User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document History
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- List of parts and accessories
MC46 Hardware Interface Description
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MC46_HD_V03.05 Page 34 of 99 13.11.2003
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 MC46 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 specified value (see Table 28) the URC
^SBC: Undervoltage
appears several times before the module switches off.
3.3.3.5 Overvoltage shutdown
For overvoltage conditions, no software controlled shutdown is implemented. If the supply
voltage exceeds the maximum value specified in Table 28, loss of data and even
unrecoverable hardware damage can occur.
Keep in mind that several MC46 components are directly linked to BATT+ and, therefore, the
supply voltage remains applied at major parts of MC46. Especially the power amplifier is very
sensitive to high voltage and might even be destroyed.