M41T81M6F STMicroelectronics, M41T81M6F Datasheet - Page 18
![IC RTC SERIAL W/ALARM 8-SOIC](/photos/1/38/13851/497-8-soic_sml.jpg)
M41T81M6F
Manufacturer Part Number
M41T81M6F
Description
IC RTC SERIAL W/ALARM 8-SOIC
Manufacturer
STMicroelectronics
Type
Clock/Calendar/Alarmr
Datasheet
1.M41T81M6F.pdf
(29 pages)
Specifications of M41T81M6F
Memory Size
20B
Time Format
HH:MM:SS:hh (24 hr)
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4709-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M41T81M6F
Manufacturer:
STM
Quantity:
1 364
Part Number:
M41T81M6F
Manufacturer:
ST
Quantity:
20 000
Part Number:
M41T81M6F11
Manufacturer:
ST
Quantity:
20 000
Clock operation
3.6
3.7
18/29
Square wave output
The M41T81 offers the user a programmable square wave function which is output on the
SQW pin. RS3-RS0 bits located in 13h establish the square wave output frequency. These
frequencies are listed in
completed, the IRQ/FT/OUT/SQW pin can be turned on and off under software control with
the square wave enable bit (SQWE) located in register 0Ah.
Table 4.
Century bit
Bits D7 and D6 of clock register 03h contain the CENTURY ENABLE bit (CEB) and the
CENTURY bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or
from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,'
CB will not toggle.
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Square wave output frequency
RS2
Square wave bits
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table
Doc ID 7529 Rev 10
4. Once the selection of the SQW frequency has been
RS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Frequency
32.768
8.192
4.096
2.048
1.024
None
512
256
128
64
32
16
8
4
2
1
Square wave
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
M41T81
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