LTC2902-1CGN#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LTC2902-1CGN#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: 0.4V to 5.5V - Adjustable reset threshold voltage - Programmable watchdog timer - Low quiescent current consumption - Wide operating temperature range: -40°C to 85°C

Package: The LTC2902-1CGN#TRPBF is available in a 16-pin SSOP package.

Essence: The essence of the LTC2902-1CGN#TRPBF is its ability to ensure reliable operation of electronic systems by monitoring the power supply voltage and providing necessary control signals.

Packaging/Quantity: The LTC2902-1CGN#TRPBF is typically sold in reels, with 2500 units per reel.

Specifications

• Supply Voltage Range: 1.6V to 5.5V
• Reset Threshold Voltage Range: 0.4V to VCC
• Watchdog Timer Range: 1ms to 128s
• Quiescent Current: 10µA (typical)
• Power-On Reset Delay: 200ms (typical)
• Reset Timeout Period: 100ms (typical)

Pin Configuration

The LTC2902-1CGN#TRPBF has the following pin configuration:

```

---

| | | 1 2 3 4 5 6 7 8 | |_______________________________________|

1. GND
2. RESET
3. WDI
4. VCC
5. GND
6. GND
7. GND
8. GND ```

Functional Features

1. Voltage Monitoring: The LTC2902-1CGN#TRPBF continuously monitors the power supply voltage and compares it with the user-programmed threshold voltage.
2. Reset Generation: When the monitored voltage falls below the threshold, the IC generates a reset signal to initiate system reset or shutdown.
3. Watchdog Timer: The LTC2902-1CGN#TRPBF includes a programmable watchdog timer that can be used to monitor system activity. If the system fails to toggle the watchdog input within the programmed timeout period, a reset signal is generated.
4. Adjustable Threshold Voltage: The reset threshold voltage can be adjusted using external resistors, allowing flexibility in setting the desired voltage level.
5. Low Power Consumption: The IC has low quiescent current consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Wide operating voltage range - Adjustable reset threshold voltage - Programmable watchdog timer - Low power consumption - Compact package size

Disadvantages: - Limited number of pins for additional functionalities - Requires external components for voltage threshold adjustment

Working Principles

The LTC2902-1CGN#TRPBF operates by continuously monitoring the power supply voltage. It compares the voltage with the user-programmed threshold voltage. If the voltage falls below the threshold, the IC generates a reset signal. Additionally, the watchdog timer monitors system activity by expecting a periodic input signal. If the input signal is not received within the programmed timeout period, a reset signal is generated.

Application Field Plans

The LTC2902-1CGN#TRPBF can be used in various applications where reliable power supply monitoring and system reset functionality are required. Some potential application fields include: - Embedded systems - Industrial automation - Automotive electronics - Medical devices - Consumer electronics

Alternative Models

1. MAX809: Voltage supervisor IC with adjustable reset threshold voltage.
2. ADM6315: Microprocessor supervisory circuit with watchdog timer functionality.
3. TPS3839: Precision voltage supervisor with programmable reset delay.

These alternative models offer similar features and can be considered as substitutes for the LTC2902-1CGN#TRPBF in specific applications.

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