Multi-channel parameter measurement unit

Abstract

The utility model aims to provide the multi-channel parameter measurement unit which is convenient to integrate in production test equipment and is small in occupied space and low in cost. The device comprises a first connection module (1), a PMU module (2), a power supply module (3), an acquisition module (4), a communication level conversion module (5) and a second connection module (6), a plurality of measurement channels of the PWU module are connected with a product to be tested through the first connection module (1), and the acquisition module (4) is connected with a plurality of output channels of the PWU module. The acquisition module (4) is in communication connection with the communication level conversion module (5), and the communication level conversion module (5) communicates with external control equipment through the second connection module (6). The circuit parameter measuring device is applied to the technical field of circuit parameter measurement.

Description

Technical Field

[0001] The utility model is applied to the technical field of circuit parameter measurement, and particularly relates to a multi-channel parameter measurement unit. Background Art

[0002] In circuit design and production, it's often necessary to test the operation of electronic devices. This is typically done with a Source Measure Unit (SMU). Its high precision and microampere-level sensitivity make SMUs particularly valuable in applications requiring high-precision power supply and measurement resolution. For example, when testing electronic devices, SMUs can source voltages less than 1mV and currents less than 1uA, which are crucial for accurately measuring their performance.

[0003] Conventional SMU instruments have only a single channel and are standard instrument products. They are bulky and expensive. They are not suitable for use in production test equipment, and the number of channels is not scalable.

[0004] If a multi-channel parameter measurement unit that is easy to integrate into production test equipment, occupies a small space, and is low in cost can be provided, the problem that existing parameter measurement is not compatible with batch testing can be well solved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a multi-channel parameter measurement unit which is easy to integrate into production test equipment and has small space occupation and low cost.

[0006] The technical solution adopted by the present invention is: the present invention includes a first connection module, a PMU module, a power supply module, an acquisition module, a communication level conversion module and a second connection module. Several measurement channels of the PMU module are connected to the product to be tested through the first connection module, the acquisition module is connected to several output channels of the PMU module, the acquisition module is communicatively connected to the communication level conversion module, and the communication level conversion module communicates with an external control device through the second connection module.

[0007] As can be seen from the above scheme, the PMU module performs multi-channel parameter measurement while the acquisition module performs data acquisition and conversion for each channel. After the conversion is completed, the processed data is fed back to the external control device through the communication level conversion module, wherein the first connection module is used to provide a connection port for connecting the product to be tested and the measurement channel of the PMU module, and the second connection module is used for communication between the PMU module, the power supply module, the communication level conversion module and the external control device, thereby feeding back measurement data and inputting control instructions. Compared with traditional SMU instruments, the present invention realizes the acquisition of parameters of the product to be tested and provides multi-channel measurement at the same time through the cooperation of the above modules, thereby improving measurement efficiency and convenience while reducing equipment costs.

[0008] A preferred solution is that the present invention also includes an IO expansion module, and several test channels of the PMU module are respectively connected to the test ports on the first connection module through several relays, and the control ports of all the relays are correspondingly connected to several IO ports of the IO expansion module, and the IO expansion module communicates with the external control device through the second connection module.

[0009] A preferred solution is that the communication level conversion module includes a first level converter and a second level converter, the acquisition module communicates with the SPI port of the second connection module through the first level converter, the data output port of the acquisition module is connected to the output port of the second connection module through the second level converter, and the SPI port and output port of the second connection module both communicate with the external control device.

[0010] A preferred solution is that the present invention further includes a storage module, which communicates with an external control device through the second connection module and feeds back parameter data.

[0011] A preferred solution is that the power supply module includes a first DAC and a second DAC, the input ends of the first DAC and the second DAC are electrically connected to the external control device through the second connection module, and the output ends of the first DAC and the second DAC are connected to a power supply chip, which outputs an operating voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a system connection block diagram of the utility model. DETAILED DESCRIPTION

[0013] like Figure 1As shown, in this embodiment, the present invention includes a first connection module 1, a PMU module 2, a power supply module 3, an acquisition module 4, a communication level conversion module 5, and a second connection module 6. The PMU module 2's multiple measurement channels are connected to the product under test via the first connection module 1. The acquisition module 4 is connected to the PMU module 2's multiple output channels. The acquisition module 4 is in communication with the communication level conversion module 5, and the communication level conversion module 5 communicates with an external control device via the second connection module 6. The product under test is the electronic device to be measured, and the external control device is a computer or control board. Both the first connection module 1 and the second connection module 6 are adapter interfaces, each equipped with multiple connection terminals for connector connection, enabling quick connection. The PMU module includes an AD5522 parameter measurement chip and provides four independent channel PMU module circuits. Each single-pin parameter measurement unit (PPMU) channel includes five 16-bit voltage-output DACs, which can set programmable input levels for the drive voltage input, clamp input, and comparator input (high and low). Five programmable drive and measure current ranges are available, ranging from ±5 μA to ±80 mA. Four of these ranges use on-chip sense resistors; a higher current output range of up to ±80 mA per channel is also available using off-chip sense resistors. The PMU's functions are controlled via a simple three-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards.

[0014] In this embodiment, the utility model also includes an IO expansion module 7, and several test channels of the PMU module 2 are respectively connected to the test ports on the first connection module 1 through several relays, and the control ports of all the relays are connected to several IO ports of the IO expansion module 7. The IO expansion module 7 communicates with the external control device through the second connection module 6. By setting the IO expansion module 7 to communicate with the host computer and obtain the control instructions of the measurement channel, the relays of the corresponding measurement channels are controlled to be on and off through several IO ports, thereby realizing the activation and closure of the measurement channel. The IO expansion module 7 includes an IO expansion chip with model CAT9555YFI-T2, and the SCK port and SDA port of the IO expansion module 7 are connected to the I2C bus of the second connection module 6.

[0015] In this embodiment, the communication level conversion module 5 includes a first level converter and a second level converter. The acquisition module 4 communicates with the SPI port of the second connection module 6 via the first level converter. The data output port of the acquisition module 4 is connected to the output port of the second connection module 6 via the second level converter. Both the SPI port and the output port of the second connection module 6 communicate with an external control device. The SPI port of the PMU module 2 is connected to the SPI port of the second connection module 6. The first level converter is a bidirectional level converter model TXS0104EPWR, and the second level converter is an 8-bit non-inverting converter chip model TXS0108EPWR.

[0016] In this embodiment, the present invention further includes a storage module 8, which communicates with the external control device via the second connection module 6 and feeds back parameter data. The storage module 8 is a CAT24C64YI-GT3 memory chip, which is used to store calibration parameters. The external control device reads the calibration parameters to calibrate the measurement results.

[0017] In this embodiment, the power supply module 3 includes a first DAC and a second DAC. The input ends of the first DAC and the second DAC are both electrically connected to an external control device via the second connection module 6. The output ends of the first DAC and the second DAC are both connected to a power chip, which outputs an operating voltage. The first DAC and the second DAC are both MCP4725A0T-E / CH digital-to-analog converters, and the power chip is LT8364. The first DAC and the second DAC cooperate with the power chip connected to them to output a specific operating voltage. The external control device adjusts the output voltage to meet the operating requirements of each chip and provides the voltage signal required for measurement.

[0018] Although the embodiments of the present invention are described with practical solutions, they do not limit the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. Multi-channel parameter measurement unit, characterized by: It comprises a first connection module (1), a PMU module (2), a power supply module (3), an acquisition module (4), a communication level conversion module (5) and a second connection module (6), wherein a plurality of measurement channels of the PMU module (2) are connected to the product to be tested via the first connection module (1), the acquisition module (4) is connected to a plurality of output channels of the PMU module (2), the acquisition module (4) is communicatively connected to the communication level conversion module (5), and the communication level conversion module (5) communicates with an external control device via the second connection module (6).

2. The multi-channel parameter measurement unit according to claim 1, characterized in that: It also includes an IO expansion module (7), wherein the plurality of test channels of the PMU module (2) are respectively connected to the test ports on the first connection module (1) through a plurality of relays, and the control ports of all the relays are correspondingly connected to the plurality of IO ports of the IO expansion module (7), and the IO expansion module (7) communicates with an external control device through a second connection module (6).

3. The multi-channel parameter measurement unit according to claim 1, wherein: The communication level conversion module (5) comprises a first level converter and a second level converter, the acquisition module (4) communicates with the SPI port of the second connection module (6) via the first level converter, the data output port of the acquisition module (4) is connected to the output port of the second connection module (6) via the second level converter, and both the SPI port and the output port of the second connection module (6) communicate with an external control device.

4. The multi-channel parameter measurement unit according to claim 1, wherein: It also includes a storage module (8), which communicates with an external control device through the second connection module (6) and feeds back parameter data.

5. The multi-channel parameter measurement unit according to claim 1, wherein: The power supply module (3) comprises a first DAC and a second DAC, the input ends of the first DAC and the second DAC are electrically connected to an external control device via the second connection module (6), and the output ends of the first DAC and the second DAC are connected to a power chip, which outputs an operating voltage.

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