Installation Instructions

SIM5216A _HD_V1.02 Hardware Design

SIM5216A _HD_V1.02 26.08.2010

*NOTE

：

STANDBY pin of SIM5216A 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 SIM5216A is shown below:

LOW: normal operation

HIGH: power-down

In Figure 26, the polarity of AK8856 power down is contrary to that of SIM5216A STANDBY,

so one must use a NPN triode to reverse the polarity of SIM5216A and connect AK8856.

If you do not use the camera interface you can configure these pins to configurable GPIOs.

Please refer the AT command Document (AT+CCGSWT).

3.17 MMC/SD card interface

SIM5216A provides one MMC/SD card interface. The SIM5216A acts as a HOST. The

SIM5216A 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 SIM5216A 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 SIM5216A 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 250mA. 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 good ESD performance, some ESD components should be added beside the

SD/MMC card holder.

The following features are implemented:

■ Supports 4-bit SD, 1-bit SD, and 1-bit MMC interface

■ SW-configurable edge latching (falling or rising)

■ SW-configurable data and command values change (rising or falling edge)

■ Clock-gating for power saving (and a power-saving option to always turn the clock off

when bus is idle)

■ Flow control option to prevent overflow and underflow

■ SD_CLK output up to 50 MHz

Following figure illustrate and describe the MMC/SD interface.