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ISL12022MIBZ 数据表(PDF) 11 Page - Renesas Technology Corp |
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ISL12022MIBZ 数据表(HTML) 11 Page - Renesas Technology Corp |
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11 / 32 page  ISL12022M FN6668 Rev 9.00 Page 11 of 32 June 20, 2012 General Description The ISL12022M device is a low power real time clock (RTC) with embedded temperature sensor and crystal. It contains crystal frequency compensation circuitry over the operating temperature range good to ±5ppm accuracy. It also contains a clock/calendar with Daylight Savings Time (DST) adjustment, power fail and low battery monitors, brownout indicator, 1 periodic or polled alarm, intelligent battery backup switching and 128 Bytes of battery- backed user SRAM. The oscillator uses an internal 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. In addition, the ISL12022M can be programmed for automatic Daylight Saving Time (DST) adjustment by entering local DST information. The ISL12022M’s 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. There is a repeat mode for the alarm allowing a periodic interrupt every minute, every hour, every day, etc. The device also offers a backup power input pin. This VBAT pin allows the device to be backed up by battery or supercapacitor with automatic switchover from VDD to VBAT. The ISL12022M device is specified for VDD = 2.7V to 5.5V and the clock/calendar portion of the device remains fully operational in battery backup mode down to 1.8V (Standby Mode). The VBAT level is monitored and reported against preselected levels. The first report is registered when the VBAT level falls below 85% of nominal level; the second level is set for 75%. Battery levels are stored in PWR_VBAT registers. The ISL12022M offers a “Brownout” alarm once the VDD falls below a pre-selected trip level. This allows system Micro to save vital information to memory before complete power loss. There are six VDD levels that could be selected for initiation of the Brownout alarm. FIGURE 10. IDD vs TEMPERATURE, 3 DIFFERENT FOUT FIGURE 11. IBAT WITH TSE = 1, BTSE = 1 vs TEMPERATURE FIGURE 12. IDD WITH TSE = 1 vs TEMPERATURE FIGURE 13. OSCILLATOR CHANGE vs TEMPERATURE AT DIFFERENT AGING SETTINGS (IATR) (BETA SET FOR 1ppm STEPS) Typical Performance Curves Temperature is +25°C unless otherwise specified. (Continued) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -40 -20 0 204060 80 TEMPERATURE (°C) FOUT = 32kHz FOUT = 64Hz FOUT = 1Hz 20 30 40 50 60 70 80 90 100 110 -40 -20 0 20 406080 TEMPERATURE (°C) VDD = 1.8V VBAT = 5.5V VDD = 3.0V 40 50 60 70 80 90 100 110 -40 -20 0 20 40 60 80 TEMPERATURE (°C) VDD = 2.7V VBAT = 5.5V VDD = 3.3V -80 -60 -40 -20 0 20 40 60 80 -40 -20 0 2040 6080 TEMPERATURE (°C) 62.5ppm 32ppm -31ppm -61.5ppm 0ppm |
类似零件编号 - ISL12022MIBZ |
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类似说明 - ISL12022MIBZ |
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