Hardware Interface Description - Wireless Data Modules
Hardware Interface Description - Wireless Data Modules
Hardware Interface Description - Wireless Data Modules
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MC55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
5 Electrical, reliability and radio characteristics<br />
5.1 Absolute maximum ratings<br />
Absolute maximum ratings for supply voltage and voltages on digital and analog pins of<br />
MC55/56 are listed in Table 24. Exceeding these values will cause permanent damage to<br />
MC55/56.<br />
Table 24: Absolute maximum ratings<br />
Parameter Min Max Unit<br />
Voltage BATT+ -0.3 4.8 V<br />
Voltage at digital pins -0.3 3.3 V<br />
Voltage at analog pins -0.3 3.0 V<br />
Voltage at digital / analog pins in POWER DOWN mode -0.25 +0.25 V<br />
Voltage at POWER pin 15 V<br />
Voltage at CHARGE pin 15 V<br />
Differential load resistance between EPNx and EPPx 15 Ω<br />
5.2 Operating temperatures<br />
Test conditions were specified in accordance with IEC 60068-2 (still air). The values stated<br />
below are in compliance with GSM recommendation TS 51.010-01.<br />
Table 25: Operating temperatures<br />
Parameter Min Typ Max Unit<br />
Ambient temperature (according to GSM 11.10) -20 25 55 °C<br />
Restricted operation *) -25 to -20 55 to 70 ***) °C<br />
Automatic shutdown<br />
MC55/56 board temperature<br />
Battery temperature<br />
-29<br />
-18<br />
>70 **)<br />
>60<br />
Charging temperature (software controlled fast charging) 0 +45 °C<br />
°C<br />
°C<br />
*)<br />
**)<br />
***)<br />
MC55/56 works, but deviations from the GSM specification may occur.<br />
MC55/56 has the automatic shutdown set to 70°C at PCL5 (GSM 900 / GSM 850) GPRS Class<br />
8. This prevents permanent damage to components on the board. Consider the ratio of output<br />
power, supply voltage and operating temperature: To achieve T amb max = 70°C and, for example,<br />
GSM 900 / GSM 850 PCL5 the supply voltage must not be higher than 4.2V.<br />
To achieve T amb max = 70°C at permanent GPRS class 8 operation (4Tx, 1Rx, GSM 900 /<br />
GSM 850 at PCL5 with a supply voltage 4.2V) it is recommended to integrate MC55/56 in such<br />
a way that a minor heat exchange with the environment can take place. A solution might be the<br />
usage of a small heat sink.<br />
MC55/56_hd_v02.06 Page 74 of 105 29.10.2004