bq48SH-28x6

SLUS508A – DECEMBER 2001 REVISED – JUNE 2002

3

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functional description

connections

The SOIC (DSH) is connected to the SNAPHAT

 containing the battery and crystal through four pins that insert

into four press-fitted sockets in the SOIC (DSH) where the contact area is gold platted. Each of the sockets

internally contains six independent contacts to ensure solid reliable connectivity and minimize contact

resistance.

Four molded retaining clips on the SNAPHAT

 also help fasten the SOIC (DSH), ensuring mechanical and

electrical connection even under severe mechanical shock and vibration. The combined SOIC (DSH) and

SNAPHAT assembly can sustain shock levels in excess of 100 g without separating. This package also passes

variable frequency testing in accordance with MIL–STD–883, method 2007.2, condition A.

Figure 1 illustrates the effect of repeated insertion and extraction of the SNAPHAT

 top to the SOIC (DSH). The

force required to extract the SNAPHAT

, and then to re-insert it, reduces each time. After three or four

extractions, though, the reduction starts to become unnoticeable, and the force required remains at a fairly

constant figure. Typically, though, the SNAPHAT needs to be extracted and re-inserted only once in its lifetime.

Figure 1. SNAPHAT Insertion and Extraction Forces