ISL12022IBZ-T7A Intersil, ISL12022IBZ-T7A Datasheet - Page 8

• Manufacturer Part Number: ISL12022IBZ-T7A
• Description: IC RTC/CALENDAR TEMP SNSR 8SOIC
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12022IBZ-T7A

• Memory Size: 128B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Performance Curves
General Description
The ISL12022 device is a low power real time clock (RTCs)
with embedded temperature sensors. It contains crystal
frequency compensation circuitry over the operating
temperature range, clock/calendar, power fail and low
battery monitors, brownout indicator, 1 periodic or polled
alarm, intelligent battery-backup switching and 128 Bytes of
battery-backed user SRAM.
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. In addition, the ISL12022 can be programmed for
automatic Daylight Savings Time (DST) adjustment by
entering local DST information.
The ISL12022’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/F
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 V
pin allows the device to be backed up by battery or super
capacitor with automatic switchover from V
ISL12022 device is specified for V
clock/calendar portion of the device remains fully operational
in battery-backup mode down to 1.8V (Standby Mode). The
V
levels. The first report is registered when the V
below 85% of nominal level, the second level is set for 75%.
Battery levels are stored in PWR_VBAT registers.
The ISL12022 offers a “Brownout” alarm once the V
below a pre-selected trip level. This allows system Micro to
save vital information to memory before complete power
loss. There are six V
initiation of the Brownout alarm.
BAT
100
110
90
80
70
60
50
40
level is monitored and reported against preselected
-40
FIGURE 8. I
-20
V
DD
DD
DD
WITH TSE = 1 vs TEMPERATURE
= 5.5V
V
DD
0
levels that could be selected for
TEMPERATURE (°C)
= 3.3V
8
20
DD
= 2.7V to 5.5V and the
40
Temperature is +25°C unless otherwise specified. (Continued)
DD
V
BAT
to V
BAT
60
BAT
= 2.7V
level falls
DD
. The
falls
OUT
BAT
80
ISL12022
Pin Descriptions
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 device to supply a timebase for the real time
clock. Internal compensation circuitry with internal
temperature sensor provides frequency corrections for
selected popular crystals to ±5ppm over the operating
temperature range from -40°C to +85°C. (See “Application
Section” on page 25 for recommended crystal). The
ISL12022 allows the user to input via I
temperature variation profile of an individual crystal. The
oscillator compensation network can also be used to
calibrate the initial crystal timing accuracy to less than 1ppm
error at room temperature. The device can also be driven
directly from a 32.768kHz source at pin X1.
V
This input provides a backup supply voltage to the device.
V
supply fails. Device power will automatically switch to the
V
(V
capacitor or tied to ground if not used.
IRQ/F
This dual function pin can be used as an interrupt or
frequency output pin. The IRQ/F
the frequency out control bits of the control/status register. It
is an open drain output.
BAT
BAT
BAT
FIGURE 9. I
TRIP
100
FIGURE 10. RECOMMENDED CRYSTAL CONNECTION
110
90
80
70
60
50
40
30
20
supplies power to the device in the event that the V
input when V
OUT
). This pin can be connected to a battery, a super
-40
V
(Interrupt Output/Frequency Output)
BAT
BAT
-20
= 5.5V
with TSE = 1, BTSE = 1 vs TEMPERATURE
DD
V
BAT
drops below the switchover trip level
0
= 3.0V
TEMPERATURE (°C)
20
OUT
X1
X2
mode is selected via
2
C serial bus the
40
V
BAT
= 1.8V
60
June 23, 2009
FN6659.2
80
DD