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ISL1209 Folha de dados(PDF) 7 Page - Intersil Corporation |
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ISL1209 Folha de dados(HTML) 7 Page - Intersil Corporation |
7 / 24 page 7 FN6109.1 September 27, 2005 General Description The ISL1209 device is a low power Real Time Clock with Security and Event function 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 ISL1209 sets the Event Detection bit (EVT bit) in the status register 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 can function 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 ISL1209's powerful 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 ISL1209 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 ISL1209 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. VBAT This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that the VDD supply fails. This pin can be connected to a battery, a Super Cap or tied to ground if not used. EVIN (Event Input) The EVIN pin is an input that is used to detect an externally monitored event. When a high signal is present at the EVIN pin, an “event” is detected. This input may be used for various monitoring functions, such as the opening of a detection switch on a chassis or door. The event detection circuit can be user enabled or disabled (see EVEN bit) and provides the option to be operational in battery backup modes (see EVBATB bit). When the event detection is disabled the EVIN pin is gated OFF. See functional Description for more details. EVDET (Event Detect Output) The EVDET is an open drain output which will go low when an event is detected at the EVIN pin. If the event detection function is enabled, the EVDET output will go low and stay low until the EVT bit is cleared (see EVIN pin description). IRQ/FOUT (Interrupt Output/Frequency Output) This dual function pin can be used as an interrupt or frequency output pin. The IRQ/FOUT mode is selected via the frequency out control bits of the control/status register. • Interrupt Mode. The pin provides an interrupt signal output. This signal notifies a host processor that an alarm FIGURE 7. STANDARD OUTPUT LOAD FOR TESTING THE DEVICE WITH VDD = 5.0V SDA AND IRQ/FOUT 1533 Ω 100pF 5.0V FOR VOL= 0.4V AND IOL = 3mA EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V FIGURE 8. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL1209 |
Nº de peça semelhante - ISL1209 |
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Descrição semelhante - ISL1209 |
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