ISL12022

Low Power RTC with Battery-Backed SRAM and Embedded Temp Comp ±5ppm with Auto Day Light Saving

OVERVIEW

The ISL12022 device is a low power real time clock with an embedded Temp sensor for oscillator compensation, clock/calendar, power fail, low battery monitor, brownout indicator, single periodic or polled alarms, intelligent battery-backup switching, Battery Reseal™ function 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.

Daylight Savings time adjustment is done automatically, using parameters entered by the user. Power fail and battery monitors offer user-selectable trip levels. A time stamp function records the time and date of switchover from VDD to VBAT power, and also from VBAT to VDD power.

KEY FEATURES

  • Real Time Clock/Calendar
  • Tracks Time in Hours, Minutes and Seconds
  • Day of the Week, Day, Month and Year
  • On-chip Oscillator Compensation Over the Operating Temperature Range
  • ±5ppm Over -40°C to +85°C
  • 10-bit Digital Temperature Sensor Output
  • ±2°C Accuracy
  • Customer Programmable Day Light Saving Time
  • 15 Selectable Frequency Outputs
  • 1 Alarm
  • Settable to the Second, Minute, Hour, Day of the Week, Day, or Month
  • Single Event or Pulse Interrupt Mode
  • Battery Reseal™ Function to Extend Battery Shelf Life
  • Automatic Backup to Battery or Super Capacitor
  • Operation to VBAT = 1.8V
  • 1.0µA Battery Supply Current
  • Battery Status Monitor
  • 2 User Programmable Levels
  • Seven Selectable Voltages for Each Level
  • Power Status Brownout Monitor
  • Six Selectable Trip Levels, from 2.295V to 4.675V
  • Oscillator Failure Detection
  • Time Stamp for First VDD to VBAT, and Last VBAT to VDD
  • 128 Bytes Battery-Backed User SRAM
  • I2C Bus™
  • 400kHz Clock Frequency
  • 1µA Typical Battery Current
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL12022
Basic Information
Production Status
量産中
電源電圧Vcc (V) (min)
2.7
電源電圧Vcc (V) (max)
5.5
VBAT (min)
1.8 V
VBAT (max)
5.5 V
IBAT (nA)
1000
精度
±5 ppm
アラーム
1
水晶周波数調整
Yes
選択可能周波数出力
15
CPU監視機能POR
No
CPU監視機能ウォッチドッグタイマ
No
バッテリシール
Yes
バッテリバックアップ
Yes
POR用VTRIP
6 Select VTRIP Levels
IRQ_Bar
IRQ_bar/FOUT
FOUT
IRQ_bar/FOUT
RESET_bar
No
オシレータ補償 (ppm)
-336 to +337
SRAM
128 Bytes
その他機能
Battery Switchover Time Stamp,
Battery Status Monitor, Brown-out Alarm, Daylight Savings
メモリタイプ
RAM
バス/出力インタフェース
I2C
タイムキーピング電流
3.5 µA
IRQピン
Yes
周波数OUTピン
Yes
タイマ
No
タンパ検出
No
リセット
No
認定レベル
Standard
バッテリ電圧範囲 (V)
1.8 to 5.5
電源電圧Vcc範囲 (V)
2.7 to 5.5
CANサンプル
YES
温度範囲
-40 to +85

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