LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
35 of 130
Semtech
www.semtech.com
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.
• 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 Table 5-2
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.
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:
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
To Next Page
Loading...