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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Selling LST, LS, LS with LST, LS, LS Datasheet PDF of these parts.
Views Page Discussion View source History. As mentioned above, multiple LS can be used which are connected to the same data and control lines, except for chip select, which needs to be separate for each chip. Alternatively, at each read the PIC could send back the actual count value. The code in this document only covers datasheer binary quadrature mode, and for more advanced features the support code will need to be modified.
Since this was put in the separate function, other code won’t have to be changed, other than TRIS setups. The chip can also operate in divide-by-n mode, which loads the count register with a fixed value on rollover.
Most other functions will usually not be needed unless special features are needed. In any motor-related application, binary counting is necessary. A chip with similar capability is the LSRwhich uses the SPI bus to communicate instead of in parallel, is discussed on separate wiki page.
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LS709T, LS7100, LS7166
Note that to use thethe only steps are to setup the pins, call the init function, then call the read function to get a value.
The A and B inputs normally serve as quadrature inputs, like those which come from a quadrature encoder like those on most motors. Using a parallel data ls716, a microcontroller can datasheeg read the current count value from the chip, allowing a project to interface with motor encoders without using any additional timers.
In the code below and example schematic, pins B0-B7 are used for the data bus. This c file contains various functions used to interface with the LS The chip has several other features that can be read about in the datasheet. This number datasheeet be changed based on the full rotation count of the encoder in use. All three can be download from this zip file. The init function can be modified to utilize other special features of the chip not used here. A motor’s encoder can be connected directly to the LS, which will decode and count pulses as the encoder channels change.
Because of this, the pic software must be written so that the read value of CNTR is datasjeet by the maximum count number to find the position. Note that most pins are active low, and thus must be kept at high at all times unless in use. Eventually the CNTR will overflow if not reduced.
There are also two pins datasheer output flags when programmed events occur, such as an overflow. The LS communicates with a microcontroller via a bi-directional 8-bit data bus and several control bits. For instance, if the maximum count isand CNTR isthen the actual position is out of Retrieved from ” http: The ,s7166, as mentioned above, connects to the PIC via an ps7166 data bus, 4 control bits, 2 optional control bits, and 2 optional flags.
Note that the code does not reset to 0 when it reaches PR. Note that at the end of the init function, the counter limit value is loaded into the PR register. This is useful dataeheet 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. 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.
This c file simply loops continuously and reads values from the LS For more info on these features, see the datasheet. The value of the PR register is loaded whenever the counter borrows downticks from 0. The LS is a 24 bit quadrature counter.
Because of this, if running the motor backwards continuously counting downthe le7166 of CNTR darasheet always be between 0 and PR at the current position. These pins can be changed, but the data bus read and write functions will need to be changed to datahseet with bit lines instead of bytes.