User Manual
HLK-B40
Serial port of module
Mobile APP
Figure 9 Data transmission through serial port and app
6. Low power sleep function
This module is developed based on BLE 5.1 supporting low power consumption and can be flexibly
configured in many aspects to further reduce power consumption.
Configurable items
Description
Adjust transmit power
The lower the transmission power, the lower the power consumption but
the shorter the transmission distance
Adjust the broadcast interval
and connection interval
The larger the interval, the lower the power consumption but the greater
the delay
Turn on auto sleep
6μA After the automatic sleep function is turned on, the module can be
controlled by the input level of the external sleep control input pin.
High level: the main chip will sleep automatically.
Low level: wake up to work at full speed.
The minimum operating current can be as low as 6 μ a during dormancy
Figure 5
A list of configuration items to reduce power consumption
All the above can be modified through the AT command, the user can be flexible according to the actual
application scenario and requirements to achieve a balance between power consumption and performance.
When automatic sleep is turned on, the hibernate output outputs different levels to indicate whether the module is
