Overview
The STM706M6F is a microprocessor supervisor IC produced by STMicroelectronics. It is part of the STM705/706/707/708/813L family, designed to provide essential supervisory functions for microprocessors. This device monitors the VCC input voltage and asserts a reset signal if the voltage falls below a specified threshold. It also includes features such as a watchdog timer and a power-fail comparator to ensure system reliability and early warning of impending power failure.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 5 V |
| RST Threshold | 4.25 V to 4.50 V (typical) |
| Reset Output | Active-low (RST) and Active-high (RST) |
| Reset Time-out (trec) | 200 ms (typical) |
| Watchdog Timer | 1.6 s (typical) |
| Manual Reset Input (MR) | Active-low with internal pull-up |
| Power-fail Comparator | PFI/PFO |
| Supply Current | 40 μA (typical) |
| Operating Temperature | –40 °C to 85 °C (industrial grade), –40 °C to 125 °C (automotive grade) |
| Package | 8-pin SOIC or 8-pin TSSOP |
| RoHS Compliance | Lead-free components, compliant with RoHS directive |
Key Features
- Precision VCC monitor to detect out-of-tolerance conditions
- Watchdog timer to monitor system activity (1.6 s typical)
- Manual reset input (MR) with internal pull-up
- 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 STM706M6F is suitable for various industrial and automotive applications where reliable microprocessor supervision is critical. It can be used in systems requiring robust power monitoring, such as:
- Industrial control systems
- Automotive electronics
- Embedded systems
- Power management systems
Q & A
- What is the primary function of the STM706M6F?
The primary function of the STM706M6F is to provide microprocessor supervisory functions, including monitoring the VCC input voltage and asserting a reset signal if the voltage falls below a specified threshold.
- What are the typical reset threshold values for the STM706M6F?
The typical reset threshold values for the STM706M6F are between 4.25 V and 4.50 V.
- Does the STM706M6F have a watchdog timer?
Yes, the STM706M6F includes a watchdog timer that triggers a reset if the watchdog input (WDI) remains high or low for 1.6 seconds.
- How does the manual reset input (MR) work?
The manual reset input (MR) is an active-low input with an internal pull-up. When MR is taken low, the reset output is asserted and remains low for the reset time-out period (trec) after MR returns high.
- What is the purpose of the power-fail comparator (PFI/PFO)?
The power-fail comparator provides an early warning of impending power failure by monitoring the PFI input and asserting the PFO output if PFI is below a certain threshold.
- What is the typical supply current of the STM706M6F?
The typical supply current of the STM706M6F is 40 μA.
- What are the operating temperature ranges for the STM706M6F?
The operating temperature ranges for the STM706M6F are –40 °C to 85 °C for industrial grade and –40 °C to 125 °C for automotive grade.
- Is the STM706M6F RoHS compliant?
Yes, the STM706M6F is RoHS compliant with lead-free components.
- In what packages is the STM706M6F available?
The STM706M6F is available in 8-pin SOIC and 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 the reset output low for the reset time-out period (trec). After this interval, the reset output returns high.
