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5. Power Distribution
5.1 Power Modes
Two power modes are available: DC-DC converter for low power applications, and LDO for low-cost or small size
applications.
The command SetRegMode( ) defines which regulator should be used.
Table 5-1: SetRegMode Command
Byte
Data from Host
Data to Host
•
The RegMode parameter defines if the DC-DC converter has to be switched ON :
RegMode = 0: do not switch on the DC-DC converter in any mode (Default)
RegMode = 1: automatically switch on the DC-DC converter, depending on the mode as per
This command will only work with the device in Standby RC mode, otherwise it will return 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
5.2 Over Current Protection
An Over Current Protection (OCP) block is built-in the LR1110. It prevents surge currents when the device is used at its
highest power levels, thus protecting the battery that may power the application. The current clamping values are
trimmable by register access. By default, the OCP values are 60mA for the low power PA, and 150mA for the high power PA.
5.3 VBAT Measurement
The battery supply voltage can be monitored using the GetVbat( ) command. This command returns the Vbat voltage as a
function of a reference voltage:
LR1110
User Manual
Rev.1.0
UM.LR1110.W.APP
March 2020
0
0x01
Stat1
Sleep
STDBY_RC
-
LDO
-
LDO
www.semtech.com
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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