Switch matrix driving circuit and method

Abstract

The invention discloses a switch matrix driving circuit and a method. The switch matrix driving circuit comprises a CPLD (Complex Programmable Logic Device) chip and relay driving chips, wherein the CPLD chip is used for receiving a command transmitted by a bus interface, and decoding the received command; the relay driving chips are connected with the CPLD chip through a circuit, and used for receiving the command decoded by the CPLD chip and performing decoding through an address data SEL (System Event Log) to selectively output a valid bit in order to control a corresponding relay to act; M groups of relay driving chips are provided; any group of relay driving chips comprises N driving chips; the driving chips in the same group share one chip selection (CS); nth chips in different groups share one switch level signal LVL; all the driving chips share one address data SEL; and n is less than or equal to N. The switch matrix driving circuit has the beneficial effects that the driving circuit is designed reasonably, and the groups share a control signal, so that the problem of wrong operation caused by sharing of the control signal is effectively solved; the design integration degree of the switch matrix is increased; and the demand on miniaturization design of automatic test equipment is met.

Description

technical field [0001] The invention relates to the field of switch matrix control, in particular to a switch matrix driving circuit and method. Background technique [0002] Currently, existing switch matrix control methods such as figure 1 As shown, the driver chip has no data selection function, so the number of SEL signals can only drive the same number of relays, and it is difficult to effectively simplify the driving circuit. The control signal of the driver chip corresponds to the driver chip one by one and cannot be shared. For each additional driver chip, the corresponding chip selection and switch level control signals need to be added. The main control chip needs to allocate many more pins to control these driver chips. [0003] The traditional large-scale switch matrix, due to the variety and complexity of relays and control circuits, is difficult to realize the miniaturization of the device, takes up a lot of space resources, and is not conducive to the constru...

AI Technical Summary

Problems solved by technology

[0003] Traditional large-scale switch matrix, due to the variety and complexity of relays and control circuits, it is difficult to realize the miniaturization of the device, occupying a lot of space resources, which is not conducive to the construction of automatic test systems

[0004] In the traditional switch matrix device, the control line is directly connected to the relay array after being boosted and expanded by the driver. In order to achieve precise control of the switch channel, all control signals of the drive circuit need to be controlled by a separate control signal line, which takes up a lot of space. Board-level resources make the expandable space of the switch matrix very small, and it is difficult to adapt to the test requirements of rapid development

[0005] The traditional switch matrix control method cannot reasonably share the control signals of the driver chip, and the sharing of control signals will cause a large number of relay misoperations, which cannot realize precise control of signal transmission and routing, and cannot guarantee the switching and routing of signal input and output in the test system

[0006] In the traditional switch matrix control method, when it is necessary to maintain the control signal state of a relay, the control signal state of the corresponding driver chip must be maintained. During long-term operation, the power loss caused is very large, and it is not conducive to the heat dissipation of the device.

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