CAT1021YI-28-GT3

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Power management integrated circuits (PMIC), sometimes referred to as supervisors, are devices that provide power, integrated circuit (IC) timing, and logic control functions within electronic systems. PMIC supervisors are used to ensure reliable and consistent operation of these systems by providing circuit protection and failure restart functions at present and is widely used in consumer electronics, computer, automotive and industrial sectors.

The CAT1021YI-28-GT3 is one such PMIC supervisor developed by Texas Instruments. This device is available in a 28-pin, thin plastic dual in-line package (PDIP). It features extremely low power consumption, a high speed lock time of 18 s, low voltage operation down to 1.8 V, a wide operating temperature range of −40 °C to +85 °C, and can be powered from a wide range of supply currents from 1 µA up to 10 mA.

The CAT1021YI-28-GT3 is designed to provide timing, reset, and sequencing functions and is capable of providing a wide range of application-specific power-on reset (POR), and power-off reset (POOR) windows. It also provides a non-volatile latch that is used to detect abnormal chip power down (CPD) conditions, preventing any further activators or leakage currents being applied by the primary power supplies. Furthermore, the device includes a selectable watchdog timer (WDT) function, providing a dynamic reset system enabling detection of system failures and restarting the system.

The CAT1021YI-28-GT3 is designed for use in applications such as computers, storage, networking, and communication equipment where system reliability is paramount. It is also suitable for use in industrial control systems, automotive, and medical applications. It is also used in battery-powered systems as it can be powered from a wide range of supply currents from 1 µA up to 10 mA.

The principal of operation for the CAT1021YI-28-GT3 is simple yet robust. It uses high accuracy, low power circuitry to accurately measure time intervals and power-up, power-down and reset conditions. At power-up, the device starts counting a sequence of time intervals and pulses. At the end of each time interval, the device analyses the present logic state of the primary power supplies, and the outputs are triggered when certain criteria are met. Once these criteria are met, the CAT1021YI-28-GT3 can provide an output that can be used to reset the system or trigger an external event.

The CAT1021YI-28-GT3 also includes a watchdog timer (WDT) function to detect system-wide failures and restart the system automatically. The WDT is set to either a single pulse or a continuous pulse. When the WDT is triggered, the output of the WDT is sent to the primary power supplies, resetting them and the system is restarted automatically. The WDT can be set with different time intervals, and when the interval is exceeded, the WDT will reset the system.

The CAT1021YI-28-GT3 can be used in a variety of different applications. It is suited for use in embedded systems such as controllers, routers, switches, and telecom equipment. It is also suitable for use in medical and industrial control systems, and is designed to provide a wide range of safety protection functions in automotive applications.

In conclusion, the CAT1021YI-28-GT3 is a PMIC supervisor designed to provide reliable and robust power and timing control for a variety of applications. It features extremely low power consumption, wide operating temperature range, and selectable watchdog timer (WDT) functions. Its principal of operation can be used to provide a wide range of application-specific power-on and power-off reset functions, and the WDT can be used to detect system-wide failures and restart the system automatically.

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