PCF8584
I2C bus controller ICs for parallel to I2C conversion in 20-pin packages
Manufacturer： nxp
series introduction
# PCF8584 Product Series Introduction
## 1. Overview
The PCF8584 product series is a remarkable line of integrated circuits developed by NXP Semiconductors. These devices are primarily designed to serve as real - time clock (RTC) and calendar chips, offering a wide range of features and capabilities that make them suitable for a diverse set of applications. With their high - precision timekeeping, low power consumption, and easy - to - integrate design, the PCF8584 series has become a popular choice among engineers and designers in various industries.
## 2. Key Features
### 2.1 Real - Time Clock and Calendar Functionality
- **Accurate Timekeeping**: The PCF8584 chips are equipped with a highly accurate real - time clock that can keep track of seconds, minutes, hours, days, dates, months, and years. They use an internal oscillator circuit to maintain time with a high degree of precision, ensuring that the time information remains reliable even over long periods.
- **Leap Year Compensation**: The built - in calendar function includes automatic leap year compensation. This means that the device can correctly handle the extra day in February during leap years, providing accurate date information without the need for external intervention.
### 2.2 Low Power Consumption
- **Battery - Backed Operation**: These chips are designed to operate with extremely low power consumption, making them ideal for battery - powered applications. In battery - backed mode, the PCF8584 can continue to keep time even when the main power supply is disconnected. This feature is crucial for applications such as portable devices, where power efficiency is of utmost importance.
- **Standby Mode**: The device also supports a standby mode, where it consumes minimal power while still maintaining the real - time clock functionality. This allows for extended battery life in applications where the device may be in an idle state for long periods.
### 2.3 I²C Interface
- **Easy Integration**: The PCF8584 series uses the popular I²C (Inter - Integrated Circuit) interface for communication with microcontrollers and other devices. The I²C interface is a simple, two - wire serial communication protocol that allows for easy integration into existing systems. It enables the host device to read and write time and control registers on the PCF8584 with minimal hardware complexity.
- **Multiple Device Addressing**: The I²C interface supports multiple device addressing, which means that multiple PCF8584 chips can be connected to the same I²C bus. This feature is useful in applications where multiple real - time clocks are required, such as in multi - zone timekeeping systems.
### 2.4 Alarm Function
- **Programmable Alarms**: The PCF8584 chips come with programmable alarm functions. Users can set specific times or dates for the alarm to trigger. When the alarm condition is met, the device can generate an interrupt signal, which can be used to wake up a microcontroller or perform other actions in the system.
- **Flexible Alarm Modes**: The alarm can be configured in different modes, such as daily, weekly, or one - time alarms. This flexibility allows for a wide range of applications, from simple reminder systems to complex scheduling applications.
### 2.5 Power - On Reset and Watchdog Timer
- **Power - On Reset**: The PCF8584 includes a power - on reset (POR) circuit, which ensures that the device is initialized correctly when power is applied. The POR circuit resets all internal registers to their default values, providing a stable starting point for the device's operation.
- **Watchdog Timer**: A built - in watchdog timer is available in the PCF8584 series. The watchdog timer can be used to monitor the operation of the system
Images for reference
20-DIP
20-DIP,SOT146-1
20-SOIC 0.295