STM805SM6E

Supervisors Overview

The STM805SM6E is a microprocessor supervisor IC from STMicroelectronics, designed for 3 V systems with automatic battery switchover capabilities. It provides essential supervisory functions including non-volatile memory protection and write-protection for external LPSRAM. The device features a precision voltage reference and comparator to monitor the VCC input, forcing the reset output low upon detecting out-of-tolerance conditions. Key electrical parameters include a typical supply current of 40 μA and a low battery supply current of 0.4 μA. It offers a typical watchdog timer period of 1.6 seconds and a typical recovery time (trec) of 200 ms. The reset assertion is guaranteed down to VCC = 1.0 V. Operating temperature range is –40 °C to +85 °C.

Supervisors Feature Summary

• Provides microprocessor supervisory functions with automatic battery switchover for system continuity.
• Includes NVRAM supervisor capability to non-volatize and write-protect external LPSRAM.
• Features a power-fail comparator for early warning of impending power failure.
• Integrates a watchdog timer to ensure system integrity during software faults.

Supervisors Applications

• Microprocessor reset circuits in industrial control systems
• Battery-powered embedded devices requiring seamless power source switching
• Systems utilizing external LPSRAM that require data preservation during power events

Supervisors Procurement Notes

Verify the specific suffix 'SM6E' against the manufacturer's latest datasheet to confirm package type and tape/reel specifications. Ensure the 3 V variant matches the system voltage requirements, as other variants exist for different voltage levels. Confirm RoHS compliance status and lead-free component certification if required by regulatory standards. Check for any obsolescence notices or lifecycle status updates directly from STMicroelectronics before finalizing procurement.

Supervisors Selection Notes

Select this component when a 3 V operating voltage is required alongside automatic battery switchover functionality. It is suitable for applications needing NVRAM protection and watchdog timer integration within a single supervisor IC. Consider the 8-pin SOIC package availability and the industrial temperature range suitability for the target environment. Compare against other STM80x series variants if different voltage thresholds or feature sets like chip-enable gating are needed.

Supervisors Part Context

The STM805SM6E belongs to the STM80x family of supervisors, which also includes variants for 5 V systems (STM805L). These devices share common architectural features such as precision voltage monitoring, watchdog timers, and NVRAM protection capabilities. The family is designed to provide robust microprocessor supervision in compact packages, supporting both standard SOIC and space-saving TSSOP form factors for various PCB layout constraints.

Supervisors FAQ

Does the STM805SM6E support automatic battery switchover?

Yes, the STM805SM6E is specifically designed with automatic battery switchover functionality to maintain system operation during power transitions.

What is the minimum VCC level for reset assertion?

The reset output is guaranteed to assert down to a VCC level of 1.0 V.