M41T80M6E STMicroelectronics, M41T80M6E Datasheet - Page 16

• Manufacturer Part Number: M41T80M6E
• Description: IC RTC SERIAL W/ALARM 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T80M6E

• 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)
• Function: Clock/Calendar/Alarm/Timer Interrupt
• Rtc Memory Size: 20 Byte
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 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: 497-2820-5; M41T80M6

Clock operation
3.3
Note:
3.4
16/25
Table 5.
Full-time 32 KHz square wave output
The M41T80 offers the user a special 32 KHz square wave function which defaults to output
on the F
function is available within four seconds of initial power-up and can only be disabled by
setting the 32KE bit to '0' or the ST bit to '1.' If not used, the F
and allowed to float.
The F
Century bit
Bits D7 and D6 of clock register 03h contain the CENTURY ENABLE bit (CEB) and the
CENTURY bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or
from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,'
CB will not toggle.
RS3
32K
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
32K
pin is an open drain which requires an external pull-up resistor.
pin (pin 3) as long as V
Square wave output frequency
RS2
Square wave bits
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Doc ID 9074 Rev 4
CC
RS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
is valid, and the oscillator is running (ST bit = '0'). This
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
32K
Frequency
pin should be disconnected
32.768
8.192
4.096
2.048
1.024
None
512
256
128
64
32
16
8
4
2
1
Square wave
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
M41T80
-