LPM2100 bg NB Module Hardware Usage Guide
Shanghai Yuge Information Technology Co., Ltd.
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Figure 3-9 UART serial port design
The module serial port TTL is the IO output level value. If the serial port needs to be
connected to the 3.3V level MCU, an external level conversion chip needs to be added
externally to achieve level matching. The chip connection method can refer to the following
circuit
：
Figure 3-10 UART level conversion circuit
3.6 Power saving technology
LPM2100 bg supports three power saving modes
：
PSM (Power Saving Mode)
DRX (Discontinuous Reception)
eDRX (Extended DRX, extended discontinuous reception mode)
3.6.1 PSM
The main purpose of the PSM function is to reduce module power consumption and
extend battery life. The module consumes a maximum of 5uA in PSM mode.
