RX-8025NB:AA

Product Overview

Category: Integrated Circuit (IC)

Use: Real-Time Clock (RTC) Module

Characteristics: - Small form factor - Low power consumption - High accuracy timekeeping - Battery backup for continuous operation - I2C interface for easy integration

Package: Surface Mount Technology (SMT)

Essence: The RX-8025NB:AA is a highly reliable and accurate real-time clock module designed for various electronic devices that require precise timekeeping.

Packaging/Quantity: The RX-8025NB:AA is typically packaged in reels or trays, with quantities varying based on customer requirements.

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 Interface: Supports standard and fast mode (100 kHz and 400 kHz)
• Battery Backup Voltage: 1.4V to 5.5V
• Battery Backup Current: 0.35 μA (typical)

Detailed Pin Configuration

The RX-8025NB:AA has the following pin configuration:

| Pin Name | Function | |----------|----------| | VDD | Power supply voltage input | | GND | Ground | | SDA | Serial Data Line for I2C communication | | SCL | Serial Clock Line for I2C communication | | SQW/INT | Square Wave Output / Interrupt Output | | VBAT | Battery Backup Voltage Input |

Functional Features

• Real-time clock with calendar functionality
• Automatic leap year compensation
• Alarm function with programmable interrupt output
• Square wave output with selectable frequencies (1 Hz, 32.768 kHz, 4096 Hz, or 8192 Hz)
• Battery backup for continuous operation during power loss
• Power-on reset function

Advantages and Disadvantages

Advantages: - High accuracy timekeeping - Low power consumption - Small form factor for easy integration - Wide operating temperature range - Flexible I2C interface for communication

Disadvantages: - Limited square wave output frequency options - Requires an external battery for backup

Working Principles

The RX-8025NB:AA utilizes a highly stable crystal oscillator to generate accurate timekeeping signals. It incorporates an internal counter that keeps track of the current time and date. The module communicates with the host microcontroller through the I2C bus, allowing for easy configuration and retrieval of time information.

During normal operation, the module is powered by the main supply voltage (VDD). In case of a power loss, the battery backup voltage (VBAT) ensures uninterrupted timekeeping. The module also features a power-on reset function to ensure proper initialization upon power-up.

Detailed Application Field Plans

The RX-8025NB:AA is widely used in various applications that require precise timekeeping, such as:

1. Consumer Electronics: Digital clocks, watches, and timers.
2. Industrial Automation: Programmable logic controllers (PLCs), data loggers, and time-sensitive control systems.
3. Automotive: On-board computers, infotainment systems, and navigation devices.
4. Medical Devices: Patient monitoring systems, infusion pumps, and diagnostic equipment.
5. Communication Systems: Network switches, routers, and base stations.

Detailed and Complete Alternative Models

1. RX-8900NB:AA - Similar real-time clock module with extended temperature range (-40°C to +105°C).
2. DS3231 - Real-time clock module with higher timekeeping accuracy and additional alarm features.
3. PCF8563 - Low-power real-time clock module with integrated temperature compensation.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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