M41T81M6F STMicroelectronics, M41T81M6F Datasheet - Page 19

• Manufacturer Part Number: M41T81M6F
• Description: IC RTC SERIAL W/ALARM 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T81M6F

• 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: Lead free / RoHS Compliant
• Other names: 497-4709-2

M41T81
3.8
Note:
3.9
Output driver pin
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
control 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.
Preferred initial power-on default
Upon initial application of power to the device, the following register bits are set to a '0' state:
watchdog register; AFE; ABE; SQWE; and FT. The following bits are set to a '1' state: ST;
OUT; and HT (see
Table 5.
1. BMB0-BMB4, RB0, RB1.
2. State of other control bits undefined.
3. UC = unchanged
Initial power-up
Subsequent power-up (with
battery backup)
Condition
Preferred default values
(2)
(3)
Table
5).
UC
ST
1
Doc ID 7529 Rev 10
HT
1
1
OUT
UC
1
FT
0
0
AFE
UC
0
SQWE
UC
0
ABE
UC
0
Clock operation
Watchdog
register
0
0
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