Pwm; Table 26: Adc Specification - SimCom SIM800L Hardware Design

Pin name Pin number
ADC 50
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
Voltage range
ADC Resolution
Sampling rate
ADC precision

4.14. PWM

Table 27: Pin definition of the PWM
Pin name
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.
Table 28: Buzzer characteristics
SIM800L(MT6261)_Hardware Design_V1.01
Description
Analog voltage input
Min Typ
0 -
- 10
- -
10
Pin number Description
26 PWM signal
Module
4.7K
PWM
Figure 42: Reference circuit of PWM driver buzzer
Smart Machine Smart Decision
Max
2.8
-
1.0833
30
VBAT
47K
44
Unit
V
bits
MHz
mV
2016-07-07