STM704 datasheet(9/43 Pages) STMICROELECTRONICS

9 / 43 page

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

Description

Doc ID 10522 Rev 10

9/43

1.1.5

VOUT

When VCC is above the switchover voltage (VSO), VOUT is connected to VCC through a P-

channel MOSFET switch. When VCC falls below VSO, VBAT connects to VOUT.

1.1.6

VBAT

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.

1.1.7

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

1.1.8

ECON

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.

1.1.9

PFI

When PFI is less than VPFI or when VCC falls below 2.4 V (or VSO), PFO goes low;

otherwise, PFO remains high. Connect to ground if unused.

1.1.10

PFO

When PFI is less than VPFI, or VCC falls below 2.4 V (or VSO), PFO goes low; otherwise,

PFO remains high. Leave open if unused. Output type is push-pull.

STM704 数据表(PDF) 9 Page - STMicroelectronics