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LS7366R Counter: Technical Specifications, CAD Models, and Circuits

Author: Irene
Date: 3 Sep 2021
 140
CAD Models

The LS7366R is a 32-bit CMOS powerful decoder/counter chip which can be connected directly to a motor encoder to count encoder pulses.

Catalog

Product Overview

LS7366R CAD Models

LS7366R Circuit

LS7366R Features

LS7366R Product Attributes

LS7366R Applications

Component Datasheet

Using Warnings

LS7366R Manufacturer


Product Overview

LS7366R Counter

LS7366R Counter

LS7366R interfaces with the index signals from incremental encoders to perform variety of marker functions. For communications with microprocessors or microcontrollers, it provides a 4-wire SPI/MICROWIRE bus.
This is a breakout board based on LS7366R quadrature counter IC. The Dual LS7366R buffer board is designed to interface directly to an encoder output such as the hall-effect encoders on our IG32, IG42, and IG52 gear motors with hall effect encoder or optical encoders. Equipped with a SPI interface, the Dual LS7366R buffer board makes is simple to monitor the position of the motors, keep track of angular position, speed, total distance traveled, etc. The Dual LS7366R buffer board can be configured to work with a quadrature output or a single pulse and direction.
LS7366R can be configured to operate as 1, 2, 3 or 4-byte counter and can count in a variety of modes such as quadrature, free-running, range limit and modulo-N. Hardware I/Os are provided for event driven operations, such as processor interrupt and index related functions. If the application needs less than 32 bits transmission times can be reduced. In "modulo-n" mode the counter will remain in a given range, which can be set to the number of pulses in a full rotation so that a read from the counter will result in the exact position of the motor without need for additional calculations.
The 7366 is connected to the PIC via a 4 wire SPI bus. Three of the wires, SCK, SDI, and SDO, can be shared with other SPI devices. The /SS (slave select) line must be dedicated to the 7366. A series of communication actions results in a particular internal register being read from or written to. The registers are for control, status, and output functions. Although mostly handled by the library code, here is a description of each register:


LS7366R CAD Models

LS7366R CAD Models

LS7366R CAD Models


LS7366R Circuit

The 7366 connects to the PIC using the SPI bus, as mentioned above. As seen in the circuit to the right, the relevant wires are SCK, SDI, SDO, and SS. In the code below, the SPI1 module is used, but with slight changes the SPI2 module could be used instead. There are other optional pins that could be connected for interrupts, etc., for more information see the 7366 datasheet.
As seen in the diagram, the 7366 requires an external clock. Instead of using a crystal as shown, one could also supply an external clock pulse to the fCKI pin. For more information and frequency requirements, see the datasheet.


LS7366R Features

• Operating voltage: 3V to 5.5V (VDD - VSS)
• 5V count frequency: 40MHz
• 3V count frequency: 20MHz
• 32-bit counter (CNTR).
• 32-bit data register (DTR) and comparator.
• 32-bit output register (OTR).
• Two 8-bit mode registers (MDR0, MDR1) for programmable functional modes.
• 8-bit instruction register (IR).
• 8-bit status register (STR).
• Latched Interrupt output on Carry or Borrow or Compare or Index.
• Index driven counter load, output register load or counter reset.
• Internal quadrature clock decoder and filter.
• x1, x2 or x4 mode of quadrature counting.
• Non-quadrature up/down counting.
• Modulo-N, Non-recycle, Range-limit or Free-running modes of counting
• 8-bit, 16-bit, 24-bit and 32-bit programmable configuration synchronous (SPI) serial interface


LS7366R Product Attributes

Specifications

Values

Operating Temperature Range

-25 °C~80 °C

RoHS

Non-Compliant


LS7366R Applications

LS7366R can be used with your Arduino, mBed, Basic Micro, or any other microcontroller platform. Easily interface your motors with our encoder buffer breakout, pull-up boards and Kangaroo motion controller.
Note: The LS7366R is 3.3v tolerant but the breakout is equipped with a 40MHz oscillator. The maximum external clock speed for 3.3V operation is 20MHz. This may cause issues when attempting to run it on a 3.3V system. For optimum performance it is suggest to use a 5V supply and level shift the inputs when using a 3.3V microcontroller.
The 7366 stores a current count of the pulses, which can be read by the PIC via SPI at any time. This is in contrast with the LS7166, which uses a parallel bus to communicate with the PIC. By using the 7366, the PIC can keep track of a motor's current position without devoting any onboard resources to tracking pulses. 


Component Datasheet

LS7366R-LSI PDF


Using Warnings

Please check their parameters and pin configuration before replacing them in your circuit.


LS7366R Manufacturer

LSI Computer Systems, Inc. (LSI/CSI) began operations as the world's first fabless semiconductor company in 1969. Since its inception, LSI/CSI has been a leader in the design and production of affordable full custom and standard mixed-signal, digital and analog integrated circuits. Using a broad array of process technologies, LSI/CSI has produced ICs that extend from the consumer and industrial marketplace to military and aerospace applications. The company’s proven expertise and strong reputation have made LSI/CSI the IC provider of choice for leading manufacturers in a broad range of industries.

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