ISL12020M

Real Time Clock with Embedded Crystal, ±5ppm Accuracy

Product Status: 量産中

OVERVIEW

Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving ISL12020M The ISL12020M device is a low power Real Time Clock (RTC) with an embedded temperature sensor and crystal. Device 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.

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.

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 function records the time and date of switchover from VDD to VBAT power and also from VBAT to VDD power.

KEY FEATURES

  • Embedded 32.768kHz quartz crystal in the package
  • 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
  • VDD and battery status monitors
  • Battery Reseal™ function to extend battery shelf life
  • Power status brownout monitor
  • Time stamp for battery switchover
  • 128 Bytes battery-backed user SRAM
  • I2C-Bus™
  • RoHS compliant

PARAMETRICS

Parameters
ISL12020M
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

ブロック図

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