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Dsp-based multi-channel precision programmable resistor module and its control method

A resistance module, precise technology, applied in the direction of program control, computer control, general control system, etc., can solve the problems of short service life and low integration of programmable resistance modules, and achieve the effect of long service life and high integration

Active Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low integration and short service life of traditional programmable resistor modules, the present invention further provides a DSP-based multi-channel precision programmable resistor module and its control method

Method used

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  • Dsp-based multi-channel precision programmable resistor module and its control method
  • Dsp-based multi-channel precision programmable resistor module and its control method

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the multi-channel precision programmable resistance module based on DSP described in this embodiment, it comprises RS-485 conversion circuit 1, DSP control circuit 2 and programmable resistance circuit 3;

[0024] The DSP control circuit 2 includes a DSP controller 21 and an off-chip RAM 22;

[0025] The programmable resistance circuit 3 includes a digital potentiometer unit circuit 31 and a decoding selection circuit 32;

[0026] The digital potentiometer unit circuit 31 has n channels, each channel includes a first digital potentiometer R1 and a second digital potentiometer R2, the first digital potentiometer R1 and the second digital potentiometer R2 are connected in series to form a variable resistance, n is a positive integer greater than 2;

[0027] The external data signal is connected to the signal input end of the RS-485 conversion circuit 1 through the RS-485 bus, ...

specific Embodiment approach 2

[0035] Specific embodiment two: this embodiment further limits the DSP-based multi-channel precision programmable resistance module described in specific embodiment one. In this embodiment, the address bus interface of the DSP controller 21 is a 16-bit address bus interface. The data bus interface is a 16-bit data bus interface.

specific Embodiment approach 3

[0036] Embodiment 3: In this embodiment, the DSP-based multi-channel precision programmable resistor module described in Embodiment 1 is further limited. In this embodiment, n=32.

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Abstract

The invention relates to a programmable module and a control method thereof, especially to a DSP-based multipath precise programmable resistance module and a control method thereof, which aim at solving the problems that a traditional programmable resistance module is low in integrated level and short in service life. A serial peripheral interface of a DSP is fully utilized to control a digital potentiometer to realize variable resistance output, wherein 32 paths of programmable resistance output can be reached, the output ranges from 2komega to 200komega, the resistance precision is better than 100omega, stepping is low, and the minimal stepping interval is 4omega. Miniaturization is realized; the integrated level is high, which is increased by 20%; and the service life is long, which is increased by more than one time.

Description

technical field [0001] The invention relates to a programmable module and its control method. Background technique [0002] Resistors are an essential part of almost all circuit systems, and special resistors can also be used as sensors. A change in a resistance value in a circuit system can often cause a great change in the characteristics of the circuit, and in some resistive sensors, the measured output is a variable resistance. Therefore, whether it is from the perspective of controlling circuit characteristics or simulating some special sensors, we hope to realize the programmable control of resistance. [0003] The traditional programmable resistor module is mainly composed of a resistor array and a switch array, and the switch is used to select the resistor array, so as to realize different resistor resistance output. Traditional programmable resistance modules are mainly composed of relay arrays and precision resistance arrays. Due to the large volume of relays, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
Inventor 赵光权乔立岩梁军邹吉炜易进
Owner HARBIN INST OF TECH
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