User's Manual

TC65 Hardware Interface Description
Strictly confidential / Draft
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TC65_HD_V00.450 Page 68 of 96 20.04.2005
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 Min Max Unit
Supply voltage BATT+ -0.3 5.5 V
Voltage at digital pins -0.3 3.05 V
Voltage at analog pins -0.3 3.0 V
Voltage at VCHARGE pin -0.3 5.5 V
Voltage at CHARGEGATE pin -0.3 5.5 V
VUSB_IN -0.3 5.5
V
VSENSE 5.5
V
ISENSE 5.5
V
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 Min Typ Max Unit
Ambient temperature (according to GSM 11.10) -30 +25 +65
*)
°C
Automatic shutdown
TC65 board temperature
Battery temperature
-30
-20
---
---
+90
*)
+60
°C
Ambient temperature for charging (software controlled fast
charging)
0 --- +45 °C
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
amb max
= 65°C in GPRS Class 8 (GSM900/ GSM850) with 2W RF power the supply voltage
must not be higher than 4.2V.