MAX809TTRG Detailed explanation of pin function specifications and circuit principle instructions

The MAX809TTRG is a product from Analog Devices, specifically from their Maxim Integrated portfolio, which is now part of Analog Devices. This particular model is a voltage supervisor IC, designed primarily for monitoring supply voltages and generating reset signals for microcontrollers and other digital devices.

Let's break down the request into specific components:

1. Package Type (封装类型)

The MAX809TTRG comes in the SOT-23-5 package. This is a 5-pin, surface-mount package.

2. Pin Function Specifications and Circuit Principle

The MAX809TTRG has the following pins:

Pin Number Pin Name Description 1 VCC Power supply input. Connect to the positive supply voltage. 2 GND Ground pin. Connect to system ground. 3 RESET Reset output signal. This pin goes low when the supply voltage falls below the threshold voltage. 4 VSS Ground (alternate pin). This is typically connected to GND in most applications. 5 SENSE Sense input. This pin monitors the supply voltage and determines whether the output should be triggered (reset) based on the threshold voltage.

3. Detailed Explanation of Each Pin

Pin 1 (VCC): This pin powers the MAX809TTRG chip. It is the positive voltage supply input. It must be connected to a stable supply voltage for proper operation of the chip.

Pin 2 (GND): This is the ground pin. It should be connected to the common ground of the circuit to complete the electrical path.

Pin 3 (RESET): This pin outputs the reset signal when the supply voltage falls below a specified threshold. The reset signal is active low, meaning it goes low when the system needs to be reset. This is used to initiate a reset on connected microcontrollers or other logic devices.

Pin 4 (VSS): The VSS pin is another ground pin (often connected directly to Pin 2, GND). It helps to maintain a proper reference for the voltage.

Pin 5 (SENSE): This pin is the voltage sensing input. It monitors the supply voltage and triggers a reset output if the voltage goes below the predetermined threshold.

4. FAQ Section (Frequently Asked Questions)

Q1: What is the maximum supply voltage for the MAX809TTRG?

A1: The maximum supply voltage for the MAX809TTRG is 6V.

Q2: What is the typical threshold voltage for the MAX809TTRG?

A2: The typical threshold voltage for the MAX809TTRG is 4.63V.

Q3: How many pins are there in the MAX809TTRG package?

A3: The MAX809TTRG is housed in a 5-pin SOT-23 package.

Q4: What happens when the supply voltage falls below the threshold?

A4: When the supply voltage falls below the threshold, the RESET pin goes low, initiating a reset.

Q5: Can I connect the SENSE pin directly to the supply voltage?

A5: No, the SENSE pin should be connected to the system voltage that needs monitoring, not directly to the supply voltage.

Q6: What is the output type of the RESET pin?

A6: The output of the RESET pin is active low, meaning it goes low when the reset condition is triggered.

Q7: Is the RESET pin open-drain or push-pull?

A7: The RESET pin is open-drain and requires an external pull-up resistor.

Q8: Can the MAX809TTRG be used in automotive applications?

A8: Yes, the MAX809TTRG can be used in automotive applications, but ensure the operating voltage range is suitable for your vehicle’s electrical system.

Q9: How does the MAX809TTRG handle power-down conditions?

A9: During a power-down condition (supply voltage below the threshold), the RESET pin is driven low, signaling a reset event.

Q10: Is there an over-voltage protection in the MAX809TTRG?

A10: The MAX809TTRG does not feature over-voltage protection. It is designed to monitor supply voltage and output a reset when the voltage falls below a threshold.

Q11: What is the typical current consumption of the MAX809TTRG?

A11: The typical current consumption is 1.0µA during normal operation.

Q12: How fast is the response time of the reset output?

A12: The RESET pin typically responds in 50ms when the supply voltage drops below the threshold.

Q13: Can the MAX809TTRG be used with a microcontroller?

A13: Yes, the MAX809TTRG is ideal for use with microcontrollers as it provides a reset signal during power-up or power-down conditions.

Q14: Can I use this IC to monitor multiple voltages in a system?

A14: The MAX809TTRG can only monitor a single voltage, but you could use multiple instances of the IC to monitor different voltages in your system.

Q15: What should I connect the RESET pin to in a microcontroller circuit?

A15: The RESET pin should be connected to the reset input of a microcontroller. It typically requires a pull-up resistor.

Q16: What is the minimum operating voltage for the MAX809TTRG?

A16: The minimum operating voltage is 1.0V.

Q17: Is the MAX809TTRG compatible with 3.3V systems?

A17: Yes, the MAX809TTRG is fully compatible with 3.3V systems and can monitor 3.3V rails.

Q18: Can the MAX809TTRG be used in battery-powered applications?

A18: Yes, due to its low current consumption, the MAX809TTRG is suitable for battery-powered applications.

Q19: What should be done if the reset signal is not needed in a circuit?

A19: If the reset signal is not needed, you can leave the RESET pin unconnected or pull it up to VCC through a resistor.

Q20: How do I calculate the reset threshold for the MAX809TTRG?

A20: The reset threshold is predefined, but you can select different threshold variants (e.g., 4.63V, 4.38V, 2.93V) based on the version of the MAX809 you choose.

Conclusion

The MAX809TTRG is a voltage supervisor IC in a 5-pin SOT-23 package designed to monitor supply voltages and generate reset signals. Its detailed pin function and circuit principles ensure reliable operation for systems needing voltage monitoring, such as microcontrollers. The FAQ section clarifies common concerns and offers insights into using this IC effectively.