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M4T32-BR12SH Arkusz danych(PDF) 2 Page - STMicroelectronics

Numer części M4T32-BR12SH
Szczegółowy opis  TIMEKEEPER SNAPHAT Battery & Crystal
Download  7 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M4T32-BR12SH Arkusz danych(HTML) 2 Page - STMicroelectronics

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M4TXX-BR12SH
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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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