DocID7514 Rev 2

13/35

L6208

Circuit description

35

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

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

 to 180 K. Recommended values for R

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