ISL12022MIBZ-TR5421 datasheet(10/29 Pages) INTERSIL

Teilenummer	ISL12022MIBZ-TR5421

Bauteilbeschribung	Low Power RTC with Battery Backed SRAM, Integrated 5ppm

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Hersteller	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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ISL12022MR5421

10

FN7576.1

June 4, 2010

General Description

The ISL12022MR5421 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 ISL12022MR5421 can be

programmed for automatic Daylight Saving Time (DST)

adjustment by entering local DST information.

The ISL12022MR5421’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 ISL12022MR5421 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 PWR_VBAT registers.

The ISL12022MR5421 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

2040

6080

TEMPERATURE (°C)

FOUT = 32kHz

FOUT = 64Hz

FOUT = 1Hz

20

30

40

50

60

70

80

90

100

110

-40

-20

0

20

406080

TEMPERATURE (°C)

VDD = 1.8V

VBAT = 5.5V

VDD = 3.0V

40

50

60

70

80

90

100

110

-40

-20

0

2040

6080

TEMPERATURE (°C)

VDD = 2.7V

VBAT = 5.5V

VDD = 3.3V

-80

-60

-40

-20

0

20

40

60

80

-40

-20

0

20406080

TEMPERATURE (°C)

62.5ppm

32ppm

-31ppm

-61.5ppm

0ppm

ISL12022MR5421

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