M41T81SM6F STMicroelectronics, M41T81SM6F Datasheet - Page 15

• Manufacturer Part Number: M41T81SM6F
• Description: IC RTC SERIAL W/ALARM 8SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T81SM6F

• Memory Size: 20B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Function: Clock/Calendar/Alarm/Timer Interrupt
• Rtc Memory Size: 20 Byte
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial (I2C)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4684-2

M41T81S
Table 2.
0 = Must be set to '0'
ABE = Alarm in battery backup mode enable bit
AF = Alarm flag (read only)
AFE = Alarm flag enable flag
BL = Battery low bit
BMB0-BMB4 = Watchdog multiplier bits
CB = Century bit
CEB = Century enable bit
FT = Frequency test bit
HT = Halt update bit
OF = Oscillator fail flag
OFIE = Oscillator fail interrupt enable
OUT = Output level
RB0-RB1 = Watchdog resolution bits
RPT1-RPT5 = Alarm repeat mode bits
RS0-RS3 = SQW frequency
S = Sign bit
SQWE = Square wave enable
ST = Stop bit
WDF = Watchdog flag (read only)
Addr
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
11h
12h
13h
RPT4
RPT3
RPT1
RPT2
OFIE
WDF
OUT
CEB
AFE
RS3
D7
ST
0
0
0
0
0
0
0
Clock register map
BMB4 BMB3 BMB2 BMB1 BMB0
RPT5
SQW
RS2
0.1 seconds
CB
D6
FT
HT
AF
0
0
0
Alarm 10 seconds
0
0
0
Alarm 10 minutes
10 years
10 seconds
10 minutes
ABE
RS1
D5
AI 10 date
AI 10 hour
S
0
0
0
0
0
0
10 hours
10 date
Doc ID 10773 Rev 6
10M
RS0
D4
BL
Al
0
0
0
0
D3
0
0
0
0
0
0
Hours (24-hour format)
Calibration
Date: day of month
Alarm seconds
Alarm minutes
0.01 Seconds
Alarm month
Alarm hour
Alarm date
OF
D2
Seconds
0
0
0
0
Minutes
Month
Day of week
Year
RB1
D1
0
0
0
0
0
RB0
D0
0
0
0
0
0
Century/hours
Calibration
Watchdog
Function/range BCD
Reserved
Reserved
Reserved
Seconds
Seconds
Al month
Minutes
Al hour
Al date
Month
Al min
Al sec
SQW
Date
Flags
Year
Day
Clock operation
format
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-12
01-31
00-23
00-59
00-59
01-7
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