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PDF M41T80M6TR Data sheet ( Hoja de datos )

Número de pieza M41T80M6TR
Descripción SERIAL ACCESS RTC WITH ALARMS
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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M41T80
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 SERIAL INTERFACE SUPPORTS I2C BUS
(400KHz)
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION
s LOW OPERATING CURRENT OF 200µA
s OPERATING TEMPERATURE OF –40 TO
85°C
Figure 1. Logic Diagram
VCC
XI
XO
SCL
SDA
M41T80
IRQ/OUT/SQW
F32k
VSS
AI07005
Figure 2. 8-pin SOIC Package
8
1
SO8 (M)
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
F32k
32kHz Square Wave Output (Open
drain)
VCC Supply Voltage
VSS Ground
October 2002
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1 page




M41T80M6TR pdf
M41T80
DC AND AC PARAMETERS
This section summarizes the operating and mea-
surement conditions, as well as the DC and AC
characteristics of the device. The parameters in
the following DC and AC Characteristic tables are
derived from tests performed under the Measure-
ment Conditions listed in the relevant tables. De-
signers should check that the operating conditions
in their projects match the measurement condi-
tions when using the quoted parameters.
Table 3. Operating and AC Measurement Conditions
Parameter
Supply Voltage (VCC)
Ambient Operating Temperature (TA)
Load Capacitance (CL)
Input Rise and Fall Times
Input Pulse Voltages
Input and Output Timing Ref. Voltages
Note: Output Hi-Z is defined as the point where data is no longer driven.
Figure 5. AC Measurement I/O Waveform
M41T80
2.0 to 5.5V
–40 to 85°C
100pF
50ns
0.2VCC to 0.8 VCC
0.3VCC to 0.7 VCC
0.8VCC
0.2VCC
0.7VCC
0.3VCC
AI02568
Table 4. Capacitance
Symbol
Parameter(1,2)
CIN Input Capacitance
COUT(3)
Output Capacitance
tLP Low-pass filter input time constant (SDA and SCL)
Note: 1. Effective capacitance measured with power supply at 5V; sampled only, not 100% tested.
2. At 25°C, f = 1MHz.
3. Outputs deselected.
Min Max Unit
7 pF
10 pF
50 ns
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M41T80M6TR arduino
Figure 11. Alternative READ Mode Sequence
M41T80
BUS ACTIVITY:
MASTER
SDA LINE
S
DATA n
DATA n+1
DATA n+X P
BUS ACTIVITY:
SLAVE
ADDRESS
AI00895
WRITE Mode
In this mode the master transmitter transmits to
the M41T80 slave receiver. Bus protocol is shown
in Figure 12, page 11. Following the START con-
dition and slave address, a logic '0' (R/W=0) is
placed on the bus and indicates to the addressed
device that word address “An” will follow and is to
be written to the on-chip address pointer. The data
word to be written to the memory is strobed in next
Figure 12. WRITE Mode Sequence
and the internal address pointer is incremented to
the next address location on the reception of an
acknowledge clock. The M41T80 slave receiver
will send an acknowledge clock to the master
transmitter after it has received the slave address
see Figure 9, page 10 and again after it has re-
ceived the word address and each data byte.
BUS ACTIVITY:
MASTER
SDA LINE
S
WORD
ADDRESS (An)
DATA n
DATA n+1
DATA n+X P
BUS ACTIVITY:
SLAVE
ADDRESS
AI00591
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