CLM920 TD3 LTE Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 46 -
name
meter
rks
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 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.
Table 3-21 SD card pin definition
Pin
Signal
name
I/O
Descripti
on
Para
meter
Level value (V)
Remarks
Min
Typical Max
23
SD_C
ARD_
DET
DI
SD card
insertion
detection
VIH
1.2
1.8
2
VIL
-0.3
0.6
28
SDC2_
D3
IO
SDIO bus
DATA3
VOH 1.35
1.8
2
1.8V voltage
domain
