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ISL1221 数据表(PDF) 7 Page - Intersil Corporation |
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ISL1221 数据表(HTML) 7 Page - Intersil Corporation |
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7 / 24 page  7 FN6316.0 June 22, 2006 General Description The ISL1221 device is a low power Real Time Clock with Security and Event function, Time Stamp in both normal and battery modes, timing and crystal compensation, clock/calendar, power fail indicator, periodic or polled alarm, intelligent battery backup switching, and battery-backed user SRAM. The Event Detection function can be used for tamper detection, security or other chassis or generic system monitoring. Upon a valid event detection, the ISL1221 sets the Event Detection bit (EVT bit) in the status register, stores time stamp information on board memory, and, can optionally: 1) Issue an Event Output signal (EVDET pin), 2) At the time the event occurred, stop the RTC registers from advancing. The event monitor and time stamp functions in both main VDD and battery back up modes. The event monitor can also be configured for various input detection rates to optimize power consumption for the application. In addition, the Event Monitor pin (EVIN) has a selectable glitch filter to avoid switch de-bouncing. 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 ISL1221'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 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 SuperCap with automatic switchover from VDD to VBAT. The entire ISL1221 device is fully operational from 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). 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 ISL1221 to supply a timebase for the real time clock. Internal compensation circuitry provides high accuracy over the operating temperature range from -40°C to +85°C. This oscillator compensation network can be used to calibrate the crystal timing accuracy over temperature either during manufacturing or with an external temperature sensor and microcontroller for active compensation. The device can also be driven directly from a 32.768kHz source at pin X1. FIGURE 7. EVIN IPULLUP vs VDD FIGURE 8. IPULLUP vs TEMPERATURE AT VBAT = 1.8V Typical Performance Curves Temperature is +25°C unless otherwise specified (Continued) 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06 5.00E-06 6.00E-06 7.00E-06 8.00E-06 2.533.544.555.5 6 VDD -40°C +25°C +85°C 1.0E-07 2.0E-07 3.0E-07 4.0E-07 5.0E-07 -40 -25 -10 5 20 35 50 65 80 Temperature FIGURE 9. STANDARD OUTPUT LOAD FOR TESTING THE DEVICE WITH VDD = 5.0V SDA AND IRQ/EVDET 1533 Ω 100pF 5.0V FOR VOL= 0.4V AND IOL = 3mA EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V ISL1221 |
类似零件编号 - ISL1221 |
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类似说明 - ISL1221 |
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