Overview
The STM706M6E, produced by STMicroelectronics, is a 5 V supervisor IC designed to provide microprocessor supervisory functions. This device is part of the STM705/706/707/708/813L family and is specifically tailored to monitor and manage the power supply and reset conditions of microprocessors.
It features a precision voltage reference and comparator that monitors the VCC input for out-of-tolerance conditions. When such a condition occurs, the reset output (RST) is forced low or high, depending on the configuration. The STM706 also includes a watchdog timer and a power-fail comparator to provide early warnings of impending power failure.
The device is available in standard 8-pin SOIC and space-saving 8-pin TSSOP packages, making it versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage | 5 | V |
| RST Threshold | 4.25 - 4.50 | V |
| Reset Time-out (trec) | 200 ms (typ) | ms |
| Watchdog Timer | 1.6 s (typ) | s |
| Manual Reset Input (MR) | Active-low | - |
| Power-fail Comparator | PFI/PFO | - |
| Supply Current | 40 μA (typ) | μA |
| Operating Temperature (Industrial Grade) | -40 °C to 85 °C | °C |
| Operating Temperature (Automotive Grade) | -40 °C to 125 °C | °C |
| RoHS Compliance | Yes | - |
Key Features
- Precision VCC monitor with reset thresholds between 4.25 V and 4.50 V for the STM706
- RST and RST outputs for flexible reset signaling
- Watchdog timer with a typical timeout of 1.6 seconds
- Manual reset input (MR) for external reset control
- Power-fail comparator (PFI/PFO) for early warning of power failure
- Low supply current of 40 μA (typical)
- Guaranteed RST assertion down to VCC = 1.0 V
- Operating temperature range: -40 °C to 85 °C (industrial grade) or -40 °C to 125 °C (automotive grade for STM706 only)
- RoHS compliance with lead-free components
Applications
The STM706M6E is suitable for a variety of applications where reliable power supply monitoring and reset management are critical. These include:
- Industrial control systems
- Automotive systems (especially for the automotive-grade version of STM706)
- Embedded systems requiring robust power management
- Medical devices needing precise voltage monitoring
- Consumer electronics where reliable reset functionality is essential
Q & A
- What is the primary function of the STM706M6E?
The primary function of the STM706M6E is to provide microprocessor supervisory functions, including precision VCC monitoring, reset output, watchdog timer, and power-fail comparator.
- What are the typical reset thresholds for the STM706M6E?
The reset thresholds for the STM706M6E are between 4.25 V and 4.50 V.
- What is the purpose of the watchdog timer in the STM706M6E?
The watchdog timer is designed to trigger a reset if the watchdog input (WDI) does not see a rising or falling edge within 1.6 seconds, indicating a system malfunction.
- How does the manual reset input (MR) work?
The manual reset input (MR) asserts the reset output when it is taken low. The reset remains asserted as long as MR is low and for the reset time-out period (trec) after MR returns high.
- What is the power-fail comparator used for?
The power-fail comparator (PFI/PFO) provides an early warning of impending power failure by comparing the power-fail input (PFI) to an internal reference voltage.
- What are the operating temperature ranges for the STM706M6E?
The operating temperature range is -40 °C to 85 °C for the industrial grade and -40 °C to 125 °C for the automotive grade.
- Is the STM706M6E RoHS compliant?
Yes, the STM706M6E is RoHS compliant with lead-free components.
- What are the typical package types for the STM706M6E?
The device is available in standard 8-pin SOIC and space-saving 8-pin TSSOP packages.
- How does the reset output behave during power-up?
During power-up, once VCC exceeds the reset threshold, an internal timer keeps RST low for the reset time-out period (trec). After this interval, RST returns high.
- What happens if VCC drops below the reset threshold?
If VCC drops below the reset threshold, RST goes low and stays low for at least the reset time-out period (trec).
