Hardware+Design V1.07

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Figure 40: Reset circuit
Note
： 50ms<t<200ms. ESD components are suggested to be used on Reset pin.
3.13.3 ADC
SIM5320 has a dedicated ADC that is available for digitizing analog signals such as battery voltage and so
on; it is on PIN 47 and PIN 46 , namely ADC1 and ADC2 . This ADC is 12 bit successive-approximation
circuit, and electronic specification is shown in the following table.
Table 32: Electronic Characteristics
Specification
Min Typ Max Unit Comments/Conditions
Resolution 12 Bits
Differential nonlinearity -4 +4 LSB
Integral nonlinearity -8 +8 LSB
Gain Error -2.5 +2.5 %
Offset Error -4 +40 LSB
Analog Vdd = ADC reference
2.4MHz sample rate
Input Range GND 2.2V V
Input serial resistance 2 kΩ Sample and hold switch resistance
Input capacitance 53 pF
Power-down to wakeup 9.6 19.2 μs
User can introduce a signal in the ADC pin directly and use the AT command “AT+CADC” to get the raw
data which is between 0 and 4095. The data can be transformed to any type such as voltage, temperature
etc. Please refer to document [1].
Figure 41: Reference circuit
SIM5320_Hardware Design_V1.07 2012-09-21
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