S-80844CNY-B2-U

Power Management Integrated Circuits (PMICs) are responsible for managing the power of different components of an electronic system. Supervisors are a particular type of PMICs, and the S-80844CNY-B2-U is an example of such device. It is a regulator supervisor, i.e. a device that monitors the voltage of a power supply and activates a reset signal when it is outside of a certain range. This article will discuss the application field, as well as the working principle, of the S-80844CNY-B2-U.

Application Field

This device has been developed to provide reset signals in order to protect semiconductor memory from unexpected power-down and power surges. It is thus particularly suitable for embedded systems based on microcontrollers and FPGAs. The S-80844CNY-B2-U can also be used in automotive applications, as it is qualified according to AEC-Q100 and supports a wide temperature range (-40°C to 125°C).

Working Principle

The input of the regulator supervisor is connected to the output of a voltage regulator. The regulator supervisor then compares the voltage level of the regulator output with two preset thresholds, one for high voltage (VH) and one for low voltage (VL). If the voltage level is above the high voltage threshold, a reset signal is generated and sent to the microcontroller or FPGA. Similarly if the voltage is below the low voltage threshold, a reset signal is generated. The reset signal remains active until the input voltage is either greater than VL, or lower than VH.

In order to be able to detect out-of-range voltage levels, the S-80844CNY-B2-U has several hysteresis levels. These are adjustable and are responsible for defining the margin between the two reset thresholds. The device also has an active-low open-drain reset signal output, which will remain active until the input voltage is within the range. This signal can be connected to any controller, memory or processor in order to reset them in case of an out-of-range input voltage.

Finally, the device has an on-disable pin, which can be used to connect it to a power-on/off switch in order to ensure that the regulator supervisor is only active when the switch is in the on position.

In conclusion, the S-80844CNY-B2-U regulator supervisor is ideally suited for embedded systems, as it is capable of providing protection against unexpected power-down and power surges. It can be used in automotive applications and provides an adjustable hysteresis and active-low open-drain reset signals.