Notes And Tips On Signal Conditioning - dSPACE DS1104 Hardware Installation And Configuration

Signal Connection to External Devices
132

Notes and Tips on Signal Conditioning

The following notes and tips are intended to help you achieve
optimum results using the incremental encoder interface:
Recognizing Encoder Index Interrupts: see below
Connecting Encoders on page 133
Supplying Power to Encoders on page 135
Noise, crosstalk and inductive effects can degrade the signal and
lead to incorrect results if you do not provide correct shielding. For
details refer to Shielding on page 150.
Recognizing Encoder Index Interrupts
To allow the interrupt controller to recognize incoming index interrupts
(IDX1, IDX2), the input of the index interrupts must be kept low for at
least 1 µs. The interrupt is activated by the low to high transition of
the signal. The signal must remain high for at least 100 ns after the
transition from low to high.
high
low
DS1104 Hardware Installation and Configuration
T T
low high
March 2004
T : 100 ns
high min
: 1 µs
T
low min
t