BQ79600-Q1_V01 datasheet(34/71 Pages) TI

部品番号	BQ79600-Q1

部品情報	BQ79600-Q1 Automotive SPI/UART Communication Interface Functional-Safety Compliant With Automatic Host Wakeup

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7.3.5 Sniff Detector

Note

Sniff detector is only used if reverse wakeup feature is used.

Sniff detector, powered by AVAOREF, is used to detect fault tone from stack device on COMH* or COML*. This

detector would trigger if it detects/counts no less than nVALIDATE of continuous couplets (either “-” or “+”) with

amplitude larger than VVAL_THR. If any couplet timing interval is larger than tSNIFFIDLE, detector/counter is reset.

This sniff detector rejects HB tone since nVALIDATE is more than 30, both HB/Fault tone are “-” tone; detector

doesn’t expect “+” tone.

Note

The usage assumption of this detector is when system is in idle mode, BQ79600-Q1 in SHUTDOWN.

Sniff detector is only effective in SHUTDOWN. Once detector is triggered, device transitions from SHUTDOWN

to VALIDATE. The sniff detector is by default disabled when first transition from COMPLETE OFF to

SHUTDOWN. To enable the feature, host has to keep [SNIFDET_EN] = ‘1’ & [SNIFDET_DIS] = ‘0’ before

transitioning to SHUTDOWN. After enabling the detector, if device doesn’t transition to COMPLETE OFF, the

only way to disable the detector is to keep [SNIFDET_DIS] = ‘1’. (Disable bit has higher priority so don’t care

about the setting of [SNIFDET_EN]) before transitioning to SHUTDOWN.)

BQ79600-Q1

SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020

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