L9788 datasheet(110/264 Pages) STMICROELECTRONICS

No. de pieza	L9788

Descripción Electrónicos	Multifunction IC for automotive engine management system

PDF	264 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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110 / 264 page

High/low-side drivers - STARTER STR[1:3]

L9788

110/264

DS12308 Rev 4

Figure 42. OFF state diagnostic HS config

Figure 43. High-side driver OFF state fast pull down current behavior

By default diagnostic pull up/down currents are disabled and comparator outputs are

masked by internal logic, to enable OFF state diagnostic the channel must be put first in

tristate condition and then (if not already done with previous MSC frames) diagnostic must

be enabled. Once the desired channel is put in tristate a false diagnostic can be sensed due

to the time needed to discharge output voltage through the load.

A Filter Time (Diag Filter Time) is implemented in order to avoid detecting false diagnosis as

shown in Figure 44.

GADG0512160753PS

Normal function

Open Load

Short toVB

VOUTOPEN

VOUTOPEN max

VOUTOPENmin

1.9V

V_OUTx

(high-side)

VHVTmin

V-OL_THmax

Open Load

GADG0512160803PS

I_diag

I_HS_PD1+I_HS_PD2

I_HS_PD2

Tflt_diagoff1

Voutx

Tflt_diagoff1

VHVT

I_diag

I_HS_PD1+I_HS_PD2

I_HS_PD2

Tflt_diagoff1

Voutx

Tflt_diagoff1

VHVT

L9788 Datasheet(PDF) 110 Page - STMicroelectronics

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