L6235Q datasheet(10/33 Pages) STMICROELECTRONICS

10 / 33 page

Circuit description

L6235Q

10/33

Doc ID 018997 Rev 2

4.2

Logic inputs

Pins FWD/REV, BRAKE, EN, H1, H2 and H3 are TTL/CMOS and µC 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.

Pin EN (enable) may be used to implement overcurrent and thermal protection by

connecting it to the open collector DIAG output. If the protection and an external disable

function are both desired, the appropriate connection must be implemented. When the

external signal is from an open collector output, the circuit in Figure 7 may be used. For

external circuits that are push-pull outputs the circuit in Figure 8 may be used. The resistor

REN should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended values for REN

and CEN are respectively 100 kΩ and 5.6 nF. More information for selecting the values can

be found in Section 4.7.

Figure 6.

Logic inputs internal structure

Figure 7.

EN pins open collector driving

Figure 8.

EN pins push-pull driving

AM02560v1

ESD

PROTECTION

AM02561v1

OPEN

COLLECTOR

OUTPUT

REN

CEN

DIAG

ESD

PROTECTION

AM02562v1

PUSH-PULL

OUTPUT

REN

CEN

DIAG

ESD

PROTECTION

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