Gemalto M2M GmbH AC75 Benutzerhandbuch
AC65/AC75 Hardware Interface Description
Confidential / Preliminary
Confidential / Preliminary
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AC65/AC75_hd_v00.372
Page 28 of 118
2006-08-03
3.3
Power-Up / Power-Down Scenarios
In general, be sure not to turn on AC65/AC75 while it is beyond the safety limits of voltage
and temperature stated in Chapter 5.1. AC65/AC75 would immediately switch off after having
started and detected these inappropriate conditions. In extreme cases this can cause
permanent damage to the module.
and temperature stated in Chapter 5.1. AC65/AC75 would immediately switch off after having
started and detected these inappropriate conditions. In extreme cases this can cause
permanent damage to the module.
3.3.1
Turn on AC65/AC75
AC65/AC75 can be started in a variety of ways as described in the following sections:
• Hardware driven start-up by IGT line: starts Normal mode or Airplane mode (see Section
• Hardware driven start-up by IGT line: starts Normal mode or Airplane mode (see Section
• Software controlled reset by AT+CFUN command: starts Normal mode or Airplane mode
• Hardware driven start-up by VCHARGE line: starts charging algorithm and Charge-only
• Wake-up from Power-down mode by using RTC interrupt: starts Airplane mode
The option whether to start into Normal mode or Airplane mode depends on the settings
made with the AT^SCFG command or AT+CALA. With AT+CALA, followed by AT^SMSO the
module can be configured to restart into Airplane mode at a scheduled alarm time. Switching
back and forth between Normal mode and Airplane mode is possible any time during
operation by using the AT^SCFG command.
After startup or mode change the following URCs indicate the module’s ready state:
• “SYSSTART” indicates that the module has entered Normal mode.
• “^SYSSTART AIRPLANE MODE” indicates that the module has entered Airplane mode.
• “^SYSSTART CHARGE ONLY MODE” indicates that the module has entered the
The option whether to start into Normal mode or Airplane mode depends on the settings
made with the AT^SCFG command or AT+CALA. With AT+CALA, followed by AT^SMSO the
module can be configured to restart into Airplane mode at a scheduled alarm time. Switching
back and forth between Normal mode and Airplane mode is possible any time during
operation by using the AT^SCFG command.
After startup or mode change the following URCs indicate the module’s ready state:
• “SYSSTART” indicates that the module has entered Normal mode.
• “^SYSSTART AIRPLANE MODE” indicates that the module has entered Airplane mode.
• “^SYSSTART CHARGE ONLY MODE” indicates that the module has entered the
Charge-only mode.
These URCs are indicated only if the module is set to a fixed bit rate, i.e. they do not appear
if autobauding is enabled (AT+IPR≠0).
Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA, Airplane mode and AT+IPR can
be found in [1].
if autobauding is enabled (AT+IPR≠0).
Detailed explanations on AT^SCFG, AT+CFUN, AT+CALA, Airplane mode and AT+IPR can
be found in [1].
3.3.1.1
Turn on AC65/AC75 Using Ignition Line IGT
When AC65/AC75 is in Power-down mode or Charge-only mode, it can be started to Normal
mode or Airplane mode by driving the IGT (ignition) line to ground. This must be
accomplished with an open drain/collector driver to avoid current flowing into this pin.
The module will start up when both of the following two conditions are met:
• The supply voltage applied at BATT+ must be in the operating range.
• The IGT line needs to be driven low for at least 400ms in Power-down mode or at least
mode or Airplane mode by driving the IGT (ignition) line to ground. This must be
accomplished with an open drain/collector driver to avoid current flowing into this pin.
The module will start up when both of the following two conditions are met:
• The supply voltage applied at BATT+ must be in the operating range.
• The IGT line needs to be driven low for at least 400ms in Power-down mode or at least
2s in Charge-only mode. When released IGT goes high and causes the module to start.
Considering different strategies of host application design the figures below show two
approaches to meet this requirement: The example in Figure 5 assumes that IGT is activated
after BATT+ has already been applied. The example in Figure 6 assumes that IGT is held
low before BATT+ is switched on. In either case, to power on the module, ensure that low
state of IGT takes at least 400ms (Power-down mode) or 2s (Charge-only mode) from the
moment the voltage at BATT+ is available. For Charge-only mode see also Chapter 3.5.6.