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ISL12057IBZ-T Folha de dados(PDF) 7 Page - Intersil Corporation |
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ISL12057IBZ-T Folha de dados(HTML) 7 Page - Intersil Corporation |
7 / 17 page 7 FN6755.0 June 15, 2009 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. 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; each can be set to any clock/calendar value for a match. For example, every minute, every Tuesday or at 5:23 AM on 1st day of a 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 allowing a periodic interrupt every second or every minute. 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 is used with the ISL12057 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 20 40 60 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 1.41.9 2.42.9 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 1.4 1.9 2.4 2.9 3.4 VDD (V) FIGURE 6. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL12057 |
Nº de peça semelhante - ISL12057IBZ-T |
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Descrição semelhante - ISL12057IBZ-T |
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