Specifications

XT65/XT75 Hardware Interface Description
7.2 Operating Temperatures
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XT65_XT75_HD_v01.001 Page 90 of 133 2007-1-8
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7.2 Operating Temperatures
The values listed in Table 23 to Table 25 are applicable at maximum power control level.
Note:
•See Section 3.3.4 for further information about the NTCs for on-board and battery temperature measurement,
automatic thermal shutdown and alert messages.
• When data is transmitted over EGPRS or GPRS the XT65/XT75 automatically reverts to a lower Multislot
Class if the temperature increases 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 Section 3.4.
Table 23: Board temperature
Parameter Min Typ Max Unit
Automatic shutdown
1
Temperature measured on XT65/XT75 board
Temperature measured at battery NTC
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
-20
---
---
>+80
+60
°C
Table 24: Ambient temperature according to IEC 60068-2 (without forced air circulation)
Parameter Min Typ Max Unit
Operating temperature range -30 +25 +65 °C
Restricted operation (with V
BATT+
< 3,8V) +70 °C
Restricted operation
1
1.
Restricted operation allows normal mode speech calls or data transmission for limited time until automatic
thermal shutdown takes effect. For operating the XT75/65 above an expected ambient temperatures of
70°C please contact Siemens Application Engineering. The duration of emergency calls is unlimited be-
cause automatic thermal shutdown is deferred until hang up.
--- +70 to
+85
°C
Table 25: Ambient temperature with forced air circulation (air speed 0.9m/s)
Parameter Min Typ Max Unit
Operating temperature range -30 +25 +70 °C
Restricted operation (with V
BATT+
< 3,8V) +75 °C
Restricted operation
1
1.
Restricted operation allows normal mode speech calls or data transmission for limited time until automatic
thermal shutdown takes effect. For operating the XT75/65 above an expected ambient temperatures of
75°C please contact Siemens Application Engineering. The duration of emergency calls is unlimited be-
cause automatic thermal shutdown is deferred until hang up.
--- +75 to
+85
°C
Table 26: Charging temperature
Parameter Min Typ Max Unit
Battery temperature for software controlled fast charging
(measured at battery NTC)
0 --- +45 °C