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ISL12057 bảng dữ liệu(PDF) 7 Page - Renesas Technology Corp |
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ISL12057 bảng dữ liệu(HTML) 7 Page - Renesas Technology Corp |
7 / 18 page ISL12057 FN6755 Rev 2.00 Page 7 of 18 Sep 25, 2015 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. 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. 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 |
Số phần tương tự - ISL12057 |
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Mô tả tương tự - ISL12057 |
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