Specifications

MC55/56 Hardware Interface Description
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MC55/56_hd_v04.00a Page 76 of 108 24.08.2006
5.2 Operating temperatures
Table 25: Board / battery temperature
Parameter Min Typ Max Unit
Normal operation -20 +25 +70 °C
Automatic shutdown
2)3)
Temperature measured on MC55/56 board
Temperature measured at battery NTC
-25
-20
---
---
>+80
+60
°C
°C
Table 26: Ambient temperature according to IEC 60068-2 (without forced air circulation)
Parameter Min Typ Max Unit
Normal operation -20 +25 +55 °C
Restricted operation
4)
-25 to -20 --- +55 to +70 °C
Automatic shutdown
2) 3)
due to MC55/56 board temperature
due to battery temperature
-25
-18
---
---
+70
+60
°C
°C
Table 27: Charging temperature
Parameter Min Typ Max Unit
Battery temperature for software controlled fast
charging (measured at battery NTC)
0 --- +45 °C
See also Chapter 3.3.3.1 for information about the NTCs for on-board and battery
temperature measurement, automatic thermal shutdown and alert messages.
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 MC55/56 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. For details
see Chapter
3.4.
The automatic shutdown threshold T
amb max
= +70°C applies to PCL5 (GSM 900 / GSM 850),
GPRS Class 8 operating mode (1Tx, 4Rx) and a supply voltage not higher than 4.2V. To
2
When an emergency call is in progress automatic thermal shutdown is deferred. See Chapter
3.3.3.2 for detail.
3
Due to temperature measurement uncertainty, a tolerance of ±3°C on these switching thresholds
may occur.
4
Restricted operation according to 3GPP TS 45.005 V6.7.0 (2004-11), Annex D, D.2.1,
Temperature (GSM 400, GSM 900 and DCS 1 800): “Outside this temperature range the MS, if
powered on, shall not make ineffective use of the radio frequency spectrum. In no case shall the
MS exceed the transmitted levels as defined in 3GPP TS 45.005 for extreme operation.”