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STM802S
(Rev.:2004)

3V Supervisor with Battery Switchover

STMicroelectronics 

STM690/704/795/802/804/805/806

SUMMARY DESCRIPTION

The STM690/704/795/802/804/805/806 Supervi-

sors are self-contained devices which provide mi-

croprocessor supervisory functions with the ability

to non-volatize and write-protect external

LPSRAM. A precision voltage reference and com-

parator monitors the VCC input for an out-of-toler-

ance 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 2. Logic Diagram (STM690/802/804/805)

VCC VBAT

Figure 4. Logic Diagram (STM795)

VCC VBAT

WDI

PFI

STM690/

802/804/

805

VOUT

RST(RST)(1)

PFO

VCCSW

E

STM795

VOUT

RST

ECON

VSS

AI08846

Note: 1. For STM804/805, reset output is active-high and open

drain.

Figure 3. Logic Diagram (STM704/806)

VCC VBAT

VOUT

MR

STM704

RST

PFI

STM806

PFO

VSS

AI08847

VSS

AI08848

Table 2. Signal Names

MR

Push-button Reset Input

WDI

Watchdog Input

RST

Active-Low Reset Output

RST(1)

Active-High Reset Output

E(2)

Chip Enable Input

ECON(2)

Conditioned Chip Enable Output

Vccsw(2)

VCC Switch Output

VOUT

Supply Voltage Output

VCC

Supply Voltage

VBAT

Back-up Supply Voltage

PFI

Power-fail Input

PFO

Power-fail Output

VSS

Ground

Note: 1. Open drain for STM804/805 only.

2. STM795

4/31

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