STM1404 Ver la hoja de datos (PDF) - STMicroelectronics

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componentes Descripción

Fabricante

STM1404

3 V FIPS-140 security supervisor with battery switchover

STMicroelectronics 

Description

STM1404

Note:

Figure 2.

QFN16 connections

BLD(2) PFI VCCSW(1) VCC

RST(2)

MR

SAL(2)

VSS

16 15 14 13

1

12

2

11

3

4

56

10

7

89

VOUT

VBAT

PFO(2)

VREF or VTPU(3)

TP1 TP2 TP3 TP4

(NH) (NL) (NH) (NL)

AI09683

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

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

battery.

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

3. VREF only for STM1404A; VTPU for STM1404B/C.

Figure 3. Block diagram

VCC

BAT54J(1,2)

VBAT(1)

MR

PFI

VSO

COMPARE

VINT VRST COMPARE

VPFI

COMPARE

VDET

COMPARE @

POWER-UP

1.237V VREF

Generator

VHV

COMPARE

VLV

TP1 (NH)

TP2 (NL)

TP3 (NH)

TP4 (NL)

COMPARE

High Temp.

Sense

TA > TH

Low Temp.

Sense

TA < TL

VOUT

trec

Generator

VCCSW

RST(3)

PFO(3)

BLD(3)

VTPU(4)

VREF(4)

SAL(3)

AI09684a

1. Required for battery-reverse charging protection

2. User supplied

3. Open drain

4. VREF only for STM1404A; VTPU for STM1404B/C

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