L9779WD datasheet(35/170 Pages) STMICROELECTRONICS

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L9779WD

Functional description

169

Legend:

Internal registers =

configuration registers

Interfaces driver =

control registers (OUT_DIS), LS/HS drivers, ext-MOS, IGBT

LB internal registers =

include dedicated configuration bit for Low battery drivers

LB interfaces driver =

control registers (OUT_DIS) + interface drivers logic for Low

battery drivers

MSC_ac =

MSC activity watch-dog

Smart reset logic =

include VDD5 undervoltage and some time counter (TNL,

TD_UV_RST,

THOLD)

Power-up/down manager = include the logic for regulator control and monitoring and

MRD managing.

CAN & K-LINE & VRS

Software reset sent

by the µC through

MSC

Internal registers

Interfaces drivers

LB interfaces drivers

LB internal registers

MSC_act

CAN & K-LINE & VRS

Smart reset function

Power-up/down

manager

MRD=ON

VDD5=ON

V3V3=ON

VTRACK1,2=ON

N/A

MSC activity

watch-dog

Interfaces drivers

Internal registers

LB interfaces drivers

LB internal registers

CAN & K-LINE & VRS

MSC_act

Smart reset function

Power-up/down

manager

MRD=ON

VDD5=ON

V3V3=ON

VTRACK1,2=ON

TRANS_F

Table 9. Internal reset (continued)

Event

RST

driven

low

Logic under reset

Logic not reset

Power-up/down

manager output

Information

FLAG

Table 10. RST pin external components required

Symbol

Parameter

Value

Note

RST

Rreset

Pull_up reset reference

4.7 kΩ ± 5 %

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