M41T81SM6E STMicroelectronics, M41T81SM6E Datasheet - Page 22

• Manufacturer Part Number: M41T81SM6E
• Description: IC RTC SER ACCESS W/ALARM 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T81SM6E

• 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)
• Clock Format: HH
• Clock Ic Type: RTC
• Interface Type: I2C, Serial
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6708-5; M41T81SM6E

Clock operation
Output driver pin
Note:
Preferred initial power-on default
1. BMB0-BMB4, RB0, RB1
2. State of other control bits undefined
3. UC = Unchanged
22/32
Initial power-up
Subsequent power-up
(with battery backup)
Condition
When the FT bit, AFE bit, SQWE bit, and watchdog register are not set, the
IRQ/FT/OUT/SQW pin becomes an output driver that reflects the contents of D7 of the
calibration register. In other words, when D7 (OUT bit) and D6 (FT bit) of address location
08h are a '0,' then the IRQ/FT/OUT/SQW pin will be driven low.
The IRQ/FT/OUT/SQW pin is an open drain which requires an external pull-up resistor.
Upon initial application of power to the device, the following register bits are set to a '0' state:
watchdog register; AFE; ABE; SQWE; OFIE; and FT. The following bits are set to a '1' state:
ST; OUT; OF; and HT (see
Table 5.
(2)
(3)
Preferred default values
UC
ST
1
HT
Table
1
1
Doc ID 10773 Rev 6
Out
UC
5).
1
FT
0
0
AFE SQWE ABE
UC
0
UC
0
UC
0
WATCHDOG
register
0
0
(1)
UC
OF
1
M41T81S
OFIE
UC
0