MC75i Hardware Interface Description
5.2 Operating Temperatures
101
MC75i_HD_v01.100a
Page 80 of 122
2009-08-13
Confidential / Released
5.2
Operating Temperatures
Note
:
•
See
for further information about the NTCs for on-board and battery temper-
ature measurement, automatic thermal shutdown and alert messages.
•
When data are transmitted over EGPRS or GPRS the MC75i 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
Table 24:
Board / battery temperature
Parameter
Min
Typ
Max
Unit
Normal operation
-30
+25
+70
°C
Restricted operation
1
1. Restricted operation allows normal mode speech calls or data transmission for limited time until auto-
matic thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic
thermal shutdown is deferred until hang up.
----
---
+70 to +75
°C
Automatic shutdown
2
Temperature measured on MC75i board
Temperature measured at battery NTC
2. Due to temperature measurement uncertainty, a tolerance on the stated shutdown thresholds may oc-
cur. The possible deviation is in the range of ±3°C at the overtemperature limit and ±5°C at the under-
temperature limit.
-40
-20
---
---
>+80
+60
°C
Table 25:
Ambient temperature according to IEC 60068-2 (without forced air circulation)
Parameter
Min
Typ
Max
Unit
Normal operation
-30
+25
+65
°C
Restricted operation
1
1. Restricted operation allows normal mode speech calls or data transmission for limited time until auto-
matic thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic
thermal shutdown is deferred until hang up.
-30 to -40
---
+65 to +75
°C
Table 26:
Charging temperature
Parameter
Min
Typ
Max
Unit
Battery temperature for software controlled fast
charging (measured at battery NTC)
0
---
+45
°C
