L6208PD datasheet(13/35 Pages) STMICROELECTRONICS

13 / 35 page

DocID7514 Rev 2

13/35

L6208

Circuit description

5.2

Logic inputs

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

 to 180 K. Recommended values for R

EN and CEN are respectively 100 K and

5.6 nF. More information on selecting the values is found in Section 7.5: Non-dissipative

overcurrent protection on page 21.

Figure 9. Logic inputs internal structure

Figure 10. EN pin open collector driving

Figure 11. EN pin push-pull driving

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