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ISL12058IUZ-T Fiches technique(PDF) 7 Page - Intersil Corporation

No de pièce ISL12058IUZ-T
Description  Low Cost and Low Power I2C-Bus??Real Time Clock/Calendar
Download  19 Pages
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12058IUZ-T Fiches technique(HTML) 7 Page - Intersil Corporation

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7
FN6756.0
June 15, 2009
General Description
The ISL12058 device is a low power real time clock with
clock/calendar, and alarm.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for
hours, minutes, and seconds. The device has calendar
registers for date, month, year and day of the week. The
calendar is accurate through 2099, with automatic leap year
correction.
The ISL12058's flexible alarm can be set to any
clock/calendar value for a match. For example, every
minute, every Tuesday or at 5:23 AM on March 21. The
alarm status is available by checking the Status Register, or
the device can be configured to provide a hardware interrupt
via the IRQ/FOUT pin.
Pin Descriptions
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 ISL12058 to supply a timebase for the real
time clock. Refer to Figure 6.
The device can also be driven directly from a 32.768kHz
square wave source with peak to peak voltage from 0V to
VDD at X1 pin with X2 pin floating.
Typical Performance Curves Temperature is +25°C unless otherwise specified
FIGURE 2. IDD1 vs VDD
FIGURE 3. IDD1 vs TEMPERATURE
FIGURE 4. IDD vs VDD vs FOUT
FIGURE 5. FOUT vs VDD WITH A TYPICAL 32.768kHZ CRYSTAL
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1.41.9
2.42.9
3.4
VDD (V)
0.2
0.4
0.6
0.8
1.0
-40
-20
0
204060
80
TEMPERATURE (°C)
3.0
1.8
1.4
3.6
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.4
1.9
2.4
2.9
3.4
8192Hz
1Hz
32768Hz
4096Hz
VDD (V)
32767.0
32767.2
32767.4
32767.6
32767.8
32768.0
32768.2
32768.4
32768.6
32768.8
32769.0
1.41.9
2.42.9
3.4
VDD (V)
FIGURE 6. RECOMMENDED CRYSTAL CONNECTION
X1
X2
ISL12058


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