X5165S8IZ

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The X5165S8IZ is a supervisor IC designed for protection against low supply voltage and for reset control in microcontrollers, microprocessors and digital ASICs. It is designed to optimize battery-powered system designs and provides a reset control solution that ensures robust power-on reset coverage for bus-powered systems. It provides two supply-sensing pins called threshold voltage monitoring (TVM) pins that monitor the operating voltage of the system. When the voltage drops below the predetermined supply-sensing trip points at the TVM pins, the reset output is asserted for a minimum of the reset timeout period. The supervisor also includes a RESETn pin that is used to initiate a system reset when asserted and prohibits internal reset generation. The rest of this paper will discuss the application fields and working principle of the X5165S8IZ.

Application Fields

The X5165S8IZ supervisor was designed to optimize battery-powered system designs and bus-powered systems. It monitors the supply voltage and notifies the system if it falls below a predetermined threshold. It allows the user to optimize the system reset process. This could be useful for embedded systems as it provides protection against catastrophic data loss due to low supply voltage conditions.

The X5165S8IZ supervisor can also be used to provide reset control for systems that use hard reset and reset control based on undervoltage. This can be useful in applications such as industrial automation, motor control, avionics, telecom, networking, instrumentation, and medical equipment.

Working Principle

The X5165S8IZ supervisor IC provides two supply-sensing pins called TVM pins that monitor the operating voltage of the system. When the voltage drops below the predetermined supply-sensing trip points at the TVM pins, the reset output is asserted for a minimum of the reset timeout period. The reset timeout period is determined by the resistor resistance value connected to the RESET TIMEOUT pin.

In addition to the supply-sensing pins, the X5165S8IZ supervisor includes a RESETn pin that is used to initiate a system reset when asserted and prohibits internal reset generation. The RESETn pin can be used to initiate a reset either manually or electronically. When the RESETn pin is asserted (low), the reset output is asserted and the internal circuits are reset. When the reset is asserted, all internal registers are cleared, reset timeout is initialized, and all logic is reset.

The X5165S8IZ supervisor also features an active-low output signal, RESET, which is used to reset the system when asserted. The reset timeout period of the device is adjustable between 4.8ms to 20.4s, which is determined by the resistor resistance value connected to the RESET TIMEOUT pin. During normal operation, the RESET pin will remain asserted until the reset timeout period lapses, after which the RESET pin will be deasserted. The reset timeout period is extended if the voltage at the TVM pins falls below the predetermined trip points during the reset timeout period.

In addition to the reset function, the X5165S8IZ supervisor offers an open-drain reset output, RESETW, which is used for early warning of voltage drops at the TVM pins. RESETW will remain asserted when the voltage at the TVM pins is above the predetermined trip points and will be deasserted when the voltage at the TVM pins drops below the trip points. This allows the system to respond before the reset is asserted.

The X5165S8IZ supervisor also includes a WATCHDOG pin, used to monitor the system for unrecoverable faults or hardware lockups. The WATCHDOG pin can be asserted to initiate a reset if the system is not responding as expected. If the WATCHDOG pin is asserted, the reset output will be asserted, regardless of the voltage level at the TVM pins.

Overall, the X5165S8IZ supervisor is an ideal solution for protecting systems from low supply voltage conditions and providing reset control in microcontrollers, microprocessors, and digital ASICs. It can be used to optimize system reset processes and provides protection against catastrophic data loss due to low supply voltage conditions. In addition, it provides an active-low output signal, RESETW, for early warning of voltage drops at the TVM pins, and a WATCHDOG pin for monitoring the system for unrecoverable faults or hardware lockups.

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