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M4T28-BR12SH Datasheet(PDF) 2 Page - STMicroelectronics |
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M4T28-BR12SH Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 7 page M4TXX-BR12SH 2/7 MECHANICAL INFORMATION Electrical connection to the SOIC is made through four pins that connect to the four press fitted sock- ets at each end of the SOIC. Critical contact points between the pins and sockets are gold-plat- ed to resist oxidation. Internally, each socket con- tains six independent contact fingers to form redundant connections between the two compo- nents. These sockets were designed with high point contact force to provide the lowest possible contact resistance. The SNAPHAT top also incor- porates four molded-in retaining clips which hold onto the ends of the SOIC insuring mechanical and electrical connection even under severe me- chanical shock and vibration. The combined SOIC and SNAPHAT assembly can sustain shock levels in excess of 100 g without separating. This pack- age also passes variable frequency testing in ac- cordance with MIL-STD-883, method 2007.2, condition A. Figure 2 illustrates the affect of repeated insertion and extraction of the SNAPHAT top to the SOIC. 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 will only need to be extracted and re-inserted once in its lifetime. BATTERY CHARACTERISTICS Figure 3 illustrates the lithium coin cell discharge rate for a given load. This demonstrates the char- Figure 2. SNAPHAT Insertion/Extraction Forces AI02526 0 2.5 5 12 3 6 Number of Extractions 45 7 7.5 10 12.5 5 7.5 20 9 8 10 Average Insertion Force Average Extraction Force Table 1. Description Parameter Value Operating Temperature 1 = 0 to 70 °C 6 = –40 to 85 °C Storage Temperature –40 to 85 °C Nominal Crystal Frequency 32.768 kHz Load Capacitance 12.5 pF Nominal Battery Voltage 2.8 V Nominal Battery Capacity 48 mAh M4T28 120 mAh M4T32 Battery Chemistry Li(CF)x acteristically flat voltage level supplied by the bat- tery 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 M4Txx-BR12SH has been recognized by Un- derwriters Laboratories under their Component Recognition Program and carries U.L. File Num- ber E89556. |
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