MCP795W21T-I/ST

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Real time clocks (RTCl) are integrated circuits (ICs) that ensure that the system time is accurate and in proper sync with the clock pulses. As one of the most important components of most computer systems, RTCls provide a real-time clock or timer that runs in the background while other components of the system are idle. The MCP795W21T-I/ST is a particularly interesting IC that combines features of a conventional RTCl with features of a microprocessor. This article discusses the MCP795W21T-I/ST’s application field and working principle.

Application Field

The MCP795W21T-I/ST applications include server motherboards, system timekeeping, energy management, data logging, etc. Using its dedicated system time counter (sysTC) circuit with internal oscillator and logic, it can accurately keep track of time for systems with low power consumption, including computer motherboards. The MCP795W21T-I/ST is also used in various types of automotive systems, such as in fuel injection systems in vehicles. Additionally, it can be used to record data log entries via its integrated serial peripherals.

Working Principle

The MCP795W21T-I/ST is a semiconductor IC and comprises of two primary components: the oscillator circuit and the sysTC circuit. The oscillator circuit consists of an oscillator resistor and capacitor, which are connected to a crystal. The crystal outputs an oscillatory signal which is then fed to the sysTC circuit. The sysTC circuit is composed of logic circuits and shift registers that enable the MCP795W21T-I/ST to accurately count time.

The sysTC circuit is divided into two parts: the master clock (MCLK) and the internal clock (ICLK). MCLK is the source of the clock pulses that are used to count time. The frequency of the signals output by the MCLK can be selected based on the application. The ICLK is generated within the sysTC circuit and has a fixed frequency of 32KHz, which is suitable for applications requiring high accuracy and precision. The frequency of the ICLK and MCLK signals are regulated by a prescaler and divider circuits, respectively.

The MCP795W21T-I/ST also features serial communication, allowing the user to read and write data in binary form. In addition, the serial peripherals also include a serial EEPROM that allows the user to save data permanently. This enables the user to store system information and configurations without having to reload them upon bootup.

All in all, the MCP795W21T-I/ST is an advanced, power-efficient RTCl IC with a wide range of applications. It is ideal for systems timekeeping, automotive applications, energy management, and data logging. It provides a highly accurate timekeeping capability, as well as a serial EEPROM for data storage, making it a versatile and powerful IC.

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