M41T80M6E STMicroelectronics, M41T80M6E Datasheet - Page 5

• 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

M41T80
1
Description
The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal
controlled). Eight registers (see
clock/calendar function and are configured in binary coded decimal (BCD) format. An
additional 12 registers provide status/control of alarm, 32 KHz output, and square wave
functions. Addresses and data are transferred serially via a two line, bi-directional I
interface. The built-in address register is incremented automatically after each WRITE or
READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts,
32 KHz output, and programmable square wave output. The eight clock address locations
contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of
a second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100),
30 and 31 day months are made automatically.
The M41T80 is supplied in an 8-pin SOIC.
Figure 1.
Table 1.
IRQ/OUT/SQW
Logic diagram
Signal names
SDA
F
SCL
V
V
XO
XI
32K
CC
SS
SDA
SCL
Doc ID 9074 Rev 4
XO
Table 3: Clock register map on page
XI
Oscillator input
Oscillator output
Interrupt / output driver / square wave (open drain)
Serial data input/output
Serial clock input
32 KHz square wave output (open drain)
Supply voltage
Ground
M41T80
V CC
V SS
F 32K
IRQ/OUT/SQW
14) are used for the
Description
2
C
AI07005
5/25