LTC694IS8-3.3#PBF

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Power management integrated circuit (PMIC) system supervisors are important components in any electronic device. PMIC supervisors provide critical device communication, control and monitoring functions. The LTC694IS8-3.3#PBF is a versatile PMIC supervisor that is suitable for a wide range of applications. This article will describe the application fields and working principles of the LTC694IS8-3.3#PBF.

The LTC694IS8-3.3#PBF is an 8-channel PMIC supervisor with an operating voltage of 3.3V. This PMIC provides a wide range of protection and control functions, allowing for secure and robust operation of the system. The main features of the LTC694IS8-3.3#PBF include:

• Automatic reset monitoring of up to eight independent supply voltage threshold conditions, each with its own reset time delay
• Up to eight independent, programmable overvoltage and undervoltage detection thresholds and trip points
• Integrated voltage supervisor monitor (VSM) circuit with an adjustable reset threshold
• Integrated power-on reset (POR) circuitry with adjustable reset time delay and a programmable reset width
• A programmable reset pulse width of 150 ms or 1 second, depending on the configuration
• Four distinct mode of operation: normal, manual reset, override, and power save
• An optional EPROM for storing custom configuration information
• Two programmable timeout signals
• Temperature monitor and trip point detection
• Pulse-by-pulse current to voltage (PDC) monitor and trip point detection

The LTC694IS8-3.3#PBF is designed to work with a variety of microprocessors, microcontrollers, and other digital electronic systems. Its built-in safety and control features make it an ideal choice for applications that require reliable and secure operation of a system.The LTC694IS8-3.3#PBF is commonly used in a wide range of applications, including:

• Telecommunications systems
• Computer systems
• Networking equipment
• Industrial automation systems
• Medical control systems
• Robotic control systems

The LTC694IS8-3.3#PBF is built on a CMOS fabrication process and employs an analog and digital core. The analog core monitors the voltage inputs, detects overvoltage or undervoltage conditions and provides a reset pulse. The digital core controls the analog core, processes the signals and updates the output status.The on-chip voltage sense comparator of the LTC694IS8-3.3#PBF has an adjustable trip point and reset time delay that is selected by a single external resistor connected to the COMP pin. When the monitored voltage exceeds the preset trip point, the supervisor initiates a reset pulse with a duration determined by the external resistor. Additionally, the supervisor provides a programmable reset pulse width, which can be selected to either 1 second or 150 milliseconds.The supervisor also incorporates a temperature monitor circuit, as well as a pulse wrapping control (PWC) circuit, which enables the user to set the maximum pulse duration of a signal. The PWC circuit will allow the user to set the maximum pulse width to either 1 second, 500 milliseconds, 200 milliseconds, or 100 milliseconds.The voltage-sense detect and reset circuits can be overridden with a logic signal or a manual override signal, allowing for manual reset of the circuit. This feature can be used for debugging or for any other purpose where manual reset is required.Overall, the LTC694IS8-3.3#PBF is an excellent choice for high-reliability, low-power applications where multiple voltages need to be monitored. The chip is available in a 28-pin DIP package and has an operating temperature range of -40°C to +125°C.

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