TLE6209R_07 Datasheet, PDF (8/30 Pages) Infineon Technologies AG – 7 A H-Bridge for DC-Motor Applications

TLE 6209 R
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.
Table 6
Functional Truth Table
DIR PWM MODE
(Bit 2)
OUT1
0
1
0
H
0
0
(slow decay) _H
1
1
L
1
0
H
0
1
1
H
0
0
(fast decay) _L
1
1
L
1
0
H
OUT2
L
H
H
H
L
H
H
L
Comments
Motor turns clockwise
Freewheel with slow decay
Motor turns counterclockwise
Freewheel with slow decay
Motor turns clockwise
Fast decay
Motor turns counterclockwise
Fast decay
Slow Decay
PWM = H
PWM = L
M
M
Fast Decay
PWM = H
PWM = L
M
M
Figure 2 DIR/PWM Control with Slow- and Fast Decay
Data Sheet, Version 3.1
8
2007-08-01