MeiG Smart product technical information
SLM500
Hardware Design Guide
Page 31
4.1.1. Power Pin
The VBAT pin (1
、
2
、
145
、
146) is used for power input. In the user's design, pay special
attention to the design of the power supply section to ensure that the VBAT does not fall below
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.
Figure4.4
：
VBAT lowest voltage drop
4.2. Power on and off
Do not turn on the module when the module's temperature and voltage limits are exceeded.
In extreme cases, such operations can cause permanent damage to the module.
4.2.1. Module Boot
The user can power on the module by pulling the KYPD_PWR_N pin (114) low. The pull-
down time is at least 5 seconds. This pin has been pulled up to 1.8V in the module. The
recommended circuit is as follows; or the CBL_PWR_N pin (
186
) is pulled low. CBL_PWR_N
can be powered on by 10K pull-down resistor to GND. It does not need to release this signal
after booting.
Figure 4.5
：
Using an external signal to drive the module to boot
