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

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
41 of 130
Semtech
Proprietary & Confidential
www.semtech.com
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.
• 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 Table 5-2.
 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 5-1: SetRegMode Command
Byte 0 1 2
Data from Host 0x01 0x10 RegMode
Data to Host Stat1 Stat2 IrqStatus (31:24)
Table 5-2: Power Regulation Options
Circuit Mode Sleep STDBY_RC STDBY_XOSC FS RX TX
Regulator Type = 0 - LDO LDO LDO LDO LDO
Regulator Type = 1 - LDO DC-DC + LDO DC-DC + LDO DC-DC + LDO DC-DC + LDO