ISL12022

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

Product Status: Mass Production

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)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL12022
Basic Information
生产状态
Mass Production
供电电压Vcc (最小值) (V)
2.7
供电电压Vcc (最大值) (V)
5.5
VBAT (最小值)
1.8 V
VBAT (最大值)
5.5 V
IBAT (nA)
1000
精度
±5 ppm
警报
1
晶体频率微调
Yes
可选频率输出
15
CPU监控功能POR
No
CPU监控功能看门狗定时器
No
电池密封
Yes
备用电池
Yes
POR的VTRIP
6 Select VTRIP Levels
IRQ_Bar
IRQ_bar/FOUT
FOUT
IRQ_bar/FOUT
RESET_bar
No
振荡器补偿 (ppm)
-336 to +337
SRAM
128 Bytes
其他功能
Battery Switchover Time Stamp,
Battery Status Monitor, Brown-out Alarm, Daylight Savings
内存类型
RAM
总线/输出接口
I2C
守时电流
3.5 µA
IRQ引脚
Yes
频率输出引脚
Yes
定时器
No
篡改检测
No
复位
No
资质级别
Standard
电池电压范围 (V)
1.8 to 5.5
供电电压Vcc范围 (V)
2.7 to 5.5
CAN 采样
YES
温度范围
-40 to +85

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