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M4T32-BR12SH6

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
DocID013125 Rev 4 7/16
M4T28-BR12SH, M4T32-BR12SH DC and AC parameters
16
3 DC and AC parameters
This section summarizes the operating and measurement conditions, as well as the DC and
AC characteristics of the device. The parameters in the following DC and AC characteristic
tables are derived from tests performed under the measurement conditions listed in the
relevant tables. Designers should check that the operating conditions in their projects match
the measurement conditions when using the quoted parameters.
Table 3. Operating and AC measurement conditions
Parameter M4T28-BR12SH M4T32-BR12SH Unit
Nominal battery voltage (V
CC
) 2.8 2.8 V
Nominal battery capacity 48 120 mAh
Battery chemistry Li(CF) Li(CF)
Crystal load capacitance (C
L
) 12.5 12.5 pF
Nominal crystal frequency 32.768 32.768 kHz
Crystal accuracy (at 25°C) ± 35 ± 35 ppm
Mechanical information M4T28-BR12SH, M4T32-BR12SH
8/16 DocID013125 Rev 4
4 Mechanical information
Electrical connection to the SOIC is made through four pins that connect to the four press
fitted sockets at each end of the SOIC. Critical contact points between the pins and sockets
are gold-plated to resist oxidation. Internally, each socket contains six independent contact
fingers to form redundant connections between the two components. These sockets were
designed with high point contact force to provide the lowest possible contact resistance. The
SNAPHAT
®
top also incorporates four molded-in retaining clips which hold onto the ends of
the SOIC ensuring mechanical and electrical connection even under severe mechanical
shock and vibration. The combined SOIC 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 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 four or five extractions, 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.
Figure 2. SNAPHAT
®
insertion/extraction forces
0
2.5
5
7.5
10
12.5
15
12345678910
Number of Extractions
Force (pounds)
Average Insertion
Average Extraction
AI02526
DocID013125 Rev 4 9/16
M4T28-BR12SH, M4T32-BR12SH Mechanical information
16
4.1 Battery characteristics
Figure 3 on page 10 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.
Note: These batteries contain no mercury (Hg), cadmium (Cd), or lead (Pb).
4.2 UL recognition
The M4Txx-BR12SH has been recognized by Underwriters Laboratories under their
Component Recognition Program and carries U.L. File Number E89556.
4.3 Battery life
For information on data retention life and battery storage life, please refer to the application
note AN1012.
4.4 General notes
ST has conducted experiments using a manual press which determined that if
approximately 60 pounds of force is applied to the top of the SNAPHAT
®
, battery damage
and/or die cracks could be induced. As Figure 2 on page 8 specifies, only an average of
less than 13 force-pounds is required for proper insertion. We recommend that no more
than 40 pounds of force be applied during SNAPHAT insertion.
If a manual press in employed, it is very important that it be calibrated such that it cannot
exceed this limit.
To remove the SNAPHAT top for replacement, a DIP/IC extractor tool should be used (see
Figure 4). The SNAPHAP top should be grabbed by the narrow end to avoid bending the
pins.
Caution: To avoid draining battery do NOT place SNAPHAT pins into conductive foam.
Caution: To avoid damaging SNAPHAT sockets do NOT wave solder SOIC.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

M4T32-BR12SH6

Mfr. #:
Buy M4T32-BR12SH6
Manufacturer:
STMicroelectronics
Description:
Battery Management Snaphat Batt & Cryst
Lifecycle:
New from this manufacturer.
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