Product Info

Smart Module Series
SC600Y&SC600T Hardware Design
SC600Y&SC600T_Hardware_Design 55 / 134
SD_LDO11 is a peripheral driver power supply for SD card. The maximum drive current is approximate
800mA. Because of the high drive current, it is recommended that the trace width is 0.5mm or above. In
order to ensure the stability of drive power, a 4.7uF and a 33pF capacitor should be added in parallel near
the SD card connector.
CMD, CLK, DATA0, DATA1, DATA2 and DATA3 are all high speed signal lines. In PCB design, please
control the characteristic impedance of them to 50Ω, and do not cross them with other traces. It is
recommended to route the trace on the inner layer of PCB, and keep the same trace length for CLK, CMD,
DATA0, DATA1, DATA2 and DATA3. CLK should be encircled by ground traces separately.
Layout guidelines:
 Control impedance to 50Ω±10%, and DATA0, DATA1, DATA2 and DATA3 should be encircled by
ground traces.
 The total trace length difference between CLK and other signal line traces should not exceed 1mm.
Table 15: SD Card Signal Trace Length Inside the Module
Pin No. Signal Length (mm) Comment
70 SD_CLK 32.11
69 SD_CMD 32.11
68 SD_DATA0 32.11
67 SD_DATA1 32.11
66 SD_DATA2 32.11
65 SD_DATA3 32.11