L6207Q datasheet(11/27 Pages) STMICROELECTRONICS

11 / 27 page

DocID018993 Rev 3

11/27

L6207Q

Circuit description

5.2

Logic inputs

Pins IN1A, IN2A, IN1B and IN2B are TTL/CMOS and µC compatible logic inputs. The internal

structure is shown in Figure 6. Typical values for turn-on and turn-off thresholds are

respectively Vth(ON) = 1.8 V and Vth(OFF) = 1.3 V.

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

overcurrent and thermal protection MOSFETs (one for bridge A and one for bridge B) are

also connected to these pins. Due to these connections, some care must be taken in driving

these pins. Two configurations are shown in Figure 7 and 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 REN and the capacitor

CEN are connected, as shown in Figure 8. The resistor REN should be chosen in the range

from 2.2 k

 to 180 k. Recommended values for REN and CEN are respectively 100 k and

5.6 nF. More information on selecting the values is found in Section 5.5.

Figure 6. Logic inputs internal structure

Figure 7. ENA and ENB pins open collector driving

Figure 8. ENA and ENB pins push-pull driving

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