Power Off Sequence - SimCom SIM5215 Hardware Design

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.
Table 7: Power off timing
Parameter
Toff The time pulling POWER_ON down to power off
TpD- The time to indicate disconnecting from the network
Tpw- The time to indicate the module power off completely
Tuart_off The time to disable UART
Tusb_off The time to disable USB
SIM5215&SIM5216_Hardware Design_V2.02
Figure 17: Power off timing sequence
Description
27
Smart Machine Smart Decision
Time value
Min. Typ. Max. Unit
0.5 - 5
- - 7
- - 7.5
- - 6
- - 7.5
2012-08-31
s
s
s
s
s