Circuit description

L6228Q

12/32

Doc ID 14321 Rev 4

4.2

Logic inputs

Pins CONTROL, HALF/FULL, CLOCK, RESET and CW/CCW are TTL/CMOS and

microcontroller compatible logic inputs. The internal structure is shown in Figure 9. Typical

value for turn-on and turn-off thresholds are respectively V

Pin EN (Enable) has identical input structure with the exception that the drain of the

Overcurrent and thermal protection MOSFET is also connected to this pin. Due to this

connection some care needs to be taken in driving this pin. The EN input may be driven in

one of two configurations as shown in Figure 10 or Figure 11. If driven by an open drain

Figure 10. If the driver is a standard Push-Pull structure the resistor R

C

from 2.2 k

Ω to 180 kΩ. Recommended values for R

5.6nF. More information on selecting the values is found in the overcurrent protection

section.

Figure 9.

Logic inputs internal structure

Figure 10.

EN pin open collector driving

Figure 11.

EN pin push-pull driving

5V

D01IN1329

ESD

PROTECTION

5V

5V

OPEN

COLLECTOR

OUTPUT

EN

D01IN1330

ESD

PROTECTION

5V

PUSH-PULL

OUTPUT

EN

D01IN1331

ESD

PROTECTION