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TC65 Hardware Interface Description

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TC65_HD_V02.000 Page 28 of 120 08.06.2006

3.3 Power Up / Power Down Scenarios

In general, be sure not to turn on TC65 while it is beyond the safety limits of voltage and

temperature stated in Chapter

5. TC65 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 TC65

TC65 can be started in a variety of ways as described in the following chapters:

• Hardware driven start-up by IGT line: starts Normal mode or Airplane mode (see

3.3.1.1)

• Software controlled reset by AT+CFUN command: starts Normal mode or Airplane mode

(see

3.3.1.4)

• Hardware driven start-up by VCHARGE line: starts charging algorithm and charge-only

mode (see

3.3.1.3)

• 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

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].

3.3.1.1 Turn on TC65 Using Ignition Line IGT

When the TC65 module 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

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 Chapters

3.3.1.3 and 3.5.6.

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