Smart Machine Smart Decision
SIM5320JE-TE_Hardware Design_V1.01
2012-07-10
26
Table
6
: Power on timing
Parameter
Description
Time value
Unit
Ton
The time to pull POWER_ON down to power on
64< Ton<180
ms
TpD+
The time to indicate connecting with the network
>5.5
s
Tpw+
The time to indicate the module is powered on
completely
>4.5
s
Tuart
The time to enable UART
>4.7
s
Tusb
The time to enable USB
>9
s
Automatic power on
If user needs to power on SIM5320JE-TE 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
17
: Application circuit
Note:
1.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 SIM5320JE-TE should be reset by RESET pin.
2.When POWER_ON pin is pulled down to ground ,the user can not use AT command "AT + CPOF"
to power down the
module .
3.2.2
Power off Sequence
The following methods can be used to power down SIM5320JE-TE. These procedures will make module
disconnect from the network and allow the software to enter a safe state, and then save data before
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