BQ3285ESTR

Product Overview

Category

BQ3285ESTR belongs to the category of real-time clock (RTC) ICs.

Use

This product is primarily used for timekeeping and calendar functions in electronic devices.

Characteristics

• Low power consumption
• High accuracy
• Integrated crystal oscillator
• Non-volatile memory for data storage
• I2C interface for communication

Package

BQ3285ESTR is available in a small surface-mount package, typically measuring 8mm x 6mm.

Essence

The essence of BQ3285ESTR lies in its ability to provide accurate timekeeping and calendar functionality with minimal power consumption.

Packaging/Quantity

This product is usually packaged in reels or tubes, containing a specific quantity of ICs per package. The exact quantity may vary depending on the supplier.

Specifications

• Supply voltage: 1.8V - 5.5V
• Timekeeping accuracy: ±2 minutes per month
• Operating temperature range: -40°C to +85°C
• Data retention: Over 10 years
• I2C bus frequency: Up to 400kHz

Detailed Pin Configuration

The BQ3285ESTR IC has the following pin configuration:

1. VCC - Power supply input
2. GND - Ground connection
3. SDA - Serial data line for I2C communication
4. SCL - Serial clock line for I2C communication
5. X1 - Crystal oscillator input
6. X2 - Crystal oscillator output
7. VBAT - Backup battery input
8. RST - Reset input

Functional Features

• Real-time clock with calendar functions
• Automatic leap year compensation
• Alarm functionality with programmable interrupt
• Battery backup for continuous timekeeping during power loss
• Power management features to minimize power consumption

Advantages and Disadvantages

Advantages

• High accuracy timekeeping
• Low power consumption
• Integrated crystal oscillator simplifies design
• Non-volatile memory ensures data retention
• I2C interface allows easy integration with microcontrollers

Disadvantages

• Limited temperature range for operation (-40°C to +85°C)
• Relatively small package size may require careful handling during assembly

Working Principles

BQ3285ESTR utilizes a crystal oscillator to generate clock signals, which are used for timekeeping and calendar functions. The IC communicates with the host device through the I2C interface, allowing for easy configuration and data exchange. In case of a power loss, the backup battery ensures continuous timekeeping and data retention.

Detailed Application Field Plans

BQ3285ESTR finds applications in various electronic devices that require accurate timekeeping and calendar functionality. Some potential application fields include:

1. Consumer electronics: Smartphones, tablets, digital cameras
2. Automotive: Car infotainment systems, dashboard clocks
3. Industrial equipment: Data loggers, measurement instruments
4. Medical devices: Patient monitoring systems, medical equipment
5. Home automation: Smart thermostats, security systems

Detailed and Complete Alternative Models

1. DS3231 - Real-time clock module with higher accuracy and extended temperature range.
2. PCF8563 - Low-power real-time clock IC with integrated temperature compensation.
3. MCP7940N - Real-time clock IC with battery switchover and alarm features.

These alternative models offer similar functionalities to BQ3285ESTR and can be considered based on specific requirements and preferences.

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