Integra M2106+
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WA_DE_PTS_003-001
April, 2007
an AT command.
Note
:
See also “AT Commands Interface Guide” [7] for more information on these commands.
Proceeding thus – by software detection - will always prevent the application from de-asserting the ON/~OFF
signal too early.
If WIND indicators are disabled or AT commands unavailable or not used, it is still possible to de-assert
ON/~OFF after a delay long enough (
T
on-hold
) to ensure that the firmware has already completed its power-up
initialization.
The table below gives the minimum values of
T
on-hold
for all firmware versions:
T
on-hold
minimum values
T
on-hold
Open AT
®
Firmware
Safe evaluations of the firmware power-up
time
6.57 & above
8 s
The above figures take the worst cases into account: power-loss recovery operations, slow flash memory
operations in high temperature conditions, and so on. But they are safe because they are large enough to
ensure that ON/~OFF is not de-asserted too early.
Additional notes:
1.
Typical power-up initialization time figures for best cases conditions (no power-loss recovery, fast
and new flash memory…) approximate 3.5 seconds in every firmware version. But releasing
ON/~OFF after this delay does not guarantee that the application will actually start-up if for
example the power plug has been pulled off during a flash memory operation, like a phone book
entry update or an AT&W command.
2.
The ON/~OFF signal can be left at a high level until switch OFF. But this is not recommended as it
will prevent the AT+CPOF command from performing a clean power-off. (see also Note in section
3.3.2.2 Power-OFF for an alternate usage).
3.
When using a battery as power source, it is not recommended to let this signal high:
If the battery voltage is too low and the ON/~OFF signal at low level, an internal mechanism
switches OFF the Wireless CPU
®
. This automatic process prevents the battery to be over
discharged and optimize its life span.
4.
During the power-ON sequence, an internal reset is automatically performed by the Wireless
CPU
®
for 42 ms (typical). Any external reset should be avoided during this phase.
3.3.2.2
Power-OFF
To properly power-OFF the Integra Wireless CPU
®
, the application must reset the ON/~OFF signal to low
and then send the AT+CPOF command to de-register from the network and switch off the Wireless CPU
®
.
Once the « OK » response is issued by the Wireless CPU
®
, the external power supply can be switched off.
