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Operating Temperatures; Table 21: Board Temperature; Table 22: Ambient Temperature According To Iec 60068-2 (without Forced Air Circulation); Table 23: Charging Temperature - Siemens AC75 Hardware Interface Description

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AC75 Hardware Interface Description
Strictly confidential / Preliminary
5.2

Operating Temperatures

Table 21: Board temperature

Parameter
Operating temperature range
5
Automatic shutdown
Temperature measured on AC75 board
Temperature measured at battery NTC

Table 22: Ambient temperature according to IEC 60068-2 (without forced air circulation)

Parameter
Operating temperature range
6
Restricted operation

Table 23: Charging temperature

Parameter
Battery temperature for software controlled fast charging
(measured at battery NTC)
Note:
See Chapter 3.3.4 for further information about the NTCs for on-board and battery
temperature measurement, automatic thermal shutdown and alert messages.
When data are transmitted over EGPRS or GPRS the AC75 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 Chapter 3.4 "Automatic EGPRS/GPRS Multislot Class
Change".
5
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 undertemperature limit.
6
Restricted operation allows normal mode speech calls or data transmission for limited time until automatic
thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic thermal
shutdown is deferred until hang up.
AC75_HD_V00.202
Min
-30
-30
-20
Min
-30
Min
0
Page 83 of 120
s
Typ
Max
Unit
+85
°C
---
+90
°C
---
+60
Typ
Max
Unit
+25
+75
°C
---
+75 to
°C
+85
Typ
Max
Unit
---
+45
°C
27.04.2006

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