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written agreement.
WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.14
ON / ~OFF signal
This input is used to switch the Q2686 Wireless CPU
®
ON or OFF.
A high-level signal must be provided on the ON/~OFF pin to switch ON the
Wireless CPU
®
. The voltage of this signal has to be maintained higher than 0.8
x VBATT during a minimum of 1500ms. This signal can be left at high level
until switch-off.
To switch OFF the Wireless CPU
®
, the ON/OFF pin must be released. The
Wireless CPU
®
can be switched off via the Operating System.
Pin description
Signal
Pin number
I/O
I/O type
Description
ON/
∼
OFF
19 I
CMOS Wireless
CPU
®
Power-ON
Electrical characteristics of the signals
Parameter
I/O type
Minimum
Maximum
Unit
V
IL
CMOS
VBATT
x
0.2
V
V
IH
CMOS
VBATT
x
0.8
VBATT V
Warning:
All external signals must be inactive when the Wireless CPU
®
is OFF to avoid
any damage when starting and allow the Wireless CPU
®
to start and stop
correctly.
3.14.1
Operating Sequences
3.14.1.1
Power-ON
Once the Wireless CPU
®
is supplied, the application must set the ON/OFF
signal to high to start the Wireless CPU
®
power-ON sequence. The ON/OFF
signal must be held high during a minimum delay of T
on/off-hold
(Minimum hold
delay on the ON/~OFF signal) to power-ON. After this delay, an internal
mechanism maintains the Wireless CPU
®
in power-ON condition.
During the power-ON sequence, an internal reset is automatically performed by
the Wireless CPU
®
for 40ms (typical). Any external reset should be avoided
during this phase.
Once initialization is completed (timing is SIM- and network-dependent), the
AT interface answers "OK" to the application. For further details, please check
the AT Commands User Guide [7].