Adc; Pwm - SimCom SIM800 Hardware Design

PWRKEY
(INPUT)
GPIO17
GPIO19

4.14. ADC

Table 23: Pin definition of the ADC
Pin name
ADC
SIM800 provides an auxiliary ADC, which can be used to measure the voltage. Customerr can use AT command
"AT+CADC" to read the voltage value. For details of this AT command, please refer to document [1].
Table 24: ADC specification
Parameter
Voltage range
ADC Resolution
Sampling rate
ADC precision
Note: the voltage should less than 2.8V, or the ADC may be damaged.

4.15. PWM

Table 25: Pin definition of the PWM
Pin name
PWM0
PWM1
Note: SIM800 can only support 1 PWM synchronously, if customer set PIN 35 as PWM, so PIN36 can only be
used as GPIO.
PWM output frequency varies from 200Hz – 100KHz.Two 7-bit unsigned binary parameters are used for the
SIM800_Hardware Design_V1.10
t<1.9s
Figure 41: GPIO timing sequences
Pin number Description
25 Analog to Digital Converter
Min Typ
0 -
- 10
- -
10
Pin number Description
35 PWM0
36 PWM1
45
Smart Machine Smart Decision
t<1.9s
t<=10us
Max Unit
2.8 V
- bits
1.0833 MHz
30 mV
2018-08-13