STM704 datasheet(10/42 Pages) STMICROELECTRONICS

10 / 42 page

Description

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

10/42

Doc ID 10519 Rev 9

1.1.9

E (chip enable input)

The input to the chip enable gating circuit. Connect to ground if unused.

1.1.10

ECON (conditional chip enable)

ECON goes low only when E is low and reset is not asserted. If ECON is low when reset is

asserted, ECON will remain low for 15 µs or until E goes high, whichever occurs first. In the

disabled mode, ECON is pulled up to VOUT.

1.1.11

VBAT (backup battery input)

When VCC falls below VSO, VOUT switches from VCC to VBAT. When VCC rises above VSO +

hysteresis, VOUT reconnects to VCC. VBAT may exceed VCC. Connect to VCC if no battery is

used.

Table 3.

Pin description

Name

Function

STM795

STM690

STM802

STM704

STM806

STM804

STM805

—

Push-button reset input

—

WDI

Watchdog input

—

RST

Active-low reset output

—

RST

Active-high reset output

—

PFI

Power-fail input

—

PFO

Power-fail output (push-pull)

VOUT

Supply output for external LPSRAM

VCC

Supply voltage

—

Vccsw

VCC switch output (push-pull)

VSS

Ground

—

Chip enable input

—

ECON

Conditioned chip enable output

VBAT

Backup battery input

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