AS1909C20-T Integrated Circuits (ICs)

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PMIC (Power Management Integrated Circuit) is an important component used in industrial applications. Supervisors are an important type of PMIC which are designed to monitor the system power supply, detect under and over voltage conditions, provide an alarm type of indication and/or initiate a latching of the power supply. The AS1909C20-T is a supervisor IC from Richtek Technology Corporation. It contains a voltage detector, reset timer and watchdog timer in a single chip solution with integrated active-low reset and active-low watchdog outputs for the reset and power on functions of the system respectively.

The AS1909C20-T is mainly used in portable systems and electronic devices that require low-power standby operation. Typical applications include mobile phones, PDAs, digital cameras, MP3 players, Bluetooth devices, and other hand-held products.

The AS1909C20-T provides an efficient way of monitoring the system power supply by comparing several power supply voltages with internal references. The DC input voltage range of the chip is from 2.6V to 6.3V. This voltage monitor can detect under and over voltage conditions to keep the system from catastrophic failure. The chip also features internal circuitry that allows wake-up from standby control by low standby current mode for reducing system power consumption.

The AS1909C20-T has two integrated delay timers to guard against timeouts of the system. When the delay time is exceeded, the active-low reset and active-low watchdog outputs are asserted. The chip also features an internal active-low reset output to generate reset signals based on voltage or timer out conditions. The reset will be asserted until the expired condition is cleared.

The AS1909C20-T also has an integrated output driver to ensure a fast and robust reset signal to the MCU once a critical voltage or timer out condition has been detected. It also integrates an under voltage lockout (UVLO) circuit to protect the IC from excessive input voltage and prevents any undesired system behavior.

The AS1909C20-T supervisor IC device helps reduce design complexity, board size, and cost by combining voltage detector, reset timer, and watchdog timer functions into a single chip. The chip is also offered in a very small 14-pin WDFN package for portable applications.

In conclusion, the AS1909C20-T is an ideal supervisor IC for portable system and electronic device applications that require low-power standby operation. The integrated features of the chip, such as voltage detector, reset timer, watchdog timer, and output driver, provide an efficient way of monitoring the system power supply and protecting the system from catastrophic failure.

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