Gemalto M2M GmbH MC56 User Manual

MC55/56 Hardware Interface Description 
Confidential / Preliminary 

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MC55/56_hd_v03.00 

Page 36 of 104 

16.08.2005 

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 MC55/56 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 27) the URC  
 

^SBC:  Undervoltage 

appears several times before the module switches off. 
 
 

For overvoltage conditions, no software controlled shutdown is implemented. If the supply 
voltage exceeds the maximum value specified in Table 27, loss of data and even 
unrecoverable hardware damage can occur.  
 
Keep in mind that several MC55/56 components are directly linked to BATT+ and, therefore, 
the supply voltage remains applied at major parts of MC55/56. Especially the power amplifier 
is very sensitive to high voltage and might even be destroyed.