Pin connection

L6228Q

6/32

Doc ID 14321 Rev 4

Table 4.

Pin description

N°

Pin

Type

Function

1, 21

GND

GND

Ground terminals.

Power output Bridge B output 1.

11

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the current controller OFF-time of the bridge B.

12

Power supply

Bridge B source pin. This pin must be connected to power ground through a

sensing power resistor.

13

Analog input

Bridge B current controller reference voltage.

Do not leave this pin open or connected to GND.

14

HALF/FULL

Logic input

Step mode selector. HIGH logic level sets HALF STEP mode, LOW logic level

sets FULL STEP mode.

If not used, it has to be connected to GND or +5 V.

15

CONTROL

Logic input

Decay mode selector. HIGH logic level sets SLOW DECAY mode. LOW logic

level sets FAST DECAY mode.

If not used, it has to be connected to GND or +5 V.

16

EN

Chip enable. LOW logic level switches OFF all power MOSFETs of both

bridge A and bridge B. This pin is also connected to the collector of the

overcurrent and thermal protection to implement over current protection.

If not used, it has to be connected to +5 V through a resistor.

17

VBOOT

Supply

voltage

Bootstrap voltage needed for driving the upper power MOSFETs of both

bridge A and bridge B.

19

Power output Bridge B output 2.

20

Power supply

Bridge B power supply voltage. It must be connected to the supply voltage

22

Power supply

Bridge A power supply voltage. It must be connected to the supply voltage

23

Power output Bridge A output 2.

24

VCP

Output

Charge pump oscillator output.

25

RESET

Logic input

Reset pin. LOW logic level restores the home state (state 1) on the phase

sequence generator state machine.

If not used, it has to be connected to +5 V.

26

Analog Input

Bridge A current controller reference voltage.

Do not leave this pin open or connected to GND.

27

CLOCK

Logic input

Step clock input. The state machine makes one step on each rising edge.

28

CW/CCW

Logic input

Selects the direction of the rotation. HIGH logic level sets clockwise direction,

whereas LOW logic level sets counterclockwise direction.

If not used, it has to be connected to GND or +5 V.

29

Power supply

Bridge A source pin. This pin must be connected to power ground through a

sensing power resistor.

30

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the current controller OFF-time of the bridge A.

31

Power output Bridge A output 1.

1.

Also connected at the output drain of the over current and thermal protection MOSFET. Therefore, it has to be driven

putting in series a resistor with a value in the range of 2.2 k

Ω - 180 kΩ, recommended 100 kΩ