LS7866-S

Counter Dividers Overview

The LS7866 is a monolithic CMOS 32-bit quadrature counter featuring an I2C interface. It supports operating voltages from 3V to 5.5V and count frequencies up to 30MHz. The device includes dual 32-bit comparators, input data registers for target counts, and a 32-bit latch for counter upload. It offers programmable configurations of 8-bit, 16-bit, 24-bit, or 32-bit modular structures with selectable X1/X2/X4 quadrature or bi-directional non-quadrature modes.

Counter Dividers Feature Summary

• Supports quadrature A, B, and Z inputs with digital filters for noise suppression and decoding.
• Features dual status registers providing dynamic and freeze-frame status capabilities.
• Includes three selectable address pins allowing up to eight devices on the bus.
• Provides write-all addressing mode for simultaneous writing to all connected devices.

Counter Dividers Applications

• Incremental encoder interface applications
• Quadrature counting systems
• Multi-axis motion control

Counter Dividers Procurement Notes

Verify the specific package type required, as the LS7866 is available in 14-pin SOIC and TSSOP packages. Confirm that the system design accommodates the standard I2C protocol requirements, including necessary pull-up resistors for the SDA and SCL lines. Ensure the host controller supports the 7-bit address format utilized by this component for proper communication.

Counter Dividers Selection Notes

Select the LS7866 when a high-resolution 32-bit counter with integrated quadrature decoding is needed. It is suitable for designs requiring flexible modular bit-width configurations ranging from 8 to 32 bits. Consider this part for applications needing multiple counters on a single I2C bus using selectable address pins.

Counter Dividers Part Context

The LS7866 belongs to a family of programmable counters designed for precise position tracking. It integrates directly with incremental encoders, handling both quadrature and non-quadrature signals. The device simplifies system architecture by combining counting logic, comparison functions, and serial communication into a single CMOS chip.

Counter Dividers Replacement Considerations

LS7466: 24-bit programmable quadrature counter with SPI interface.

Counter Dividers FAQ

What are the supported count modes?

The LS7866 supports Free-Run, Non-Recycle, Range-Limit, and Modulo-n modes in both quadrature and non-quadrature configurations.

How is the device addressed on the I2C bus?

It uses a 7-bit address format where the four high-order bits are fixed at 1110, and the three low-order bits are determined by external address pins A2, A1, and A0.