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ISL1209IU10Z Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL1209IU10Z Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 24 page 10 FN6109.1 September 27, 2005 Users have the option to connect EVIN (see EVINEB bit) to an internal pull up current source that operates at 1µA (always on mode). User selectable event sampling modes are also available which will effectively reduce power consumption with 1/4-Hz, 1-Hz and 2-Hz sample detection rates. The EVIN input is pulsed ON/OFF when in sampling mode for power savings advantages (See tables below). The EVIN also has a user selectable time based hysteresis filter (see EHYS bits) to implement switch de-bouncing during an event detection. The EVIN signal must be high for the duration of the selected time period. The time periods available are 0 times delay (no time based hysteresis) to 3.9ms, 15.625ms or 31.25ms (see Table 1, 2, 3, and 4). Real Time Clock Operation The Real Time Clock (RTC) uses an external 32.768kHz quartz crystal to maintain an accurate internal representation of second, minute, hour, day of week, date, month, and year. The RTC also has leap-year correction. The clock also corrects for months having fewer than 31 days and has a bit that controls 24 hour or AM/PM format. When the ISL1209 powers up after the loss of both VDD and VBAT, the clock will not begin incrementing until at least one byte is written to the clock register. Accuracy of the Real Time Clock The accuracy of the Real Time Clock depends on the frequency of the quartz crystal that is used as the time base for the RTC. Since the resonant frequency of a crystal is temperature dependent, the RTC performance will also be dependent upon temperature. The frequency deviation of the crystal is a function of the turnover temperature of the crystal from the crystal’s nominal frequency. For example, a ~20ppm frequency deviation translates into an accuracy of ~1 minute per month. These parameters are available from the crystal manufacturer. The ISL1209 provides on-chip crystal compensation networks to adjust load capacitance to tune oscillator frequency from -94ppm to +140ppm. For more detailed information see the Application Section. Single Event and Interrupt The alarm mode is enabled via the ALME bit. Choosing single event or interrupt alarm mode is selected via the IM bit. Note that when the frequency output function is enabled, the alarm function is disabled. The standard alarm allows for alarms of time, date, day of the week, month, and year. When a time alarm occurs in single event mode, an IRQ pin will be pulled low and the alarm status bit (ALM) will be set to “1”. The pulsed interrupt mode allows for repetitive or recurring alarm functionality. Hence, once the alarm is set, the device will continue to alarm for each occurring match of the alarm and present time. Thus, it will alarm as often as every minute (if only the nth second is set) or as infrequently as once a year (if at least the nth month is set). During pulsed interrupt mode, the IRQ pin will be pulled low for 250ms and the alarm status bit (ALM) will be set to “1”. The ALM bit can be reset by the user or cleared automatically using the auto reset mode (see ARST bit). The alarm function can be enabled/disabled during battery backup mode using the FOBATB bit. For more information on the alarm, please see the Alarm Registers Description. Frequency Output Mode The ISL1209 has the option to provide a frequency output signal using the IRQ/FOUT pin. The frequency output mode is set by using the FO bits to select 15 possible output frequency values from 0 to 32kHz. The frequency output can be enabled/disabled during battery backup mode using the FOBATB bit. General Purpose User SRAM The ISL1209 provides 2 bytes of user SRAM. The SRAM will continue to operate in battery backup mode. However, it should be noted that the I2C bus is disabled in battery backup mode. I2C Serial Interface The ISL1209 has an I2C serial bus interface that provides access to the control and status registers and the user TABLE 1. ∆IDD (VDD=3V, tHYS=3.9ms) fSMP DELTA IDD 1/4Hz 20.5nA 1Hz 82nA 2Hz 164nA TABLE 2. ∆IDD (VDD=5.0V, tHYS=3.9ms) fSMP DELTA IDD 1/4Hz 65.8nA 1Hz 263.3nA 2Hz 526.5nA TABLE 3. ∆IDD (VDD=3.0V, tHYS=15.625ms) fSMP DELTA IDD 1/4Hz 82nA 1Hz 328nA 2Hz 656.3nA TABLE 4. ∆IDD (VDD=5.0V, tHYS=15.625ms) fSMP DELTA IDD 1/4Hz 264nA 1Hz 1.05µA 2Hz 2.1µA ISL1209 |
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