Features
- Embedded 32.768kHz quartz crystal in the package
- 20 Ld SOIC package (for the DFN version, see 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 maximum battery current
- I2C Bus
- RoHS compliant
Description
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. The 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 the switchover from VDD to VBAT power, and also from VBAT to VDD power.
Parameters
| Attributes | Value |
|---|---|
| Interface | I2C |
| Alarms (#) | 1 |
| Supply Voltage Vcc (Min) (V) | 2.7 |
| Battery Backup | Yes |
| Battery Seal | Yes |
| CPU Supervisory Function POR | No |
| Crystal Frequency Trimming | Yes |
| Frequency Out Pin | Yes |
| Battery Current (nA) | 1000 |
| Time Keeping Current (µA) | 3.5 |
| SRAM | 128 Bytes |
| Selectable Frequency Output | 15 |
| Oscillator Compensation | -336 to +337 |
| TRIP Voltage for POR | 6 Select VTRIP Levels |
| Accuracy | ±5 ppm |
| Product Category | Real-Time Clocks, Real-Time Clocks |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SOICW | 12.8 x 7.5 x 2.21 | 20 | 1.3 |
Applications
- Utility meters
- POS equipment
- Printers and copiers
- Digital cameras
Renesas Boards & Kits
ISL120x Real Time Clock USB Evaluation System
This evaluation system is a hardware and software platform for testing Renesas real-time clock (RTC) devices; the system requires only a PC for the controller and power functions. Renesas offers a large portfolio of RTC devices with features including a crystal oscillator, clock and date... Read More
Low Power RTC with Battery Backed SRAM and Temperature Compensation Development Board
The QCIOT-RTC22MPOCZ board features the low-power ISL12022M Real-Time Clock (RTC) devices with an embedded temperature sensor and 32.768kHz quartz crystal. The built-in automatic switchover to battery backup for power failure draws only 1.6μA, extending battery life while providing continuous... Read More
Knowledge Base
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ISL12022M POR Threshold Voltage
The POR threshold voltage in the ISL12022M device is 1.0 volts. Once the threshold is triggered by VDD rising, it will take about 13 milliseconds for the logic in the device to load all the registers.
Feb 27, 2024 -
How do I program the ISL12022, ISL12022M and ISL12020M RTCs?
Question: How do I program the ISL12022, ISL12022M and ISL12020M RTCs? Answer: ISL12022/22M/20M Registers Setup Example I. RTC REGISTERS A. Example: Set time to 11:03:28PM, TUESDAY, MARCH 3, 2009 1. Set WRTC bit in INT register Bus Activity Description Send START Send DEh Slave ...
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