CN208314772U - A kind of analog input device based on expansible serial bus system - Google Patents

Abstract

The utility model relates to a kind of analog input devices based on expansible serial bus system, described device connects host by expansible serial bus interface, the expansible serial bus system includes 5 universal serial bus (clock line CLK, downlink data line MOSI, upstream data line MISO, piece selects control line CS, address selection line CSA), the host is connected to one end of 5 cables by interface, the host is connected by MOSI line with analog input device, the analog input device includes node selection logic module, ADC unit, amplifier analog switch and power supply.The utility model is connected using MOSI line daisy topology connection type with host, and multiple input units are accessed in extended serial bus, are not limited by quantity, and can be accessed simultaneously with other expansion modules simultaneously, is saved cost, is easy to use flexibly.

Description

A kind of analog input device based on expansible serial bus system

Technical field

The utility model relates to a kind of analog input devices more particularly to a kind of based on expansible serial bus system Analog input device belongs to electronic circuit technology field.

Technical background

Primary processor realizes the functions such as data calculating, the storage of a certain amount of signal acquisition, data in general SCM system, But the resource in most systems inside these single-chip microcontrollers is not able to satisfy the demand of system, needs to carry out respective extension, such as existing Some RAM, EEPROM, F1ashROM, A/D converter, D/A converter, LED display driver, I/O interface chip, when real-time Clock, UART transceiver etc..External module generally uses bus mode to carry out module extension, and bus is divided into universal serial bus and parallel Bus, universal serial bus is lower relative to parallel bus data bandwidth, but bus cable negligible amounts are easily designed, a large amount of It is stored applied to various data, data acquisition, the fields such as motion control.How low cost, conveniently, each function mould of flexible expansion Block becomes the main problem of functions of the equipments dynamic expansion.

Therefore, it for disadvantages described above, needs effectively to innovate the prior art.

Utility model content

To overcome above-mentioned the deficiencies in the prior art, the utility model aim is the provision of a kind of based on expansible serial total The analog input device of linear system system, it is intended to which realization can access multiple input units in extended serial bus, not counted Amount limitation, and can be accessed simultaneously with other expansion modules simultaneously, cost is saved, be easy to use flexible purpose.

In order to achieve the above object, the utility model takes following technical scheme:

A kind of analog input device based on expansible serial bus system, including host module, bus module, simulation Input unit and AM access module are measured, host module is connected by physical interface with expansible universal serial bus, expansible universal serial bus It is internally provided with piece and selects control line, piece selects control line side to be provided with address selection line, and address selection line side is provided with clock Line, clock line side are provided with upstream data line, and upstream data line side is provided with downlink data line, and expansible universal serial bus is logical It crosses electrical interface to be connected with analog input device, analog input device is connected with AM access module by electric wire, and analog quantity is defeated Enter device and be internally provided with node selection logic module, the output end of node selection logic module by transfer wire with ADC module, analog switch input terminal be separately connected, the output end of the analog switch is poor by transfer wire and at least one set Divide and turn single-ended connection, the output end of the analog switch is also connected with the output end of input module, inside analog input device Each module is connected with power supply.

Preferably, it is provided with several output ports on the analog input device, passes through MOSI between output port Line electrical connection.

Preferably, bus module is to select control line by clock line CLK, downlink data line MOSI, upstream data line MISO, piece CS, address selection line CSA composition.

Preferably, node selects logic module that electric signal is transferred to ADC module and analog switch mould by spi bus Block.

Preferably, the analog input device internal data calculates in such a way that filtering calculates.

Compared with prior art, the utility model has the following beneficial effects: this analog input device is external expansion devices, It is connected using MOSI line daisy topology connection type with host, multiple input units is accessed in extended serial bus, no It is limited, and can be accessed simultaneously with other expansion modules simultaneously by quantity, saved cost, be easy to use flexibly.

Detailed description of the invention

Fig. 1 is the utility model connection status diagram；

Fig. 2 is the utility model structure diagram.

Specific embodiment

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to the accompanying drawing to this reality It is further described in detail with the specific embodiment of new embodiment.It should be appreciated that specific embodiment described herein It is only used to explain the utility model, is not used to limit the utility model.

It should be noted that it can be directly to when an element is known as " being connected to " another element Another element may be simultaneously present centering elements.

It should also be noted that, the orientation such as left and right, upper and lower in the utility model embodiment are used for, it is only opposite each other Concept or be reference with the normal operating condition of product, and should not be regarded as restrictive.

As shown in Figure 1, being a kind of analog quantity based on expansible serial bus system of the utility model specific embodiment Input unit,

A kind of analog input device based on expansible serial bus system, including host module 1, bus module 2, mould Analog quantity input unit 8 and AM access module 9, host module 1 are connected by physical interface with expansible universal serial bus 2, expansible string Row bus 2 is internally provided with piece and selects control line 3, and piece selects 3 side of control line to be provided with address selection line 4,4 side of address selection line It is provided with clock line 5,5 side of clock line is provided with upstream data line 6, and 6 side of upstream data line is provided with downlink data line 7, Expansible universal serial bus 2 is connected by electrical interface with analog input device 8, as shown in Fig. 2, analog input device 8 is logical It crosses electric wire and is connected with AM access module 9, analog input device 8 is internally provided with node selection logic module 84, the node choosing The output end for selecting logic module 84 is separately connected by transfer wire and the input terminal of ADC module 83, analog switch 82, the mould The output end of quasi- switch 82 turns single-ended 81 at least one set of difference by transfer wire and connect, the output end of the analog switch 82 Also it is connected with the output end of AM access module 9, the 8 each module in inside of analog input device is connected with power supply 85.

In specifically used operating process, host module 1 first passes through expansible universal serial bus 2 and sends out to analog input device 8 Data acquisition instructions are sent, then analog input device 8 starts to acquire each road voltage, and posts it again after completing aluminium foil and calculating Indicate in storage, is accessed convenient for host by expansion bus.

Inside analog input device 8, node selection logic module 84 is responsible for node selection on identification universal serial bus 2 and is referred to The differentiation of order, after the node is selected, analog input device 8 belonging to the node is responsible for passing the signal on universal serial bus 2 It is handed to host module 1, while receiving the signal of host module 1, is sent it on expansible universal serial bus 2, external difference turns Single-ended 81 handle the signal received by amplifier, are converted into single-ended analog signal, access amplifier analog switch 82, amplifier mould Quasi- switch 82 selects different analog channels to be input to ADC unit 83 according to the configuration information of spi bus.

Specifically, several output ports are provided on the analog input device 8 as shown in Figure 1, output port it Between be electrically connected by MOSI line.

The MOSI line is connected by daisy topology connection type with host.This connection type simulates the present apparatus i.e. Measuring input unit 8 can each be connected containing multiple by spi bus, to realize in extended serial bus 2 Multiple input units are accessed, are not limited by quantity, and can be accessed simultaneously with other expansion modules simultaneously, cost is saved, makes Use convenient, flexible purpose.

Specifically, as shown in Figure 1, bus module 2 is by clock line CLK5, downlink data line MOSI7, upstream data line MISO6, piece select control line CS3, address selection line CSA4 to form.

Specifically, node selects logic module 84 that electric signal is transferred to ADC module 83 and analog switch by spi bus 82 modules.

Specifically, the analog input device internal data calculates in such a way that filtering calculates.

This analog input device is external expansion devices, using MOSI line daisy topology connection type and host phase Even, multiple input units are accessed in extended serial bus, are not limited by quantity, and can be same with other expansion modules simultaneously When access, save cost, be easy to use flexibly.

The above-mentioned description to embodiment is for the ease of those skilled in the art it will be appreciated that and using this Case technology, person skilled in the art obviously can make various modifications to these examples easily, and described herein one As principle be applied in other embodiments without having to go through creative labor.Therefore, this case is not limited to above embodiments, ability According to the disclosure of this case, the improvement and modification made for this case all should be in the protection scopes of this case by the technical staff in domain.

Claims (5)

1. a kind of analog input device based on expansible serial bus system, it is characterised in that: including host module, bus Module, analog input device and AM access module, host module is connected by physical interface with expansible universal serial bus, expansible Universal serial bus is internally provided with piece and selects control line, and piece selects control line side to be provided with address selection line, and address selection line side is set It is equipped with clock line, clock line side is provided with upstream data line, and upstream data line side is provided with downlink data line, expansible string Row bus is connected by electrical interface with analog input device, and analog input device is connected with AM access module by electric wire, Analog input device is internally provided with node selection logic module, and the output end of the node selection logic module passes through transmission The input terminal of conducting wire and ADC module, analog switch is separately connected, and the output end of the analog switch is by transfer wire and at least One group of difference turns single-ended connection, and the output end of the analog switch is also connected with the output end of input module, analog input dress Internal each module is set to be connected with power supply.

2. a kind of analog input device based on expansible serial bus system according to claim 1, feature exist In: it is provided with several output ports on the analog input device, is electrically connected between output port by MOSI line.

3. a kind of analog input device based on expansible serial bus system according to claim 1, feature exist In: bus module is to select control line CS, address choice by clock line CLK, downlink data line MOSI, upstream data line MISO, piece Line CSA composition.

4. a kind of analog input device based on expansible serial bus system according to claim 1, feature exist In: node selects logic module that electric signal is transferred to ADC module and analog switch module by spi bus.

5. a kind of analog input device based on expansible serial bus system according to claim 1, feature exist In: the analog input device internal data calculates in such a way that filtering calculates.