M41ST85WMH6E STMicroelectronics, M41ST85WMH6E Datasheet - Page 20

• Manufacturer Part Number: M41ST85WMH6E
• Description: IC RTC 3.0V 512BIT NVRAM 28SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Supervisorr

Specifications of M41ST85WMH6E

• Memory Size: 64B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC, 28-SOH (8.48mm Width)
• Function: Clock/Calendar/Supervisor/Alarm
• Rtc Memory Size: 64 Byte
• Supply Voltage (max): 3.6 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 (2-Wire, I2C)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2804-5; M41ST85WMH6

Clock operation
Table 2.
20/41
Keys:
Address
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 zero
BL = Battery low flag (read only)
BMB0-BMB4 = Watchdog multiplier bits
CEB = Century enable bit
CB = Century bit
OUT = Output level
AFE = Alarm flag enable flag
RPT4
RPT3
RPT2
RPT1
WDS
WDF
TIMEKEEPER
CEB
OUT
AFE
RS3
TR
D7
ST
0
0
0
0
0
0
SQWE
BMB4
RPT5
RS2
0.1 seconds
CB
D6
HT
AF
FT
0
0
0
0
0
0
Alarm 10 seconds
10 years
Alarm 10 minutes
10 seconds
10 minutes
®
BMB3
ABE
RS1
register map
D5
S
AI 10 date
AI 10 hour
0
0
0
0
0
0
10 hours
10 date
Al 10M
BMB2
10M
RS0
D4
BL
0
0
0
0
Data
BMB1
D3
0
0
0
0
0
0
Hours (24-hour format)
Calibration
Date: day of month
RPT1-RPT5 = Alarm repeat mode bits
RB0-RB1 = Watchdog resolution bits
WDS = Watchdog steering bit
ABE = Alarm in battery backup mode enable bit
WDF = Watchdog flag (read only)
AF = Alarm flag (read only)
SQWE = Square wave enable
RS0-RS3 = SQW frequency
HT = Halt update bit
TR = t
BMB0
Alarm seconds
Alarm minutes
0.01 seconds
Alarm month
D2
Alarm hour
Alarm date
0
0
0
0
0
Seconds
Minutes
Month
rec
Year
Day of week
bit
RB1
D1
0
0
0
0
0
RB0
D0
0
0
0
0
0
Century/hours
Watchdog
Reserved
Reserved
Reserved
Seconds
Seconds
Al month
Minutes
Control
Al hour
Al date
Month
Al min
Al sec
SQW
Date
Flags
Year
Day
Function/range
BCD format
M41ST85W
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-12
01-31
00-59
00-59
00-23
01-7