Datasheet > ISL12020M

ISL12020M

更新时间： 2023-12-20 18:44:43

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瑞萨 - RENESAS		/
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描述
Real Time Clock with Embedded Crystal, ±5ppm Accuracy

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ISL12020M 数据手册

DATASHEET

ISL12020M

FN6667

Rev 6.00

January 9, 2015

Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature

Compensation and Auto Daylight Saving

The ISL12020M device is a low power Real Time Clock (RTC)

Features

with an embedded temperature sensor and crystal. Device

• Embedded 32.768kHz quartz crystal in the package

functions include oscillator compensation, clock/calendar,

power fail and low battery monitors, brownout indicator,

one-time, periodic or polled alarms, intelligent battery backup

switching, Battery Reseal™ function and 128 bytes of

battery-backed user SRAM. The device is offered in a

20 Ld DFN module that contains the RTC and an embedded

32.768kHz quartz crystal. The calibrated oscillator provides

less than ±5ppm drift across the 0°C to +85°C temperature

range.

• 20 Ld DFN package (for SOIC version, refer to the

ISL12022M)

• Calendar

• On-chip oscillator temperature compensation

• 10-bit digital temperature sensor output

• 15 selectable frequency outputs

• Interrupt for alarm or 15 selectable frequency outputs

• Automatic backup to battery or supercapacitor

The RTC tracks time with separate registers for hours, minutes

and seconds. The calendar registers track date, month, year

and day of the week and are accurate through 2099, with

automatic leap year correction.

• V and battery status monitors

• Battery Reseal™ function to extend battery shelf life

• Power status brownout monitor

Daylight Savings time adjustment is done automatically, using

parameters entered by the user. Power fail and battery

monitors offer user-selectable trip levels. The time stamp

• Time stamp for battery switchover

function records the time and date of switchover from V to

• 128 Bytes battery-backed user SRAM

power and also from V

BAT

to V power.

BAT

• I C-Bus™

• RoHS compliant

Related Literature

• AN1549, “Addressing Power Issues in Real Time Clock

Applications”

Applications

• Utility meters

• AN1389, “Using Intersil’s High Accuracy Real Time Clock

Module”

• POS equipment

• Printers and copiers

• Digital cameras

X1 20

X1 19

X1 18

X1 17

3.3V

C₁

X1 16

SCHOTTKY DIODE

BAT54

V_BAT

GND

NC 15

R₂

R₃

R₁

0.1µF

V_DD14

IRQ/F_OUT13

SCL 12

SDA 11

10k 10k 10k

BATTERY

3.0V

C₂

0.1µF

VDD

SCL

MCU

INTERFACE

10 NC

SDA

GND

ISL12020M

IRQ/F_OUT

FIGURE 1. TYPICAL APPLICATION CIRCUIT

FN6667 Rev 6.00

January 9, 2015

Page 1 of 34

12 3 4 5 6 7...34

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