Table 2-3: Sleepconfig Parameter; Table 2-4: Sleep Mode Summary - Semtech LR1110 User Manual

Table 2-3: SleepConfig Parameter

SleepConfig bit
Definition
• The SleepConfig bits define in which sleep mode the device is put, and if it wakes up after a given time on the RTC
event:
Retention bit (bit 0) defines if the device configuration and the firmware data are retained.

Retention=1: 8 kB of memory used for device state and firmware data retention.

Retention=0: no data retention.

Wakeup bit (bit 1) determines if the device wakes up after a given time on the RTC event.

Wakeup=1: automatic wake-up enabled. The device will automatically go in Standby mode with RC oscillator, at

the end of the SleepTime timer. The 32 kHz clock source is configured using the command ConfigLFclock ( ) for
modem applications.
Wakeup=0: automatic wake-up disabled.

Other bits are RFU and should be set to 0.

•
SleepTime: sleep time in number of 32.768 kHz clock cycles, prior to automatic wake-up. Therefore, the sleep time can
vary from 0 ms to 36.4 hours in steps of 30.52us.
BUSY is set to 1 in sleep mode.
The device can exit this mode based on the detection a falling edge on the 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.
The following table summarizes the different sleep modes according to the Retention and Wakeup bits configuration, with
their current consumption and Standby transitions times (indicative values, for comparison only).

Table 2-4: Sleep Mode Summary

Retention Wakeup
0 0
0 1
1 0
1 1
The mode Retention=1 and Wakeup=0 is a valid usage mode, but does not correspond to any datasheet description.
LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
bit 7 bit 6 bit 5
RFU RFU RFU
Datasheet
Powerdown
Sleep
-
Sleep w/ 8kB retention
www.semtech.com
bit 4 bit 3
RFU RFU
Indicative Consumption (uA)
RC /XTAL
IDDPDN
IDDSL1 / IDDSL2
-
IDDSL3A / IDDSL4A
bit 2 bit 1 bit 0
RFU Wakeup Retention
Indicative Transition to Stby
(ms)
30
30
-
<1
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