Datasheet

L6226Q Circuit description
Doc ID 14335 Rev 5 11/29
4.2 Logic inputs
Pins IN1
A
, IN2
A
, IN1
B
, IN2
B
, EN
A
and EN
B
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 EN
A
and EN
B
are commonly used to implement overcurrent and thermal protection by
connecting them respectively to the outputs OCD
A
and OCD
B
, which are open-drain
outputs. If that type of connection is chosen, some care needs to be taken in driving these
pins. Two configurations are shown in Figure 7 and Figure 8. If driven by an open drain
(collector) structure, a pull-up resistor R
EN
and a capacitor C
EN
are connected as shown in
Figure 7. If the driver is a standard push-pull structure the resistor R
EN
and the capacitor
C
EN
are connected as shown in Figure 8. The resistor R
EN
should be chosen in the range
from 2.2 kΩ to 180 kΩ. Recommended values for R
EN
and C
EN
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. EN
A
and EN
B
pins open collector driving
Figure 8. EN
A
and EN
B
pins push-pull driving
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