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SIM800_Hardware Design_V1.09 46 2016-06-30
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:
Figure 42: Reference circuit of PWM drive buzzer
Table 26: PWM output characteristics
Note: PWM pin must keep low when module in the boot process.
Table 27: PWM multiplex function
4.16. Network Status Indication
Table 28: Pin definition of the NETLIGHT
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
Network Status Indication
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