Overview
The STM6315SDW13F from STMicroelectronics is a low-power supervisory device designed to monitor power supplies and assert a reset signal when the supply voltage drops below a predefined threshold. This microprocessor reset circuit is essential in ensuring the stable operation of microcontrollers and other digital systems. It features an active-low, open-drain reset output and a manual reset input, making it versatile for various applications. The device is available in a compact SOT143-4 package and operates over a wide temperature range from -40°C to +125°C.
Key Specifications
| Parameter | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Operating Voltage | Supply Voltage | 1.0 | 5.5 | V | |
| ICC VCC Supply Current | At VCC = 5.5V, no load, TA = -40 to +85°C | 2.0 | 12 | 15 | µA |
| ICC VCC Supply Current | At VCC = 3.6V, no load, TA = -40 to +85°C | 1.5 | 10 | 12 | µA |
| VOL RST Output Voltage | VCC > 4.25V, ISINK = 3.2mA | 0.4 | V | ||
| VOL RST Output Voltage | VCC > 2.5V, ISINK = 1.2mA | 0.3 | V | ||
| VOL RST Output Voltage | VCC > 1.0V, ISINK = 80µA | 0.3 | V | ||
| Reset Threshold Accuracy | At 25°C | ±1.8% | |||
| Operating Temperature | -40 | +125 | °C |
Key Features
- Low Supply Current: Typical supply current of 1.5µA at VCC = 3.6V and 12µA at VCC = 5.5V.
- High Accuracy Reset Threshold: ±1.8% reset threshold accuracy at 25°C.
- Open Drain RST Output: Can be pulled up to a voltage higher than VCC, but less than 6V.
- Manual Reset Input: Logic low on MR asserts RST, with an internal pull-up resistor of 63kΩ (typ).
- Power Supply Transient Immunity: Resistant to negative-going VCC transients.
- Compact Package: Available in SOT143-4 package.
- Wide Operating Temperature Range: From -40°C to +125°C.
Applications
- Microcontroller Systems: Ensures stable operation by monitoring the power supply and asserting a reset signal when necessary.
- Embedded Systems: Ideal for use in embedded systems that require reliable power supply monitoring.
- Industrial Automation: Suitable for industrial automation systems where robust power supply monitoring is critical.
- Consumer Electronics: Used in various consumer electronic devices to ensure reliable operation under varying power conditions.
Q & A
- What is the primary function of the STM6315SDW13F?
The primary function is to monitor the power supply and assert a reset signal whenever the VCC supply voltage drops below a preset value or when the manual reset input is triggered.
- What is the typical supply current of the STM6315SDW13F?
The typical supply current is 1.5µA at VCC = 3.6V and 12µA at VCC = 5.5V).
- What is the accuracy of the reset threshold?
The reset threshold accuracy is ±1.8% at 25°C).
- Can the RST output be pulled up to a voltage higher than VCC?
- How does the manual reset input work?
A logic low on the MR input asserts the RST output, and it remains asserted while MR is low and for the reset time-out period after MR returns high).
- What is the operating temperature range of the STM6315SDW13F?
The operating temperature range is from -40°C to +125°C).
- What package type is the STM6315SDW13F available in?
The device is available in the SOT143-4 package).
- How does the device handle power supply transients?
The device is relatively immune to negative-going VCC transients and includes features for transient immunity).
- What is the recommended pull-up resistor value for the RST output?
A 10kΩ pull-up resistor is sufficient in most applications).
- Is external debounce circuitry required for the manual reset input?
No, external debounce circuitry is not required, but a 0.1µF capacitor can be added for additional noise immunity).
