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PDF M41TM6TR Data sheet ( Hoja de datos )

Número de pieza M41TM6TR
Descripción 512 bit 64b x8 Serial Access TIMEKEEPER SRAM
Fabricantes ST Microelectronics 
Logotipo ST Microelectronics Logotipo



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No Preview Available ! M41TM6TR Hoja de datos, Descripción, Manual

M41T00
Serial Access TIMEKEEPER®
s 2.0V to 5.5V SUPPLY VOLTAGE
s COUNTERS for SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEARS and
CENTURY
s YEAR 2000 COMPLIANT
s SOFTWARE CLOCK CALIBRATION
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s I2C BUS COMPATIBLE
s ULTRA-LOW BATTERY SUPPLY CURRENT
of 1µA
s LOW OPERATING CURRENT of 300µA
s OPERATING TEMPERATURE of –40 to 85°C
s AUTOMATIC LEAP YEAR COMPENSATION
s SPECIAL SOFTWARE PROGRAMMABLE
OUTPUT
DESCRIPTION
The M41T00 TIMEKEEPER® RAM is a low power
Serial TIMEKEEPER with a built-in 32.768kHz os-
cillator (external crystal controlled). Eight bytes of
the RAM are used for the clock/calendar function
and are configured in binary coded decimal (BCD)
format. Addresses and data are transferred serial-
ly via a two-line bi-directional bus. The built-in ad-
dress register is incremented automatically after
each write or read data byte.
Table 1. Signal Names
OSCI
Oscillator Input
OCSO
Oscillator Output
FT/OUT
Frequency Test / Output Driver
(Open Drain)
SDA
Serial Data Address Input / Output
SCL
Serial Clock
VBAT
Battery Supply Voltage
VCC Supply Voltage
VSS Ground
May 2000
8
1
SO8 (M)
150mil Width
Figure 1. Logic Diagram
VCC VBAT
OSCI
SCL
M41T00
VSS
OSCO
SDA
FT/OUT
AI00530
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M41TM6TR pdf
M41T00
Table 6. DC Characteristics
(TA = –40 to 85°C; VCC = 2.0V to 5.5V)
Symbol
Parameter
Test Condition
Min Typ Max
ILI Input Leakage Current
0V VIN VCC
±1
ILO Output Leakage Current
0V VOUT VCC
±1
ICC1 Supply Current
Switch Frequency = 100kHz
300
ICC2 Supply Current (Standby)
SCL, SDA = VCC – 0.3V
70
VIL Input Low Voltage
–0.3
0.3 VCC
VIH Input High Voltage
0.7 VCC
VCC + 0.8
VOL Output Low Voltage
IOL = 3mA
0.4
VBAT(1) Battery Supply Voltage
2 3 3.5
IBAT Battery Supply Current
TA = 25°C, VCC = 0V,
Oscillator ON, VBAT = 3V
0.8 1
Note: 1. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
Unit
µA
µA
µA
µA
V
V
V
V
µA
Table 7. Power Down/Up Trip Points DC Characteristics (1)
(TA = –40 to 85°C)
Symbol
Parameter
Min Typ Max
VSO (2) Battery Back-up Switchover Voltage
VBAT – 0.70 VBAT – 0.50 VBAT – 0.30
Note: 1. All voltages referenced to VSS.
2. Switch-over and deselect point.
Unit
V
Table 8. Crystal Electrical Characteristics
(Externally Supplied)
Symbol
Parameter
Min
Typ
Max
Unit
fO Resonant Frequency
32.768
kHz
RS Series Resistance
35 k
CL Load Capacitance
12.5
pF
Note: Load capacitors are integrated within the M41T00. Circuit board layout considerations for the 32.768kHz crystal of minimum trace
lengths and isolation from RF generating signals should be taken into account.
STMicroelectronics recommends the KDS DT-38 Tuning Fork Type quartz crystal for industrial temperature operations.
KDS can be contacted at 913-491-6825 or http://www.kdsj.co.jp for further information on this crystal type.
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M41TM6TR arduino
Figure 13. Clock Calibration
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
M41T00
AI00594B
Two methods are available for ascertaining how
much calibration a given M41T00 may require.
The first involves simply setting the clock, letting it
run for a month and comparing it to a known accu-
rate reference (like WWV broadcasts). While that
may seem crude, it allows the designer to give the
end user the ability to calibrate his clock as his en-
vironment may require, even after the final product
is packaged in a non-user serviceable enclosure.
All the designer has to do is provide a simple utility
that accessed the Calibration byte.
The second approach is better suited to a manu-
facturing environment, and involves the use of
some test equipment. When the Frequency Test
(FT) bit, the seventh-most significant bit in the
Control Register, is set to a '1', and the oscillator is
running at 32,768Hz, the FT/OUT pin of the device
will toggle at 512Hz. Any deviation from 512Hz in-
dicates the degree and direction of oscillator fre-
quency shift at the test temperature.
For example, a reading of 512.01024Hz would in-
dicate a +20ppm oscillator frequency error, requir-
ing a –10(XX001010) to be loaded into the
Calibration Byte for correction. Note that setting or
changing the Calibration Byte does not affect the
Frequency test output frequency.
OUTPUT DRIVER PIN
When the FT bit is not set, the FT/OUT pin be-
comes an output driver that reflects the contents of
D7 of the control register. In other words, when D6
of location 7 is a zero and D7 of location 7 is a zero
and then the FT/OUT pin will be driven low.
Note: The FT/OUT pin is open drain which re-
quires an external pull-up resistor.
POWER-ON DEFAULTS
Upon initial application of power to the device, the
FT bit will be set to a '0' and the OUT bit will be set
to a '1'. All other Register bits will initially power-on
in a random state.
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