Sd Card Interface - Quectel SC262R Series Hardware Design

⚫
In order to ensure good ESD protection, it is recommended to add a TVS array with parasitic
capacitance not exceeding 50 pF. Add 22 Ω resistors in series between the module and (U)SIM card
to suppress EMI spurious transmission and enhance ESD protection. Please note that the (U)SIM
peripheral circuit should be close to the (U)SIM card connector.
⚫
Add 22 pF capacitors in parallel on USIM_DATA, USIM_CLK and USIM_RST signal lines to filter RF
interference, and place them as close to the
⚫
Place the reserved pull-up resistors R6 and R5 in Figure 16: Reference Circuit for (U)SIM Interface
with an 8-pin (U)SIM Card Connector and Figure 17: Reference Circuit for (U)SIM Interface with a
6-pin (U)SIM Card Connector close to the module.

3.12. SD Card Interface

SD Card interface of SC262R series module supports SD 3.0 protocol. The pin definition of SD card
interface is shown below.
Table 13: Pin Definition of SD Card Interface
Pin Name Pin No.
SD_CLK 39
SD_CMD 40
SD_DATA0 41
SD_DATA1 42
SD_DATA2 43
SD_DATA3 44
SD_DET 45
SD_LDO11 38
SD_LDO12 32
A reference circuit for the SD card interface is shown below.
SC262R_Series_Hardware_Design
(U)SIM
I/O Description
DO SD card clock
DIO SD card command
DIO SDIO data bit 0
DIO SDIO data bit 1
DIO SDIO data bit 2
DIO SDIO data bit 3
DI SD card hot-plug detect
PO SD card power supply
1.8/2.95 V output power supply for SD
PO
card pull-up circuits.
card connector as possible.
Smart Module Series
Comment
50 Ω characteristic
impedance.
Active low.
Vnom = 2.95 V
I max = 800 mA
O
Vnom = 1.8/2.95 V
I max = 50 mA
O
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