LTC2954 Просмотр технического описания (PDF) - Linear Technology

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LTC2954

Pushbutton On/Off Controller with µP Interrupt

Linear Technology 

LTC2954

APPLICATIONS INFORMATION

t1

PB

tDB, ON

t2

t3

t4

PB & KILL IGNORED

tKILL, ON BLANK

ONT

tONT

PDT

INT

KILL XXX DON'T CARE

t5

t6

t7 t8

t9

PB IGNORED

tDB, OFF

tPD, MIN

t < tPDT

μP DRIVES

KILL LOW

EN

2954 F01

Figure 1. Simplified Power On/Off Sequence for LTC2954-1. μP Asserts KILL After an Interrupt

tABORT

PB

tDB,ON + tONT

512ms

INTERNAL

TIMER

POWER-ON

TIMING

EN

POWER

TURNED OFF

μP FAILED TO SET

KILL HIGH

KILL

2954 F02

Figure 2. KILL Remaining Low Aborts Power-On Sequence for LTC2954-1

2954fb

10

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