S-80939CLNB-G69T2G

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Power management integrated circuits (PMICs) are essential components of any system-on-chip design. The device, S-80939CLNB-G69T2G, is one type of PMICs—Supervisors— developed by Rohm Semiconductor. It is specially designed to monitor system power management and supervise the operation of low voltage systems.

This device integrates a number of features and functions, such as system reset and watchdog timer (WDT), brown-out detection (BOD), power-on reset (POR), under voltage protection (UVP), and low voltage reset (LVR). In addition, it operates with an adjustable threshold, allowing users to adjust the voltage level according to their application needs. These features make it ideal for use in all kinds of applications, including consumer electronics, automobiles, industrial and process control, medical, and military and aerospace.

S-80939CLNB-G69T2G can be used in a variety of architectures, such as single-chip systems or multi-processor/multi-core systems. It supports wide operating voltage ranging from 2.0V to 5.5V, with high accuracy of ±2.5% accuracy. The device also incorporates an embedded rise/fall interrupt monitor with an adjustable voltage window, which helps to detect voltage glitches in the system. In addition, it features an output delay block, which helps ensure a smooth system power-on sequence.

Regarding its working principle, S-80939CLNB-G69T2G is essentially a voltage monitor with an adjustable voltage threshold, which is set by the external resistors. The device will track the voltage level across the Vth pin, and will compare it to the internal reference voltage Vref. When the voltage across Th pin is higher than Vref, the monitor output RESET is held low; if the Vth pin is lower than Vref, RESET will be pulled high, resulting in a reset operation of the system.

In addition, S-80939CLNB-G69T2G also features an embedded WDT, which is used to detect system failures and reset the system if required. It consists of a counter and an oscillator, with adjustable timeout period range (1.6s to 100s). When the counter reaches the programmed value before the timeout expires, the WDT will issue a reset signal, provided that it is enabled. Otherwise, it will stay in the idle state until a normal system shut-down.

In conclusion, S-80939CLNB-G69T2G is a highly integrated power management IC suitable for a variety of applications. It is especially suitable for low voltage systems that need robust power-on reset and watchdog timer functions. It also supports adjustable voltage thresholds, allowing users to customize their system’s reset levels for improved system reliability and stability.

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