M41T80M6F Datasheet M41T80M6F, M41T80M6E | P4-P6

List of figures M41T80

4/27 Doc ID 9074 Rev 5

List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. 8-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 7. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 8. READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9. Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 10. WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 11. Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 12. AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 13. SO8 – 8-lead plastic small outline, 150 mils body width, package mechanical drawing. . . 22

Figure 14. Carrier tape for SO8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 15. Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

M41T80 Description

Doc ID 9074 Rev 5 5/27

1 Description

The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal

controlled). Eight registers (see Table 3: Clock register map on page 14) are used for the

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. Logic diagram

Table 1. Signal names

XI Oscillator input

XO Oscillator output

IRQ/OUT/SQW Interrupt / output driver / square wave (open drain)

SDA Serial data input/output

SCL Serial clock input

32K

32 KHz square wave output (open drain)

Supply voltage

Ground

SCL

M41T80

SDA

32K

IRQ/OUT/SQW

AI07005

Description M41T80

6/27 Doc ID 9074 Rev 5

Figure 2. 8-pin SOIC connections

1. Open drain output

Figure 3. Block diagram

1. Open drain output

IRQ/OUT/SQW

(1)

SDA

SCL

32K

(1)

M41T80

AI07006

REAL TIME CLOCK

CALENDAR

RTC W/ALARM

SQUARE WAVE

IRQ/OUT/SQW

(1)

32K

(1)

SDA

SCL

INTERFACE

32KHz

OSCILLATOR

CRYSTAL

AI07007

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27

M41T80M6F

Mfr. #:

Buy M41T80M6F

Manufacturer:

STMicroelectronics

Description:

Real Time Clock Serial 160 (20x8)

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

M41T80M6F

M41T80M6F

Products related to this Datasheet