NB-IoT Module Series
BC65 Hardware Design
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3.5. Power Saving
Upon system requirements, there are several ways to drive the module into low current consumption
status.
3.5.1. Light Sleep Mode
In this mode, the UART interface is still active and the module can be woken up through the main UART
interface.
3.5.2. Deep Sleep Mode
Based on system performance, the module consumes an ultra-low current (typically 4
μA current
consumption) in Deep Sleep mode. Deep Sleep mode is designed to reduce the power consumption of
the module and improve battery life. In this mode, the UART interface is inactive. The following figure
shows the power consumption of the module (modem) in different modes.
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Idle
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UE inactive time
Idle
Figure 3: Module (Modem) Power Consumption in Different Modes
When the modem remains in PSM and the AP is in idle mode, the module will enter Deep Sleep mode.
Deep Sleep
When the AP is in idle mode and the modem is in PSM, the module will enter Deep
Sleep mode in which the CPU is powered off and only the 32 kHz RTC clock is working.
In Deep Sleep mode, the current consumption will be reduced to the minimum (typically
4 μA).
