Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving
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Overview
Description
The ISL12022MR5421 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 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. The ISL12022MR5421 has redesign package to increase Contact and Air Discharge ESD performance.
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
- I2C-Bus™
- RoHS Compliant
Comparison
Applications
Applications
- Utility Meters
- POS Equipment
- Printers and Copiers
- Digital Cameras
Documentation
= Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1.48 MB | |
| Product Change Notice | PDF 75 KB | |
| Application Note | PDF 303 KB | |
| Product Change Notice | PDF 117 KB | |
| Manual - Development Tools | PDF 815 KB | |
| Application Note | PDF 302 KB | |
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Design & Development
Software & Tools
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
ISL12022MIBZR5421 Active Samples Available |
SOICW | Tube | 1 | 4.821 | Get Samples, |
ISL12022MIBZ-TR5421 Active Samples Available |
SOICW | Reel | 1 | Get Samples, |
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