BQ48SH-28X6 Datasheet, PDF (4/6 Pages) Texas Instruments – SNAPHAT WITH INTEGRATED BATTERY AND CRYSTAL

bq48SH-28x6
SLUS508A – DECEMBER 2001 REVISED – JUNE 2002
functional description (continued)
battery characteristics
Figure 2 illustrates the lithium coin cell discharge rate for a given load. This demonstrates the characteristically
flat voltage level supplied by the battery until very near the end of its life. These discharge levels have been
greatly accelerated in comparison to the normal, actual usage.
UL recognition
The bq48SH–28x6 has been recognized by Underwriters Laboratories under their Component Recognition
Program and carries UL File No. E89556.
battery life
The life expectancy of the battery is greatly affected by temperature and usage profiles. Figure 2 highlights the
effective discharge during loading periods, but temperature during loading periods can greatly affect the
effective run time as shown in Figure 3.
general notes
To remove the SNAPHAT^ top for replacement, a DIP/IC extractor tool should be used. The SNAPHAP top
should be grasped by the narrow end to avoid bending the pins.
CAUTION:
To avoid draining the battery, do NOT place SNAPHAT pins into conductive foam.
TYPICAL CHARACTERISTICS
BR1225 LITHIUM COIN CELL DISCHARGE RATE
vs
CELL VOLTAGE
3.5
TA = 20_C
3.0
2.5
2.0
1.5
1.0
0
RL = 30 kΩ
RL = 15 kΩ
RL = 100 kΩ
400
800
1200
1600
tD – Discharge Duration – h
Figure 2
2000
4
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