MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a Page 76 of 90 12.08.2002
6 Electrical, reliability and radio characteristics
6.1 Absolute maximum ratings
Absolute maximum ratings for supply voltage and voltages on digital and analog pins of
MC45 are listed in Table 26. Exceeding these values will cause permanent damage to
MC45.
The power supply shall be compliant with the SELV safety standard defined in EN60950.
The supply current must be limited according to Table 26.
Table 26: Absolute maximum ratings
Parameter Min Max Unit
Peak current of power supply 0 4.0 A
RMS current of power supply (during one TDMA-frame) 0 0.7 A
Voltage at digital pins -0.3 3.3 V
Voltage at analog pins -0.3 3.0 V
Voltage at digital / analog pins in POWER DOWN mode -0.25 +0.25 V
Voltage at POWER pin 15 V
Voltage at CHARGE pin 15 V
Differential load resistance between EPNx and EPPx 15
W
6.2 Operating temperatures
Test conditions were specified in accordance with IEC 60068-2 (still air).
Table 27: Operating temperatures
Parameter Min Typ Max Unit
Ambient temperature (according to GSM 11.10) -20 25 55 °C
Restricted operation
*)
-25 to -20 55 to 70 °C
Automatic shutdown
MC45 board temperature
Battery temperature
-29
-18
>70
**)
>60
°C
°C
Charging temperature (software controlled fast charging) 0 +45 °C
*)
MC45 works, but deviations from the GSM specification may occur.
**)
T
amb max
= 70°C, conditions: GSM 900 PCL and V
BATT+
max
<4.0V
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