Hardware Design V1.00

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4.11. General Purpose Input/Output (GPIO)
SIM2000S provides 2 GPIO pins. The output voltage level of the GPIO can be set by AT command “AT+ SGPIO”.
The input voltage level of the GPIO can also be read by AT command “AT+ SGPIO”. For more details, please
refer to document [1].
Table 28: Pin definition of the GPIO
Pin name Pin number
Reset state
GPIO33 67 Output, pull down
GPIO34 68 Output, pull up
4.12. ADC
Table 29: Pin definition of the ADC
Pin name Pin number Description
ADC1 25 Analog voltage input
ADC2 36 Analog voltage input
SIM2000S provides two auxiliary ADC, which can be used to measure the voltage. User can use AT command
“AT+CADC” to read the voltage value. For details of this AT command, please refer to document [1].
Table 30: ADC specification
Parameter Min Typ Max Unit
Voltage range 0 2.5 V
ADC Resolution 12 bits
Sampling rate 2.4 MHz
ADC precision 20 30 mV
4.13. PWM
Table 31: Pin definition of the PWM
Pin name Pin number Description
PWM 35 Pulse Width Modulation
SIM2000S provides a PWM interface which can be used to drive a vibrator, and a backlight LED for display or
keyboard. PWM output frequency varies from 0 to 4.8MHz. AT command “AT + SPWM” is used to set the
output period and duty cycle of the PWM. For details, please refer to document [1].
SIM2000S_Hardware_Design_V1.00 40 2014-02-27