Power Down; Sleep; Table 2-1: Setstandby Command; Table 2-2: Setsleep Command - Semtech LR1110 User Manual

The command SetStandby( ) sets the device in standby mode with the chosen 32MHz oscillator.

Table 2-1: SetStandby Command

Byte
Data from Host
Data to Host
• StdbyConfig = 0x00 selects the internal RC oscillator (Standby RC mode).
• StdbyConfig = 0x01 selects the external Xtal/TCXO oscillator (Standby Xosc mode).

2.1.2 Power Down

This is the lowest power consumption mode of the device. In this mode, all clocks are stopped, and therefore no RTC is
available. Moreover, there is no data retention which means that a device reconfiguration is necessary when leaving the
power down mode. The BUSY signal is set to high in this mode, indicating to the host that the device is not ready to accept
a command.
The device is put in power down mode with the SetSleep( ) command (refer to sleep mode description).
The device can exit this mode based on the detection of an event on a DIOs, or NSS pin. Exiting this mode, the device will
perform a firmware restart. When the BUSY pin is set to low, it indicates that the startup phase has been performed
successfully, and that the device is ready to accept a command.

2.1.3 Sleep

The Sleep mode allows configuring the LR1110 into a low power consumption mode between radio or geolocation
operations, while retaining the configuration register values and storing the firmware data in RAM.
An optional 32 kHz source is running either on the internal RC oscillator, or on the internal 32.768 kHz oscillator driving an
external crystal. The 32.768kHz crystal oscillator allows a faster transition to standby mode, at the expense of higher power
consumption. In both cases, the RTC uses the 32kHz clock source to allow an automatic wake-up from the Sleep mode.
The command SetSleep( ) allows putting the device in Powerdown and Sleep mode, and configuring the timeout for
automatic wake-up.

Table 2-2: SetSleep Command

Byte 0
Data from Host 0x01
Data to Host Stat1
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
0
0x01
Stat1
1 2
0x1B SleepConfig
IrqStatus
Stat2
(31:24)
www.semtech.com
1
0x1C
Stat2
3 4
SleepTime SleepTime
(31:24) (23:16)
IrqStatus IrqStatus
(23:16) (15:8)
2
StdbyConfig
IrqStatus(31:24)
5 6
SleepTime SleepTime
(15:8) (7:0)
IrqStatus
0x00
(7:0)
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