Network Status Indication - SimCom SIM800 Hardware Design

output period and for the duty cycle. The AT command "AT + SPWM" is used to set the output period and duty
cycle of the PWM. For details, please refer to document [1].
A typical circuit of the PWM drives buzzer is shown in the following figure:
Table 26: PWM output characteristics
Parameter Min
Working voltage 2.5
Working current
Note: PWM pin must keep low when module in the boot process.
Table 27: PWM multiplex function
Pin name Pin number
PWM0 35
PWM1 36

4.16. Network Status Indication

Table 28: Pin definition of the NETLIGHT
Pin name Pin number
NETLIGHT 52
The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in
following table:
Table 29: Status of the NETLIGHT pin
SIM800_Hardware Design_V1.10
Module
4.7K
PWM
Figure 42: Reference circuit of PWM drive buzzer
Typ
2.8
4
Mode 0(default)
PWM0
GPIO
Description
Network Status Indication
46
Smart Machine Smart Decision
VBAT
47K
Max
2.9
16
Mode 1
GPIO
PWM1
Unit
V
mA
2018-08-13