Ldo Power Output; Camera Module Interface - SimCom SIM5218E Hardware Design

SIM5218E Hardware Design
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．
You can put a voltage range from 0 to 2.65V on the pin directly using it as a raw type ADC
channel. The range of the return value is from 0 to 255.
Show a application sample:
You 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 0Ω, R2 is 47 kΩ and R3 is 68 kΩ 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, name VREG_AUX1.This LDO default output
voltage is 2.85V, and 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..

3.16 Camera module interface

SIM5218E provides a Camera module interface for supporting Camera and Video phone functions.
SIM5218E can support both digital and analog sensor(NTSC or PAL composite signals output),
YUV and RGB data format. When using analog sensor you needs to use AK8856(currently we
supported) to decode NTSC or PAL composite signals into digital data first and then transmit the
digital data into camera interface.
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SIM5218E_HD_V1.03 11.06.2009