L9301 datasheet(19/54 Pages) STMICROELECTRONICS

19 / 54 page

DS11400 Rev 9

19/54

L9301

Configuration 1: 8 low side drivers

Figure 5. Configuration 2: 4 low-side PWM mode and 4 low-side drivers

7.2

Configuration 3: 4 high-side PWM mode and 4 low-side

drivers

In this configuration there are 4 high side drivers with integrated free-wheeling diodes and 4

low side drivers available. All the channels can be driven by SPI or by the parallel input. To

enable the SRC1-4 driving, the PWM enable SPI bit for SRC1-4 and OUT1-4 must be set.

The IN1-4 control the high side power SRC1-4 used to drive the LOAD1-4 and the device

assures that when the high-side is switched off, the low-side, acting as a free-wheeling

diode, must be turned on. To avoid cross conduction the HS VGS voltage is monitored.

When SRC1-4 is commanded ON either by INx or SPI, the L9301 switches off the LS first,

then with 2 µs delay after detecting LS VGS low, it switches on HS.

When SRC1-4 is commanded OFF either by INx or SPI, the L9301 switches off the HS first,

then with 2 µs delay after detecting HS VGS low, it switches on the LS.

IN5-8 control OUT5-8

The selected configuration must be configured by SPI and the wanted channel must be

enabled using pwm_en bit in the corresponding register.

The corresponding relations are:

Internal

Supply

LOGIC

SPI

Driver

OUT1-4

OUT5-8

L9301

Diagnostic

SCK

MOSI

MISO

Driver

DRN1-4

SRC1-4

Charge

pump

GND

RES

LOAD 1- 4

LOAD 5-8

VDD_I/O

IN7

IN6

IN5

IN4

IN3

IN2

V5V

IN1

IN8

HS/LS

GAPG0109151552PS

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