M41T256YMT7 STMicroelectronics, M41T256YMT7 Datasheet - Page 18

• Manufacturer Part Number: M41T256YMT7
• Description: Real Time Clock Serial 256K (32Kx8)
• Manufacturer: STMicroelectronics

Specifications of M41T256YMT7

• Function: Clock, Calendar
• Rtc Memory Size: 32768 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 25 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-44
• Time Format: HH:MM:SS:hh
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note:
3.4
18/30
Table 3.
Keys:
7FF0h through 7FF6h are invalid addresses and when read will return arbitrary data.
Power-on reset
The M41T256Y continuously monitors V
point, the RST pulls low (open drain) and remains low on power-up for t
passes V
should be chosen to control rise time.
Address
7FFDh
7FFCh
7FFFh
7FFEh
7FFBh
7FFAh
7FF9h
7FF8h
7FF7h
7FF6h
7FF5h
7FF4h
7FF3h
7FF2h
7FF1h
7FF0h
S = Sign bit
FT = Frequency test bit
ST = Stop bit
WC = Write clock bit
X = '1' or '0'
BL = Battery low flag (read only bit)
TB = Tamper bit (read only bit)
TEB = Tamper enable bit
0 = Must be set to '0'
SLP = Sleep mode bit
PFD
WC
TIMEKEEPER
D7
BL
ST
X
X
X
X
X
X
X
(max). The RST pin is an open drain output and an appropriate pull-up resistor
0
0
0
0
0.1 Seconds
SLP
D6
FT
X
X
X
X
X
X
X
0
0
0
10 years
10 seconds
10 minutes
TEB
D5
0
S
X
X
X
X
X
X
X
10 hours
®
10 date
register map
10M
D4
TB
X
X
X
X
X
X
X
Data
CC
D3
X
X
X
X
X
X
X
0
Hours (24 Hour Format)
. When V
Date: Day of Month
Calibration
0.01 Seconds
D2
X
X
X
X
X
X
X
Seconds
Minutes
Month
Day of Week
Year
CC
D1
X
X
X
X
X
X
X
falls to the power fail detect trip
D0
X
X
X
X
X
X
X
Tamper/day
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Seconds
Seconds
Minutes
Control
Month
Hours
Date
Year
Function/Range
REC
BCD Format
after V
0-1/01-07
CC
01-31
00-59
00-59
00-99
00-99
01-12
00-23