User's Manual

Smart Machine Smart Decision
SIM7600SA-H_User Manual_V1.00 2017-10-11
Module
SD Card
VCC
GND
CMD
D3
SD_CMD
SD_DATA3
SD_DATA1
SD_DATA2
TVS
SD_DATA0
SD_CLK
TVS TVS TVS TVS TVS
100nF
4.7uF
D2
D1
D0
CLK
GND
VDD_SD
Figure 25: SD reference circuit
SD card layout guide lines:
● Protect other sensitive signals/circuits from SD card signals.
● Protect SD card signals from noisy signals (clocks, SMPS, etc.).
● Up to 200 MHz clock rate, 50 Ω nominal, ±10% trace impedance
● CLK to DATA/CMD length matching < 1 mm
● 15–24 Ω termination resistor on clock lines near module
● Total routing length < 50 mm recommended
● Routing distance from module clock pin to termination resistor < 5 mm
● Spacing to all other signals = 2x line width
● Bus capacitance < 15 pF
3.8 I2C Interface
SIM7600SA-H provides a I2C interface compatible with I2C specification, version 5.0, with clock
rate up to 400 kbps. Its operation voltage is 1.8V.
The following figure shows the I2C bus reference design.
Module
SDA
Module
SDA
GNDGND
SCL
SCL
VDD_1V8
2.2K
2.2K
Figure 26: I2C reference circuit