SIM800L datasheet(48/73 Pages) SIMCOM

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Table 29: ADC specification

Parameter

Min

Typ

Max

Unit

Voltage range

2.8

ADC Resolution

bits

Sampling rate

1.0833

MHz

ADC precision

4.14. PWM

Table 30: Pin definition of the PWM

Pin name

Pin number

Description

PWM

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

Working current

Note: PWM pin must be kept at low power level when module is in the power on procedure.

SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

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