L6227Q datasheet(11/27 Pages) STMICROELECTRONICS

11 / 27 page

L6227Q

Circuit description

11/27

4.2

Logic inputs

Pins IN1A, IN2B, IN1B and IN2B 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 Vthon = 1.8 V and Vthoff = 1.3 V.

Pins ENA and ENB have identical input structure with the exception that the drains of the

Overcurrent and thermal protection MOSFETs (one for the bridge A and one for the

bridge B) are also connected to these pins. Due to these connections some care needs to

be taken in driving these pins. The ENA and ENB inputs may be driven in one of two

configurations as shown in Figure 7 or Figure 8. If driven by an open drain (collector)

structure, a pull-up resistor REN and a capacitor CEN are connected as shown in Figure 7. If

the driver is a standard push-pull structure the resistor R

EN and the capacitor CEN are

connected as shown in Figure 8. The resistor R

EN 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 5.6 nF.

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

Figure 6.

Logic inputs internal structure

Figure 7.

ENA and ENB pins open collector driving

Figure 8.

ENA and ENB pins 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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