N27 Hardware User Guide
Chapter 4 Application Interfaces
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Figure 4-3 Reference design of startup controlled by MCU
R1
4.7k
Ω
N27 module
PWRKEY_N
R2
47k
Ω
USER_ON
Q
Startup Process
After powering on the VBAT pin, input a negative pulse for longer than 100 ms at PWRKEY_N to start
the module. Do not perform other operations on the module until it is initialized completely. If the module
is powered on but the power-on process has not been completed, the state of each pin is uncertain.
Figure 4-4 shows the startup timing.
Figure 4-4 Startup timing
VBAT
UART
TBD
>100ms
PWRKEY_N
Shutdown Process
The N27 module allows users to shut it down through hardware or software.
PWRKEY_N is used to power the module off. When the module is working, inputting negative pulse
for longer than 2 seconds to PWRKEY_N can trigger the shutdown process of the module.
