Restart The Gsm Part Using The Pwrkey Pin; Charging Interface - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design
For details please refer to document [1]

3.4.3 Restart the GSM part using the PWRKEY pin

You can restart the module by driving the PWRKEY to a low level voltage for some time, the
same as turning on the module using the PWRKEY pin. Before restarting the module, you need
delay at least 500ms from detecting the STATUS low level on. The restarting scenarios illustrates
as the following figure.
STATUS
V <0.6V
IL
Figure 9: Timing of restart GSM part

3.5 Charging interface

The GSM part of the module has integrated a charging circuit for Li-Ion batteries charging control,
which make it very convenient for applications to manage their battery charging.
A common connection is shown in the following figure:
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SIM548C_HD_V1.01 09.05.2008