Interface:	I²C, 2-Wire Serial
Base Part Number:	ISL1208
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Current - Timekeeping (Max):	4µA ~ 6µA @ 3V ~ 5V
Voltage - Supply, Battery:	1.8 V ~ 5.5 V
Voltage - Supply:	2.7 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	2B
Features:	Alarm, Leap Year, SRAM
Type:	Clock/Calendar
Part Status:	Obsolete
Packaging:	Tube

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ISL1208IB8 Application Field and Working Principle

The ISL1208IB8 is a Real Time Clock (RTC) module released by Intersil, a wholly owned subsidiary of Renesas Electronics Corp. It is a low-power, µP-compatible device that allows microcontrollers (µCs) to keep track of and realize precise timekeeping for the duration of system operations. It integrates a temperature-compensated crystal oscillator (TCXO), crystal, oscillator trim components, a clock output, and a power detection pin in a small package, providing a complete and reliable clock module solution.

Application Field

Due to its low power consumption, small package size, precise output, and high accuracy, the ISL1208IB8 RTC is suitable for a broad range of applications, including industrial, medical, consumer, wearable, and automotive applications. This is because it keeps precise time even when power is interrupted.As an added benefit, the ISL1208IB8 is also highly capable of power supply interrupts, which allows it to continue to keep accurate time even when the main power supply is interrupted.Some common applications of the ISL1208IB8 RTC include equipment control systems, security systems, home and industrial automation, consumer products, and many more.

Working Principle

The ISL1208IB8 RTC is based on the I2C communication protocol, which is an open source protocol that allows two devices to communicate over a serial bus. It utilizes a two-wire serial bus, I2C clock and I2C data, to provide a reliable interface for MCUs to communicate on.The ISL1208IB8 also uses an issued coin cell battery to provide power backup for its operation. It stores all of the clock data in EEPROM memory, including the date, time, leap year status, and alarm values, so it can continue to function accurately when the power supply is interrupted.The ISL1208IB8 supports two different modes of operation, a high-sensitivity sleep mode that offers low power operation and a power-saving standby mode. Whenever the power supply is lost, the ISL1208IB8 automatically switches to the sleep mode, allowing it to operate in low-power standby mode and make minimal power consumption.In addition, the ISL1208IB8 also supports an intelligent sensing circuit that monitors AC line voltage conditions. This classifies the module’s operational status as either normal or failure and makes it easy to sense power supply interrupts.

Conclusion

The ISL1208IB8 is a Real Time Clock (RTC) module designed by Intersil. It is a low-power and µP-compatible device that allows microcontrollers (µCs) to keep track of and realize precise timekeeping for the duration of system operations. It is suitable for a broad range of applications, including industrial, medical, consumer, wearable, and automotive applications and has many uses, from equipment control systems and security systems to home and industrial automation, consumer products, and more. Its working principle is based on the I2C communication protocol and it is also capable of power supply interrupts and low-power operation.

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