LPM2100 mg NB Module Hardware User Guide
Shanghai Yuge Information Technology Co., Ltd.
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3.10 I2C bus
The LPM2100 mg series module provides a set of hardware 5.0 protocol bidirectional
serial bus with a clock rate of 400KHZ and an interface voltage of IO output level.
Table 3-11 I2C pin definition
Pin Pin name IO
Functional description
Remarks
32
SCL
DO I2C bus clock output
Internal resistance pull-up
33
SDA
IO
I2C bus data input and output
Internal resistance pull-up
I2C reference circuit as shown below
：
Figure 3-20 I2C interface reference circuit
The I2C_SCL and I2C_SDA pins are internally pulled up, so the external pull-up resistor
can be ignored during use.
3.11 Network indication interface
*
The LPM2100 mg Series module provides a NETLIGHT pin to indicate network
communication status and can be used to drive LED lights that indicate network status.
Table 3-12 Network indicator pin definition
Pin
Pin name
I/O
Description
16
NETLIGHT
DO
Network status indication
Table 3-13 Network indication status
status
LED display status
Module not running or module not registered
Slow flash
Module is registering network
Fast flash
Module is connected to the network
Constantly bright
