User Manual

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SIM7100_Hardware_Design_V1.02 2015-06-16

Figure 32: ISINK Reference Circuit

Note: The sinking current can be adjusted to meet the design requirement through the AT

command “AT+ CLEDITST =<0>, <value>”.The “value” ranges from 0 to 8, on behalf of the

current from 0mA to 40mA by 5mA step.

3.14.2 ADC

SIM7100 has 2 dedicated ADC pins named ADC1 and ADC2.They are available for digitizing

analog signals such as battery voltage and so on. These electronic specifications are shown in the

following table.

Table 22: ADC1 and ADC2 Electronic Characteristics

Characteristics

Min. Typ. Max. Unit

Resolution

–

Bits

Conversion time

–

442

–

Input Range

0.3

VBAT

Input serial resistance 1

– –

MΩ

Note: “AT+CADC” and “AT+CADC2” can be used to read the voltage of the ADC1 and ADC2

pins, for more details, please refer to document [1].