78 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x
5.4 SSI encoder/sensor interface
MIS34x / MIS43x / SMC85 :
The interface for these devices is different, primarily because of the data validation func-
tion.
Field: “Number of Data bits”
Selects the number of data bits in each SSI transfer. The valid range is 1 to 31.
Set this value according to the actual SSI device connected. Please consult the data sheet
for the actual SSI device concerning which value to be used.
Field: “Clock frequency”
Selects the maximum clock speed in units of 10 kHz. The valid range is 1 to 255, corre-
sponding to 10 kHz to 2.55 MHz.
Set this value according to the actual SSI device connected. Please consult the data sheet
for the actual SSI device concerning which value to be used.
Field: “Prepare time” (Clk to Data)
A typical SSI device needs a so called prepare time to sample the position data before
transfer. This field is dedicated to type in the prepare time in micro seconds at the start
of an SSI transfer. The valid range is 1 to 255, corresponding to 1 to 255 micro seconds.
Set this value according to the actual SSI device connected. Please consult the data sheet
for the actual SSI device concerning which value to be used.
Field “Max. sample deviation”
Selects the maximum allowed deviation between two samples. The valid range is 1 to
8191. This function is ment to be an extra safety to avoid invalid reading of position data
caused by noise influencing the signal. Please bear in mind that if the external SSI device
is tracking the position of something that moves the value and thereby the deviation from
one sample to the next can be significant.
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