ISL12022MIBZ-T Intersil, ISL12022MIBZ-T Datasheet - Page 10

• Manufacturer Part Number: ISL12022MIBZ-T
• Description: IC RTC/CALENDAR TEMP SENS 20SOIC
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12022MIBZ-T

• Memory Size: 128B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL12022MIBZ-TCT

Typical Performance Curves
General Description
The ISL12022M device is a low power real time clock
(RTC) with embedded temperature sensor and crystal.
It contains crystal frequency compensation circuitry
over the operating temperature range good to ±5ppm
accuracy. It also contains a clock/calendar with Daylight
Savings Time (DST) adjustment, 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 internal 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 ISL12022M can be
programmed for automatic Daylight Saving Time (DST)
adjustment by entering local DST information.
The ISL12022M’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
FIGURE 8. I
FIGURE 10. I
110
100
5.5
5.0
4.5
4.0
3.5
3.0
2.5
90
80
70
60
50
40
-40
-40
DD
-20
-20
vs TEMPERATURE, 3 DIFFERENT F
DD
V
DD
WITH TSE = 1 vs TEMPERATURE
= 2.7V
0
TEMPERATURE (°C)
TEMPERATURE (°C)
0
F
V
10
OUT
BAT
20
20
= 32kHz
= 5.5V
F
OUT
40
40
= 1Hz
F
OUT
V
DD
60
60
= 64Hz
= 3.3V
80
80
ISL12022M
OUT
Temperature is +25°C unless otherwise specified. (Continued)
available by checking the Status Register, or the device
can be configured to provide a hardware interrupt via the
IRQ/F
allowing a periodic interrupt every minute, every hour,
every day, etc.
The device also offers a backup power input pin. This
V
supercapacitor with automatic switchover from V
V
to 5.5V and the clock/calendar portion of the device
remains fully operational in battery backup mode down
to 1.8V (Standby Mode). The V
reported against preselected levels. The first report is
registered when the V
nominal level; the second level is set for 75%. Battery
levels are stored in PWR_V
The ISL12022M offers a “Brownout” alarm once the V
falls below a pre-selected trip level. This allows system
Micro to save vital information to memory before
complete power loss. There are six V
could be selected for initiation of the Brownout alarm.
BAT
BAT
FIGURE 11. OSCILLATOR CHANGE vs TEMPERATURE
FIGURE 9. I
. The ISL12022M device is specified for V
pin allows the device to be backed up by battery or
OUT
110
100
-20
-40
-60
-80
80
60
40
20
90
80
70
60
50
40
30
20
0
-40
-40
pin. There is a repeat mode for the alarm
TEMPERATURE
AT DIFFERENT AGING SETTINGS (IATR)
(BETA SET FOR 1ppm STEPS)
BAT
V
-20
-20
DD
WITH TSE = 1, BTSE = 1 vs
-61.5ppm
32ppm
= 3.0V
V
BAT
0ppm
BAT
TEMPERATURE (°C)
0
TEMPERATURE (°C)
0
level falls below 85% of
V
= 5.5V
BAT
DD
BAT
= 1.8V
20
20
registers.
62.5ppm
level is monitored and
-31ppm
DD
40
40
levels that
60
60
DD
June 4, 2010
DD
= 2.7V
FN6668.7
80
80
to
DD