SIM5218E Hardware Design
wakeup
Throughput rate
40.95 67.58
kHz
We implement two channels on this pin, one is read in raw type ADC value, and the other is read
in temperature type ADC value
．
User can put a voltage range from 0 to 2.6V on the pin directly using it as a raw type ADC channel.
The range of the return value is from 0 to 255.
Show an application sample:
User can use it as a temperature ADC channel, too. The reference design of a temperature ADC
circuit is such as the figure below. R1 is 0
Ω
, R2 is 47 k
Ω
and R3 is 68 k
Ω
for reference. The
VREF should be 2.65V. The range of the return value is from -30 to 150.
Figure 24
：
ADC interface used for temperature sampling reference circuit
3.15 LDO power output
SIM5218E has a LDO power output, it is PIN 40, namely VREG_AUX1.This LDO default output
voltage is 2.85V, and the driver current is rated for 150mA. This LDO could be used as a power
supply for SD card, and the SD card data/command lines can also been pulled up by it.. One can
switch the LDO by AT+CVAUXS also one can set the LDO’s output voltage by AT+CVAUXV.
NOTE
：
SIM5210 has no such pin. This is a difference between SIM5218E and SIM5210.
SIM5218E_ Hardware Design_V1.06
2012.09.21
43
Содержание SimCom SIM5218E
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