M41ST87WMX6 STMicroelectronics, M41ST87WMX6 Datasheet - Page 30

• Manufacturer Part Number: M41ST87WMX6
• Description: IC SUPERVISOR RTC 160X8 28-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Supervisorr

Specifications of M41ST87WMX6

• Memory Size: 160B
• 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/Alarm/Timer Interrupt
• Rtc Memory Size: 160 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: Lead free / RoHS Compliant
• Other names: 497-5370-5; M41ST87WMX6

Clock operation
3.1
Table 7.
30/54
16h-1Dh
1Eh-1Fh
20h-9Fh
Addr
0Ah
0Bh
0Ch
0Dh
0Eh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
10h
11h
12h
13h
14h
15h
PFOD
RPT4
RPT3
RPT2
RPT1
TEB1
TEB2
WDS
OFIE
WDF
OUT
CB1
AFE
RS3
TR
D7
ST
TIMEKEEPER
The M41ST87Y/W offers 22 internal registers which contain clock, control, alarm, watchdog,
flag, square wave, and tamper data. The 8 clock registers are memory locations which
contain external (user accessible) and internal copies of the data (usually referred to as
BiPORT
except that they are updated periodically by the simultaneous transfer of the incremented
internal copy. The internal divider (or clock) chain will be reset upon the completion of a
WRITE to any clock address (00h to 07h).
The system-to-user transfer of clock data will be halted whenever the address being
accessed is a clock address (00h to 07h). The updates will resume either due to a stop
condition or when the pointer increments to a non-clock or RAM address.
TIMEKEEPER and alarm registers store data in BCD format. Control, watchdog and square
wave registers store data in binary format.
TIMEKEEPER
0
0
0
0
SQWE
BMB4
RPT5
TIE1
TIE2
CB0
THS
RS2
HT
D6
FT
AF
0
0
0
0
0
™
0.1 seconds
TIMEKEEPER cells). The external copies are independent of internal functions
Alarm 10 seconds
Alarm 10 minutes
10 Years
10 seconds
CLRPW1 CLRPW0
10 minutes
®
BMB3
TCM1
TCM2
ABE
RS1
register map
D5
S
0
0
0
0
0
AI 10 hour
AI 10 date
10 hours
10 date
®
registers
Al 10M
BMB2
TPM1
TPM2
10M
RS0
D4
BL
0
0
0
Reserved
Doc ID 9497 Rev 9
ROM
Data
SQWOD
BMB1
TDS1
TDS2
32kE
D3
0
0
0
0
Hours (24-hour format)
Calibration
Date: day of month
TCLO1
TCLO2
BMB0
Alarm seconds
TCHI/
TCHI/
Alarm minutes
0.01 seconds
Alarm month
OF
D2
Alarm date
Alarm hour
0
0
0
0
Seconds
Minutes
Month
Year
Day of week
CLR1
CLR2
RB1
TB1
D1
0
0
0
0
EXT
EXT
CLR1
CLR2
RB0
TB2
D0
0
0
0
0
M41ST87Y, M41ST87W
Watchdog
Reserved
Reserved
Reserved
10s/100s
Seconds
Al month
Tamper1
Tamper2
128 user
seconds
Century/
Minutes
number
Control
Al hour
Al date
Month
Al min
Hours
Al sec
Function/range
Serial
SQW
bytes
Date
Flags
Year
Day
BCD format
8-byte
2-byte
00-99
00-59
00-59
00-23
01-31
01-12
00-99
01-12
01-31
00-23
00-59
00-59
01-7
0-1/