Datasheet

TLE 6209 R
Data Sheet, Version 3.1 8 2007-08-01
2.3.3 Direction and PWM
The power stages are controlled by the direct inputs DIR and PWM as given in Table 6
and further illustrated in Figure 2. The DIR input gives the direction of output current,
while the PWM input controls whether the current is increased or reduced. The SPI
control bit 2 sets the decay mode, i.e. determines what happens if PWM = L. In pulse-
width modulated applications, this control scheme allows to supply the PWM-signal
always through the same port, using less controller resources.
Figure 2 DIR/PWM Control with Slow- and Fast Decay
Table 6 Functional Truth Table
DIR PWM MODE
(Bit 2)
OUT1 OUT2 Comments
010
(slow decay)
H L Motor turns clockwise
0 0 H H Freewheel with slow decay
1 1 L H Motor turns counterclockwise
1 0 H H Freewheel with slow decay
011
(fast decay)
H L Motor turns clockwise
0 0 L H Fast decay
1 1 L H Motor turns counterclockwise
1 0 H L Fast decay
MM
PWM = H PWM = L
MM
PWM = H PWM = L
Slow Decay
Fast Decay