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SIM7600NA_user manual _V1.00 45
2020-1-7
3.12
SPI Interface
SIM7600NA provides a SPI interface as a master only. It provides a duplex, synchronous, serial
communication link with peripheral devices. Its operation voltage is 1.8V, with clock rates up to 50
MHz
Note
：
For more details of the AT commands about the SPI, please refer to document [1].
3.13
Network status
The NETLIGHT pin is used to control Network Status LED, its reference circuit is shown in the
following figure.
Figure32: NETLIGHT reference circuit
Note: The value of the resistor named “R” depends on the LED characteristic.
Table 19: NETLIGHT pin status
NETLIGHT pin status
Module status
Always On
Searching Network; Call Connect(include VOLTE,SRLTE)
200ms ON, 200ms OFF
Data Transmit; 4G registered;
800ms ON, 800ms OFF
2G/3G registered network
OFF
Power off ;Sleep
Note: NETLIGHT output low level as “OFF”, and high level as “ON”.