Description

LS7866 is a monolithic CMOS 32-bit counter, programmable to operate in 8-bit, 16-bit, 24-bit or 32-bit modular structures. Inputs are provided to interface directly with the quadrature clocks and the index markers from incremental encoders. The programmable modes include: X1/X2/X4 quadrature or bidirectional non-quadrature. Either of these modes can further be combined with Free-Run, Non-Recycle, Mod-N and Range-Limit modes. The functional modes are programmed via two control registers: MCR0 and MCR1. An I2 C standard serial bus in 7-bit address format is provided for communicating with the LS7866.

Features:

• Operating voltage: 3V to 5.5V
• Up to 40MHz count frequency
• Dual Mode-registers for functional programmability
• Dual 32-bit comparators
• Dual 32-bit Input Data registers for dual target counts
• 32-bit latch for counter upload
• Dual Status registers for dynamic and freeze-frame status
• Quadrature A, B and Z inputs with digital filters
• Programmable quadrature or non-quadrature input modes
• 8-bit, 16-bit, 24-bit or 32-bit programmable configurations
• Up to 400 KHz I2C clock speed
• 3 selectable address pins for up to 8 devices on the bus
• Write-All addressing mode for writing to all devices simultaneously
• 14-pin SOIC and TSSOP packages