DS1814BR-10/T&R

PMIC - Supervisors: DS1814BR-10/T&R Application Field and Working Principle

PMIC supervisors, such as the Dallas Semiconductor Corporation’s DS1814BR-10/T&R, are integrated circuits (ICs) used to monitor or supervise power supply systems in computers or other electronic systems. The DS1814BR-10/T&R is comprised of two circuits- a voltage supervisor and a reset timer. This functional combination permits the monitoring of voltage sequence, level and presence of a system’s power supply and allows implementation of an independent reset timeout.

A voltage supervisor, also known as a watchdog, monitors the voltage supply and sets off an alarm if the supply deviates from normal operating parameters. These parameters may have their own dedicated inputs or, more commonly; various voltage thresholds can be programmed into the IC by connecting a single reference voltage.

The DS1814BR-10/T&R’s voltage supervisor circuit works in two modes--Monitor/OffMode and interlock mode. In Monitor/OffMode, the voltage supervisor can be put in an inactive or standby state when the input voltage does not exceed its reference voltage by more than a predetermined amount. This mode enables the system’s microprocessor to reduce power consumption without affecting the system’s functionality. Once the input voltage exceeds the reference voltage by the predetermined amount, the voltage supervisor will assert its active state and output an active low signal.

In Interlock mode, the voltage supervisor enters its active state when the input voltage deviates from the previous voltage by an amount equal to or less than a third predetermined level. Once the voltage deviation is detected, the voltage supervisor will stay in the active state until the input voltage returns to a level within the predefined operating parameters. In almost all cases, the voltage supervisor will assert its active state if the input voltage deviates in either direction from its reference voltage.

In addition to voltage supervision, the DS1814BR-10/T&R also offers a reset timer. This timer can be used to insure the system’s microprocessor has correctly reset in a given amount of time. It is usually used in conjunction with a voltage supervisor. If a voltage supervisor is asserted, the DS1814BR-10/T&R will reset its timer and wait for the microprocessor to perform its reset function. If the timer reaches its predetermined timeout threshold and the microprocessor has not reset the system, the DS1814BR-10/T&R will reset the system using its built-in reset circuitry.

The DS1814BR-10/T&R offers a wide range of applications in desktop and notebook computers, printers, non-volatile memory systems, communication equipment, vehicle processors, and numerous other systems that require voltage supervision and reset protection. By providing the current monitoring and software protection, the DS1814BR-10/T&R can help to ensure system reliability and increase product lifetime.

In summary, the DS1814BR-10/T&R is a PMIC supervisor that provides both voltage monitoring and reset timer functions. It is used to monitor and interface with the power supply in order to ensure reliability and extended product lifetime. Its voltage supervisor mode can be programmed to detect either rising or falling deviations in the input voltage and is designed to quickly reset the system in the event of an undesired voltage deviation or microprocessor reset failure. The reset timer assists in the earliest detection of system reset failures and adds another layer of protection for the system.