User's Manual

Smart Machine Smart Decision
SIM868_Hardware_Design_V1.00 40 2016-06-20
Pin name Pin number Mode 0(default) Mode 1
SCL 65 SCL GPIO
SDA 64 SDA GPIO
Note: Customer can use AT command set mode. For detail, please refer to document t[1].
4.11. ADC
Table 23: Pin definition of the ADC
SIM868 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: Customer can use AT command set mode. For detail, please refer to document t[1].
Table 24: ADC specification
Parameter Min Typ Max Unit
Voltage range 0 - 2.8 V
ADC Resolution - 10 - bits
RIN
Input resistance
Unselected channel
Selected channel
400
1
M
M
CIN
Input capacitance
Unselected channel
Selected channel
50
4
fF
pF
Sampling rate - - 1.08 MHz
ADC precision 10 30 mV
4.12. Network Status Indication
Table 25: Pin definition of the NETLIGHT
The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in
following table:
Table 26: Status of the NETLIGHT pin
Status
SIM868
behavior
Off
Powered off
64ms On/ 800ms Off
Not registered the network
64ms On/ 3000ms Off
Registered to
the network
64ms On/ 300ms Off
GPRS communication is established
Pin name Pin number Description
ADC 38 Analog voltage input
Pin name Pin number Description
NETLIGHT
41
Network Status Indication