LS datasheet, LS circuit, LS data sheet: LSI – BIT QUADRATURE COUNTER,alldatasheet, datasheet, Datasheet search site for Electronic. LSI LS 30 available from 2 distributors. Explore LSI on Octopart: the fastest source for datasheets, pricing, specs and availability. The LSI Computer Systems LS is a CMOS, bit counter that can be programmed to operate in several View the Manufacturer’s Datasheet. Features.
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For more info on these features, see the datasheet. Views Page Discussion View source History.
The following is a list of registers and the general use of each, even though they are already handled by the code written in a later section. Note that the code does not reset to 0 when it reaches PR. These pins can be changed, but the data bus read and write functions will need to be changed to interface with bit lines instead of bytes.
The A and B inputs normally serve as quadrature inputs, like those which come from a quadrature encoder like ratasheet on most motors. Alternatively, at each read the PIC could send back the actual count value.
Using the LS7166 Quadrature Counter
In the code below and example schematic, pins B0-B7 are used for the data bus. Retrieved from ” http: For instance, if the maximum count isand CNTR isthen the actual position is out of The init function can be modified to utilize other special features of the chip not used here. The LS is a 24 bit quadrature counter. The LS communicates with a microcontroller via a bi-directional 8-bit datashete bus and several control bits.
This c file simply loops continuously and reads values from the LS Most other functions will usually not be needed unless special features are needed.
Since this was put in the separate function, other code won’t have to be changed, other than TRIS setups.
(PDF) LS7166 Datasheet download
Because of this, the pic software must be written so that the read value of CNTR is modded by the maximum count number to find the position.
Note that at the end of the init function, the counter limit value ddatasheet loaded into the PR register. In any motor-related application, binary counting is necessary. Note that to use thethe only steps dataseet to setup the pins, call the init function, then call the read function to get a value.
The chip can also operate in divide-by-n mode, which loads the count register with a fixed value on rollover. The LS, as mentioned above, connects to the PIC via an 8-bit data bus, 4 control bits, 2 optional control bits, and 2 optional flags. Personal tools Log in. Note that most pins are active low, and thus must be kept at high at all times unless in use. All three can be download from this zip file.
LS Datasheet(PDF) – LSI Computer Systems
Eventually the CNTR will overflow if not reduced. Using a parallel data bus, a microcontroller can simply read the current count value from the chip, allowing a project to interface with motor encoders without using any additional timers. The value of the PR register is loaded whenever the counter borrows downticks from 0.
As mentioned above, multiple LS can be used which are connected to the same data and control lines, except for chip datasheeet, which needs to be separate for each chip. This ratasheet useful for motor applications, since the fixed value can be set to the number of pulses in a full rotation, and then whenever the count value is read, the exact position of the motor can be known no matter the amount of time that has passed since the last read.
This number should be changed based on the full rotation count of the encoder in use. Ls166 are also two pins which output flags when programmed events occur, such as an overflow. The chip has several other features that can be read about in the datasheet. The code in this document only covers divide-by-n binary quadrature mode, and for more advanced features the vatasheet code will need to be modified. A motor’s encoder can be connected directly to the LS, which will decode and count pulses as the encoder channels change.
This c file contains various functions used to interface with the LS Because of this, if running the motor datashet continuously counting downthe value of CNTR will always be between 0 and PR at the current position. A chip with similar capability is the LSR daasheet, which uses the SPI bus to communicate instead of in parallel, is discussed on separate wiki page.