M41T81MX6 STMicroelectronics, M41T81MX6 Datasheet - Page 13

• Manufacturer Part Number: M41T81MX6
• Description: IC RTC SERIAL W/ALARM 28-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T81MX6

• 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: Contains lead / RoHS non-compliant
• Other names: 497-2822-5

M41T81
Table 2.
1. Keys:
Addr
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
11h
12h
13h
S = Sign bit
FT = Frequency test bit
ST = Stop bit
0 = Must be set to '0'
BMB0-BMB4 = Watchdog multiplier bits
CEB = Century enable bit
CB = Century bit
OUT = Output level
ABE = Alarm in battery backup mode enable bit
AFE = Alarm flag enable flag
RB0-RB1 = Watchdog resolution bits
RPT1-RPT5 = Alarm repeat mode bits
WDF = Watchdog flag (read only)
AF = Alarm flag (read only)
SQWE = Square wave enable
RS0-RS3 = SQW frequency
HT = Halt update bit
RPT4
RPT3
RPT2
RPT1
WDF
CEB
OUT
AFE
RS3
D7
ST
0
0
0
0
0
0
0
0
Clock register map
SQWE
BMB4
RPT5
RS2
CB
HT
D6
FT
AF
0
0
0
0
0
0
0.1 seconds
10 years
Alarm 10 seconds
Alarm 10 minutes
10 seconds
10 minutes
BMB3
ABE
RS1
D5
S
0
0
0
0
0
0
AI 10 date
AI 10 hour
10 hours
10 date
(1)
Al 10M
BMB2
10M
RS0
D4
0
0
0
0
0
Doc ID 7529 Rev 10
BMB1
D3
0
0
0
0
0
0
Hours (24 hour format)
Calibration
Date: day of month
BMB0
Alarm seconds
Alarm minutes
0.01 seconds
D2
Alarm month
0
0
0
0
0
Alarm date
Alarm hour
Seconds
Minutes
Month
Year
Day of week
RB1
D1
0
0
0
0
0
RB0
D0
0
0
0
0
0
Watchdog
Reserved
Reserved
Reserved
Function/range BCD
Al month
Seconds
Seconds
Century/
Minutes
Control
Al date
Al hour
Month
Al min
Al sec
hours
SQW
Flags
Date
Year
Day
Clock operation
format
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-31
00-23
00-59
00-59
01-12
01-7
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