RX8900CE:UB3

Product Overview

• Category: Integrated Circuit (IC)
• Use: Real-time clock (RTC) module
• Characteristics: High precision, low power consumption, compact size
• Package: Surface Mount Technology (SMT)
• Essence: Provides accurate timekeeping functionality for various electronic devices
• Packaging/Quantity: Available in tape and reel packaging, quantity depends on customer requirements

Specifications

• Supply Voltage: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Accuracy: ±2ppm (at 25°C)
• Timekeeping Current: 0.35μA (typical)
• Alarm Function: Programmable alarms with interrupt capability
• I2C Interface: Supports I2C bus communication protocol
• Memory: Built-in 64-byte RAM for user data storage

Detailed Pin Configuration

The RX8900CE:UB3 has the following pin configuration:

1. VDD: Power supply input
2. GND: Ground connection
3. SDA: Serial Data Line for I2C communication
4. SCL: Serial Clock Line for I2C communication
5. INT: Interrupt output pin
6. SQW/OUT: Square wave output pin
7. X1: Crystal oscillator input
8. X2: Crystal oscillator output
9. VBAT: Backup battery input for maintaining timekeeping during power loss

Functional Features

• Accurate Timekeeping: The RX8900CE:UB3 provides precise timekeeping functionality, ensuring accurate time display and synchronization.
• Low Power Consumption: With a timekeeping current of only 0.35μA, it minimizes power consumption, making it suitable for battery-powered devices.
• Programmable Alarms: Users can set multiple alarms with customizable interrupt capability, allowing for timely notifications or system wake-up.
• I2C Interface: The integrated I2C interface enables easy communication with microcontrollers and other devices supporting the I2C bus protocol.
• Square Wave Output: The SQW/OUT pin generates a square wave signal with programmable frequency, useful for various timing applications.

Advantages and Disadvantages

Advantages: - High precision timekeeping - Low power consumption - Compact size - Flexible alarm functionality - Easy integration with I2C-based systems

Disadvantages: - Limited RAM capacity (64 bytes) - Requires an external crystal oscillator for clock operation

Working Principles

The RX8900CE:UB3 utilizes a highly accurate crystal oscillator to generate clock signals. It maintains timekeeping by counting the oscillations of the crystal and updating the internal registers accordingly. The IC communicates with the host device through the I2C interface, allowing for configuration and data exchange. The backup battery input ensures uninterrupted timekeeping during power loss.

Detailed Application Field Plans

The RX8900CE:UB3 is widely used in various electronic devices that require precise timekeeping, such as:

1. Smartwatches and wearables
2. Industrial automation systems
3. Medical equipment
4. Automotive electronics
5. IoT devices
6. Consumer electronics (e.g., digital cameras, audio players)

Detailed and Complete Alternative Models

1. RX8900CE:UB2 - Similar to RX8900CE:UB3 but with extended temperature range (-40°C to +105°C).
2. RX8900CE:UB4 - Enhanced version with additional features like temperature compensation and extended memory capacity.

These alternative models offer similar functionality while catering to specific requirements or operating conditions.

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