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Smart Machine Smart Decision
3.2.2
Power off Sequence
The following methods can be used to power down SIM5215&SIM5216. 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 SIM5215&SIM5216 by pulling the POWER_ON pin down
●
Method 2: Power off SIM5215&SIM5216 by AT command
User can power off the SIM5215&SIM5216 by pulling POWER_ON down for a specific time. The power
off scenario is illustrated in the following figure.
Figure 17: Power off timing sequence
Table 7: Power off timing
Time value
Parameter
Description
Min.
Typ.
Max.
Unit
Toff
The time pulling POWER_ON down to power off
0.5
-
5
s
TpD-
The time to indicate disconnecting from the network
-
-
7
s
Tpw-
The time to indicate the module power off completely
-
-
7.5
s
Tuart_off
The time to disable UART
-
-
6
s
Tusb_off
The time to disable USB
-
-
7.5
s
SIM5215&SIM5216_Hardware Design_V2.02
2012-08-31
27
Содержание SIM5215
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