Smart Machine Smart Decision
Tusb
The time to enable USB
-
-
9
s
Note: Module could be automatically power on by connecting Power ON pin to Low level directly.
Before designing, please refer to Document [27] for more detail.
3.2.2
Power off Sequence
The following methods can be used to power down SIM5320J-TE. 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 SIM5320J-TE by pulling the POWER_ON pin down
●
Method 2: Power off SIM5320J-TE by AT command
User can power off the SIM5320J-TE by pulling POWER_ON down for a specific time. The power off
scenario is illustrated in the following figure.
STATUS_LED
(Output)
V
IL
<0.3V
Toff
POWER_ON
( Input)
Tpd-
Serial Port
Undefined
Active
USB Port
Undefined
Active
POWER_ON_IND
(VREG_AUX)
(Output)
Tpw-
Tuart_off
Tusb_off
V
IL
<0.3V
Ton
Tona
Figure 17: Power off timing sequence
Table 7: Power off timing
Time value
Parameter
Description
Min.
Typ.
Max.
Unit
SIM5320J-TE_Hardware Design_V1.01
2012-11-09
26