Smart Machine Smart Decision
Table 29: ADC specification
Parameter
Min
Typ
Max
Unit
Voltage range
0
-
2.8
V
ADC Resolution
-
10
-
bits
Sampling rate
-
-
1.0833
MHz
ADC precision
10
30
mV
4.14. PWM
Table 30: Pin definition of the PWM
Pin name
Pin number
Description
PWM
26
PWM signal
SIM800H&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 0 to 2kHz. 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 45: Reference circuit of PWM driver buzzer
Table 31: Buzzer characteristics
Parameter
Min
Typ
Max
Unit
Working voltage
2.5
2.8
2.9
V
Working current
16
mA
