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PDF M41T81MY6 Data sheet ( Hoja de datos )

Número de pieza M41T81MY6
Descripción SERIAL ACCESS RTC WITH ALARMS
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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M41T81
SERIAL ACCESS RTC WITH ALARMS
FEATURES SUMMARY
s 2.0 TO 5.5V CLOCK OPERATING VOLTAGE
s COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s SERIAL INTERFACE SUPPORTS I2C BUS
(400KHz PROTOCOL)
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (valid even during Battery Back-up
Mode)
s WATCHDOG TIMER
s LOW OPERATING CURRENT OF 400µA
s BATTERY BACK-UP NOT RECOMMENDED
FOR 3.0V APPLICATIONS (CAPACITOR
BACK-UP ONLY)
s BATTERY OR SUPER-CAP BACK-UP
s OPERATING TEMPERATURE OF –40 TO
85°C
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 1µA
s PACKAGE OPTIONS INCLUDE A 28-LEAD or
18-LEAD EMBEDDED CRYSTAL SOIC
Figure 1. 8-pin SOIC Package
8
1
SO8 (M)
Figure 2. 28-pin (300mil) SOIC Package*
EMBEDDED Crystal
SOX28 (MX)
Figure 3. 18-pin (300mil) SOIC Package*
EMBEDDED Crystal
18
1
SOX18 (MY)
September 2003
Rev. 2.0
1/28

1 page




M41T81MY6 pdf
Figure 5. 8-pin SOIC (M) Connections
XI
XO
VBAT
VSS
18
27
3 M41T81 6
45
VCC
IRQ/FT/OUT/SQW
SCL
SDA
AI04769
Figure 6. 18-pin, 300mil SOIC (MY)
Connections
NC
NC
NC
NC
NC
NC
NC
VBAT
VSS
1 18
2 17
3 16
4 15
5 14
6 13
7 M41T81 12
8 11
9 10
NC
NC
NC
VCC
NC
IRQ/FT/OUT/SQW
NC
SCL
SDA
AI07830
Figure 8. Block Diagram
CRYSTAL
32KHz
OSCILLATOR
SDA
SCL
VCC
I2C
INTERFACE
WRITE
PROTECT
VBAT
VSO(2) COMPARE
Note 1. Open drain output
Note 2. VSO = VBAT – 0.5V (typ)
M41T81
Figure 7. 28-pin, 300mil SOIC (MX)
Connections
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
VBAT
VSS
1 28
2 27
3 26
4 25
5 24
6 23
7 M41T81 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
NC
IRQ/FT/OUT/SQW
NC
VSS
NC
SCL
NC
VCC(1)
NC
IRQ/FT/OUT/SQW(1)
SDA
SCL(1)
SDA(1)
AI07805
Note: 1. No Connect (NC) pin for 28-pin SOIC, but should be con-
sidered to have indicated function in anticipation of re-
placement with 18-pin SOIC.
REAL TIME CLOCK
CALENDAR
RTC W/ALARM
& CALIBRATION AFE
WDF
WATCHDOG
SQUARE WAVE SQWE
INTERNAL
POWER
IRQ/FT/OUT/SQW(1)
AI04616
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5 Page





M41T81MY6 arduino
Figure 12. Bus Timing Requirements Sequence
SDA
tBUF
SCL
P
tHD:STA
tR
tF
tHIGH
S tLOW
tSU:DAT
tHD:DAT
M41T81
tHD:STA
tSU:STA
SR
tSU:STO
P
AI00589
Table 7. AC Characteristics
Sym
Parameter(1)
Min
Typ
Max
Units
fSCL SCL Clock Frequency
0 400 kHz
tLOW
Clock Low Period
1.3 µs
tHIGH
Clock High Period
600 ns
tR SDA and SCL Rise Time
300 ns
tF SDA and SCL Fall Time
300 ns
tHD:STA
START Condition Hold Time
(after this period the first clock pulse is generated)
600
ns
tSU:STA
START Condition Setup Time
(only relevant for a repeated start condition)
600
ns
tSU:DAT(2) Data Setup Time
100 ns
tHD:DAT Data Hold Time
0 µs
tSU:STO STOP Condition Setup Time
600
ns
tBUF
Time the bus must be free before a new
transmission can start
1.3
µs
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5V (except where noted).
2. Transmitter must internally provide a hold time to bridge the undefined region (300ns max) of the falling edge of SCL.
11/28

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