A board-type program-controlled voltage bias test circuit for large-scale digital integrated circuits

Abstract

The present invention relates to a board-type program-controlled voltage pull-bias test circuit for a large-scale digital integrated circuit, comprising a power module, a first digitally controlled potentiometer, a second digitally controlled potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor, and an instruction control module, wherein the first control end of the power module is connected to the adjustable resistance end of the first digitally controlled potentiometer, the second control end of the power module is connected to the output end of the first relay, the first input end of the first relay is connected to the adjustable resistance end of the second digitally controlled potentiometer, and the first input end of the first relay is connected to the output end of the second relay. The present invention realizes the automatic control of the pull-bias voltage in the large-scale digital circuit board pull-bias test by coordinating between the power module, the digitally controlled potentiometer, the relay, the resistor, and the instruction control module, without carrying a large-volume special instrument, so the portability is better.

Description

Technical Field

[0001] The invention relates to a board-type program-controlled voltage pull-bias test circuit for a large-scale digital integrated circuit, belonging to the field of integrated circuit testing. Background Art

[0002] When large-scale digital integrated circuits are undergoing board-level electrical performance testing, verification, aging and other reliability tests, it is often necessary to perform voltage deviation tests on the circuit's core, IO, PLL and other dedicated power supply ports. The deviation voltage is generally about ±10% of the rated value in the manual. In actual tests, there are three main ways to power the circuit: (1) through a dedicated programmable power supply meter; (2) through a power module with a fixed voltage output, such as DC / DC, LDO, etc.; (3) through a power module with a variable voltage output. The above methods have the following problems in actual use:

[0003] (1) The main problem with powering with a dedicated programmable power meter is that the meter is generally large in size and weight, making it difficult to carry during testing. In particular, when the integrated circuit has more than four operating voltages (such as Xilinx 7 series FPGA, which requires VCCINT, VCCAUX, VCCAUX_IO, VCCO of different banks, VCCBRAM, VREF, MGTAVCC, MGTAVTT, MGTVCCAUX, VCCADC, and other auxiliary circuits on the board), multiple programmable power meters will be required, making it even more difficult to carry.

[0004] (2) The main problem with power supply through a power module with fixed voltage output is that the pull-bias voltage of the integrated circuit is generally about ±10% of the standard value, such as 3.3V is pulled to 3.0V and 3.6V, and 1.0V is pulled to 0.9V and 1.1V. The power module with fixed voltage output can generally only provide standard voltage outputs such as 1.0V, 1.8V, 2.5V, 3.3V, etc., and therefore cannot be used for pull-bias testing.

[0005] (3) Power modules with variable voltage output also belong to power management chip products. Their characteristics are that the voltage output value of the power module can be adjusted by connecting resistors of different resistance values ​​to their control ports. For example, TI's power module LMZ31710 can adjust the voltage output value of the power module by changing the resistors connected between the first control port and the second control port. SET With R RT Two resistor values ​​can achieve a voltage output in the range of 0.6V-5.5V and 0.1V step, such as Figure 1 , Figure 2 As shown. Since the operating voltage of general digital integrated circuits is below 5V (except for 4000 series high-voltage digital circuits), the output range of this power module can cover the pull-off test voltage range of most digital circuits.

[0006] Although the variable voltage output power module LMZ31710 and a specific resistor combination can achieve the voltage output required for the pull-off test, it is difficult to change the pull-off voltage value during the test. For example, the IO of FPGA is programmable IO, and the IO voltage is generally from 1.2V to 3.3V. The pull-off voltage corresponding to the pull-off test with different output voltages is also different. In this case, it is necessary to change R SET With R RT Whether it is reinstalling a resistor with a new resistance value or using an adjustable potentiometer, manual operation cannot be avoided and automated testing cannot be achieved. Summary of the invention

[0007] The technical problem solved by the present invention is: in order to overcome the shortcomings of the prior art, a large-scale digital integrated circuit board mode program-controlled voltage pull-bias test circuit is proposed to realize the automation of the pull-bias voltage in the large-scale digital circuit board mode pull-bias test.

[0008] The solution of the present invention is:

[0009] A large-scale digital integrated circuit board-type program-controlled voltage pull-bias test circuit includes a power module, a first digitally controlled potentiometer, a second digitally controlled potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor, and an instruction control module.

[0010] The first control end of the power module is connected to the adjustable resistance end of the first digitally controlled potentiometer, the second control end of the power module is connected to the output end of the first relay, the first input end of the first relay is connected to the adjustable resistance end of the second digitally controlled potentiometer, the first input end of the first relay is connected to the output end of the second relay, the first input end of the second relay is connected to one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected to the output end of the third relay, the first input end of the third relay is connected to one end of the second resistor, and the other end of the second resistor is grounded; the second input end of the third relay is connected to one end of the third resistor, and the other end of the third resistor is grounded;

[0011] The first control bus of the command control module is connected to the control port of the first digitally controlled potentiometer, and the second control bus of the command control module is connected to the control port of the second digitally controlled potentiometer; the control signal of the command controller is connected to the control ends of the first relay, the second relay and the third relay;

[0012] The command control module sends the configuration command of the corresponding digital potentiometer and the control command of the relay to the corresponding digital potentiometer and relay according to the voltage value required to be output by the power module; the digital potentiometer changes the resistance value of its adjustable resistor end according to the received configuration command; the relay changes its switch state according to the received control command.

[0013] Furthermore, the resistance adjustment range of the first digitally controlled potentiometer is 0.1KΩ-20KΩ.

[0014] Furthermore, the resistance adjustment range of the second digitally controlled potentiometer is 1KΩ-200KΩ.

[0015] Furthermore, the output voltage of the power module is controlled by the resistance value of a digitally controlled potentiometer or resistor connected to the first control terminal of the power module and the second control terminal of the power module.

[0016] Further, when the second control end of the power module needs to be connected to the first resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, and the first input end of the second relay to be connected to the output end.

[0017] Furthermore, when the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the first input end of the third relay to be connected to the output end.

[0018] Furthermore, when the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the second input end of the third relay to be connected to the output end.

[0019] Furthermore, when the second control end of the power module needs to be connected to the second digitally controlled potentiometer, the command control module controls the first input end of the first relay to be connected to the output end.

[0020] Furthermore, the output voltage of the power module should be generated after the resistance value connecting the first control terminal and the second control terminal thereof is determined.

[0021] Furthermore, the power module controls the output of the voltage through the power input port or the output enable port.

[0022] The beneficial effects of the present invention compared with the prior art are:

[0023] (1) Compared with the method of using a dedicated program-controlled power supply instrument to supply power for the pull-off test, the present invention realizes the automatic control of the pull-off voltage in the pull-off test of a large-scale digital circuit board through the cooperation between the power module, the digitally controlled potentiometer, the relay, the resistor and the command control module, without the need to carry a large-volume dedicated instrument, so the portability is better;

[0024] (2) Compared with the traditional board detection test, the present invention automatically controls the change of the pull-bias voltage through the command control module, without the need to manually change or adjust the resistance value of the power module, and can realize a fully automated integrated circuit automatic pull-bias test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the use method of the prior art power module LMZ31710;

[0026] Figure 2 It is the relationship between the output voltage and resistance of the prior art power module LMZ31710;

[0027] Figure 3 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the embodiments.

[0029] A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit is based on a power supply module with variable voltage output, a digitally controlled potentiometer, a relay, a resistor and an instruction control module. The instruction control module sends the configuration instruction of the corresponding digitally controlled potentiometer and the switch instruction of the relay to the corresponding digitally controlled potentiometer and the relay according to the voltage value required to be output by the power supply module; the digitally controlled potentiometer changes the resistance value of its adjustable resistor end according to the received configuration instruction; the relay changes its switch state according to the received switch instruction, thereby changing the output voltage of the power supply module, realizing the automatic control of the pull-bias voltage in the large-scale digital circuit board-type pull-bias test, and can effectively solve the problems existing in the prior art.

[0030] Specific circuits such as Figure 3 As shown, it includes a power supply module, a first digitally controlled potentiometer, a second digitally controlled potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor, and a command control module.

[0031] The first control end of the power module is connected to the adjustable resistance end of the first digitally controlled potentiometer, the second control end of the power module is connected to the output end of the first relay, the first input end of the first relay is connected to the adjustable resistance end of the second digitally controlled potentiometer, the first input end of the first relay is connected to the output end of the second relay, the first input end of the second relay is connected to one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected to the output end of the third relay, the first input end of the third relay is connected to one end of the second resistor, and the other end of the second resistor is grounded; the second input end of the third relay is connected to one end of the third resistor, and the other end of the third resistor is grounded;

[0032] The first control bus of the command control module is connected to the control port of the first digitally controlled potentiometer, and the second control bus of the command control module is connected to the control port of the second digitally controlled potentiometer; the control signal of the command controller is connected to the control ends of the first relay, the second relay and the third relay;

[0033] The command control module sends the configuration command of the corresponding digital potentiometer and the control command of the relay to the corresponding digital potentiometer and relay according to the voltage value required to be output by the power module; the digital potentiometer changes the resistance value of its adjustable resistor end according to the received configuration command; the relay changes its switch state according to the received control command.

[0034] The resistance adjustment range of the first digitally controlled potentiometer is 0.1KΩ-20KΩ, the resistance adjustment range of the second digitally controlled potentiometer is 1KΩ-200KΩ, and the output voltage of the power module is controlled by the resistance of the digitally controlled potentiometer or resistor connected to the first control end of the power module and the second control end of the power module.

[0035] When the second control end of the power module needs to be connected to the first resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, and the first input end of the second relay to be connected to the output end.

[0036] When the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the first input end of the third relay to be connected to the output end.

[0037] When the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the second input end of the third relay to be connected to the output end.

[0038] When the second control end of the power module needs to be connected to the second digitally controlled potentiometer, the command control module controls the first input end of the first relay to be connected to the output end.

[0039] The output voltage of the power module should be generated after the resistance value connected between the first control terminal and the second control terminal is determined, and the power module controls the output of the voltage through the power input port or the output enable port.

[0040] Example

[0041] This embodiment is implemented based on the power module LMZ31710, the first digitally controlled potentiometer AD5292-20 (1024 resolution / 20K resistance) and the second digitally controlled potentiometer AD5292-200 (1024 resolution / 200K resistance), and other models of similar products may also be used.

[0042] Since the standard power supply voltages of digital integrated circuits are generally 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V, etc., the output voltage range of the power module in this embodiment mainly covers the ±10% bias range of the above voltages. The voltage values ​​not listed can be designed in the same way.

[0043] Table 1 lists in detail the voltage deviation values ​​mainly covered by this embodiment, R SET With R RT It is the resistance value required to connect the first control terminal and the second control terminal of the power module; R1 / R2 / R3 are the switch states of the first / second / third relays respectively, open means the first input terminal is connected to the output terminal, and closed means the second input terminal is connected to the output terminal; the control parameter is the control instruction required for the digital potentiometer AD5292 to change the output resistance.

[0044] Table 1 Power module output voltage and digital potentiometer control parameters and relay switch status lookup table

[0045]

[0046] The following takes 1.1V voltage deviation as an example to illustrate the specific implementation method:

[0047] (1) The command control module sends a command to the first digital control potentiometer AD5292-20 through the first control bus. The control parameters are 10'd89 according to Table 1. The resistance R between the W and B ports of the first digital control potentiometer AD5292-20 WB The calculation formula of (D) is:

[0048]

[0049] Where R AB is the resistance across AB, R AB =20KΩ, control parameter D = 89, it can be calculated that R WB=1.738KΩ, that is, at this time, the first control port of the power module LMZ31710 is connected through R WB = 1.738KΩ resistor connected to ground, with standard value R SET =1.74KΩ, the error is only 0.1%.

[0050] (2) The command control module sends a control command to the relay to control the first relay (i.e., R1 in Table 1) to be closed and the second relay (i.e., R2 in Table 1) to be opened. At this time, the second control terminal of the power module LMZ31710 is connected to the ground through the first resistor with a value of 1000KΩ, which is the standard value R RT =1000KΩ consistent.

[0051] (3) The power module LMZ31710 is powered normally through the power input port, and the output voltage value of the voltage output port is 1.1V pull-up voltage.

[0052] In addition, it can be seen from Table 1 that when the required pull-bias voltage is ≥2.5V, in addition to operating the three relays, it is also necessary to operate the R of the second digitally controlled potentiometer AD5292-200. WB The control method is similar to the operation of the first digitally controlled potentiometer AD5292-20, which will not be repeated here.

[0053] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0054] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A large-scale digital integrated circuit board-type programmable voltage pull-off test circuit, characterized in that: It includes a power supply module, a first digitally controlled potentiometer, a second digitally controlled potentiometer, a first relay, a second relay, a third relay, a first resistor, a second resistor, a third resistor, and a command control module. The first control end of the power module is connected to the adjustable resistance end of the first digitally controlled potentiometer, the second control end of the power module is connected to the output end of the first relay, the first input end of the first relay is connected to the adjustable resistance end of the second digitally controlled potentiometer, the first input end of the first relay is connected to the output end of the second relay, the first input end of the second relay is connected to one end of the first resistor, and the other end of the first resistor is grounded; the second input end of the second relay is connected to the output end of the third relay, the first input end of the third relay is connected to one end of the second resistor, and the other end of the second resistor is grounded; the second input end of the third relay is connected to one end of the third resistor, and the other end of the third resistor is grounded; The first control bus of the command control module is connected to the control port of the first digitally controlled potentiometer, and the second control bus of the command control module is connected to the control port of the second digitally controlled potentiometer; the control signal of the command controller is connected to the control ends of the first relay, the second relay and the third relay; The command control module sends the configuration command of the corresponding digital control potentiometer and the control command of the relay to the corresponding digital control potentiometer and relay according to the voltage value required to be output by the power supply module; the digital control potentiometer changes the resistance value of its adjustable resistor end according to the received configuration command; the relay changes its switch state according to the received control command; The resistance adjustment range of the first digitally controlled potentiometer is 0.1KΩ-20KΩ; The resistance adjustment range of the second digitally controlled potentiometer is 1KΩ-200KΩ.

2. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 1, characterized in that: The output voltage of the power module is controlled by the resistance value of a digitally controlled potentiometer or resistor connected to the first control terminal of the power module and the second control terminal of the power module.

3. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 1, characterized in that: When the second control end of the power module needs to be connected to the first resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, and the first input end of the second relay to be connected to the output end.

4. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 1, characterized in that: When the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the first input end of the third relay to be connected to the output end.

5. A board-type program-controlled voltage bias test circuit for a large-scale digital integrated circuit as claimed in claim 1, characterized in that: When the second control end of the power module needs to be connected to the second resistor, the instruction control module controls the second input end of the first relay to be connected to the output end, the second input end of the second relay to be connected to the output end, and the second input end of the third relay to be connected to the output end.

6. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 1, characterized in that: When the second control end of the power module needs to be connected to the second digitally controlled potentiometer, the command control module controls the first input end of the first relay to be connected to the output end.

7. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 1, characterized in that: The output voltage of the power module should be generated after the resistance value connecting the first control terminal and the second control terminal thereof is determined.

8. A large-scale digital integrated circuit board-type programmable voltage pull-bias test circuit as claimed in claim 7, characterized in that: The power module controls the output voltage through the power input port or the output enable port.

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