STM817MM6F(2006) 查看數據表（PDF） - STMicroelectronics

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STM817MM6F
(Rev.:2006)

5V Supervisor with Battery Switchover

STMicroelectronics 

STM690A/692A/703/704/802/805/817/818/819

SUMMARY DESCRIPTION

The STM690A/692A/703/704/802/805/817/818/

819 Supervisors are self-contained devices which

provide microprocessor supervisory functions with

the ability to non-volatize and write-protect exter-

nal LPSRAM. A precision voltage reference and

comparator monitors the VCC input for an out-of-

tolerance condition. When an invalid VCC condi-

tion occurs, the reset output (RST) is forced low

(or high in the case of RST). These devices also

offer a watchdog timer (except for STM703/704/

819) as well as a power-fail comparator (except for

STM818) 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 (STM690A/692A/802/

805/817)

VCC VBAT

WDI

PFI

STM690A/

692A/802/

805/817

VOUT

RST(RST)(1)

PFO

VSS

AI07894

Note: 1. For STM805, reset output is active-high.

Figure 3. Logic Diagram (STM703/704/819)

VCC VBAT

VOUT

MR

PFI

STM703/

704/819

RST

PFO

VSS

AI07895

Figure 4. Logic Diagram (STM818)

VCC VBAT

WDI

E

STM818

VOUT

RST

ECON

VSS

AI07896

Table 2. Signal Names

MR

Push-button Reset Input

WDI

Watchdog Input

RST

Active-Low Reset Output

RST

Active-High Reset Output

E(1)

Chip Enable Input

ECON(1)

Conditioned Chip Enable 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. STM818

4/37

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