Siemens TC65 Specifications download pdf (Page 41)

TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 41 of 120 08.06.2006

3.3.4.4 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.

This type of URC does not need to be activated by the user. It will be output automatically

when fault conditions occur.

3.3.4.5 Overvoltage Shutdown

The overvoltage shutdown threshold is 100mV above the maximum supply voltage V

BATT+

specified in

Table 27.

When the supply voltage approaches the overvoltage shutdown threshold the module will

send the URC

^SBC: Overvoltage warning.

This alert is sent once.

When the overvoltage shutdown threshold is exceeded the module will send the URC

^SBC: Overvoltage shutdown,

before it shuts down cleanly.

This type of URC does not need to be activated by the user. It will be output automatically

when fault conditions occur.

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.

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Siemens TC65 Specifications Page 41