L6228Q datasheet(12/32 Pages) STMICROELECTRONICS

12 / 32 page

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

th(ON)= 1.8 V and Vth(OFF)= 1.3 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

(collector) structure, a pull-up resistor REN and a capacitor CEN are connected as shown in

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

EN and the capacitor

EN are connected as shown in Figure 11. The resistor REN should be chosen in the range

from 2.2 k

Ω to 180 kΩ. Recommended values for R

EN and CEN are respectively 100 kΩ and

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

D01IN1329

ESD

PROTECTION

OPEN

COLLECTOR

OUTPUT

REN

CEN

D01IN1330

ESD

PROTECTION

PUSH-PULL

OUTPUT

REN

CEN

D01IN1331

ESD

PROTECTION

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