LTC2902-2IGN#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LTC2902-2IGN#TRPBF is a voltage supervisor and watchdog timer IC. It is designed to monitor the power supply voltage of electronic systems and provide reset signals or system shutdown when necessary.

Characteristics: - Voltage monitoring range: 1.6V to 5.5V - Adjustable reset threshold voltage - Programmable watchdog timer - Low quiescent current consumption - Small package size: 16-pin SSOP

Package: The LTC2902-2IGN#TRPBF is available in a 16-pin SSOP (Shrink Small Outline Package) format.

Essence: The essence of the LTC2902-2IGN#TRPBF is to ensure the reliable operation of electronic systems by monitoring the power supply voltage and providing necessary actions in case of voltage deviations or failures.

Packaging/Quantity: The LTC2902-2IGN#TRPBF is typically sold in reels containing 2500 units per reel.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage Range: 0.4V to VCC - 0.1V
• Watchdog Timer Range: 1ms to 128s
• Quiescent Current: 10µA (typical)
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The LTC2902-2IGN#TRPBF has the following pin configuration:

```

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| | --| RESETOUT |-- --| GND |-- --| VIN |-- --| VCC |-- --| WDI |-- --| ADJ |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- --| GND |-- |___________| ```

Functional Features

1. Voltage Monitoring: The LTC2902-2IGN#TRPBF continuously monitors the power supply voltage and compares it with the user-adjustable threshold voltage.
2. Reset Generation: When the monitored voltage falls below the set threshold, the IC generates a reset signal to initiate system reset or shutdown.
3. Watchdog Timer: The LTC2902-2IGN#TRPBF includes a programmable watchdog timer that can be used to monitor system activity. If the system fails to toggle the WDI (Watchdog Input) pin within the programmed time, a reset signal is generated.
4. Adjustable Threshold: The reset threshold voltage can be adjusted using the ADJ (Adjust) pin, allowing flexibility in setting the desired voltage level for triggering reset actions.
5. Low Power Consumption: The IC operates with low quiescent current consumption, minimizing power usage in the monitored system.

Advantages and Disadvantages

Advantages: - Wide operating voltage range allows compatibility with various electronic systems. - Adjustable reset threshold provides flexibility in voltage monitoring. - Programmable watchdog timer enhances system reliability. - Small package size enables space-saving integration into compact designs. - Low power consumption minimizes energy usage.

Disadvantages: - Limited number of pins may restrict the availability of additional features or functionalities. - Requires external components for proper operation, increasing overall system complexity.

Working Principles

The LTC2902-2IGN#TRPBF works by continuously monitoring the power supply voltage through the VIN pin. The voltage is compared with the user-adjustable threshold voltage set using the ADJ pin. If the monitored voltage falls below the set threshold, the IC generates a reset signal on the RESETOUT pin.

Additionally, the LTC2902-2IGN#TRPBF includes a watchdog timer feature. The WDI pin needs to be toggled within the programmed time interval to prevent the generation of a reset signal. If the system fails to toggle the WDI pin within the specified time, a reset signal is generated.

Application Field Plans

The LTC2902-2IGN#TRPBF finds applications in various electronic systems where reliable power supply monitoring and reset functionality are crucial. Some potential application fields include:

1. Microcontrollers and Embedded Systems: Ensuring stable operation and preventing system lock-ups.
2. Industrial Control Systems: Monitoring power supply integrity and initiating shutdown in case of failures.
3. Automotive Electronics: Protecting sensitive components from voltage fluctuations and ensuring proper system reset.
4. Medical Devices: Safeguarding critical medical equipment by monitoring power supply conditions.
5. Communication Systems: Preventing system malfunctions and ensuring continuous operation.

Alternative Models

1. LTC2902-