TC65 Hardware Interface Description
Strictly confidential / Draft
s
TC65_HD_V00.521
Page 70 of 99
24.05.2005
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.
