Table 9: Power Off Timing And Electronic Characteristic - SimCom SIM7000 Hardware Design

PWRKER
( Input)
VDD_ EXT
( Output )
STATUS
( Output )
UART Port
USB Port

Table 9: Power off timing and electronic characteristic

Symbol Parameter
The active low level time pulse on PWRKEY pin to
T
off
power off module
The time from power-off issue to VDD_EXT pin output
T
off(vdd)
low level
The time from power-off issue to STATUS pin output low
T
off(status)
level(indicating power off )*
T The time from power-off issue to UART port off
off(uart)
T The time from power-off issue to USB port off
off(usb)
T The buffer time from power-off issue to power-on issue
off-on
*Note: The STATUS pin can be used to detect whether module is powered on or not. When
module has been powered on and firmware goes ready, STATUS will be high level, or else
STATUS will still low level.
SIM7000 _Hardware Design _V1.04
T
off
T
off
T
off( status )
T
off( uart )
active
T
active
Figure 11: Power off timing sequence
Smart Machine Smart Decision
T
off- on
(vdd)
Undefined
off( usb )
Undefined
Min.
1.2
1.8
1.8
1.8
1.8
2
T
on
Time value
Unit
Typ. Max.
- - s
- 6.9 s
- 6.9 s
- 6.9 s
- 6.9 s
- - s
2018-1-31