Interface:	Parallel
Base Part Number:	BQ4285
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Current - Timekeeping (Max):	--
Voltage - Supply, Battery:	2.5 V ~ 4 V
Voltage - Supply:	4.5 V ~ 5.5 V
Series:	--
Date Format:	YY-MM-DD-dd
Time Format:	HH:MM:SS (12/24 hr)
Memory Size:	114B
Features:	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Type:	Clock/Calendar
Part Status:	Obsolete
Packaging:	Tube

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Real Time Clocks - BQ4285S-SB2G4 Application Field and Working Principle

Real time clocks (RTCs) are specialized hardware that provide an accurate and reliable timekeeping service. The BQ4285S-SB2G4 is a real time clock module that is widely used in industrial and consumer applications. This paper will discuss the application field and working principle of the BQ4285S-SB2G4.

Application

The BQ4285S-SB2G4 real time clock module is used in a variety of applications, including industrial and consumer electronics. Industrially, it can be used in machine automation systems, such as those responsible for controlling industrial machinery and processes. The real time clock also has application in consumer electronics, such as digital cameras, smartphones, and other devices that require accurate and reliable timekeeping.

Features

The BQ4285S-SB2G4 is a highly accurate and reliable RTC that runs off of a 32.768 kHz external crystal. The module is equipped with two binary coded decimal (BCD) coded outputs from its serial bus, along with an integrator capable of continuous operation for up to 16 hours. The BQ4285S-SB2G4 also has an integrated high-accuracy temperature-compensated crystal oscillator (TCXO), providing accuracy of up to +/- 2 ppm. Additionally, the module is equipped with a low-battery detection circuit to detect a low-battery condition, as well as high-voltage input protection.

Design

The BQ4285S-SB2G4 consists of an oscillator circuit, a control logic, and a battery management circuit, all running on a 5V power source. The oscillator circuit is designed with a 32.768 KHz crystal, with the accuracy of the oscillator dependent on the quality of the crystal. The oscillator is then connected to the control logic, which is responsible for the timekeeping and any calculations necessary for the clock\'s functioning. The battery management circuit is responsible for monitoring the battery voltage and providing an indication when the battery is low on power.

Working Principle

The working principle of the BQ4285S-SB2G4 is similar to that of any other real time clock. The oscillator circuit uses the connected crystal to generate a signal at the set frequency. This signal is then fed into the control logic, which is responsible for analyzing the signal, calculating any necessary values, and providing outputs as requested. The values are stored in the integrated non-volatile memory for future use. The battery management circuit is used to monitor the battery voltage and provide a low-battery indication should the voltage fall below a certain threshold.

Conclusion

The BQ4285S-SB2G4 real time clock module is a highly accurate and reliable RTC that is used in both industrial and consumer applications. It has a number of features, such as a 32.768 kHz external crystal, a high-accuracy temperature-compensated crystal oscillator (TCXO), and a low-battery detection circuit. The clock is composed of an oscillator circuit, a control logic, and a battery management circuit, all running on a 5V power source. The working principle of the BQ4285S-SB2G4 is similar to that of any other real time clock, using the oscillator circuit to generate a signal, then the control logic to analyze, calculate, and provide outputs as requested.

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