STM6315 Ultra-Low IQ (300nA) High-Accuracy (±1%) Reset IC with Manual Reset Programmable Delay Watchdog Timer Wide VIN (1.8-5.5V) and 200ms Fixed Delay

Features

■ Low supply current of 1.5µA (typ)

■ ±1.8% reset threshold accuracy (25°C)

■ Guaranteed RST VCC = 1.0V

■ Open drain RST assertion down to output can exceed VCC

■ Power supply transient immunity

■ Operating temperature: –40 to +125°C

■ Available in SOT143-4 package.

Applications

1. Battery-Powered Portable Devices

This is its core application area. The ultra-low quiescent current (300nA) is crucial for extending battery life, especially when the device is in standby or sleep mode.

Typical devices: Smartwatches, fitness trackers, wireless earbuds, portable medical devices (glucometers, digital thermometers), smart home sensors (door/window contacts, temperature/humidity sensors).

Why it's suitable: Low power consumption directly translates to longer battery life.

2. Internet of Things (IoT) Devices

IoT nodes and sensors often need to remain in sleep mode for long periods, waking up periodically only to collect and transmit data. They also require system stability.

Typical devices: Wireless sensor nodes, asset trackers, environmental monitors, smart agriculture sensors.

Why it's suitable: Low power consumption meets the needs of long-term battery power. The watchdog timer ensures the device can automatically reboot after a lock-up caused by interference, reducing manual maintenance.

3. Consumer Electronics and Computer Peripherals

Many consumer products require reliable power-on reset and system status monitoring.

Typical devices: Smart remote controls, digital cameras, printers, motherboards, network routers, Solid-State Drives (SSDs).

Why it's suitable: High-accuracy voltage monitoring (±1%) ensures the microprocessor is reliably reset when voltage is insufficient, preventing data corruption or program runaway. The manual reset function facilitates testing and debugging.

4. Industrial Control and Automotive Electronics

These applications operate in complex environments with extremely high demands on system stability and reliability.

Typical devices: Industrial controllers, PLC modules, in-vehicle infotainment systems, Advanced Driver-Assistance Systems (ADAS) sensors, body control modules.

Why it's suitable: The wide operating voltage range (1.8V to 5.5V) accommodates industrial voltage fluctuations. The watchdog and reset functions ensure the system can recover from faults even in harsh electromagnetic environments.

5. Communication Equipment

Network equipment requires stable, uninterrupted 7x24 operation.

Typical devices: Switches, optical modules, gateways, base station modules.

Why it's suitable: The watchdog timer continuously monitors the software state, preventing system "hangs" and ensuring uninterrupted communication.

Description

The STM6315 Microprocessor Reset Circuit is a low power supervisory device used to monitor power supplies. It performs a single function: asserting a reset signal whenever the VCC supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). It also provides a manual reset input (MR). The open drain RST output can be pulled up to a voltage higher than VCC, but less than 6V.

The STM6315 comes with standard factory-trimmed reset thresholds of 2.63V, 2.93V, 3.08V, 4.38V, and 4.63V. The STM6315 is available in the SOT143-4 package.

INFORMATION

Drawing

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