STM1403ASOQ6F datasheet(7/34 Pages) STMICROELECTRONICS

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STM1403

Description

7/35

Figure 1.

Logic diagram

VREF only for STM1403A; VTPU for STM1403B/C.

Normal mode: low when VOUT is internally switched to VCC and high when VOUT is internally switched to

battery.

SAL, RST, PFO, and BLD are open drain.

Table 2.

Signal names

Note:

See Section 2: Pin descriptions on page 11 for details.

Vccsw(1)

Normal mode: low when VOUT is internally switched to VCC and high when VOUT is internally switched to

battery.

VCC switch output

Manual (push-button) reset input

PFI

Power-fail Input

TP1 - TP4

Independent physical tamper detect pins 1 through 4

VOUT

Supply voltage output

RST(2)

SAL, RST, PFO, and BLD are open drain.

Active-low reset output

PFO(2)

Power-fail output

SAL(2)

Security alarm output

BLD(2)

Battery low voltage detect

VREF

(3)

VREF only for STM1403A; VTPU for STM1403B/C.

1.237 V reference voltage

VTPU

(3)

Tamper pull-up (VCC or VBAT)

VBAT

Backup supply voltage

VCC

Supply voltage

VSS

Ground

AI09682

VCC

VBAT

STM1403

VSS

VOUT

VREF

VTPU

(1)

VCCSW

(2)

SAL(3)

BLD(3)

PFI

TP1 (NH)

TP2

(NL)

TP3

(NH)

TP4

(NL)

PFO(3)

RST(3)

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