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Product ReleaseNew Low Cost Precision Stepper Motor Controller for Bipolar and Unipolar Motors by LSI/CSI
 LSI/CSI announces the availability of its new high performance stepper motor controller integrated circuit, designated LS7290. “A huge advantage for our customers is that the low cost LS7290 can replace the expensive L297 in most applications, while providing more programmable micro-steps” according to Pete Visconti, VP Sales and Marketing. This new IC is capable of a large selection of step sizes ranging between full and 1/32 step. The LS7290 is designed to control two-phase bipolar stepper motors or four-phase unipolar stepper motors with minimum burden on the resources of a host micro-controller. For bipolar motors, the LS7290 interfaces with an external Dual Full Bridge Driver such as the L298, which contains a pair of H-bridges driven by the LS7290 PWM and Phase Control outputs. The H-bridges allow for the selection of wide range of motor sizes. For unipolar motors, the LS7290 PWM and Phase Control outputs interface with four AND gates driving four NMOS driver transistors. Inputs to the LS7290 are available to control the step size, step command, motor direction, over-current sense, over-current threshold and inter-step phase drive blanking delays. The programmable inter-step blanking delays allow for delay selection to suit a specific motor resulting in reduced audible motor noise, increased step accuracy, and reduced power dissipation. The basic timing clock can be supplied either from the built-in oscillator or from the system clock. LS7290 features include:
Pricing at 1,000 pieces is $1.15. The complete Data Sheet for this device, as well as all of our Standard Products, can be found by visiting our Web Site. For more information, including price quotes and technical assistance, please contact us. In addition to its line of Stepper Motor Controllers, LSI/CSI has a line of Brushless DC Motor Controls and other standard product ICs. LSI/CSI has been producing turnkey, Mixed-Signal Full Custom ICs for a broad range of industries since 1969. ABOUT LSI COMPUTER SYSTEMS, INC. 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. |
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LSI/CSI introduces LS7566R, the latest addition to its incremental encoder interface family of ICs. It provides an efficient hardware solution for extracting position data directly from the quadrature outputs of as many as four encoder units. The input quadrature clocks from encoders are digitally filtered for elimination of noise and errors arising out of encoder dither, providing high level of reliability. Communications to host processors are facilitated by a 3-state octal bus and an interrupt protocol with selections from a pool of marker flags.
The LS7166 is a programmable quadrature counter IC providing an efficient hardware solution for acquiring position data directly from incremental encoders. Acting as a peripheral device, it can relieve the host processor of the time intensive task of tracking the encoder motion clock by clock, allowing the computational resources to be allocated for processing the collected data. The IC is programmable to function in several counting and input/output modes, configurable by four write accessible mode control registers. A 3-state octal bus facilitates communication with host processors. LS7166 includes the following features: • 24-bit up/down counter for accumulating encoder positional data • 24-bit input register along with its companion 24-bit comparator for target position
The LS7541 is a cost-effective Step Dimmer CMOS IC capable of producing one, three or four-step lighting sequences. The LS7541 is a new addition to a family of Lighting Control ICs offered by LSI/CSI, a Melville, NY Company. The LS7541 is the main component for built-in or screw-in touch-adapter lamp modules that convert any metallic part of a lamp to a touch pad for control of lighting intensity. The AGC (Automatic Gain Control) feature of the LS7541 allows the modules to convert any size lamp to touch control, independent of line plug polarity. The touch-adapter modules provide lamp owners with ease of use and energy savings while eliminating the need for costly multi-filament bulbs. Touch-adapter modules compatible with 50Hz/60Hz AC Line frequencies and any AC Line voltage can be produced using the LS7541.
The LS7366 is an Integrated Circuit for decoding and counting quadrature clocks directly from Incremental Encoders. It provides for a dedicated solution to position and displacement tracking at 40x106/sec line rate (at 5V) from the encoder and a count limit of 232. Its serial interface (SPI) greatly reduces the required IO wire count as compared to a parallel bus structure. It can also operate with non-quadrature clock signals and provides various counting modes for signal conditioning. The LS7366 operates over the voltage range of 3V to 5.5V.
Programming of the LS7366 and all communications between itself and a host controller are made with four simple instructions: READ_reg, WRITE_reg, LOAD_reg and CLEAR_reg. The functional modes are controlled with two bytes of data written into two on-chip Mode Registers.
The configurable modes are:
-Quadrature/non-quadrature count inputs
-Quad cycle resolution selection by factor of x1, x2 or x4
