BQ3285LFSS-A1TR

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The BQ3285LFSS-A1TR is a low-power real-time clock (RTC) designed and developed by Texas Instruments. It is a highly accurate and cost-effective embedded system clock with multiple features designed to provide embedded systems with reliable timekeeping capabilities and system power management.

Application field

This Real-Time Clock is widely used in embedded systems such as automotive, industrial, medical and consumer applications.

Automotive applications range from powertrain and body, climate control, and vehicle electronics. It supports all major car manufacturers, V2X communications and access, fleet management, digital dashboards, and other systems.

The BQ3285LFSS-A1TR is also used in industrial and process control applications for secure monitoring and control of machines, motors and other control elements. It is also beneficial for water conservation, HVAC, and other industrial processes.

It is also used in medical applications such as medical monitoring systems and medical equipment. The Real-Time Clock can reduce power consumption and improve accuracy in medical devices.

The BQ3285LFSS-A1TR is also used in consumer applications such as smartphones, smart watches, tablets, and other consumer electronic devices. The small form factor and low-power consumption is beneficial for consumer applications.

Working principle

The BQ3285LFSS-A1TR uses a 3.2V to 3.6V backup power supply. It operates from a low power-consumption standby mode at 500nA and from a deep sleep mode at 10nA. This Real-Time Clock includes an integrated oscillator that uses a 2-pin capacitor for constant frequency accuracy over a wide temperature range. It has an alarm feature for periodic wake-up signals. The Real-Time Clock also includes an automatic temperature compensation feature to maintain accuracy over a wide temperature range.

The BQ3285LFSS-A1TR has an alarm feature with multiple alarms and interrupt sources to generate an interrupt signal. The alarm can be used for periodic wake-up signals or to generate an alert when time and or calendar values are programmed. This Real-Time Clock can be programmed with RAM or I2C and includes optional battery-backed RAM.

The BQ3285LFSS-A1TR includes an integrated battery charger for use with multiple configurations such as lithium primary, lithium-ion rechargeable, or alkaline batteries. The charger includes charge current and voltage regulation and a discharged battery monitor. The charger also includes a charger state monitor and power-on reset function.

The BQ3285LFSS-A1TR has a very accurate timekeeping feature with a built-in 32-kHz crystal oscillator and an external timing circuit with up to ±2 PPM accuracy. The external timing circuit uses a capacitor-based oscillator circuit to compensate for drift and temperature. The Real-Time Clock is also capable of setting alarms, programming RAM, and storing time and date information over a wide temperature range.

Conclusion

The BQ3285LFSS-A1TR is a low-power real-time clock that is suitable for a range of embedded systems applications such as automotive, industrial, medical, and consumer. It supports automatic temperature compensation, multiple alarms for periodic wake-up signals, an integrated battery charger, and an external timing circuit with up to ±2 PPM accuracy. This Real-Time Clock is an excellent choice for reliable and highly accurate timekeeping in embedded systems.

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