SIM Tech SimCom SIM5218E, Проектирование аппаратного обеспечения

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SIM5218E Hardware Design
Table 24: PIN define of sensor interface
Pin Name Function Lever
14 CAM_D0 Bit 0 of RGB video component output
55 CAM_D1 Bit 1 of RGB video component output
15 CAM_D2 Bit 2 of RGB or YUV D0 video component output
54 CAM_D3 Bit 3 of RGB or YUV D1 video component output
16 CAM_D4 Bit 4 of RGB or YUV D2 video component output
53 CAM_D5 Bit 5 of RGB or YUV D3 video component output
17 CAM_D6 Bit 6 of RGB or YUV D4 video component output
52 CAM_D7 Bit 7 of RGB or YUV D5 video component output
18 CAM_D8 Bit 8 of RGB or YUV D6 video component output
51 CAM_D9 Bit 9 of RGB or YUV D7 video component output
19 CAM_HSYNC Video horizontal line synchronization signal
50 CAM_VSYNC Vertical sync output
21 CAM_CLK master clock input
49 CAM_PCLK Pixel clock output
48 CAM_RESET Master reset input, active low
47 IIC_SDA Serial interface data input and output
46 IIC_SCL Serial interface clock input
20 GND Ground
22 CAM_STANDBY Power-down mode selection
“1”=Normal mode, “0”=Power-down mode
*Note
：
Camera module interface function is just supported by SIM5218E software.
We have tested several kinds of digital sensors, such as OV2640, OV7670
，
OV7725 and a
NTSC/PAL digital video decoder named AK8856 (it can decode NTSC or PAL composite video
signals into digital video data, and with AK8856 user can use analog sensor as video source).
Software must be adjusted when use other kinds of sensors. Custom can contact us and give us
user’s request. The power supply of the sensor should be supplied by custom.
3.17 MMC/SD card interface
SIM5218E provides one MMC/SD card interface. The SIM5218E acts as a HOST. The SIM5218E
device has a 4-bit SD interface. It supports 4 bits of data and a command signal. In addition, a
clock output is provided by the SIM5218E to be used as SD_CLK, or MMC_CLK. This clock is
designed to be used with the MMC/SD interface and is what customers should use with the
MMC/SD cards. A LDO power output is provided by the SIM5218E for the power supply of
MMC/SD card, it is PIN 40, name VREG_AUX. This LDO default output voltage is 2.85V, and
driver current is rated for 150mA. Meanwhile data lines can be pulled up by VREG_AUX. The
reference circuit of MMC/SD card interface is shown in Figure 27. The 10KR pull-up resistors on
data and clk lines are necessary. The 33pF capacitor is used to reduce RF interference. To get
SIM5218E_ Hardware Design_V1.06 2012.09.21
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