Parts List/Tune Up Info

CPU

Pulling the RESET, will reboot the CPU
Interface definitions are shown in the following table:
Table 1 boot and reset key interface definitions
Note: The pull-up voltage of PWRKEY and EXTON1N was consistent with that of VBAT,
and the pull-up voltage of RESET was 1.8V.
3.2 Power-on sequence
VBAT power, VAON (RTC clock source), PWRKEY also synchronous power. After the
PWRKEY pin is lowered, the module starts up, and all internal power sources such as
VDD1V8 start up one after another. When the Status pin becomes high, it means the
module starts up and can be used normally.
Table 38 power-on sequencing
Symbols
Pin Name
Min
Typ
Max
Unit
Ton
Start-up low level pulse width
0.5
16
--
s
TSTATUS
BOOT time (based on the
Status Pin)
12
13
--
s
TUART
BOOT time (according to UART
judgement)
11
12
--
s
VIH
PWRKEY pin input high level
voltage
0.7*VBAT
--
VBAT
V
VIL
PWRKEY pin input low level
voltage
0
--
0.3*VBAT
V
3.3 Power-off sequence
Modules have the following shutdown methods:
 Shut down using the PWRKEY Pin
 Shutdown using the "AT CPOF" command
Note: 1. For a detailed description of "AT + CPOF" , refer to documentation [1] .
2. Overvoltage (high or low) may also cause the module to shut down automatically.
3. Exceeding the limit temperature of the module may also cause the module to shut down
automatically.
Pin No.
Pin Name
I / O type
Functional description
3
EXTON1N
AI
Power-on trigger, level trigger (active low)
4
RESET
DI
reset input. Active low
86
PWRKEY
AI
Input pad generally connected to a keypad
power-on Button. Active low