ISL12057IBZ 데이터 시트보기 (PDF) - Renesas Electronics
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ISL12057IBZ
Renesas Electronics
ISL12057IBZ Datasheet PDF : 18 Pages
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ISL12057
Typical Performance Curves Temperature is +25°C unless otherwise specified
0.7
1.0
0.6
0.5
0.4
0.3
0.2
0.1
0
1.4
1.9
2.4
2.9
3.4
VDD (V)
FIGURE 2. IDD1 vs VDD
0.8
3.6
0.6
3.0
0.4
1.8
1.4
0.2
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 3. IDD1 vs TEMPERATURE
1.2
1.1
32768Hz
1.0
0.9
0.8
0.7
8192Hz
0.6
4096Hz
0.5
0.4
0.3
1Hz
0.2
1.4
1.9
2.4
2.9
3.4
VDD (V)
FIGURE 4. IDD vs VDD vs FOUT
General Description
The ISL12057 device is a low-power, real-time clock with
clock/calendar, power-fail indicator, and alarm function.
The oscillator uses an external, low-cost 32.768kHz crystal
with 6pF load capacitance. 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 ISL12057 has two flexible alarms, and each can be set to any
clock/calendar value for a match; for example, every minute,
every Tuesday, or at 5:23 a.m. on the first day of every month.
The alarm status is available by checking the Status Register, or
the device can be configured to provide a hardware interrupt via
the IRQ1/FOUT or IRQ2 pin. There is a repeat mode for the alarm,
which allows a periodic interrupt every second or every minute.
32769.0
32768.8
32768.6
32768.4
32768.2
32768.0
32767.8
32767.6
32767.4
32767.2
32767.0
1.4
1.9
2.4
2.9
3.4
VDD (V)
FIGURE 5. FOUT VS VDD WITH A TYPICAL 32.768kHZ CRYSTAL
Pin Description
X1, X2
The X1 and X2 pins are the input and output, respectively, of
an inverting amplifier. An external 32.768kHz quartz crystal
with 6pF load capacitance is used with the ISL12057 to supply
a timebase for the real-time clock. See 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.
X1
X2
FIGURE 6. RECOMMENDED CRYSTAL CONNECTION
FN6755 Rev 2.00
Sep 25, 2015
Page 7 of 18
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