User's Manual

Smart Machine Smart Decision
SIM5320_Hardware Design_V1.01 2011-11-10
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Automatic power on
If user needs to power on SIM5320AD automatically whenever the VBAT pins are connected to the power
supply, then POWER_ON pin is just pulled to ground by a resistance in circuit directly. The following is
the reference circuit.
10 K
POWER _ON
Power
on
/off logic
200K
1.8V
MODULE
R1
RESET
Reset impulse
V
IL
<0. 3V
50ms<t<200ms
VBAT
RESET
( Input)
Figure 16: Application circuit
Note: After automatically powering on the module by pulling down POWER_ON pin to ground anytime, USB/UART may
not communicate normally with host, so it is suggested that SIM5320AD should be reset by RESET pin.
3.2.2 Power off Sequence
The following methods can be used to power down SIM5320AD. These procedures will make module
disconnect from the network and allow the software to enter a safe state, and then save data before
completely powering the module off.
● Method 1: Power off SIM5320AD by pulling the POWER_ON pin down
● Method 2: Power off SIM5320AD by AT command
User can power off the SIM5320AD by pulling POWER_ON down for a specific time. The power off
scenario is illustrated in the following figure.