CN101349702A - Computer moisture measurement system - Google Patents

Abstract

The invention discloses a system for detecting the humidity of a computer, which comprises a humidity sensor, a magnifier, an A/D convertor, a system management bus SMBus interface, a computer mainframe and software. The system for detecting the humidity of a computer utilizes an accomplished input/output controller in the computer mainframe to be the main apparatus of the system management bus, utilizes the node of a spreading apparatus to be a slave device of the system management bus, utilizes a slave sending mode to transmit humidity signals which are measured to the main apparatus, namely communication is in two ways, utilizes a graph and number to display humidity signals, and monitors the environment parameter of a computer in real time. The system for detecting the humidity of a computer has excellent versatility, which can be easily achieved on a notebook computer and a desktop computer.

Description

Computer moisture measurement system

Technical field

The present invention relates to the computer measuring technique, particularly the humidity measurement system that System Management Bus (SMBus) is formed as interface in the computer.

Background technology

Usually the working environment of computer has requirement for humidity, so the measurement of humidity is very basic problem.In existing moisture measurement technology, there are some to pass through PCI, RS232, RS485 interface, calculate the device of monitoring by CPU.

I2C (I by the Philips exploitation ²C) bus has the standard of standard and the peripheral components of numerous band I2C interfaces, and the characteristics of I2C are the independence of structure and the simplicity that the user uses, and the compatible SMBus of a lot of I2C bus devices can directly use on SMBus.

With the I2C bus is that the System Management Bus of female parent is the serial communication bus that Intel proposes, comprise a data lines SMBDAT and a clock line SMBCLK, each bus device all has an address, the characteristics that plug and play is arranged, the peripheral components of all band SMBus interfaces all has answering, in computer, be widely used: as south bridge family chip ICH5, the ICH6 (I/O Controller HUB 6) of Intel, or with the South Bridge chip VIA8233 of the product compatibility of Intel, AMD768 etc. all can communicate with mode and the miscellaneous equipment of SMBus.

Power management bus PMBUS also is to be maternal universal serial bus with I2C, with the SMBus compatibility.

Though prior art has had above-mentioned all development, the monitoring of pair environment temperature is often arranged now, the ambient humidity measuring system that the good cost of rare compatibility is suitable in the computer.

Summary of the invention

Technical matters to be solved by this invention is, provides the general measuring system of a kind of structure, utilizes existing hardware resource of computer and software platform, and expanding system management bus and peripheral hardware are measured moisture signal in real time, by SMBus and main-machine communication.

For solving the problems of the technologies described above, the present invention has adopted following technical scheme:

A kind of computer moisture measurement system, its main body comprises humidity sensor, amplifier, A/D converter, serial line interface, host computer and software, the block diagram of system such as Fig. 1,

It is characterized in that:

I/o controller with host computer is the main equipment of System Management Bus, and the extended device node is the slave unit of System Management Bus, with the moisture signal of measuring to master transmissions from send mode, and two-way communication, service routine monitoring moisture signal,

System flow comprises: humidity data collection, data transmission, data computation and judgement, output show.

Described computer moisture measurement system, its feature also is:

The i/o controller of host computer is the integrated circuit die I CHn or the compatible integrated circuit (IC) chip of INTEL Corp., and ICHn also can integrate with other functional chip of main frame, and is for example integrated with north bridge chips, perhaps integrated with CPU.

Described computer moisture measurement system, its feature also is:

The slave unit of extended device node is an integrated circuit (IC) chip, the function of A/D converter, register and System Management Bus interface circuit that it is integrated at least, and further, also integrated humidity sensor and amplifier are promptly formed monolithic system.

Described computer moisture measurement system, its feature also is:

Program is a graphical user interface application program, comprises data acquisition, transmission, calculating and determining step, and program has temperature compensation and linear compensation function, moves under the WINDOWS of Microsoft operating system.

System can carry out temperature compensation and linear compensation function in A/D converter, as the temperature sensor and the correction memory of dotted arrow connection among Fig. 1.

Described computer moisture measurement system, its feature also is:

System Management Bus and device thereof are compatible power management bus PMBUS and device and I2C bus and devices thereof.

Described computer moisture measurement system, its feature also is:

Humidity sensor is installed in the main frame, measures the working environment humidity of main frame, also can measure the ambient humidity outside the main frame certainly.

Computer of the present invention is notebook computer, desktop computer, inserted computer, industrial computer or computer server, perhaps smart machine such as ATM.

The present invention compared with prior art has the following advantages and good effect:

1. because be the humidity measurement system of expanding on the computer system management bus, its versatility is good.

2. system architecture simple, be easy to realize that usage quantity is huge.

Description of drawings

Fig. 1 is the block diagram of system of the present invention

Fig. 2 is SMBUS data transport stream journey figure of the present invention

Fig. 3 is the circuit theory diagrams of embodiment 2

Embodiment

The invention will be further described below in conjunction with drawings and the specific embodiments.

Embodiment 1

The block diagram of system such as Fig. 1, South Bridge chip with Intel Company on the host computer is the example explanation, South Bridge chip inside provides SMBus main equipment, as ICH6 (82801F), ICH6 inside provides a SMBus main equipment, for processor and the communication of SMBus slave unit provide condition, have only main equipment (controller) to realize management and to detect to SMBus, as initial, stop, tranmitting data register etc., as not with the SMBus interface device of CPU, in bus, can only do to use from device, all are read, write operation all can reduce the master mode of SMBus, write operation is main send mode, and read operation is main accepting method.

The main body of computer moisture measurement system is made up of humidity sensor, amplifier, A/D converter and System Management Bus interface and main frame.The signal of humidity sensor measurement is through amplifier, input a/d converter is converted to digital signal, export the serial data of representing relative humidity RH by System Management Bus, under the control of main equipment, work, run on the operating platform of WINDOWS and CPU formation.In order to improve the figure place that precision can improve A/D converter, select 12 or the converter of multidigit more, the moisture measurement scope is (0～100%).For non-linear humidity sensor, the temperature sensor that is connected with dotted arrow among Fig. 1 is used for temperature compensation, proofread and correct memory and be used for linear compensation, one multiway analog switch (omitting among the figure) is arranged before amplifier this moment, the optional part that they are formed as system, humidity is proofreaied and correct memory can use EPROM or OTP memory, cooperates A/D converter work.

Here SMBUS two-wire serial interface comprises clock line SMBCLK and data line SMBDAT, SMBCLK is used to accept the serial clock signal that main equipment sends, and SMBDAT both can input instruction, the also humidity data of exportable measurement, be ternary exit, the time spent is not high-impedance state.In order to make data-signal is high level, at data line and V _CCNeed meet a pull-up resistor RP between the end, this pull-up resistor has been connected in the I/O interface circuit of main frame usually, and the maximum operation frequency of SMBUS is 100KHZ (highest frequency of noting I2C is greater than 400KHZ).Here peripheral hardware SMBUS interface measuring element is as slave, through the output of SMBUS interface, with host communication.

By SMBUS interface circuit transceive data, with the running status of this device of program monitoring, Fig. 2 is SMBus data transport stream journey figure, during main acceptance, first byte (from the address) is sent by master controller, and slave unit returns a response bits then, and next slave unit sends data to main equipment; During main the transmission, first byte that main equipment sends is the slave unit address, and next main equipment sends data to slave unit.

Embodiment 2.

The circuit theory of present embodiment on computer motherboard, is drawn SMBDAT and the SMBCLK interface to the SMBus of monitoring chip LM85, i.e. the SMBDAT of circuit LM85 and SMBCLK as shown in Figure 3.LM85 is used for humidity and temperature survey, LM85 device default address is 0101110, also can be changed to 0101100 or 0101101 by PWM3/AddEnable and TACH4/Addsel selection, so on the SMBus several LM85 can be arranged simultaneously, but its monitoring parameter comprises: voltage, temperature etc., built-in 8 A/D converters, pass through application program, the user can monitor tested humidity at any time, and the information that gives a warning when humidity is out-of-limit, and the user can be provided with the high and low limit value of humidity voluntarily.

The major function of LM85 is as follows:

The SMBus2.0 specification, SMBDAT, SMBCLK

Temperature survey passage tool digital filtering

Automatically control based on thermometric fan able to programme

Temperature survey in 1 group of sheet, 2 groups of external temperatures are measured: RE1+, RE1-, RE2+, RE2-

Vccp IN, 5V, 12V, 2.5V, 5 groups of voltage measurements of 3.3V (built-in match circuit)

Built-in 8 A/D converters, minimum 1 degree of differentiating of temperature

3 groups of PWM rotation speed of the fan control outputs: PWM1, PWM2, PWM3

4 groups of rotation speed of the fan countings input: TACH1, TACH2, TACH3, TACH4

Temperature-measuring range: 0-125 degree

5 VID monitoring side: VID0, VID1, VID2, VID3, VID4

The design of 24 pin, the QSOP encapsulation

XOR tree (XOR-tree) test model

See among Fig. 3 that LM85 can monitoring voltage, as+12V and+5V, can resistor voltage divider circuit be arranged at the input end of voltage measurement, make it to measure other non-nominal threshold voltage range.T1 is used for temperature survey among Fig. 3, temperature value is used for compensation, C1, C2, C3 are filter capacitors, in the used SMBus monitoring chip register is arranged, can be according to request for utilization, the programming tool that provides by the monitoring chip manufacturer writes given coefficient and state, does not Use Defaults automatically if the user is provided with, as temperature limit, A/D switching rate and the selection of I/O port etc. (seeing the explanation of SMBus monitoring chip and programming tool for details), also can onlinely change with program.

This routine humidity sensor uses the HS1100 humicap, its Main Feature: measurement range is wide, interchangeability is good, and response is fast, convenient formation linear voltage output circuit, can export the volt magnitude voltage signals that is proportionate relationship with relative humidity, the block diagram of metering circuit such as Fig. 3 part are characterized in HS1100 is inserted oscillator, make oscillation frequency along with humicap changes, pass through rectifying and wave-filtering and amplification again, the promptly exportable and linear voltage signal U of relative humidity _O, as supply voltage V _CC=5V, when temperature=25 were spent, the data of output voltage and relative humidity saw the following form 1, U _O(volt) can directly deliver to the input end of A/D, connects the 5V input end of LM85.R in the following table 1 _HBe relative humidity (%).

Table 1

R H	0	10	20	30	40	50	60	70	80	90	100
												U O	--	1.41	1.65	1.89	2.14	2.36	2.60	2.83	3.07	3.31	3.55

Described example transmits data and instruction by System Management Bus SMBus, communicates by letter with host computer, is realized the function of the measurement and the demonstration of humidity on computers by application program.

Claims (6)

1. computer moisture measurement system, it comprises humidity sensor, amplifier, A/D converter, serial line interface, host computer and software, it is characterized in that:

I/o controller with host computer is the main equipment of System Management Bus, and the extended device node is the slave unit of System Management Bus, with the moisture signal of measuring to master transmissions from send mode, and two-way communication, service routine monitoring moisture signal,

System flow comprises: humidity data collection, data transmission, data computation and judgement, output show.

2. computer moisture measurement system as claimed in claim 1 is characterized in that:

The i/o controller of host computer is the integrated circuit die I CHn or the compatible integrated circuit (IC) chip of INTEL Corp., and ICHn also can integrate with other functional chip of main frame.

3. computer moisture measurement system as claimed in claim 1 is characterized in that:

The slave unit of extended device node is an integrated circuit (IC) chip, the function of A/D converter, register and System Management Bus interface circuit that it is integrated at least, further, also integrated humidity sensor and amplifier.

4. computer moisture measurement system as claimed in claim 1 is characterized in that:

Program is a graphical user interface application program, comprises data acquisition, transmission, calculating and determining step, and program has temperature compensation and linear compensation function, moves under the WINDOWS of Microsoft operating system.

5. computer moisture measurement system as claimed in claim 1 is characterized in that:

System Management Bus and device thereof are compatible power management bus PMBUS and device and I2C bus and devices thereof.

6. computer moisture measurement system as claimed in claim 1 is characterized in that:

Humidity sensor is installed in the main frame, measures the working environment humidity of main frame.

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