STM802 datasheet(6/42 Pages) STMICROELECTRONICS

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Description

STM690, STM704, STM795, STM802, STM804, STM805, STM806

6/42

Doc ID 10519 Rev 9

Description

The STM690/704/795/802/804/805/806 supervisors are self-contained devices which

provide microprocessor supervisory functions with the ability to non-volatize and write-

protect external LPSRAM. A precision voltage reference and comparator monitors the VCC

input for an out-of-tolerance condition. When an invalid VCC condition occurs, the reset

output (RST) is forced low (or high in the case of RST). These devices also offer a watchdog

timer (except for STM704/795/806) as well as a power-fail comparator (except for STM795)

to provide the system with an early warning of impending power failure.

These devices are available in a standard 8-pin SOIC package or a space-saving 8-pin

TSSOP package.

Figure 1.

Logic diagram (STM690/802/804/805)

For STM804/805, reset output is active-high and open drain.

Figure 2.

Logic diagram (STM704/806)

AI08846

VCC VBAT

STM690/

802/804/

805

VSS

VOUT

RST (RST) (1)

WDI

PFI

PFO

AI08847

VCC VBAT

STM704

STM806

VSS

VOUT

RST

PFI

PFO

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