User's Manual

TC65 Hardware Interface Description

Strictly confidential / Draft

TC65_HD_V00.450 Page 34 of 96 20.04.2005

3.3.3.4 Undervoltage Shutdown if no Battery NTC is Present

The undervoltage protection is also effective in applications, where no NTC connects to the

BATT_TEMP terminal. Thus, you can take advantage of this feature even though the

application handles the charging process or TC65 is fed by a fixed supply voltage. All you

need to do is executing the write command AT^SBC=<current> which automatically enables

the presentation of URCs. You do not need to specify <current>.

Whenever the supply voltage falls below the value of 3.2V the URC

^SBC: Undervoltage

appears several times before the module switches off.

3.3.3.5 Overvoltage Shutdown

In the event of the maximum voltage of 4.6V is reached the module sends a URC and then

performs an orderly shutdown. Further details: TBD

Keep in mind that several TC65 components are directly linked to BATT+ and, therefore, the

supply voltage remains applied at major parts of TC65, even if the module is switched off.

Especially the power amplifier is very sensitive to high voltage and might even be destroyed.