ISL1219IUZ-T datasheet(7/24 Pages) INTERSIL

tên linh kiện	ISL1219IUZ-T

Giải thích chi tiết về linh kiện	Low Power RTC with Battery Backed SRAM and Event Detection

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7

FN6314.1

August 14, 2006

General Description

The ISL1219 device is a low power Real Time Clock with

Security and Event function, Time Stamp in both normal and

battery modes, timing and crystal compensation,

clock/calendar, power fail indicator, periodic or polled alarm,

intelligent battery backup switching, and battery-backed user

SRAM.

The Event Detection function can be used for tamper

detection, security or other chassis or generic system

monitoring. Upon a valid event detection, the ISL1219 sets

the Event Detection bit (EVT bit) in the status register, stores

time stamp information on on board memory, and, can

optionally: 1) Issue an Event Output signal (EVDET pin), 2)

At the time the event occurred, stop the RTC registers from

advancing. The event monitor and time stamp functions in

both main VDD and battery back up modes. The event

monitor can also be configured for various input detection

rates to optimize power consumption for the application. In

addition, the Event Monitor pin (EVIN) has a selectable glitch

filter to avoid switch de-bouncing.

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.

The ISL1219'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 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

SuperCap with automatic switchover from VDD to VBAT. The

entire ISL1219 device is fully operational from 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).

Pin Description

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 ISL1219 to supply a timebase for the real

time clock. Internal compensation circuitry provides high

accuracy over the operating temperature range from

-40°C to +85°C. This oscillator compensation network can

be used to calibrate the crystal timing accuracy over

temperature either during manufacturing or with an external

temperature sensor and microcontroller for active

compensation. The device can also be driven directly from a

32.768kHz source at pin X1.

FIGURE 7. EVIN IPULL-UP vs VDD

FIGURE 8. IPULL-UP vs TEMPERATURE AT VBAT = 1.8V

Typical Performance Curves Temperature is +25°C unless otherwise specified (Continued)

0.00E+00

1.00E-06

2.00E-06

3.00E-06

4.00E-06

5.00E-06

6.00E-06

7.00E-06

8.00E-06

2.533.544.555.5

6

VDD

-40°C

+25°C

+85°C

1.0E-07

2.0E-07

3.0E-07

4.0E-07

5.0E-07

-40

-25

-10

5

20

35

50

65

80

Temperature

FIGURE 9. STANDARD OUTPUT LOAD FOR TESTING THE

DEVICE WITH VDD = 5.0V

SDA

AND

IRQ/FOUT

1533

Ω

100pF

5.0V

FOR VOL= 0.4V

AND IOL = 3mA

EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V

ISL1219

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