CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
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name
eter
arks
Min
Typical
Max
41
I2C_SCL
DO
I2C bus clock
output
VOH
1.35
1.8
2
VOL
0
0.45
42
I2C_SDA
IO
I2C bus data
input and
output
VOH
1.35
1.8
2
VOL
0
0.45
VIH
1.2
1.8
2
VIL
-0.3
0.6
I2C reference circuit connection is as follows
：
Figure 3-22 I2C interface reference circuit diagram
3.13 SDIO interface
CLM920 NC3 module provides a 4-bit SD/MMC interface, supports 1.8V/2.95V two
voltage SD cards, clock frequency up to 50MHz, maximum capacity support 32GB, support
SD3.0 protocol.
Table 3-19 SD card pin definition
Pin
Signal
name
I/O
Descrip
tion
Para
meter
Level value (V)
Remarks
Min
Typical
Max
23
SD_CAR
DI
SD card
VIH
1.2
1.8
2