X40420S14I-A

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The X40420S14I-A is an integrated supervisor from Xicor Inc. This product is categorized as a PMIC - Supervisors. This product contains an array of 3.3V digital circuitry including a watchdog timer and other advanced features for secure embedded system design. The 44 lead LFCSP (leadless flap chip scale package) of this product allows for an efficient board layout for space reduction.

The X40420S14I-A is an integrated system reset generator designed to provide “intelligent” power-on reset, fault reset and power-down reset functions. It is intended for low-voltage embedded application designs that require precise control with monitoring of chip power-up, power-down, operating status and temperature limit.This device monitors two independent supply voltages, VB_MAIN and VB_, and is capable of resetting multiple output pins upon detection of a threshold, also known as a “trip point”. Additionally, users can configure the device for active-high, active-low and push-pull reset operations.

The X40420S14I-A operates within the voltage range of 1.8V ~ 3.6V and is capable of supplying a maximum current of 2.1mA, making it suitable for a variety of applications such as digital-sensor or communications sub-systems. The device consists of a reset generator circuit, a watchdog timer, and a low-voltage reset trip-point latch, along with a temperature sense input and a 2-step under-voltage monitor with separate auto-reset thresholds. It also features - prevent-reset, ignore-reset and output-stage delay control.

The primary application field of the X40420S14I-A devices is designed as a reset ICs, solutions providers and system monitoring ICs to meet the need for a safe, efficient and cost-effective system reset generator. It is suitable for applications such as switches, sensors, Ethernet, USB, Modbus and other small and medium-sized embedded systems. Xicor\'s product design provides greater versatility by allowing users to adjust the timing of a system reset event and to monitor temperature levels and supply voltage levels. The programmable system parameters (reset trip point, watchdog timeout, etc.) enable a flexible system configuration.

The working principle of the X40420S14I-A is based on the use of an integrated voltage detector, watchdog timer, and reset latch circuitry, which together provide the necessary functions for an “intelligent” system reset generator. When the input supply voltage, VB_MAIN, falls below a predetermined threshold, an internal voltage detector circuit introduces an internal power-on reset signal to reset all outputs. An independent voltage monitor, VB_, senses the externally supplied voltage, e.g. a supply voltage from a battery backup. The 2-step under-voltage circuit can be used to detect either an under-voltage or over-voltage condition of this supply voltage.

Furthermore, due to it\'s integrated watchdog timer functioning, the X40420S14I-A allows for resetting of the system due to a stuck system from its user-defined timeout periods, supplying a crucial feature for system reliability. The system reset signal is routed through a programmable delay stage prior to the outputs to provide an output delay window for the reset signals.

The various parameters, such as the voltage level trip point, time delays, pull-up/pull-down, and low-voltage reset trip-point latching, are completely programmable and can be easily altered by the user to satisfy applications with different requirements. The device also has an integrated temperature check circuit, which allows safe and intelligent operation of the system even when subjected to hazardous operational temperatures.

In short, the X40420S14I-A is an integrated supervisory device that allows for precise control and monitoring of embedded applications with operating voltage and temperature range. It has strong integrated features that makes it suitable for devices ranging from switches, sensors, Ethernet, USB, Modbus and other small to medium-sized embedded systems.

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