ISL12020CBZ datasheet(7/25 Pages) INTERSIL

Numer części	ISL12020CBZ

Szczegółowy opis	Low Power RTC with VDD Battery Backed SRAM and Embedded Temp Compensation 짹5ppm with Auto Day Light Saving

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Producent	INTERSIL [Intersil Corporation]

Strona internetowa	http://www.intersil.com/cda/home

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7

FN6450.0

March 29, 2007

General Description

The ISL12020 devices are low power real time clocks

(RTCs) with embedded temperature sensors. They contain

crystal frequency compensation circuitry over the operating

temperature range, clock/calendar, power fail and low

battery monitors, brown out indicator with separate

(LVRSET) reset pin (ISL12021 only), 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, both the ISL12020 could be

programmed for automatic Daylight Saving Time (DST)

adjustment by entering local DST information.

The ISL1202x’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 Super

Cap with automatic switchover from VDD to VBAT. The

ISL12020 devices are 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 ISL12020 offers a “Brown Out” alarm once the VDD

falls below a pre-selected trip level. In the ISL12020, 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 brown out alarm.

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 22 for recommended crystal). ISL12020

allows the user to input via I2C serial bus the temperature

variation profile of crystals not listed in the “Application

Section” on page 22. This oscillator compensation network

can also be used to calibrate the initial crystal timing

accuracy at room temperature. The device can also be

driven directly from a 32.768kHz source at pin X1.

VBAT

This input provides a backup supply voltage to the device.

VBAT supplies power to the device in the event that the VDD

supply fails. This pin can be connected to a battery, a Super

Capacitor or tied to ground if not used. See the Battery

Monitor parameter in the DC Operating Characteristics-RTC

on page 3.

IRQ/FOUT (Interrupt Output/Frequency Output)

This dual function pin can be used as an interrupt or

frequency output pin. The IRQ/FOUT mode is selected via

the frequency out control bits of the control/status register.

• Interrupt Mode. The pin provides an interrupt signal

output. This signal notifies a host processor that an alarm

has occurred and requests action. It is an open drain

active low output.

• Frequency Output Mode. The pin outputs a clock signal

which is related to the crystal frequency. The frequency

output is user selectable and enabled via the I2C bus. It is

an open drain output.

Serial Clock (SCL)

The SCL input is used to clock all serial data into and out of

the device. The input buffer on this pin is always active (not

gated). It is disabled when the backup power supply on the

VBAT pin is activated to minimize power consumption.

FIGURE 1. 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

FIGURE 2. RECOMMENDED CRYSTAL CONNECTION

X1

X2

ISL12020

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