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M4T(28,32)-BR12SH

STMicroelectronics

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Datasheet

This is information on a product in full production.
February 2014 DocID013125 Rev 4 1/16
M4T28-BR12SH
M4T32-BR12SH
Real-time clock and TIMEKEEPER® SNAPHAT®
battery with crystal
Datasheet - production data
Features
Provides battery backup power for serial real-
time clock, non-volatile TIMEKEEPER® and
supervisor devices in the 28- or 44-pin
SNAPHAT® SOIC package
Removable battery avoids heat associated with
surface-mount process
Snaps directly onto surface-mounted
SNAPHAT SOIC
Choice of battery capacities
M4T28-BR12SH = 48 mAh
M4T32-BR12SH = 120 mAh
Keyed insertion to ensure proper assembly
Removable for replacement and proper
disposal
Pb-free package
Available in Ecopack® packages, tubes
Description
The M4Txx-BR12SH SNAPHAT® top is a
detachable lithium power source for ST’s serial
real-time clock and non-volatile TIMEKEEPER®
surface-mount SOIC package (28- and 44-pin).
The SNAPHAT top contains both the battery and
crystal and is designed to be “snapped on” after
the SOIC is surface mounted on the PC board.
Thus the two-piece solution prevents the battery
and crystal from being exposed to the high
temperatures of the surface-mount process.
SNAPHAT® battery with crystal
www.st.com
Contents M4T28-BR12SH, M4T32-BR12SH
2/16 DocID013125 Rev 4
Contents
1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 Battery characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 UL recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Battery life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DocID013125 Rev 4 3/16
M4T28-BR12SH, M4T32-BR12SH List of tables
16
List of tables
Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Operating and AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package mechanical data . 11
Table 5. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal,
package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Table 7. Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
List of figures M4T28-BR12SH, M4T32-BR12SH
4/16 DocID013125 Rev 4
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. SNAPHAT® insertion/extraction forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Battery discharge rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. DIP extractor tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package outline. . . . . . . . . 11
Figure 6. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline. . . . . . . . 12
Figure 7. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DocID013125 Rev 4 5/16
M4T28-BR12SH, M4T32-BR12SH Device overview
16
1 Device overview
Figure 1. Logic diagram
Table 1. Signal names
X1 Crystal input
X2 Crystal output
VBAT– Negative voltage
VBAT+ Positive voltage
AI02528
SNAPHAT
VBAT– VBAT+
X1 X2
Maximum ratings M4T28-BR12SH, M4T32-BR12SH
6/16 DocID013125 Rev 4
2 Maximum ratings
Stressing the device above the rating listed in the absolute maximum ratings table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 2. Absolute maximum ratings
Caution: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
Symbol Parameter Value Unit
TAAmbient operating temperature Grade 1 0 to 70 °C
Grade 6(1)
1. Only the M4T32-BR12SH is available in industrial temperature (grade 6).
–40 to 85 °C
TSTG Storage temperature (VCC off, oscillator off) –40 to 85 °C
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 (VCC) 2.8 2.8 V
Nominal battery capacity 48 120 mAh
Battery chemistry Li(CF) Li(CF)
Crystal load capacitance (CL) 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.
Mechanical information M4T28-BR12SH, M4T32-BR12SH
10/16 DocID013125 Rev 4
Figure 3. Battery discharge rates
Figure 4. DIP extractor tool
AI02519
0
1.0
1.5
2.0
2.5
3.0
3.5
Voltage (V)
LOAD CHARACTERISTICS Temp: 20˚C
1000 2000 3000 4000 5000 6000
Duration (hrs.)
(B)
15kΩ30kΩ50kΩ100kΩ
0
1.0
1.5
2.0
2.5
3.0
3.5
Voltage (V)
LOAD CHARACTERISTICS Temp: 20˚C
200 400 600 1200 1600 1800
Duration (hrs.)
(A)
100kΩ
800 1000 1400 2000
15kΩ30kΩ
BR1225
BR1632
AI02527
DocID013125 Rev 4 11/16
M4T28-BR12SH, M4T32-BR12SH Package mechanical data
16
5 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 5. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package outline
Note: Drawing is not to scale.
Table 4. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package mechanical data
Symbol
mm inches
Typ Min Max Typ Min Max
A 9.779 0.385
A1 7.239 7.747 0.285 0.305
A2 6.477 6.985 0.255 0.275
A3 0.000 0.381 0.000 0.015
B 0.457 0.559 0.018 0.022
D 21.082 21.844 0.830 0.860
E 14.224 14.986 0.560 0.590
eA 15.545 15.951 0.612 0.628
eB 3.200 3.607 0.126 0.142
L 2.032 2.286 0.080 0.090
T 6°8° 6°8°
1011860_J
Package mechanical data M4T28-BR12SH, M4T32-BR12SH
12/16 DocID013125 Rev 4
Figure 6. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline
Note: Drawing is not to scale.
Table 5. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package mechanical data
Symb
mm inches
Typ Min Max Typ Min Max
A 10.541 N/A 0.415
A1 8.001 8.509 0.315 0.335
A2 7.239 7.747 0.285 0.305
A3 0.000 0.381 0.000 0.015
B 0.457 0.559 0.018 0.022
D 21.082 21.844 0.830 0.860
E 17.272 18.034 0.680 0.710
eA 15.545 15.951 0.612 0.628
eB 3.200 3.607 0.126 0.142
L 2.032 2.286 0.080 0.090
T6°8°6°8°
7027195_H
DocID013125 Rev 4 13/16
M4T28-BR12SH, M4T32-BR12SH Part numbering
16
6 Part numbering
Table 6. Ordering information scheme
For a list of available options (e.g., speed, package) or for further information on any aspect
of this device, please contact the ST sales office nearest to you.
Example: M4T 28-BR12 SH 1
Device type
M4T
Battery voltage and capacity
28-BR12 = BR1225, 3 V, 48 mAh
32-BR12 = BR1632, 3 V, 120 mAh
Package
SH = SNAPHAT®
Temperature range
1 = 0 to 70°C
6 = –40 to 85°C (M4T32-BR12SH only)
Shipping method
blank = Ecopack® package, tubes
Environmental information M4T28-BR12SH, M4T32-BR12SH
14/16 DocID013125 Rev 4
7 Environmental information
Figure 7. Recycling symbols
This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry)
button cell battery fully encapsulated in the final product.
Recycle or dispose of batteries in accordance with the battery manufacturer's instructions
and local/national disposal and recycling regulations.
DocID013125 Rev 4 15/16
M4T28-BR12SH, M4T32-BR12SH Revision history
16
8 Revision history
Table 7. Document revision history
Date Revision Changes
Nov-1999 1 First issue
01-Mar-2001 2 Reformatted
04-Jun-2001 2.1 Basic textual changes from reformatting activity
10-Jul-2001 2.2 Changes references to “supervisor” from “controller;” clarify temperature
characteristics
21-Jan-2002 2.3 Change to include crystal accuracy (Table 3); add text for SNAPHAT®
insertion force tolerance and battery characteristics note
20-Aug-2002 2.4 Updated insertion/extraction data (Figure 2)
14-Mar-2003 2.5 Add pb-free note on page 1
20-Nov-2008 3 Reformatted document; updated cover page, Section 5: Package
mechanical data, Table 6; added Section 7: Environmental information.
20-Feb-2014 4
Updated title, package representation on page 1, Features, Description,
Section 5: Package mechanical data and Section 7: Environmental
information
Removed tape and reel shipping option from Features and Table 6:
Ordering information scheme
M4T28-BR12SH, M4T32-BR12SH
16/16 DocID013125 Rev 4
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