BQ4845S-A4G4

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The BQ4845S-A4G4 is a Real Time Clock (RTC) device, a non-volatile counter that can measure time in seconds and store them in registers, which are separate from the main system memory. This makes the device ideal for tracking time even when other tasks are running in the system. It is designed to operate in a wide variety of application fields, and has several key features and operating principles that make it a versatile and reliable time keeping solution.The BQ4845S-A4G4 has an operating voltage of 1.2V to 3.6V, making it suitable for both low- and high-voltage application fields. It has an integrated lithium-thionyl chloride (Li/FeSOCl2) rechargeable battery that provides power to the device in case of a power failure or if the main system needs to go offline. This battery has a guaranteed operating life of 10 years, providing ample protection for the data stored in the device.The RTC also has several integrated features which make it a robust and reliable time keeping solution. It has a built-in 32KHz quartz crystal oscillator, giving it an accuracy of ±15ppm. This accuracy can be further improved by connecting an external crystal stabilizer. The device also has an auto-calibration system which compensates for any frequency drift or temperature variations. The BQ4845S-A4G4 also has an alarm interrupt feature which is triggered when either an alarm flag is set or an alarm threshold is exceeded. When an alarm flag is set, an interrupt is generated, allowing the system to respond accordingly. The alarm threshold can be programmed by software in order to meet the requirements of the application field. The device also has a programmable calendar alarm, where the alarm is triggered on certain dates or days of the week. This allows the device to be used in applications requiring periodic reminders or scheduled activities.In addition to all these features, the BQ4845S-A4G4 has a built-in temperature sensor that measures the temperature of the device in order to compensate for its frequency drift. It also has a special power down mode that conserves battery power, and a watchdog timer that can be used to prevent system hangs by periodically resetting the system. The total power consumption of the device is very low, making it suitable for battery operated applications. It is designed to operate over a wide temperature range of -40 °C to +85 °C. The device is available in a 24-pin hermetic TSSOP package, making it ideal for high-reliability applications.In conclusion, the BQ4845S-A4G4 is a robust and reliable Real Time Clock device for a variety of application fields. It has several integrated features such as an integrated lithium-thionyl chloride rechargeable battery, an auto-calibration system, an alarm interrupt, a programmable calendar alarm and a built-in temperature sensor, which makes it suitable for a range of applications. It is available in a 24-pin hermetic TSSOP package, and has an operating voltage of 1.2V to 3.6V, making it a versatile and reliable time keeping solution.}

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