AS1914SF-T

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PMIC - Supervisors: AS1914SF-T Application Field and Working Principle

Power management integrated circuits (PMICs) are important components in any computing or electronic system, without which modern devices will not be able to run properly. Recently, more advanced types of PMICs have been appearing on the market, such as supervisors. These supervisors can help to protect against outages, thermal protection, and more. One of these supervisors is the AS1914SF-T, made by ON Semiconductor.

The AS1914SF-T is a preferred power supervisor for many embedded applications such as PDAs, cellular phones, MP3 players, and other portable equipment. It helps to regulate various components, including the power input, battery, touch screen, LCD, and system rest. Due to its low power consumption and user-friendly package configurations, this supervisor provides a cost-effective solution that not only meets the performance needs of modern devices, but also saves energy and money.

Features of AS1914SF-T

The AS1914SF-T was designed with a 0.5V accuracy, on-chip trimming, and low-power sleep mode. This supervisor also provides a better accuracy than many of its competitors, along with a wide range of features. Some of the features of this supervisor include:

• 2 independent voltage supervisors
• 1 input voltage range of 1.6V to 5V
• Power-on reset delay time selectable from 200ms to 1.5s
• 2 resets routable to separate parts of the system
• 3 interrupt pins with selectable overflow modes
• Output reset polarity programmable, with optional 5V tolerant
• Low power consumption of about 5.4mA

Applications of the AS1914SF-T

Due to its advanced features, the AS1914SF-T is suitable for many different applications, such as:

• Computers and laptops
• Cellular phones and PDAs
• Consumer electronics, including MP3 players and gaming consoles

The AS1914SF-T can also be used in automotive applications that require a high-performance power supervisor, such as in car stereo systems, airbags, and headlights.

How the AS1914SF-T Works

The AS1914SF-T works by monitoring both the power input voltage and battery voltage of the device. It then compares the two to determine if the device is operating within normal parameters. If the parameters are outside of normal thresholds, the supervisor will trigger a reset signal, or an interrupt, depending on the user’s configuration. This signal can be used to alert the user that something isn’t functioning properly, or to shut down the system altogether.

The AS1914SF-T also has an automatic power-on reset (POR) functionality, which activates once the power is supplied. This feature helps to ensure that the device will operate properly, even if the power supply is unstable. Additionally, the supervisor can be programmed to delay the reset signal to provide a more reliable reset.

Conclusion

The AS1914SF-T power supervisor is an advanced yet cost-effective solution for many electronic applications. It offers a wide range of features, is low power, and is available in user-friendly package configurations. Although it is mainly used in embedded devices, it can also be used in automotive applications. Additionally, the supervisor can monitor both power input and battery voltage, and trigger a reset or interrupt when outside of normal parameters.

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