Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 System description Page 37 of 119
• If the USB interface is enabled, the module does not enter the deep sleep power saving mode.
1.13.9.5 AT commands
The module uses the +CPSMS AT command with its defined parameters to request PSM timers to the network.
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☞ See the SARA-R4/N4 series AT Commands Manual [2] for details of the +CPSMS operation and features.
1.13.9.6 Host application
The PSM low power deep sleep mode implementation allows the SARA-R4/N4 series module to help extend the battery
life of the application.
The Host Application should be aware that the SARA-R4/N4 series module is PSM-capable.
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☞ 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.
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☞ If the host application receives an event that needs to be reported by the SARA-R4/N4 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).
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☞ From the host application point of view, the module will look as it is in Power-Off mode.
1.13.9.7 Normal operation
The Host Application can force the SARA-R4/N4 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.
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☞ Be aware that when the host application transitions from low power deep sleep mode to active mode, it will cause
the SARA-R4/N4 series module to consume the same amount of power as in active mode, thereby shortening the
battery life of the host application.