Siemens TC65 Specifications download pdf (Page 32)

TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 32 of 120 08.06.2006

3.3.1.3 Turn on TC65 Using the VCHARGE Signal

As detailed in Chapter 3.5.6, the charging adapter can be connected regardless of the

module’s operating mode.

If the charger is connected to the charger input of the external charging circuit and the

module’s VCHARGE pin while TC65 is off, and the battery voltage is above the undervoltage

lockout threshold, processor controlled fast charging starts (see Chapter

3.5.5). TC65 enters

a restricted mode, referred to as Charge-only mode where only the charging algorithm will

be launched.

During the Charge-only mode TC65 is neither logged on to the GSM network nor are the

serial interfaces fully accessible. To switch from Charge-only mode to Normal mode the

ignition line (IGT) must be pulled low for at least 2 seconds. When released, the IGT line

goes high and causes the module to enter the Normal mode. See also Chapter

3.3.1.1.

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Siemens TC65 Specifications Page 32