PCF8523AUG/HAV

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-Time Clock (RTC) and Calendar
• Characteristics: Low power consumption, high accuracy, I2C interface
• Package: 8-pin SOIC (Small Outline Integrated Circuit)
• Essence: Provides accurate timekeeping and calendar functions for electronic devices
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Supply Voltage: 1.8V to 5.5V
• Timekeeping Accuracy: ±3 minutes per year at 25°C
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Frequency: Up to 400 kHz
• Battery Backup Voltage: 1.0V to 5.5V
• Clock Output Frequency: Programmable from 32.768 kHz to 1 Hz

Pin Configuration

The PCF8523AUG/HAV has the following pin configuration:

1. VBAT - Battery backup supply voltage
2. GND - Ground
3. SDA - Serial Data Line (I2C bus)
4. SCL - Serial Clock Line (I2C bus)
5. SQW/INT - Square Wave Output / Interrupt output
6. VDD - Supply voltage
7. X1 - Crystal oscillator input
8. X2 - Crystal oscillator output

Functional Features

• Real-time clock with date and timekeeping functions
• Alarm and timer functions
• Battery backup support for uninterrupted operation
• Programmable square wave output
• Interrupt output for triggering events
• Automatic leap year compensation
• Power-on reset and low battery detection

Advantages and Disadvantages

Advantages: - Low power consumption extends battery life - High accuracy ensures precise timekeeping - I2C interface allows easy integration with microcontrollers - Battery backup support ensures uninterrupted operation

Disadvantages: - Limited clock output frequency range - Requires an external crystal oscillator for accurate timekeeping

Working Principles

The PCF8523AUG/HAV is based on a CMOS technology and utilizes an internal oscillator circuit along with an external crystal oscillator to provide accurate timekeeping. It communicates with the host microcontroller through the I2C bus, allowing the microcontroller to read and write data to control the RTC functions.

The IC operates in two modes: active mode and low-power mode. In active mode, it performs timekeeping, alarm, and timer functions. In low-power mode, it reduces power consumption by disabling unnecessary circuitry while still maintaining accurate timekeeping using the battery backup.

Detailed Application Field Plans

The PCF8523AUG/HAV is widely used in various electronic devices that require real-time clock and calendar functionality. Some common application fields include:

1. Consumer Electronics: Used in digital cameras, portable media players, and smartwatches to provide accurate timekeeping and scheduling features.
2. Automotive: Integrated into car infotainment systems, dashboard displays, and navigation systems for time synchronization and event triggering.
3. Industrial Automation: Incorporated into industrial control systems, programmable logic controllers (PLCs), and data loggers for time-stamping and scheduling tasks.
4. Medical Devices: Utilized in medical equipment such as patient monitors, infusion pumps, and diagnostic devices to maintain accurate time records and synchronize operations.
5. Home Automation: Integrated into smart home systems for scheduling events, controlling appliances, and managing energy consumption.

Detailed and Complete Alternative Models

1. DS3231 - Real-Time Clock Module with I2C Interface
2. MCP7940N - I2C Real-Time Clock/Calendar with SRAM
3. DS1307 - Low-Power Real-Time Clock Module with I2C Interface
4. DS1337 - Serial Real-Time Clock Module with I2C Interface
5. PCF8563 - Real-Time Clock/Calendar with I2C Interface

These alternative models offer similar functionality and can be considered as alternatives to the PCF8523AUG/HAV based on specific requirements and availability.

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