Specifications

AC65/AC75 Hardware Interface Description
3.3 Power-Up / Power-Down Scenarios
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AC65_AC75_HD_v01.002 Page 33 of 117 2006-10-30
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3.3.1.4 Reset AC65/AC75 via AT+CFUN Command
To reset and restart the AC65/AC75 module use the command AT+CFUN. You can enter AT+CFUN=,1 or
AT+CFUN=x,1, where x may be in the range from 0 to 9. See [1] for details.
If configured to a fix baud rate (AT+IPR
≠0), the module will send the URC "^SYSSTART" or "^SYSSTART AIR-
PLANE MODE" to notify that it is ready to operate. If autobauding is enabled (AT+IPR=0) there will be no notifi-
cation. To register to the network SIM PIN authentication is necessary after restart.
3.3.1.5 Reset or Turn off AC65/AC75 in Case of Emergency
Caution: Use the EMERG_RST pin only when, due to serious problems, the software is not responding for more
than 5 seconds. Pulling the EMERG_RST pin causes the loss of all information stored in the volatile memory.
Therefore, this procedure is intended only for use in case of emergency, e.g. if AC65/AC75 does not respond, if
reset or shutdown via AT command fails.
The EMERG_RST signal is available on the application interface. To control the EMERG_RST line it is recom-
mended to use an open drain / collector driver.
The EMERG_RST line can be used to switch off or to reset the module. In any case the EMERG_RST line must
be pulled to ground for >
10ms. Then, after releasing the EMERG_RST line the module restarts if IGT is held low
for at least 400ms. Otherwise, if IGT is not low the module switches off. In this case, it can be restarted any time
as described in Section 3.3.1.1.
After hardware driven restart, notification via "^SYSSTART" or "^SYSSTART AIRPLANE" URC is the same as
in case of restart by IGT or AT command. To register to the network SIM PIN authentication is necessary after
restart.
3.3.1.6 Using EMERG_RST Signal to Reset Application(s) or External
Device(s)
When the module starts up, while IGT is held low for 400ms, the EMERG_RST signal goes low for 120ms as
shown in Figure 5 and Figure 6. During this 120ms period, EMERG_RST becomes an output which can be used
to reset application(s) or external device(s) connected to the module.
After the 120ms period, i.e. during operation of the module, the EMERG_RST is an input.
Specifications of the input and output mode of EMERG_RST can be found in Table 26.