STM6315SDW13F Integrated Circuits (ICs)

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STM6315SDW13F is an IC from STMicroelectronics that is part of PMIC - Supervisors family. It helps system designers protect electronic devices from catastrophic malfunction and failure due to wrong voltages and currents caused by anomalies or intentional adjustments. It offers feedback and indication of protected system status. This almost invisible element of design helps guarantee quality and reliability of the protected system.

The device monitors 3.3V and 5V power levels within a given system and controls two dedicated ground fault detect outputs. It monitors up to 8 input voltage supplies, protects environment through brown-out and supply undervoltage, along with overvoltage protection. It acts as a watchdog supervisor or as a sys reset signal generator with manual reset pulse injection capability. It also works as a voltage monitor with adjustable boolean or programmable level threshold.

The STM6315SDW13F offers a wide range of useful features like POL protection, analog watchdog output, digital status reporting, active low reset signal, adjustable timeout reset, integrated complete power-on reset and an extra watch time-out. It is designed to provide long lasting, quality operation through its wide operating temperature range of -40° to +150°C. The device is available in one package - STMNB 6.5 leaded thin HTSSOP.

Application Field

The STM6315SDW13F is used in a variety of applications, such as industrial automation and control systems, game consoles, automotive, medical, audio/video equipment, portable communication devices and white goods, etc. It plays a role of an effective protector in safeguarding critical elements from unexpected current surges, voltage drops and other electrical anomalies.

The device is an ideal choice for monitoring several power supplies in systems that don’t have enough space for reset circuitry. It lends itself to cost effective implementation of power supply monitoring, and adds a layer of safety against low and high supply voltages or shorts to ground or common supplies.

Working principle

The STM6315SDW13F acts as a reliable guard of a system’s supply rails. The device checks the voltages of all the power supplies the system relies on and generates the reset or watchdog signals appropriate to the detected situation. When the system\'s power supplies start to drop below the regulation point, the device acknowledges and provides feedback through one of two signals: RESET# and RESET_B, or WDT# and WDT_B.

When the device receives a RESET# signal, it will initiate a system reset, alerting and advising the system that its power level has fallen outside the acceptable range and to reset itself. On the other hand, when WDT# is activated, the microcontroller will be alerted that it has a potential for reset and begin to modify its behavior accordingly. For example, a microcontroller may begin executing plan B of its functionality, rather than risking a sudden reset from a power failure.

The user has control over the time thresholds of the device. On-chip programmable logic allows the user to set reset hold-off times, reset digital delay and manual reset pulse injection capability. Also, two stage analog watchdog with programmable thresholds provide precise measurement of the system’s power levels.

The device has two adjustable fault threshold inputs, which are fixed and adjustable. The fixed settings include OV fault, UV fault and I/O fault. The adjustable settings include OV fault and UV fault. The user must define the settings based on the application and system.

The STM6315SDW13F provides an effective, cost efficient way of safeguarding a system from catastrophic failure due to wrong voltages and currents. Its wide range of features makes it a powerful solution for reset circuitry in space-limited systems and for voltage and current protection.

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