BQ4845S-A4NG4

Product Overview

Category

The BQ4845S-A4NG4 belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used as a real-time clock (RTC) in various electronic devices.

Characteristics

• Low power consumption
• High accuracy timekeeping
• Non-volatile memory for data storage
• I2C interface for easy integration
• Wide operating voltage range

Package

The BQ4845S-A4NG4 is available in a small surface mount package, making it suitable for compact electronic devices.

Essence

The essence of the BQ4845S-A4NG4 lies in its ability to accurately keep track of time and provide reliable timekeeping functionality to electronic devices.

Packaging/Quantity

This IC is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

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 BQ4845S-A4NG4 has a total of 16 pins, each serving a specific function. The pin configuration is as follows:

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. IRQ - Interrupt request output
6. X1 - Crystal oscillator input
7. X2 - Crystal oscillator output
8. VBAT - Backup battery input
9. VBATGND - Backup battery ground connection
10. AD0 - Address select input 0
11. AD1 - Address select input 1
12. AD2 - Address select input 2
13. AD3 - Address select input 3
14. AD4 - Address select input 4
15. AD5 - Address select input 5
16. AD6 - Address select input 6

Functional Features

• Real-time clock with calendar functionality
• Alarm and timer functions
• Automatic leap year compensation
• Power-fail detection and switch circuitry
• Battery backup for timekeeping during power loss
• Programmable square wave output

Advantages and Disadvantages

Advantages

• High accuracy timekeeping
• Low power consumption
• Wide operating voltage range
• Easy integration with I2C interface
• Long data retention period

Disadvantages

• Relatively limited address select options
• Requires an external crystal oscillator for timekeeping

Working Principles

The BQ4845S-A4NG4 utilizes a combination of internal registers, counters, and a crystal oscillator to accurately keep track of time. It operates by continuously updating the time and date information based on the crystal oscillator's frequency. The IC also incorporates power-fail detection circuitry to switch seamlessly between the main power supply and backup battery during power loss.

Detailed Application Field Plans

The BQ4845S-A4NG4 finds applications in various electronic devices that require accurate timekeeping. Some common application fields include:

1. Consumer Electronics: Digital clocks, watches, and timers.
2. Automotive: Dashboard clocks, car audio systems, and navigation devices.
3. Industrial Automation: Programmable logic controllers (PLCs), data loggers, and industrial timers.
4. Medical Devices: Patient monitoring systems, infusion pumps, and medical timers.
5. Communication Systems: Network switches, routers, and telecommunication equipment.

Detailed and Complete Alternative Models

1. DS1307 - Real-time clock IC with I2C interface.
2. PCF8563 - Low power real-time clock module with alarm functionality.
3. MCP7940N - I2C real-time clock/calendar with battery backup.
4. DS3231 - Highly accurate RTC module with temperature compensation.
5. RV-8803-C7 - Ultra-low power RTC module with I2C interface.

(Note: This list is not exhaustive and there are several other alternative models available in the market.)

In conclusion, the BQ4845S-A4NG4 is a versatile real-time clock IC that offers high accuracy timekeeping, low power consumption, and easy integration. Its wide range of applications and availability of alternative models make it a popular choice for various electronic devices requiring reliable timekeeping functionality.