L6229Q datasheet(12/28 Pages) STMICROELECTRONICS

12 / 28 page

Circuit description

L6229Q

12/28

Doc ID 15209 Rev 3

5.2

Logic inputs

Pins FWD/REV, BRAKE, EN, H1, H2 and H3 are TTL/CMOS and microcontroller compatible

logic inputs. The internal structure is shown in Figure 6. 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 10 kΩ and

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

section.

Figure 6.

Logic inputs internal structure

Figure 7.

Pin EN open collector driving

Figure 8.

Pin EN push-pull driving

D01IN1329

ESD

PROTECTION

OPEN

COLLECTOR

OUTPUT

REN

CEN

DIAG

D02IN1378

ESD

PROTECTION

PUSH-PULL

OUTPUT

REN

CEN

D02IN1379

DIAG

ESD

PROTECTION

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