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M41T11M6F

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List of figures M41T11
4/30 Doc ID 6103 Rev 10
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. 8-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. 28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9. Read mode sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Alternate read mode sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Write mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 12. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 13. Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 14. AC testing input/output waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 15. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 16. SO8 – 8-lead plastic small outline package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 17. SOH28 – 28-lead plastic small outline, battery SNAPHAT
®
package outline. . . . . . . . . . . 24
Figure 18. SH – 4-pin SNAPHAT
®
housing for 48 mAh battery & crystal package outline . . . . . . . . . 25
Figure 19. SH – 4-pin SNAPHAT
®
housing for 120 mAh battery & crystal, package outline. . . . . . . . 26
Figure 20. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
M41T11 Description
Doc ID 6103 Rev 10 5/30
1 Description
The M41T11 is a low-power serial real-time clock (RTC) with 56 bytes of NVRAM. A built-in
32.768 kHz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used
for the clock/calendar function and are configured in binary-coded decimal (BCD) format.
Addresses and data are transferred serially via a two-line bidirectional bus. The built-in
address register is incremented automatically after each write or read data byte.
The M41T11 clock has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply during power failures. The energy needed to
sustain the RAM and clock operations can be supplied from a small lithium coin cell.
Typical data retention time is in excess of 5 years with a 50 mA/h, 3 V lithium cell. The
M41T11 is supplied in an 8-lead plastic small outline package or 28-lead SNAPHAT
®
package.
The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct
connection to a separate SNAPHAT housing containing the battery and crystal. The unique
design allows the SNAPHAT battery package to be mounted on top of the SOIC package
after the completion of the surface mount process. Insertion of the SNAPHAT housing after
reflow prevents potential battery and crystal damage due to the high temperatures required
for device surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion.
The SOIC and battery/crystal packages are shipped separately. For the 28-lead SOIC, the
battery/crystal package (i.e. SNAPHAT) part number is “M4Txx-BR12SH” (see Table 16 on
page 27).
Caution: Do not place the SNAPHAT battery/crystal package “M4Txx-BR12SH” in conductive foam
since this will drain the lithium button-cell battery.
Figure 1. Logic diagram
AI01000
OSCI
V
CC
M41T11
V
SS
SCL
OSCO
SDA
FT/OUT
V
BAT
Description M41T11
6/30 Doc ID 6103 Rev 10
Figure 2. 8-pin SOIC connections
Figure 3. 28-pin SOIC connections
Table 1. Signal names
OSCI Oscillator input
OCSO Oscillator output
FT/OUT Frequency test/output driver (open drain)
SDA Serial data address input/output
SCL Serial clock
V
BAT
Battery supply voltage
V
CC
Supply voltage
V
SS
Ground
1
SDAV
SS
SCL
FT/OUTOSCO
OSCI V
CC
V
BAT
AI01001
M41T11
2
3
4
8
7
6
5
AI03606
8
2
3
4
5
6
7
9
10
11
12
13
14
22
21
20
19
18
17
16
15
28
27
26
25
24
23
1
NC
V
SS
NC
NC
NC V
CC
M41T11
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
SDA
NC
SCL
NC
NC
NC
NC
NC
FT/OUT
NC
NC
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M41T11M6F

Mfr. #:
Buy M41T11M6F
Manufacturer:
STMicroelectronics
Description:
Real Time Clock Serial 512 (64x8)
Lifecycle:
New from this manufacturer.
Delivery:
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