
Table 5-2.
RX TX
LDO LDO
DC-DC + LDO DC-DC + LDO
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