SNTH81W

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The SNTH81W is an advanced voltage detector and supervisor integrated circuit specifically designed for battery-powered systems. It features low-voltage detection and two interrupt outputs, as well as two reset outputs controlled by the correct sequence of power-on low-voltage reset and wake-up by resistive pull-up. This IC’s applications and working principles are outlined below.

Application of SNTH81W

The SNTH81W is designed for a variety of voltage detection applications, including mobile phones, digital cameras, data communications equipment, and medical instruments. This IC can reliably detect a pre-set threshold voltage, set two interrupt outputs, and reset two outputs, without the need for external components.

This IC is suitable for a range of input voltages, from 1.2V to 5.5V, making it ideal for many typical battery-powered devices. It also has a wide detection range of +2.7V to +5.5V. In addition, it can select four detection voltages with a hysteresis of 30mV and is able to switch two outputs by CMOS logic.

Working Principle of SNTH81W

The SNTH81W operates using a voltage detection circuit and two selector circuits. The voltage detection circuit includes an internally-generated reference voltage (VREF), which is compared to the voltage detection pin voltage (VPD). When this pin voltage is higher than VREF, the output (OUT_EN) is set to "high". When this pin voltage is lower than VREF, the output (OUT_EN) is set to "low".

The two selector circuits (or "mux circuits") are used to select either the Comparator ON/OFF logic or the Voltage Detector ON/OFF logic, depending on the logic input selection (VLOGIC). This allows the SNTH81W to detect a voltage drop when the output is OFF, or allow the output to remain ON even after a voltage drop occurs.

The SNTH81W also features a reset circuit and two reset output pins (RES1 and RES2). The reset circuit receives five signals from the Power-On Reset (POR), Low Voltage Sense (LVS), Power-On Delay (POD), Wake-Up Sleep (WUS), and Sleep (SLP) pins. When the sequence of power-on low-voltage reset and wake-up by resistive pull-up is completed, the two reset output pins are activated.

Conclusion

The SNTH81W is an advanced integrated circuit designed for battery-powered systems. It features voltage detection, two interrupt outputs, and two reset outputs, all with minimal need for external components. This IC is suitable for a range of input voltages, and ensures accurate and reliable operation in a variety of applications.

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