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ISL12022M Arkusz danych(PDF) 10 Page - Intersil Corporation

Numer części ISL12022M
Szczegółowy opis  Low Power RTC with Battery Backed SRAM, Integrated 짹5ppm Temperature Compensation, and Auto Daylight Saving
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12022M Arkusz danych(HTML) 10 Page - Intersil Corporation

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10
FN6668.5
July 10, 2009
The device Time Stamps the switchover from VDD to VBAT
and VBAT to VDD, and the time is stored in tSV2B and tSB2V
registers respectively. If multiple VDD power-down sequences
occur before the status is read, the earliest VDD to VBAT
power-down time is stored and the most recent VBAT to VDD
time is stored.
Temperature conversion and compensation can be enabled
in battery backup mode. Bit BTSE in the BETA register
controls this operation, as described in “BETA Register
(BETA)” on page 17.
Power Failure Detection
The ISL12022M provides a Real Time Clock Failure Bit
(RTCF) to detect total power failure. It allows users to
determine if the device has powered up after having lost all
power to the device (both VDD and VBAT).
Brownout Detection
The ISL12022M monitors the VDD level continuously and
provides warning if the VDD level drops below prescribed
levels. There are six (6) levels that can be selected for the
trip level. These values are 85% below popular VDD levels.
The LVDD bit in the Status Register will be set to “1” when
brownout is detected. Note that the I2C serial bus remains
active unless the Battery VTRIP levels are reached.
Battery Level Monitor
The ISL12022M has a built-in warning feature once the
backup battery level drops first to 85% and then to 75% of
the battery’s nominal VBAT level. When the battery voltage
drops to between 85% and 75%, the LBAT85 bit is set in the
status register. When the level drops below 75%, both
LBAT85 and LBAT75 bits are set in the status register.
The battery level monitor is not functional in battery backup
mode. In order to read the monitor bits after powering up
VDD, instigate a battery level measurement by setting the
TSE bit to "1" (BETA register), and then read the bits.
There is a Battery Time Stamp Function available. Once the
VDD is low enough to enable switchover to the battery, the
RTC time/date are written into the TSV2B register. This
information can be read from the TSV2B registers to discover
the point in time of the VDD power-down. If there are multiple
power-down cycles before reading these registers, the first
values stored in these registers will be retained. These
registers will hold the original power-down value until they are
cleared by setting CLRTS = 1 to clear the registers.
The normal power switching of the ISL12022M is designed
to switch into battery backup mode only if the VDD power is
lost. This will ensure that the device can accept a wide range
of backup voltages from many types of sources while reliably
switching into backup mode.
Note that the ISL12022M is not guaranteed to operate with
VBAT < 1.8V. If the battery voltage is expected to drop lower
than this minimum, correct operation of the device, (especially
after a VDD power-down cycle) is not guaranteed.
The minimum VBAT to insure SRAM is stable is 1.0V. Below
that, the SRAM may be corrupted when VDD power resumes.
Real Time Clock Operation
The Real Time Clock (RTC) uses an integrated 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
ISL12022M 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.
Single Event and Interrupt
The alarm mode is enabled via the MSB 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, the IRQ/FOUT 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/FOUT 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 “ALARM Registers (10h to 15h)” on page 19.
Frequency Output Mode
The ISL12022M has the option to provide a clock output
signal using the IRQ/FOUT open drain output pin. The
frequency output mode is set by using the FO bits to select
15 possible output frequency values from 1/32Hz to 32kHz.
The frequency output can be enabled/disabled during
Battery Backup mode using the FOBATB bit.
General Purpose User SRAM
The ISL12022M provides 128 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.
ISL12022M


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