User's Guide

Table Of Contents

MC55i-W Hardware Interface Overview

5.2 Operating Temperatures

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MC55i-W_HIO_v01.301 Page 21 of 30 2011-3-8

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5.2 Operating Temperatures

Please note that the module’s lifetime, i.e., the MTTF (mean time to failure) may be reduced, if

operated outside the restriced temperature range. A special URC reports whether the module

enters or leaves the restriced temperature range (see [1]; AT^SCTM).

Note that within the specified operating temperature ranges the board temperature may vary

to a great extent depending on operating mode, used frequency band, radio output power and

current supply voltage.

When data are transmitted over GPRS the quad band module variant automatically reverts to

a lower Multislot Class if the temperature rises to the limit specified for normal operation and,

vice versa, returns to the higher Multislot Class if the temperature is back to normal.

Table 10: Board temperature

Parameter Min Typ Max Unit

Normal operation -30 +25 +85 °C

Restricted operation -40 to -30 +85 to +90 °C

Automatic shutdown

Temperature measured on MC55i-W board

Due to temperature measurement uncertainty, a tolerance of ±3°C on the thresholds may occur.

<-40 --- >+90 °C

Table 11: Ambient temperature according to IEC 60068-2 (w/o forced air circulation)

Parameter Min Typ Max Unit

GSM Call @ max. RF-Power -40 +75 °C

GPRS Class 8 @ max. RF-Power -40 +75 °C

GPRS Class 10 @ max. RF-Power (quad band only) -40 +60 °C

Table 12: Ambient temperature with forced air circulation (air speed 0.9m/s)

Parameter Min Typ Max Unit

GSM Call @ max. RF-Power -40 +80 °C

GPRS Class 8 @ max. RF-Power -40 +80 °C

GPRS Class 10 @ max. RF-Power (quad band only) -40 +70 °C