Electrical, Reliability And Radio Characteristics; Absolute Maximum Ratings; Operating Temperatures; Table 15: Absolute Maximum Ratings Under Non-Operating Conditions - Siemens TC65 Hardware Interface Description

TC65 Hardware Interface Description
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5

Electrical, Reliability and Radio Characteristics

5.1

Absolute Maximum Ratings

The absolute maximum ratings stated in Table 15 are stress ratings under non-operating
conditions. Stresses beyond any of these limits will cause permanent damage to TC65.

Table 15: Absolute maximum ratings under non-operating conditions

Parameter
Supply voltage BATT+
Voltage at digital pins
Voltage at analog pins
Voltage at VCHARGE pin
Voltage at CHARGEGATE pin
VUSB_IN
VSENSE
ISENSE
5.2

Operating Temperatures

Test conditions were specified in accordance with IEC 60068-2 (still air). The values stated
below are in compliance with GSM recommendation TS 51.010-01.

Table 16: Operating temperatures

Parameter
Ambient temperature (according to GSM 11.10)
Automatic shutdown
TC65 board temperature
Battery temperature
Ambient temperature for charging (software controlled fast
charging)
Due to temperature measurement uncertainty, a tolerance on these switching off thresholds
may occur. The possible deviation is in a range of:
•
± 3°C at the overtemperature limit
•
± 5°C at the undertemperature limit
*)
On TC65 the automatic overtemperature shutdown threshold is set to 90°C board
temperature. This prevents permanent damage to components on the board. Consider
the ratio of output power, supply voltage and operating temperature: to achieve T
= 65°C in GPRS Class 8 (GSM900/ GSM850) with 2W RF power the supply voltage
must not be higher than 4.2V.
TC65_HD_V00.521
Min
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
Min
-30
-30
-20
0
Page 70 of 99
s
Max Unit
5.5 V
3.05 V
3.0 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
Typ Max Unit
*)
+25 +65 °C
*)
--- +90 °C
--- +60
--- +45 °C
amb max
24.05.2005