Low Power RTC with Battery Backed SRAM and 50/60 Cycle AC Input and Crystal Back-up
The ISL12032 device is a low power real time clock with 50/60 AC input for timing synchronization. It also has an oscillator utilizing an external crystal for timing back-up, clock/calendar registers, intelligent battery back-up switching, battery voltage monitor, brownout indicator, integrated trickle charger for super capacitor, single periodic or polled alarms, POR supervisory function, and up to 4 Event Detect with time stamp. There are 128 bytes of battery-backed user SRAM.
Features
• 50/60 Cycle AC as a Primary Clock Input for RTC Timing
• Redundant Crystal Clock Input Selectable by User
- Dynamically Switch from AC Clock Input to Crystal in Case of Power Failure
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes, Seconds and Tenths of a Second
- Day of the Week, Day, Month, and Year
• Auto Daylight Saving Time Correction
- Programmable Forward and Backward Dates
• Security and Event Functions
- Event Detection with Time Stamp
- Stores First and Last Three Event Time Stamps
• Separate FOUT Pin
- 7 Selectable Frequency Outputs
• Dual Alarms with Hardware and Register Indicators
- Hardware Single Event or Pulse Interrupt Mode
• Automatic Backup to Battery or Super Capacitor
- VBAT Operation Down to 1.8V
- 1.0µA Battery Supply Current
• Two Battery Status Monitors with Selectable Levels
- Seven Selectable Voltages for Each Level
- 1st Level, Trip Points from 4.675V to 2.125V
- 2nd Level, Trip Points from 4.125V to 1.875V
• VDD Power Brownout Monitor
- Six Selectable Trip Levels, from 4.675V to 2.295V
• Time Stamp during Power-to-Battery and Battery-to-Power Switchover
• Integrated Trickle Charger
- Four Selectable Charging Rates
• 128 Bytes Battery-Backed User SRAM
• I2C Interface
- 400kHz Data Transfer Rate
• Pb-free (RoHS compliant)
Applications
• Utility Meters
• Control Applications
• Security Related Applications
• Vending Machines
• White Goods
• Consumer Electronics
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