Smart Machine Smart Decision
and so on; it is on PIN 13 and PIN 12 , namely ADC1 and ADC2 . This ADC is 12 bit
successive-approximation circuit, and electronic specification is shown in the following table.
Table 33: 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.
Figure 39: Reference circuit
Note: The input signal voltage value in ADC must not be higher than 2.2V.
3.13.4
LDO
SIM5320J-TE has a LDO power output, namely VREG_AUX. The LDO is available and output voltage is
2.6V by default, rated for 250mA. User can switch the LDO on or off by the AT command
“AT+CVAUXS” and configure its output voltage by the AT command “AT+CVAUXV”.
Table 34: Electronic characteristic
Symbol
Description
Min
Typ
Max
Unit
VREG_AUX
Output voltage
1.5
2.6
3.05
V
I
O
Output current
-
-
250
mA
SIM5320J-TE_Hardware Design_V1.01
2012-11-09
50