Sabertooth Dual 25A Motor Driver User's Guide
Switch 6: 4x sensitivity
If switch 6 is in the UP position, the input signal range is
from 0V to 5V, with a zero point of 2.5V.
If switch 6 is in the DOWN position, 4x sensitivity mode is
enabled. In this mode, the input signal range is from
1.875V to 3.125V, with a zero point of 2.5V. This is useful
for building analog feedback loops
Note on using filtered PWM in Analog
Mode
If you are using a filtered PWM signal from a
microcontroller to generate the analog voltage, an R/C filter
with component values 10k ohms and at least .1uf is
recommended as shown in Figure 4.1. Using a larger value
filter capacitor such as 1uf or 10uf will result in smoother motor operation, at a cost of slower
transient response. A PWM frequency higher than 1000Hz is recommended.
Custom Analog Voltage Range – DEScribe software
Utilizing the DEScribe software, it is now possible to define your own voltage ranges for the
analog input option. After opening the DEScribe software, click on the Analog tab. You will
see the screen shown below:
Once you have your ranges set, all you have to do is connect your Sabertooth 2x25 to a USB-to-
TTL serial adapter and press Program!
Switch 6: 4x sensitivity
Figure 4.1: Filtered PWM