User's Manual
MeiG hardware design guide
5
Figure 4.2:DC-DC power supply circuit
Note:
If the user does not use battery power, please note that a 10K resistor is connected to the 134 pin
(BAT_THERM) of the module and pulled down to GND to prevent the software from judging the
abnormal battery temperature after the module is turned on, resulting in shutdown. The connection
diagram is as follows:
Figure 4.3:Connection diagram when not powered by battery
4.1.1 Power Pin
The VBAT pin (49, 50) is used for power supply input. In the user's design, please pay special
attention to the design of the power supply part to ensure that the VBAT drop should not be lower
than 3.4V even when the module consumes 2A. If the voltage drops below 3.4V, the module may
shut down. The PCB layout from the VBAT pin to the power supply should be wide enough to
reduce the voltage drop in the transmit burst mode.