ISL12022M

Low Power RTC Module with Battery Backed SRAM, Integrated ±5ppm Temperature Sensor and Crystal

OVERVIEW

The ISL12022M 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. Backup battery current draw is less than 1.6µA over the temperature range. The device is offered in a 20 Ld SOIC module that contains the RTC and an embedded 32.768kHz quartz crystal. The calibrated oscillator provides less than ±5ppm drift over the full -40°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 SOIC Package (for DFN version, refer to the ISL12020M)
  • 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
  • 1.6µA Max Battery Current
  • I2C-Bus™
  • RoHS Compliant

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL12022M
Production Status
Mass Production
Supply Voltage Vcc (Min) (V)
2.7
Supply Voltage Vcc (Max) (V)
5.5
VBAT (min)
1.8 V
VBAT (max)
5.5 V
IBAT (nA)
1000
Accuracy
±5 ppm
Alarms
1
Crystal Frequency Trimming
Yes
Selectable Frequency Output
15
CPU Supervisory Function POR
No
CPU Supervisory Function Watchdog Timer
No
Battery Seal
Yes
Battery Backup
Yes
VTRIP for POR
6 Select VTRIP Levels
IRQ_Bar
IRQ_bar/FOUT
FOUT
IRQ_bar/FOUT
RESET_bar
No
Oscillator Compensation (ppm)
-336 to +337
SRAM
128 Bytes
Other Functions
Battery Switchover Time Stamp,
Battery Status Monitor, Brown-out Alarm, Daylight Savings
Memory Type
RAM
Bus/Output Interface
I2C
Time Keeping Current
3.5 µA
IRQ Pin
Yes
Freq. Out Pin
Yes
Timer
No
Tamper Detect
No
Reset
No
Qualification Level
Standard
Battery Voltage Range (V)
1.8 to 5.5
Supply Voltage Vcc Range (V)
2.7 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

Confirm below disclaimers

Input Renesas account name and password