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Figure 40: Reset circuit
Note
:
50ms<t<200ms. ESD components are suggested to be used on Reset pin.
3.12.2
ADC
SIM5215&SIM5216 has a dedicated ADC that is available for
digitizing analog signals such as battery
voltage and so on; it is on PIN 41, namely HKADC. This HKADC is 8 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
k
Ω
Sample and hold switch resistance
Input capacitance
53
pF
Power-down to wakeup
9.6
19.2
μ
s
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
SIM5215&SIM5216_Hardware Design_V2.02
2012-08-31
51
Содержание SIM5215
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