Quadrature Counter from LSI Computer Systems
LSI Computer Systems Inc.
May 6, 2009
The LS7566R from LSI Computer Systems Inc., Melville, NY, is an incremental encoder interface IC that extracts position data from the quadrature outputs of up to 4 encoder units. The input quadrature clocks from encoders are digitally filtered. Each input channel features a 24-bit up/down counter, 24-bit input register and 24-bit comparator for target position, 24-bit output register, 4-bit shared global interrupt mask register, and 2 control registers. Configurable modes and functions include quadrature/nonquadrature input clock, enhanced quadrature clock resolution, modulo-n/nonrecycle/free-run counting, limit switch emulation, and Z-track-based programmable index and maskable output marker flags.
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