AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 200)

Page 200 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Idle PW Output – Option assigning pin GPIO5 to the Idle Control output function
Idle PW Frequency – The period in microseconds assigned to this output pin.
1 microsecond = 0.000001 seconds or 1 x 10
-6
seconds
33000 x 1 x 10 -6 seconds = 0.033 seconds
Frequency = 1 / Period so:
1/0.033 = 30.3 Hz
These setting would configure the EMS to output a 30 Hz duty cycle switched ground output on
pin GPIO5.
GPIO5 40/64Mhz
– Scaling option sometimes used to allow much higher frequency output
signals. Default is OFF.
Note that a power cycle is necessary for these settings to take effect.