User's Manual

Smart Machine Smart Decision
SIM7600NA-H_user manual _V1.00 42 2020-1-7
Figure 268: Audio codec reference circuit
3.9 SD Interface
MODULE provides a 4-bit SD/MMC/eMMC interface with clock rate up to 200 MHz.
When connected to a SD or MMC card, the voltage of SD interface is 1.8/2.85V, which is
compatible with Secure Digital Physical Layer Specification version 3.0 and SDIO Card
Specification version 3.0.It supports up to 128GB SD cards.
When connected to a eMMC card, the interface voltage will be a single 1.8V, which is compatible
with eMMC Specification, version 4.5. It supports up to 128GB eMMC cards.
Table 17
: SD/MMC electronic characteristic as 2.85V (SD_DATA0-3，SD_CLK and
SD_CMD)
Symbol Parameter
Min. Typ. Max. Unit
V
IH
High-level input voltage
0.65*2.85 - 2.85+0.3 V
V
IL
Low-level input voltage
-0.3 0 0.25*2.85 V
V
OH
High-level output voltage
0.75*2.85 2.85 2.85
V
V
OL
Low-level output voltage
0 0 0.15*2.85 V
Table 18: SD/MMC/eMMC electronic characteristic as 1.8V (SD_DATA0-3，SD_CLK
and SD_CMD)
Symbol Parameter
Min. Typ. Max. Unit
V
IH
High-level input voltage
0.7*1.8 - 1.8+0.2 V
V
IL
Low-level input voltage
-0.3 0 0.3*1.8 V
V
OH
High-level output voltage
1.8-0.4 1.8 1.8
V
V
OL
Low-level output voltage
0 0 0.45 V