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CLM920 TD3 LTE Module Hardware Usage Guide
name
41
I2C_SCL
42
I2C_SDA IO
I2C reference circuit connection is as follows：
3.13 SDIO interface
CLM920 TD3 module provides one 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.
Signal
Pin
I/O
name
23
SD_C
DI
ARD_
DET
SDC2_
28
IO
D3
Shanghai Yuge Information Technology co., LTD
I2C bus clock
DO
output
I2C bus data input
and output
Figure 3-22 I2C interface reference circuit diagram
Table 3-21 SD card pin definition
Descripti
Para
on
meter
SD card
VIH
insertion
VIL
detection
SDIO bus
VOH
DATA3
meter
Min
VOH
1.35
VOL
0
VOH
1.35
VOL
0
VIH
1.2
VIL
-0.3
Level value (V)
Min
Typical
1.2
1.8
-0.3
1.35
1.8
Typical
Max
1.8
2
0.45
1.8
2
0.45
1.8
2
0.6
Remarks
Max
2
0.6
2
1.8V voltage
domain
- 46 -
rks
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