User's Manual

Shenzhen Neoway Technology Co., Ltd. Page 21 of 32

5) Pull DTR high, the module will exit from sleep mode actively, and furthermore enable the

UART. Thus the voice call, received data, or SMS can be processed through UART. After

processing finished pull it low again, to take the module back to sleep mode.

6.4.2 RING

1) Once the incoming voice call, the module sends out “ring” message through UART and

meanwhile outputs 250mS low pulses at 4S period on RING signal. See Figure 14.

Figure 14 RING indicator for incoming call

2) Upon receipt of SMS, the module outputs one 600mS low pulse. See Figure 15.

Figure 15 RING Indicator for SMS

6.5 SIM interface

Table5 SIM Interface

Signal

I/O

Function

Note

VSIM

PWR

SIM supply voltage

1.8/3.0V

SIM_CLK

SIM clock

SIM_RST

SIM reset

SIM_DATA

DIO

SIM data

Internal pull up