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ISL12022MIBZ bảng dữ liệu(PDF) 8 Page - Intersil Corporation

tên linh kiện ISL12022MIBZ
Giải thích chi tiết về linh kiện  Real Time Clock with Embedded Crystal, 짹5ppm Accuracy
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nhà sản xuất  INTERSIL [Intersil Corporation]
Trang chủ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12022MIBZ bảng dữ liệu(HTML) 8 Page - Intersil Corporation

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8
FN6668.4
December 18, 2008
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
available by checking the Status Register, or the device can
be configured to provide a hardware interrupt via the
IRQ/FOUT 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 VBAT
pin allows the device to be backed up by battery or
supercapacitor with automatic switchover from VDD to VBAT.
The ISL12022M device is specified for VDD = 2.7V 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 VBAT level is monitored and reported against
preselected levels. The first report is registered when the
VBAT level falls below 85% of nominal level; the second level
is set for 75%. Battery levels are stored in VBATM registers.
The ISL12022M offers a “Brownout” alarm once the VDD falls
below a pre-selected trip level. This allows system Micro to
save vital information to memory before complete power loss.
There are six VDD levels that could be selected for initiation of
the Brownout alarm.
FIGURE 8. IDD vs TEMPERATURE, 3 DIFFERENT FOUT
FIGURE 9. IBAT WITH TSE = 1, BTSE = 1 vs TEMPERATURE
FIGURE 10. IDD WITH TSE = 1 vs TEMPERATURE
FIGURE 11. OSCILLATOR CHANGE vs TEMPERATURE AT
DIFFERENT AGING SETTINGS (IATR) (BETA SET
FOR 1ppm STEPS)
Typical Performance Curves
Temperature is +25°C unless otherwise specified. (Continued)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-20
0
20
406080
TEMPERATURE (°C)
FOUT = 32kHz
FOUT = 64Hz
FOUT = 1Hz
20
30
40
50
60
70
80
90
100
110
-40
-20
0
2040
6080
TEMPERATURE (°C)
VDD = 1.8V
VBAT = 5.5V
VDD = 3.0V
40
50
60
70
80
90
100
110
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
VDD = 2.7V
VBAT = 5.5V
VDD = 3.3V
-80
-60
-40
-20
0
20
40
60
80
-40
-20
0
2040
6080
TEMPERATURE (°C)
62.5ppm
32ppm
-31ppm
-61.5ppm
0ppm
ISL12022M


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