UM0759 Datasheet, PDF (17/26 Pages) STMicroelectronics – L9958 evaluation board and graphical user interface

UM0759
Table 6. EN/DI/DIR switch map
Switch
EN
DI
DIR
Forward
Break
Reverse
Break
PWM duty-cycle and frequency control
● PWM Duty-cycle control
Range:
[0, 100] %
Step:
1
Default:
50 %
Figure 15. PWM duty
General description
Bit “ACT”
“1”
“0”
“1”
“0”
Bridge status
On-state
tri-state
On-state
tri-state
● PWM frequency control
Range:
[20, 30000] Hz
Step:
1
Default:
10000Hz
Figure 16. PWM frequency control
To adjust PWM control bars will change the duty-cycle and frequency of L9958's PWM input
signal. But if the motor was freewheeling, the action clicking the control roll didn't change the
current status, PWM duty-cycle unchanged.
Doc ID 16058 Rev 2
17/26