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SIM800L(MT6261)_Hardware Design_V1.01 44 2016-07-07
SIM800L provides an auxiliary ADC, which can be used to measure the voltage. Customer can use AT command
“AT+CADC” to read the voltage value.
NOTE
：
If use the ADC function, digital interface characteristics should refer to table 38 strictly. For details of this AT command,
please refer to document [1].
Table 26: ADC specification
Parameter Min Typ Max Unit
Voltage range 0 - 2.8 V
ADC Resolution - 10 - bits
ADC precision 10 30 mV
4.14. PWM
Table 27: Pin definition of the PWM
SIM800L provides a PWM which can be used to drive a vibrator, and a backlight LED for display or keyboard.
PWM output frequency varies from 200Hz to 100KHz. Two 7-bit unsigned binary parameters are used for the
output period and for the duty cycle. 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 recommended circuit of the PWM driver buzzer is shown in the following figure.
Figure 42: Reference circuit of PWM driver buzzer
Table 28: Buzzer characteristics
ADC 50 Analog voltage input
PWM 26 PWM signal
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