L9301 datasheet(18/54 Pages) STMICROELECTRONICS

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Configuration 1: 8 low side drivers

L9301

18/54

DS11400 Rev 9

7.1

Configuration 2: 4 low-side PWM mode and 4 low-side drivers

In this configuration there are 4 low 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 OUT1-4 driving, the PWM enable SPI bit for OUT1-4 and SRC1-4 must be set.

The IN1-4 control the low side power OUT1-4 used to drive the LOAD1-4 and the device

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

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

When OUT1-4 are commanded ON 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 LS.

When OUT1-4 are commanded OFF 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 the HS.

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:

Table 15. Config 2

INx

SPI: CR13

Output

IN1

Cmd1

OUT1 <-> SRC2

IN2

Cmd2

OUT2 <-> SRC1

IN3

Cmd3

OUT3 <-> SRC4

IN4

Cmd4

OUT4 <-> SRC3

IN5

Cmd5

OUT5

IN6

Cmd6

OUT6

IN7

Cmd7

OUT7

IN8

Cmd8

OUT8

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