SIM5218E Hardware Design
SIM5218E_ Hardware Design_V1.06
2012.09.21
45
SIM5218
AK8856
DATA(2:9)
VSYNC
PCLK
I2C
VD/VAF/FIELD
D(0:7)
DTCLK
SCL/SDA
CLK
27Mhz
crystal
2.6V
10K
STANDBY
HSYNC
DVALID
20K
20K
NTSC/PAL
video source
Analog input
PDN
TEST1
CLKMOD
TEST0
AVDD/DVDD
PVDD
2.6V
1.8V
CAM_CLK NC
Figure 26
:
Camera module interface with analog sensor
*NOTE
:
1. STANDBY pin of SIM5218E is used to control the powering down or on of camera module.
So when one designs application circuit, one should pay attention to the
polarity of STANDBY.
Default polarity of SIM5218E is shown below:
LOW: normal operation
HIGH: power-down
In Figure 26, the polarity of AK8856 power down is contrary to that of SIM5218E STANDBY,
so one must use a NPN triode to reverse the polarity of SIM5218E and connect AK8856.
2. AK8856 PAL
analog sensor input mode: at+ccammd=0. It is the default setting.
AK8856 NTSC
analog sensor input mode: at+ccammd=1.
3. AK8856 provides two analog sensor input port. Users can choose one from two input ports by
AT+CCAMCHL. The first analog input port is the default setting.
4. Please refer document [1] and SIM52xx_Camera_Interface_Application for detail
information.
5. If user do not use the camera interface user can configure these pins to configurable GPIOs.
Please refer the AT command Document (AT+CCGSWT).
The following table is the pin definition.
Содержание SimCom SIM5218E
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