CN111158280A - High-precision analog-to-digital converter fuse automatic burning system and method - Google Patents
High-precision analog-to-digital converter fuse automatic burning system and method Download PDFInfo
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- CN111158280A CN111158280A CN201911371005.4A CN201911371005A CN111158280A CN 111158280 A CN111158280 A CN 111158280A CN 201911371005 A CN201911371005 A CN 201911371005A CN 111158280 A CN111158280 A CN 111158280A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
A high-precision automatic fuse burning system and method for an analog-digital converter belong to the technical field of digital-analog converters. The FPGA module receives a burning control signal sent by an upper computer through a USB-to-SPI controller and burning code stream data of each fuse in a fuse array arranged according to a preset sequence, generates a control instruction and sends the control instruction to a burning module; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal; the burning module comprises a trimming code burning circuit and an ADC chip to be burnt; the trimming code burning circuit receives the control instruction and forwards the control instruction to the ADC chip to be burnt; and the ADC chip to be burned enters a burning state according to the burning control signal in the control command, the burning code stream data of the fuse wire array in the control command is sent to the receiving pin of the ADC chip to be burned according to the bit, and each fuse wire is burned by the ADC chip to be burned according to the bit, so that the burning of the whole ADC chip fuse wire array to be burned is realized.
Description
Technical Field
The invention relates to a high-precision automatic fuse burning system and method for an analog-digital converter, and belongs to the technical field of digital-analog converters.
Background
With the continuous development of electronic technology, analog-to-digital converters are becoming more and more important as interfaces for connecting analog and digital worlds. The high-precision converter has the characteristics of low power consumption, low noise, wide input range and the like, and is widely applied to a plurality of fields such as environment monitoring, digital acquisition systems, instruments and meters and the like.
A Successive Approximation Register (SAR) structure has the advantages of wide input range, low power consumption, reusability and the like, and most of high-precision analog-to-digital converters are designed based on the structure. However, in the converter production process, the actual performance of the converter is reduced due to the limitations and instability of the existing processes. Therefore, in the production and test processes of the high-precision converter, reasonable trimming means are needed to improve the conversion precision of the high-precision converter.
Fuse fusing and trimming internal capacitance is an effective trimming means for high-precision analog-to-digital converters. The principle is that whether a small capacitor connected in parallel with a main capacitor is connected is controlled by whether a fuse wire is fused or not, so that the capacitance value and the matching degree are corrected. However, in the production process of the SAR analog-to-digital converter, the capacitor of the SAR analog-to-digital converter cannot be modified by directly measuring the internal capacitor, and the capacitor value of the mismatch capacitor can only be obtained by calculation after the parameter performance is tested, and then the mismatch capacitor corresponds to a specific fuse. However, the number of fuses of the fuse array of the SAR analog-to-digital converter with the structure of more than 16 bits reaches hundreds, and each fuse is manually burned, so that not only is the time consumed, but also the burning success rate is low.
Disclosure of Invention
The technical problem solved by the invention is as follows: the system and the method can complete the automatic burning, the function test and other works of the internal fuse array of the high-precision analog-to-digital converter.
The technical solution of the invention is as follows: a high-precision analog-to-digital converter fuse automatic burning system comprises a power supply, an audio signal source, an FPGA module, a burning module, an upper computer, a USB-to-SPI controller and a logic analyzer;
the power supply is used for providing working voltage for the burning module;
the audio signal source is used for providing an analog input signal for the burning module;
the logic analyzer is used for collecting the output data of the burning module and determining whether burning is successful according to the observation data;
the FPGA module is used for receiving a burning control signal sent by the upper computer through the USB-to-SPI controller and burning code stream data of each fuse in the fuse array arranged according to a preset sequence, generating a control instruction and sending the control instruction to the burning module; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the burning module comprises a trimming code burning circuit and an ADC chip to be burnt; the trimming code burning circuit receives the control instruction and forwards the control instruction to the ADC chip to be burnt; the ADC chip to be burned enters a burning state according to a burning control signal in the control instruction, burning code stream data of the fuse wire array in the control instruction is sent to a receiving pin of the ADC chip to be burned according to bits, and each fuse wire is burned by the ADC chip to be burned according to the bits, so that the burning of the whole ADC chip fuse wire array to be burned is realized; after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer.
Further, the ADC chip to be burned is an SAR structure ADC chip with more than 16 bits.
Further, the number of the fuses of the ADC chip to be burned is not less than 324.
Further, the burning code stream data comprises retention time required for controlling the fusing of the single fuse.
A high-precision analog-to-digital converter fuse automatic burning method comprises the following steps:
receiving a burning control signal and burning code stream data of each fuse in a fuse array arranged according to a preset sequence, and generating a control instruction; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the ADC chip to be burned receives the control command, enters a burning state according to a burning control signal in the control command, and sends burning code stream data of the fuse array in the control command to a receiving pin of the ADC chip to be burned in a bit mode, each fuse is burned in the ADC chip to be burned in a bit mode, and burning of the whole ADC chip fuse array to be burned is achieved;
after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer;
the logic analyzer collects output data of the burning ADC chip and determines whether burning is successful according to the observation data.
Further, the ADC chip to be burned is an SAR structure ADC chip with more than 16 bits.
Further, the number of the fuses of the ADC chip to be burned is not less than 324.
Further, the burning code stream data comprises retention time required for controlling the fusing of the single fuse.
Compared with the prior art, the invention has the advantages that:
(1) the fuse array to be burned can be modified only by performing related operation on the fuse array input panel of the upper computer, and the fuse array to be burned has certain convenience and flexibility;
(2) the holding time required by fusing the fuse wires can be accurately controlled through the medium of the upper computer, each fuse wire needing to be fused is guaranteed to be fused, and the success rate of burning is improved;
(3) compared with a manual method for burning a single fuse wire, the automatic burning method greatly improves the production efficiency and reduces the difficulty of mass production of ADC manufacturers.
Drawings
FIG. 1 is a schematic diagram of an automatic fuse programming system of a high-precision analog-to-digital converter according to the present invention.
Fig. 2 is a schematic diagram of signal and data transmission within the system.
FIG. 3 is a schematic diagram of an input panel of the fuse array of the upper computer in the system.
FIG. 4 is a flowchart of ADC fuse auto-burn.
Detailed Description
The invention is further explained and illustrated in the following figures and detailed description of the specification.
Referring to fig. 1, 2 and 3, an automatic fuse burning system for a high-precision analog-to-digital converter comprises a power supply, an audio signal source, an FPGA module, a burning module, an upper computer, a USB-to-SPI controller and a logic analyzer;
the power supply is used for providing working voltage for the burning module;
the audio signal source is used for providing an analog input signal for the burning module;
the logic analyzer is used for collecting the output data of the burning module and determining whether burning is successful according to the observation data;
the FPGA module is used for receiving a burning control signal sent by the upper computer through the USB-to-SPI controller and burning code stream data of each fuse in the fuse array arranged according to a preset sequence, generating a control instruction and sending the control instruction to the burning module; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the burning module comprises a trimming code burning circuit and an ADC chip to be burnt; the trimming code burning circuit receives the control instruction and forwards the control instruction to the ADC chip to be burnt; the ADC chip to be burned enters a burning state according to a burning control signal in the control instruction, burning code stream data of the fuse wire array in the control instruction is sent to a receiving pin of the ADC chip to be burned according to bits, and each fuse wire is burned by the ADC chip to be burned according to the bits, so that the burning of the whole ADC chip fuse wire array to be burned is realized; after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and drawings, wherein the exemplary embodiments and descriptions of the present invention are used for explanation and illustration, but not for limitation of the present invention.
As shown in fig. 1, the invention provides an automatic fuse burning system of a high-precision analog-to-digital converter, which comprises a power supply, an audio signal source, an ADC burning board, upper computer software, a USB to SPI controller, and a logic analyzer; the ADC burning board comprises an FPGA control circuit, an ADC to be burnt and an ADC trimming code burning circuit.
A power supply in the system is responsible for providing system working voltage, an audio signal source provides analog input signals, and a logic analyzer is responsible for collecting data converted by the ADC. And after the system is powered on, the upper computer software sends a burning control signal and burning code stream data of each fuse in the fuse array to the FPGA through the USB-to-SPI controller in a sorted sequence, the FPGA controls the ADC to enter a fuse burning mode and sends burning codes of the fuse array to the ADC receiving pin in a bit-by-bit manner, and the ADC to be burned burns each fuse in a bit-by-bit manner to realize automatic burning of the whole fuse array. The fuse array is automatically burnt, the FPGA controls the ADC to be switched to a working mode, the FPGA receives output data from a data output pin of the burnt ADC, the output data are collected through the logic analyzer, and whether the burning is successful or not can be determined by observing the data.
Fig. 2 is a schematic diagram of signal and data transmission in the system, and fig. 3 is a schematic diagram of an input panel of the fuse array of the upper computer. The fuse array to be burned is input through an upper computer panel, the upper computer sends burning code stream data to the FPGA control circuit through the SPI, and the sending interval of the burning code stream data of each fuse is controlled to be more than 50ms so as to reserve sufficient transmission time for the FPGA; the FPGA writes fuse data into a register, and sends clock SCK and data CNV of an SPI protocol simulated through an FPGAI/O port to an ADC to be burned; the ADC to be burned receives data of the FPGAI/O port, and each fuse wire is burned according to a bit; the fuse array is automatically burnt, the FPGA controls the ADC to be switched to a working mode, the FPGA receives output data SDO from a data output pin of the burnt ADC through an I/O port, the output data SDO is serial data, and after serial data conversion parallel operation needs to be carried out in the FPGA according to the number of bits of the ADC, the data are collected through a logic analyzer, and whether burning is successful or not can be determined by observing the data.
Fig. 4 is a flowchart illustrating an automatic burning process of an ADC fuse, and the overall work flow of the automatic burning system of a high-precision analog-to-digital converter fuse provided by the present invention can be more intuitively understood from the diagram, which includes the following steps:
receiving a burning control signal and burning code stream data of each fuse in a fuse array arranged according to a preset sequence, and generating a control instruction; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the ADC chip to be burned receives the control command, enters a burning state according to a burning control signal in the control command, and sends burning code stream data of the fuse array in the control command to a receiving pin of the ADC chip to be burned in a bit mode, each fuse is burned in the ADC chip to be burned in a bit mode, and burning of the whole ADC chip fuse array to be burned is achieved;
after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer;
the logic analyzer collects output data of the burning ADC chip and determines whether burning is successful according to the observation data.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. A high-precision analog-to-digital converter fuse automatic burning system is characterized in that: the device comprises a power supply, an audio signal source, an FPGA module, a burning module, an upper computer, a USB-to-SPI controller and a logic analyzer;
the power supply is used for providing working voltage for the burning module;
the audio signal source is used for providing an analog input signal for the burning module;
the logic analyzer is used for collecting the output data of the burning module and determining whether burning is successful according to the observation data;
the FPGA module is used for receiving a burning control signal sent by the upper computer through the USB-to-SPI controller and burning code stream data of each fuse in the fuse array arranged according to a preset sequence, generating a control instruction and sending the control instruction to the burning module; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the burning module comprises a trimming code burning circuit and an ADC chip to be burnt; the trimming code burning circuit receives the control instruction and forwards the control instruction to the ADC chip to be burnt; the ADC chip to be burned enters a burning state according to a burning control signal in the control instruction, burning code stream data of the fuse wire array in the control instruction is sent to a receiving pin of the ADC chip to be burned according to bits, and each fuse wire is burned by the ADC chip to be burned according to the bits, so that the burning of the whole ADC chip fuse wire array to be burned is realized; after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer.
2. The system of claim 1, wherein the fuse of the adc further comprises: the ADC chip to be burned is an SAR structure ADC chip with more than 16 bits.
3. The system of claim 2, wherein the fuse of the adc further comprises: the number of the fuses of the ADC chip to be burned is not less than 324.
4. The system of claim 1, wherein the fuse of the adc further comprises: and the burning code stream data comprises retention time required for controlling the fusing of the single fuse.
5. A high-precision analog-to-digital converter fuse automatic burning method is characterized by comprising the following steps:
receiving a burning control signal and burning code stream data of each fuse in a fuse array arranged according to a preset sequence, and generating a control instruction; the control instruction comprises a burning control signal, burning code stream data of the fuse array and a working control signal;
the ADC chip to be burned receives the control command, enters a burning state according to a burning control signal in the control command, and sends burning code stream data of the fuse array in the control command to a receiving pin of the ADC chip to be burned in a bit mode, each fuse is burned in the ADC chip to be burned in a bit mode, and burning of the whole ADC chip fuse array to be burned is achieved;
after the fuse array is burned, the ADC chip to be burned receives the working control signal and enters a working state, and the FPGA module receives output data of the ADC chip to be burned after burning, parallels the output data and sends the output data to the logic analyzer;
the logic analyzer collects output data of the burning ADC chip and determines whether burning is successful according to the observation data.
6. The method of claim 5, wherein the method comprises: the ADC chip to be burned is an SAR structure ADC chip with more than 16 bits.
7. The method of claim 6, wherein the method comprises: the number of the fuses of the ADC chip to be burned is not less than 324.
8. The method of claim 5, wherein the method comprises: and the burning code stream data comprises retention time required for controlling the fusing of the single fuse.
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| CN201911371005.4A CN111158280B (en) | 2019-12-26 | 2019-12-26 | High-precision analog-to-digital converter fuse automatic burning system and method |
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| CN111158280B (en) | 2021-09-21 |
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