SARA-R4 series - System Integration Manual
UBX-16029218 - R06
System description
Page 33 of 102
1.13.9.5
Host application
The PSM low power deep sleep mode implementation allows the SARA-R4 series module to help extend the
battery life of the application.
The Host Application should be aware the SARA-R4 series module is PSM capable.
The host application needs to sense the
V_INT
supply output of the module to get the notification when
the module has entered into PSM low power deep sleep mode.
If the host application receives an event that needs to be reported by the SARA-R4 series module
interrupting the PSM low power deep sleep mode, it can be done so by setting the module into Active
mode using the appropriate power-on event (see 1.6.1).
From the host application point of view, the SARA-R4 module will look as it is in Power-Off mode.
1.13.9.6
Normal operation
The Host Application can force the SARA-R4 series module to transition from PSM low power deep sleep mode
to Active mode by using the Power Up procedure specified in section 1.6.1.
Host application should be aware that transitioning from low power deep sleep mode to active mode will
make the SARA-R4 series module to consume same amount of power as in Active-Mode shortening the
battery life of the host application.
