CN201119072Y

CN201119072Y - A horse race lamp circuit and digital device

Info

Publication number: CN201119072Y
Application number: CNU2007201704411U
Authority: CN
Inventors: 裴锡涛
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2007-10-31
Filing date: 2007-10-31
Publication date: 2008-09-17
Anticipated expiration: 2017-10-31

Abstract

The utility model relates to a horse race lamp circuit and a digital equipment, which is suitable for the electronic field. The circuit comprises a horse race lamp unit and a serial-parallel port converter, wherein, the horse race lamp unit comprises a plurality of light emitting diodes, the serial-parallel port converter is connected with the horse race lamp unit and parallelly outputs the serial display control signals outputted by a central control unit to the horse race lamp unit and controls the on-off of the light emitting diodes. In the utility model, the display control signals serially outputted by the central control unit are parallelly transmitted to all the LEDs of the horse race lamp unit through the serial-parallel port converter to control the on-off of the horse race lamp unit, thus the on-off effect of the lamp can be realized by taking up only a little space of the central control unit control port.

Description

A kind of horse race lamp circuit and digital equipment

Technical field

The utility model belongs to electronic applications, relates in particular to a kind of horse race lamp circuit and digital equipment.

Background technology

Digital equipments such as current mobile phone, MP3 usually need to be equipped with the outward appearance of fashion, and the horse race lamp circuit is set can increase dazzling visual effect for it.At present, the horse race lamp circuit of digital equipment all adopts the central controller (CPU) of digital equipment as control unit, and the general purpose input and output of central controller (generalpurpose input/output, GPIO) the control mouth is limited, is difficult to realize multiple different horse race lamp light on and off effect.

Summary of the invention

The purpose of this utility model is to provide a kind of horse race lamp circuit, is intended to solve the problem that existing horse race lamp circuit is difficult to realize multiple different horse race lamp light on and off effect.

The utility model is achieved in that a kind of horse race lamp circuit, and described circuit comprises:

The horse race lamp unit comprises a plurality of light-emitting diodes; And

Be connected with described horse race lamp unit, export described horse race lamp unit to the serial display control signal of central controller output is parallel, control the serial ports-parallel port transducer of described a plurality of light-emitting diode light on and off.

Another purpose of the present utility model is to provide a kind of digital equipment that contains above-mentioned horse race lamp circuit.

In the utility model, the display control signal parallel convey of CPU serial output is given each light-emitting diode of horse race lamp unit by serial ports-parallel port transducer, control its light on and off, so only take limited CPU control mouth and just can realize multiple different horse race lamp light on and off effect.

Description of drawings

Fig. 1 is the theory diagram of the horse race lamp circuit that provides of the utility model;

Fig. 2 is the circuit structure diagram of the horse race lamp circuit that provides of the utility model;

Fig. 3 is the SCL clock signal that provides of the utility model and the sequential chart of SDA serial data signal.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

In the utility model, give each light-emitting diode of horse race lamp unit by serial ports-parallel port transducer to the display control signal parallel convey of CPU serial output, control its light on and off, can realize multiple different horse race lamp light on and off effect.

Fig. 1 shows the realization principle of the horse race lamp circuit that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.

Serial ports-parallel port transducer 11 is given horse race lamp unit 12 with the display control signal parallel convey of CPU serial output, corresponding light-emitting diode (Lighting Emitting Diode, light on and off LED) in the control horse race lamp unit 12.Serial ports-parallel port transducer 11 and horse race lamp unit 12 are powered by power supply.

Serial ports-parallel port transducer 11 can adopt internal integrated circuit (Inter-Integrated Circuit, I ²C)-the parallel port conversion chip, its serial ports input clock line (Serial Clock Line, SCL) end is input end of clock, serial ports input data line (Serial Date Line, SDA) end is data input pin, and these two ends are connected with GPIO2 with the control mouth GPIO1 of CPU respectively, constitutes I ²The C bus.

Have a plurality of LED in the horse race lamp unit 12, as an embodiment of the present utility model, horse race lamp unit 12 comprises at least 8 LED, under the control of serial ports-display control signal that parallel port transducer 11 is exported, can provide at least 256 kinds of luminous combinations.

Fig. 2 shows the structure that contains the horse race lamp circuit that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model, adopts I with serial ports-parallel port transducer 11 ²C-parallel port conversion chip U1, comprising 8 LED in the horse race lamp unit 12 is example.

I ²The SCL end of C-parallel port conversion chip U1 and SDA end meet GPIO1 and the GPIO2 of CPU respectively, receive the clock signal and the serial data signal of CPU output.The connection of A2-0 three ends has defined the address of this chip, in the utility model A2-0 is held whole ground connection, so the effective address of this chip is 000, its VCC end connects power supply by resistance R 8, and GND holds ground connection.

Fig. 3 shows the SCL clock signal that the utility model provides and the sequential of SDA serial data signal, and the SCL clock signal is a kind of square-wave signal, and the SDA serial data signal is transfused to I when the SCL rising edge of clock signal ²C-parallel port conversion chip U1.At first, import 1 initial signal, then, the I of 1 byte of input ²The address of C-parallel port conversion chip U1, expression chooses this chip to control, and wherein high four figures value is represented 3 bit address lines and R/W read-write selection for low four successively because this chip is defined as 0100.Owing on the hardware A2-0 is held whole ground connection, so address A2-0 is 000, it is that 0 expression CPU is to I that data are selected in lowest order R/W read-write ²C-parallel port conversion chip U1 write signal from its parallel port output P0-7 output, next is an ack signal again, just can import the serial data signal that is used to show control afterwards, all needs an ack signal to separate between the data of each byte.

I ²C-parallel port conversion chip U1 will hold being used to of importing to show that the serial data signal of control is through after changing from SDA, by parallel port output P0-7 and line output, parallel port output P0-7 connects the negative electrode of the LED0-7 of horse race lamp unit 12 respectively, the anode of the LED0-7 current-limiting resistance R0-7 that connects respectively, and then link to each other with power supply, prevent that electric current from burning out LED0-7 or I too greatly ²C-parallel port conversion chip U1.Like this, output on 8 LED0-7 from each 8 bit data of SDA end serial input are all parallel accordingly.When dateout was 0, corresponding LED0-7 both end voltage can reach luminous voltage, and lamp will be bright, and when dateout was 1, corresponding LED0-7 both end voltage can not reach luminous voltage, and lamp just can not be bright.By CPU to I ²C-parallel port conversion chip U1 sends the signal that different being used to shows control, just can realize multiple different horse race lamp light on and off effect.

As a preferred embodiment of the present utility model, horse race lamp unit 12 also is provided with static discharge, and (it is made of the resistance R 9 and the piezo-resistance VCR1 of serial connection for Electro Static Discharge, ESD) protection circuit.One end of resistance R 9 links to each other with the anode of LED0-7 by current-limiting resistance R0-7.The other end ground connection of piezo-resistance VCR1, when static discharge appearred in circuit, piezo-resistance VCR1 is the energy conducting when its both end voltage reaches critical value, discharges timely and effectively, prevents that circuit is subjected to the damage that static discharge brings.

In the utility model, give each LED of horse race lamp unit with the display control signal parallel convey of CPU serial output, control its light on and off, so only take limited CPU control and mouthful just can realize multiple different horse race lamp light on and off effect by serial ports-parallel port transducer.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1, a kind of horse race lamp circuit is characterized in that, described circuit comprises:

The horse race lamp unit comprises a plurality of light-emitting diodes; And

2, horse race lamp circuit as claimed in claim 1, it is characterized in that described horse race lamp unit comprises at least 8 light-emitting diodes, at least 256 kinds of luminous combinations are provided, the negative electrode of each light-emitting diode connects the parallel port output of serial ports-parallel port transducer, and anode connects power supply.

3, horse race lamp circuit as claimed in claim 2 is characterized in that, described horse race lamp unit also comprises:

Be serially connected in the current-limiting resistance between each light-emitting diode and the power supply.

4, as claim 2 or 3 described horse race lamp circuit, it is characterized in that described horse race lamp unit also comprises:

Be serially connected with the ESD protection circuit between light-emitting diode and the ground, the static that circuit is produced imports in the ground.

5, horse race lamp circuit as claimed in claim 1 is characterized in that, described serial ports-parallel port transducer is I ²C-parallel port conversion chip, its serial ports input SCL end is connected with central controller with the SDA end, and its parallel port output is connected with described horse race lamp unit.

6, a kind of digital equipment that comprises the horse race lamp circuit of claim 1.