Matrix Orbital PK202-24-USB - Manual (Page 28)

Table 13: PWM Base Frequencies
Index Frequency Steps
0 0.3 Hz 256
1 0.6 Hz 256
2 1.2 Hz 256
3 2.4 Hz 256
4 4.8 Hz 256
5 9.6 Hz 256
6 19.1 Hz 256
7 38.2 Hz 256
8 76.3 Hz 256
9 152.6 Hz 129
10 305.2 Hz 65
11 610.4 Hz 33
12 1220.7 Hz 17
13 2441.4 Hz 9
14 4882.9 Hz 5
15 9765.8 Hz 3
As the frequency increases,the number of valid PWM states will decrease. For example, with an index
of 14, there are only 5 PWM states.
Table 14: Example PWM Values for Index =14
Input PWM Actual PWM
0 0
1- 63 25%
64 -127 50%
128 -191 75%
192 -255 100%
Frequencies in the range of 9.6Hz to 38.2Hz are desirable for fan control as they minimize the noise due
to PWM modulation. For visual applications such as controlling cold cathode lights, PWM frequencies of
76.3Hz to 305.2Hz are desirable to minimize flicker.
5.2.7 Remember PWM Base Frequency (254 197 [index])
NOTE This command was added in Firmware Version 2.1. It is not present in previous
versions.
Matrix Orbital PK202-24-USB 24