PCA85276ATT/AJ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-time clock/calendar with alarm and watchdog functionality
• Characteristics: Low power consumption, high accuracy, small package size
• Package: TSSOP-20
• Essence: Provides accurate timekeeping and alarm functions for various applications
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Supply Voltage: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Frequency: 32.768 kHz
• Timekeeping Accuracy: ±3 ppm at 25°C
• Alarm Output: Open-drain output
• Watchdog Timer: Programmable timeout period

Detailed Pin Configuration

The PCA85276ATT/AJ IC has a total of 20 pins arranged as follows:

1. VDD - Power supply voltage
2. GND - Ground
3. SDA - Serial data input/output
4. SCL - Serial clock input
5. INT - Interrupt output
6. WDI - Watchdog input
7. A0 - Address selection bit 0
8. A1 - Address selection bit 1
9. A2 - Address selection bit 2
10. RESET - Reset input
11. X1 - Crystal oscillator connection
12. X2 - Crystal oscillator connection
13. ALM0 - Alarm output 0
14. ALM1 - Alarm output 1
15. SQW - Square wave output
16. VBAT - Backup battery input
17. NC - No connection
18. NC - No connection
19. NC - No connection
20. NC - No connection

Functional Features

• Real-time clock/calendar with seconds, minutes, hours, day, date, month, and year information
• Alarm functionality with programmable alarm times and interrupt output
• Watchdog timer for system monitoring and reset
• I2C interface for communication with microcontrollers
• Power-saving features to minimize energy consumption

Advantages and Disadvantages

Advantages: - High accuracy timekeeping - Low power consumption - Small package size - Flexible alarm configuration - Wide operating voltage range

Disadvantages: - Limited number of alarm outputs - No built-in temperature compensation

Working Principles

The PCA85276ATT/AJ is based on a quartz crystal oscillator that provides a stable clock signal. It uses an internal counter to keep track of time and date information. The IC communicates with a microcontroller through the I2C interface, allowing the microcontroller to set and read time, configure alarms, and monitor the watchdog timer.

Detailed Application Field Plans

The PCA85276ATT/AJ is widely used in various applications that require accurate timekeeping and alarm functionality. Some common application fields include:

1. Consumer Electronics: Used in digital clocks, watches, and timers.
2. Automotive: Integrated into car dashboard displays and infotainment systems.
3. Industrial Automation: Utilized in programmable logic controllers (PLCs) and industrial control systems.
4. Medical Devices: Incorporated into medical equipment such as patient monitors and infusion pumps.
5. Internet of Things (IoT): Integrated into IoT devices for time synchronization and event scheduling.

Detailed and Complete Alternative Models

1. DS3231 - Real-time clock module with temperature compensation.
2. PCF8563 - Low-power real-time clock/calendar with I2C interface.
3. MCP7940N - Battery-backed real-time clock/calendar with SRAM and I2C interface.
4. DS1307 - Low-cost real-time clock module with I2C interface.

These alternative models offer similar functionality and can be considered as alternatives to the PCA85276ATT/AJ based on specific requirements and preferences.

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