Overview
The STM708SDS6F is a microprocessor supervisor device manufactured by STMicroelectronics. It is designed to provide essential supervisory functions for microprocessors, ensuring reliable operation under various conditions. The device includes a precision voltage reference and comparator to monitor the VCC input for out-of-tolerance conditions, triggering reset outputs as necessary.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | 8-pin TSSOP |
| Supply Voltage Range | 1.0 V to 5.5 V |
| Reset Threshold Voltage | VRST (dependent on specific device version) |
| Reset Timeout Period | 200 ms (typical) |
| Watchdog Timer | 1.6 s (typical), available in some versions |
| Manual Reset Input | Active-low input with internal pull-up |
| Power-Fail Comparator | Power-fail input/output for undervoltage detection |
| Supply Current | 40 µA (typical) |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Precision Voltage Reference and Comparator: Monitors VCC for out-of-tolerance conditions and asserts reset outputs accordingly.
- Reset Outputs: Active-low and active-high reset outputs available, depending on the device version.
- Watchdog Timer: Detects out-of-control MCU conditions with a 1.6 s typical timeout period (available in some versions).
- Manual Reset Input: Active-low input with an internal pull-up, can be driven from TTL or CMOS logic lines or shorted to ground with a switch.
- Power-Fail Comparator: Provides undervoltage detection with power-fail input/output.
- Low Supply Current: Typical supply current of 40 µA.
Applications
- Microprocessor Systems: Ensures reliable operation by monitoring supply voltage and detecting out-of-control conditions.
- Embedded Systems: Suitable for use in various embedded systems requiring robust supervisory functions.
- Industrial Control Systems: Provides essential supervisory functions in industrial control environments.
- Automotive Electronics: Can be used in automotive systems to ensure reliable operation under varying conditions.
Q & A
- What is the primary function of the STM708SDS6F?
The primary function of the STM708SDS6F is to provide microprocessor supervisory functions, including monitoring the supply voltage and asserting reset outputs when necessary.
- What types of reset outputs are available on the STM708SDS6F?
The device offers both active-low and active-high reset outputs, depending on the specific version.
- How does the watchdog timer function in the STM708SDS6F?
The watchdog timer detects out-of-control MCU conditions by monitoring the watchdog input (WDI). If WDI does not toggle within 1.6 s, the watchdog output (WDO) is asserted.
- What is the purpose of the power-fail comparator in the STM708SDS6F?
The power-fail comparator is used for undervoltage detection, signaling a failing power supply by comparing the power-fail input (PFI) to an internal reference voltage.
- What is the typical supply current of the STM708SDS6F?
The typical supply current is 40 µA.
- What is the operating temperature range of the STM708SDS6F?
The operating temperature range is -40°C to 85°C.
- How does the manual reset input work on the STM708SDS6F?
The manual reset input is an active-low input with an internal pull-up. It can be driven from TTL or CMOS logic lines or shorted to ground with a switch.
- What happens when VCC falls below the reset threshold voltage?
When VCC falls below the reset threshold voltage, the reset output is asserted low (or high, depending on the device version) and remains low until VCC rises above the threshold.
- Can the watchdog function be disabled on the STM708SDS6F?
Yes, the watchdog function can be disabled by allowing the WDI pin to float or by tri-stating the driver connected to WDI.
- What package types are available for the STM708SDS6F?
The device is available in an 8-pin TSSOP package.
