User's Manual

HC25 Hardware Interface Overview
5.2 Operating Temperatures
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HC25_HO_v00.220 Page 24 of 39 2007-03-20
Confidential / Preliminary
5.2 Operating Temperatures
The values stated below are in compliance with GSM recommendation TS 51.010-01.
Table 11 shows the temperatures for automatic shutdown as measured by the on-board mea-
suring element NTC. The maximum allowable ambient temperature that causes the module to
shut down depends on various conditions. The following tables Table 12 and Table 13 show
sample lab environment conditions. Please be aware that the operating duration and the max-
imum ambient temperature will vary significantly for your application.
Note: Generally it is strongly recommended to implement additional measures to lead the heat
out of the application, especially at maximum transmission power levels of WCDMA (24dBm),
e.g. use of ground area for a heat sink or convection (see Section 6.1 for the ground area that
may be used for a heat sink).
Table 11: Board temperature
Parameter Min Typ Max Unit
Operating temperature range -20 +25 +85 °C
Automatic shutdown
1
Temperature measured on HC25 board
1.
Due to temperature measurement uncertainty, a tolerance on the stated shutdown thresholds may occur.
The possible deviation is in the range of ± 3°C at the overtemperature limit and ± 5°C at the undertem-
perature limit.
< -30 --- >+85 °C
Table 12: Sample operating conditions without forced air circulation (according to IEC 60068-2)
Mode Ambient
Temperature
Voltage RF Power Operating
Duration
GSM,
GPRS/EDGE Class 8
+65°C V
BATT+
< 3.8V Max. ∞
WCDMA +55°C V
BATT+
< 3.4V < 10dBm ∞
WCDMA +65°C V
BATT+
< 3.4V < 0dBm ∞
GRPS/EDGE Class10 +65°C V
BATT+
< 3.8V Max. < 2min
WCDMA +65°C V
BATT+
< 3.8V Max. < 2min
Table 13: Sample operating conditions with forced air circulation (air speed 0.9m/s)
Mode Ambient
Temperature
Voltage RF Power Operating
Duration
GSM,
GPRS/EDGE Class 8
+75°C V
BATT+
< 3.8V Max. ∞
WCDMA +60°C V
BATT+
< 3.4V < 10dBm ∞
WCDMA +70°C V
BATT+
< 3.4V < 0dBm ∞
GRPS/EDGE Class 10 +65°C V
BATT+
< 3.8V Max. ∞
WCDMA +60°C V
BATT+
< 3.4V Max. ∞