L9945_V01 datasheet(28/144 Pages) STMICROELECTRONICS

부품명	L9945

상세설명	Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems

PDF	144 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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5.5.1

H-Bridge driving modes

The H-Bridge must be controlled via the external NONx pins. Such inputs have different meanings while in H-

Bridge mode:

Table 16. NONx signals in H-bridge configuration

HB1

HB2

Signal description

NON1

NON5

NPWM – Negative asserted Pulse Width Modulation signal

NON2

NON6

DIR – Direction signal

NON3

NON7

HiZ – High Impedance (all FETs actively switched off, load floating)

NON4

NON8

Not used

Any attempt to control channels via SPI is ignored while H-Bridge mode is active.

In driving mode the H-bridge work according to the following table:

Table 17. Truth table

HiZ

DIR

NPWM

HBx_AFW

Load’s driving direction

X (1)

OFF

Reverse

OFF

Freewheeling (reverse)

OFF

Active freewheeling (reverse)

OFF

Forward

OFF

Freewheeling (forward)

OFF

Active freewheeling (forward)

OFF

High Impedance

1. X = don't care.

The freewheeling is performed on low side, as shown in Figure 15. Software brake mode can be performed by

setting the active freewheeling bit (HBx_AFW).

L9945

Functional description

DS12275 - Rev 10

page 28/144

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