ISL1209IU10 datasheet(10/24 Pages) INTERSIL

Numer części	ISL1209IU10

Szczegółowy opis	Low Power RTC with Battery Backed SRAM and Event Detection

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Producent	INTERSIL [Intersil Corporation]

Strona internetowa	http://www.intersil.com/cda/home

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10

FN6109.4

October 17, 2006

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.

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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