For this feedback interface the high speed digital input 1 is used (HS_GPI1). Next table summarizes main
features of this input:
Specification Value
Number of inputs 1
Type of input ESD protected.
Differential
ESD capability IEC 61000-4-2 (ESD) ± 12 kV (air), ± 6 kV (contact)
Input impedance > 10 kΩ
High level input voltage (HS_GPI1+ - HS_GPI1-) > 150 mV
Low level input voltage (HS_GPI1+ - HS_GPI1-) < -600 mV
Recommended PWM signal for single ended 1.2 V to 24 V (HS_GPI2- connected to GND).
pk pk
Ready for 3.3 V and 5 V logic.
Recommended frequency range 500 Hz to 20 kHz
Maximum frequency range 250 Hz to 50 kHz
Maximum absolute voltage range -24 V to 24 V
Minimum detectable pulse width 200 ns
Next figure shows the circuit model for the PWM encoder input:
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