Hardware Design

Smart Machine Smart Decision
SIM8200EA-M2 card Hardware Design _V1.01 23 2019-06-27
RESET#
(Input)
T
wait
3V3
FUL_CARD_POWER_OFF#
(Input)
USB Port
Undefined
Active
T
on(usb)
Power off
Figure 8: Power on timing sequence
Table 8: Power on timing and electronic characteristic
Symbol Parameter Min. Typ. Max. Unit
T
wait
The time which is used to wait the 3.3v to be stable. TBD - - ms
T
on(usb)
The time from power-on issue to USB port ready - TBD - s
V
IH
Input high level voltage on
FUL_CARD_POWER_OFF# pin
1.0 1.7 4.4 V
V
IL
Input low level voltage on FUL_CARD_POWER_OFF#
pin
-0.3 0 0.2 V
3.3.2 Power off
The following methods can be used to power off the card.
● Method 1: Power off the card by holding the FUL_CARD_POWER_OFF# pin to a low level.
● Method 2: Power off Module by AT command “AT+CPOF”.
● Method 3: over-voltage or under-voltage automatic power off.
● Method 4: over-temperature or under-temperature automatic power off.
Note: If the temperature is outside the range of -30~+75
℃
, some warning will be reported via AT
port. If the temperature is outside the range of -40~+85
℃
, Module will be powered off
automatically.
For details about “AT+CPOF”, please refer to Document [1] in the appendix.
These procedures will make the M.2 card disconnect from the network and allow the software to
enter a safe state, and save data before the card be powered off completely.
The power off scenario by pulling down the FUL_CARD_POWER_OFF# pin is illustrated in the
following figure.
SIMCom Confidential File