User's Manual

Smart Machine Smart Decision

SIM868_Hardware_Design_V1.00 41 2016-06-20

Reference circuit is recommended in the following figure:

Module

NETLIGHT

VBAT

4.7K

47K

Figure 35: Reference circuit of NETLIGHT

Table 27: NETLIGHT multiplexing function

Pin name Pin number Mode 0(default) Mode 1

NETLIGHT 41 NETLIGHT GPIO

Note: Customer can use AT command set mode. For detail, please refer to document t[1].

4.13. Operating Status Indication

The pin42 is for operating status indication of the module. The pin output is high when module is powered on,

and output is low when module is powered off.

Table 28: Pin definition of the STATUS

Pin name Pin number Description

STATUS 42 Operating status indication

Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios”

4.14. RF Synchronization Signal

The synchronization signal serves to indicate growing power consumption during the transmit burst.

Table 29: Definition of the RF_SYNC pin

The timing of the synchronization signal is shown in the following figure. High level of the RF_SYNC signal

indicates increased power consumption during transmission.

Pin name Pin number Description

RF_SYNC 29 Transmit synchronization signal