Microchip TCM810JENB713 Voltage Supervisor: Features and Application Circuits

In the realm of electronic design, ensuring system stability and data integrity during power-up, power-down, and brownout conditions is paramount. The Microchip TCM810JENB713 is a dedicated voltage supervisor, or microprocessor reset IC, designed specifically to monitor power supply voltages and provide a reliable reset signal to a microcontroller or microprocessor. Its simplicity, reliability, and cost-effectiveness make it an essential component in a vast array of embedded systems, from consumer electronics to industrial controls.

Key Features of the TCM810JENB713

The TCM810JENB713 distinguishes itself through a set of robust features tailored for precise voltage monitoring:

Precise Voltage Monitoring: This device is factory-trimmed to monitor a fixed voltage threshold of 4.38V. This high level of accuracy is critical for ensuring the processor only operates when the supply voltage is within a safe and stable range.

Active-Low Reset Output: It features an active-low reset output (/RESET), which asserts a logic low signal when the VCC supply voltage falls below the preset threshold. This signal remains asserted for a minimum period after VCC rises back above the threshold, ensuring the connected processor begins operation from a known state.

Manual Reset Capability: A key feature is the inclusion of a manual reset input (MR). This allows an external switch or another digital signal from the system to force a processor reset on demand, greatly aiding in debugging and user-initiated system restarts.

Low Power Consumption: The device operates with very low supply current, typically drawing only 30 µA. This minimizes the power burden on the system's supply rail, making it ideal for battery-powered and energy-sensitive applications.

Small Form Factor: Housed in a compact SOT-23-3 package, the TCM810JENB713 requires minimal board space, supporting the development of smaller and more densely packed PCB designs.

Extended Temperature Range: It is characterized for operation over the industrial temperature range (-40°C to +85°C), ensuring reliable performance in harsh environmental conditions.

Application Circuits

The TCM810JENB713 is incredibly straightforward to implement, typically requiring only a single bypass capacitor. Its primary application is as a microprocessor reset controller.

1. Basic Microprocessor Reset Circuit:

The most common application is shown in the circuit below. The VCC pin is connected to the system's power supply rail (e.g., 5V). The /RESET output is connected directly to the reset pin of the microcontroller (MCU). A 0.1 µF bypass capacitor is placed close to the VCC and GND pins to filter noise. The manual reset (MR) pin can be left floating or pulled up to VCC with a resistor (e.g., 10kΩ). When left floating, it is internally pulled high. Connecting a momentary switch between MR and ground allows a user to manually initiate a reset.

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+5V (VCC) ---+---