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PDF X1288 Datasheet ( Hoja de datos )

Número de pieza X1288
Descripción 2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
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X1288 datasheet

1 Page

X1288 pdf
Preliminary Information
X1288
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................... -65°C to +135°C
Storage Temperature......................... -65°C to +150°C
Voltage on VCC, VBACK and PHZ/IRQ
pin (respect to ground) ............................-0.5V to 7.0V
Voltage on SCL, SDA, X1 and X2
pin (respect to ground) ............... -0.5V to 7.0V or 0.5V
above VCC or VBACK (whichever is higher)
DC Output Current .............................................. 5 mA
Lead Temperature (Soldering, 10 sec) ...............300°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation
of the device at these or any other conditions above
those indicated in the operational sections of this spec-
ification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
device reliability.
DC OPERATING CHARACTERISTICS (Temperature = -40°C to +85°C, unless otherwise stated.)
Symbol
VCC
VBACK
VCB
VBC
Parameter
Main Power Supply
Backup Power Supply
Switch to Backup Supply
Switch to Main Supply
Conditions Min Typ Max Unit
2.7 5.5 V
1.8 5.5 V
VBACK -0.2
VBACK
VBACK -0.1
VBACK +0.2
V
V
Notes
OPERATING CHARACTERISTICS
Symbol
Parameter
ICC1
Read Active Supply
Current
ICC2
Program Supply Current
(nonvolatile)
ICC3
Main Timekeeping
Current
IBACK
ILI
ILO
VIL
Timekeeping Current –
(Low Voltage Sense and
Watchdog Timer dis-
abled
Input Leakage Current
Output Leakage Current
Input LOW Voltage
Conditions
VCC = 2.7V
VCC = 5.0V
VCC = 2.7V
VCC = 5.0V
VCC = 2.7V
VCC = 5.0V
VBACK = 1.8V
VBACK = 3.3V
Min
-0.5
VIH
VHYS
VOL1
VOL2
VOH2
Input HIGH Voltage
Schmitt Trigger Input
Hysteresis
Output LOW Voltage for
SDA and RESET
Output LOW Voltage for
PHZ/IRQ
Output HIGH Voltage for
PHZ/IRQ
VCC related level
VCC = 2.7V
VCC = 5.5V
VCC = 2.7V
VCC = 5.5V
VCC = 2.7V
VCC = 5.5V
VCC x 0.7 or
VBACK x 0.7
.05 x VCC or
.05 x VBACK
VCC x 0.7
VCC x 0.7
Typ
1.25
1.5
Max
400
800
2.5
3.0
10
20
Unit
µA
µA
mA
mA
µA
µA
µA
µA
Notes
1, 5, 7, 14
2, 5, 7, 14
3, 7, 8, 14, 15
3, 6, 9, 14, 15
“See Perfor-
mance Data”
10
10
VCC x 0.2 or
VBACK x 0.2
VCC + 0.5 or
VBACK + 0.5
µA
µA
V
V
V
10
10
13
13
13
0.4
0.4
VCC x 0.3
VCC x 0.3
V
V
V
11
11
12
REV 1.1.30 3/24/04
www.xicor.com
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5 Page

X1288 arduino
Preliminary Information
X1288
When used as frequency output, this signal has a fre-
quency of 32.768kHz, 100Hz, 1Hz or inactive.
When used as interrupt output, this signal notifies a
host processor that an alarm has occurred and an
action is required. It is an active LOW output.
The control bits for this function are FO1 and FO0 and
are found in address 0011h of the Clock Control Mem-
ory map. See “Programmable Frequency Output Bits—
FO1, FO0” on page 15.
X1, X2
The X1 and X2 pins are the input and output,
respectively, of an inverting amplifier. An external
32.768kHz quartz crystal is used with the X1288 to
supply a timebase for the real time clock. The
recommended crystal is a Citizen CFS206-32.768KDZF.
Internal compensation circuitry is included to form a
complete oscillator circuit. Care should be taken in the
placement of the crystal and the layout of the circuit.
Plenty of ground plane around the device and short
traces to X1 and X2 are highly recommended. See
Application section for more information.
Figure 2. Recommended Crystal connection
X1
X2
POWER CONTROL OPERATION
The power control circuit accepts a VCC and a VBACK
input. The power control circuit powers the clock from
VBACK when VCC < VBACK - 0.2V. It will switch back to
power the device from VCC when VCC exceeds VBACK.
Figure 3. Power Control
VBACK
VCC
Off
Voltage
On
In
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external
32.768kHz quartz crystal to maintain an accurate inter-
nal representation of the 1/100 of a second, second,
minute, hour, day, date, month, and year. The RTC has
leap-year correction. The clock also corrects for
months having fewer than 31 days and has a bit that
controls 24 hour or AM/PM format. When the X1288
powers up after the loss of both VCC and VBACK, the
clock will not operate until at least one byte is written to
the clock register.
Reading the Real Time Clock
The RTC is read by initiating a Read command and
specifying the address corresponding to the register of
the Real Time Clock. The RTC Registers can then be
read in a Sequential Read Mode. Since the clock runs
continuously and a read takes a finite amount of time,
there is the possibility that the clock could change during
the course of a read operation. In this device, the time is
latched by the read command (falling edge of the clock on
the ACK bit prior to RTC data output) into a separate latch
to avoid time changes during the read operation. The
clock continues to run. Alarms occurring during a read
are unaffected by the read operation.
Writing to the Real Time Clock
The time and date may be set by writing to the RTC
registers. To avoid changing the current time by an
uncompleted write operation, the current time value is
loaded into a separate buffer at the falling edge of the
clock on the ACK bit before the RTC data input bytes,
the clock continues to run. The new serial input data
replaces the values in the buffer. This new RTC value
is loaded back into the RTC Register by a stop bit at
the end of a valid write sequence. An invalid write
operation aborts the time update procedure and the
contents of the buffer are discarded. After a valid write
operation the RTC will reflect the newly loaded data
beginning with the SSEC register reset to “0” at the
next sub-second update after the stop bit is written.
The 1Hz frequency output from the PHZ/IRQ pin will
be reset to restart after the stop bit is written. The RTC
continues to update the time while an RTC register
write is in progress and the RTC continues to run dur-
ing any nonvolatile write sequences. A single byte may
be written to the RTC without affecting the other bytes.
Accuracy of the Real Time Clock
The accuracy of the Real Time Clock depends on the
frequency of the quartz crystal that is used as the time
base for the RTC. Since the resonant frequency of a
crystal is temperature dependent, the RTC performance
will also be dependent upon temperature. The frequency
deviation of the crystal is a function of the turnover
temperature of the crystal from the crystal’s nominal
REV 1.1.30 3/24/04
www.xicor.com
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