MQ-3酒精传感器模块资料技术手册+软件测试工程源码.zip

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MQ-3酒精传感器模块资料技术手

MQ-3

酒精传感器模块资料技术手册

软件测试工程源码

MQ-3酒精传感器

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MQ-3酒精传感器模块是一种广泛应用于气体检测领域的电子设备，主要设计用于检测环境中酒精的浓度。这个压缩包包含了关于MQ-3传感器模块的详细技术资料和软件测试工程源码，帮助用户更好地理解和应用该模块。《MQ-3.pdf》是MQ-3酒精传感器的技术手册，其中涵盖了传感器的工作原理、规格参数、电路设计、接口定义以及如何进行信号处理等关键内容。MQ-3传感器采用半导体气敏材料，当其暴露在含有酒精的气体中时，材料的电阻值会发生变化，通过测量电阻的变化可以间接获取酒精浓度信息。《产品使用手册.doc》则为用户提供了一步一步的使用指导，包括传感器的安装、接线方式、电源需求、校准方法以及日常维护注意事项。这有助于确保用户正确地操作和保养MQ-3模块，从而获得准确可靠的检测结果。《检测说明判断传感器是否正常.txt》提供了检查传感器工作状态的方法，包括初始校零、正常工作状态下的电压读数范围以及异常情况的识别。通过这些步骤，用户可以快速验证传感器是否正常工作，并排除潜在故障。 “TTL输出测试程序”和“模拟量测试参考程序”是配套的软件资源，用于读取和解析MQ-3传感器的输出信号。TTL输出测试程序可能是一个简单的Arduino或Raspberry Pi代码示例，展示了如何连接传感器并处理其数字输出。模拟量测试程序则可能涉及ADC（模拟-to-数字转换器）的使用，因为MQ-3传感器通常提供模拟信号，需要转换为数字值才能被微控制器处理。在实际应用中，MQ-3酒精传感器常用于防酒驾装置、智能家居安全系统、工业过程监控等领域。通过软件测试工程源码，开发者可以了解如何将传感器数据整合到自己的项目中，实现报警、数据记录或其他定制功能。总结来说，这个压缩包提供的信息涵盖了MQ-3酒精传感器的硬件、软件和应用层面，无论是初学者还是有经验的开发者，都能从中获益，掌握如何有效地利用MQ-3模块进行气体检测和相关项目开发。

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MQ-3酒精传感器模块资料技术手册+软件测试工程源码.zip （40个子文件）

MQ-3酒精传感器模块资料技术手册+软件测试工程源码

检测说明判断传感器是否正常.txt 202B

TTL输出测试程序

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chengxu.M51 5KB

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chengxu.hex 164B

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chengxu.Opt 1KB

chengxu.plg 1KB

MQ-3.pdf 141KB

产品使用手册.doc 1.63MB

模拟量测试参考程序

ourhc.PWI 768B

keil

chengxu_Uv2.Bak 0B

STARTUP.OBJ 750B

chengxu.M51 8KB

chengxu.__i 37B

STARTUP.A51 6KB

chengxu 5KB

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ourhc.DSN 182KB

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ADC0809中文资料.txt 2KB

ADC0809.pdf 317KB

~$产品使用手册.doc 162B

ADC0808/ADC0809

8-Bit µP Compatible A/D Converters with 8-Channel

Multiplexer

General Description

The ADC0808, ADC0809 data acquisition component is a

monolithic CMOS device with an 8-bit analog-to-digital con-

verter, 8-channel multiplexer and microprocessor compatible

control logic. The 8-bit A/D converter uses successive ap-

proximation as the conversion technique. The converter fea-

tures a high impedance chopper stabilized comparator, a

256R voltage divider with analog switch tree and a succes-

sive approximation register. The 8-channel multiplexer can

directly access any of 8-single-ended analog signals.

The device eliminates the need for external zero and

full-scale adjustments. Easy interfacing to microprocessors

is provided by the latched and decoded multiplexer address

inputs and latched TTL TRI-STATE outputs.

The design of the ADC0808, ADC0809 has been optimized

by incorporating the most desirable aspects of several A/D

conversion techniques. The ADC0808, ADC0809 offers high

speed, high accuracy, minimal temperature dependence,

excellent long-term accuracy and repeatability, and con-

sumes minimal power. These features make this device

ideally suited to applications from process and machine

control to consumer and automotive applications. For

16-channel multiplexer with common output (sample/hold

port) see ADC0816 data sheet. (See AN-247 for more infor-

mation.)

Features

n Easy interface to all microprocessors

n Operates ratiometrically or with 5 V

or analog span

adjusted voltage reference

n No zero or full-scale adjust required

n 8-channel multiplexer with address logic

n 0V to 5V input range with single 5V power supply

n Outputs meet TTL voltage level specifications

n ADC0808 equivalent to MM74C949

n ADC0809 equivalent to MM74C949-1

Key Specifications

n Resolution 8 Bits

n Total Unadjusted Error

⁄

LSB and

1 LSB

n Single Supply 5 V

n Low Power 15 mW

n Conversion Time 100 µs

Block Diagram

00567201

See Ordering

Information

October 2002

ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer

Connection Diagrams

Dual-In-Line Package

00567211

Order Number ADC0808CCN or ADC0809CCN

See NS Package J28A or N28A

Molded Chip Carrier Package

00567212

Order Number ADC0808CCV or ADC0809CCV

See NS Package V28A

Ordering Information

TEMPERATURE RANGE −40˚C to +85˚C

Error

⁄

LSB Unadjusted ADC0808CCN ADC0808CCV

1 LSB Unadjusted ADC0809CCN ADC0809CCV

Package Outline N28A Molded DIP V28A Molded Chip Carrier

ADC0808/ADC0809

www.national.com 2

Absolute Maximum Ratings (Notes 2,

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (V

) (Note 3) 6.5V

Voltage at Any Pin −0.3V to

+0.3V)

Except Control Inputs

Voltage at Control Inputs −0.3V to +15V

(START, OE, CLOCK, ALE, ADD A, ADD B, ADD C)

Storage Temperature Range −65˚C to +150˚C

Package Dissipation at T

=25˚C 875 mW

Lead Temp. (Soldering, 10 seconds)

Dual-In-Line Package (plastic)

260˚C

Molded Chip Carrier Package

Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

ESD Susceptibility (Note 8) 400V

Operating Conditions (Notes 1, 2)

Temperature Range (Note 1) T

MIN

≤T

MAX

ADC0808CCN,ADC0809CCN −40˚C≤T

≤+85˚C

ADC0808CCV, ADC0809CCV −40˚C≤T

≤+85˚C

Range of V

(Note 1) 4.5 V

to 6.0 V

Electrical Characteristics

Converter Specifications: V

=5 V

REF+

REF(−)

=GND, T

MIN

≤T

MAX

and f

CLK

=640 kHz unless otherwise stated.

Symbol Parameter Conditions Min Typ Max Units

ADC0808

Total Unadjusted Error 25˚C

⁄

LSB

(Note 5) T

MIN

to T

MAX

⁄

LSB

ADC0809

Total Unadjusted Error 0˚C to 70˚C

1 LSB

(Note 5) T

MIN

to T

MAX

⁄

LSB

Input Resistance From Ref(+) to Ref(−) 1.0 2.5 kΩ

Analog Input Voltage Range (Note 4) V(+) or V(−) GND−0.10 V

+0.10 V

REF(+)

Voltage, Top of Ladder Measured at Ref(+) V

+0.1 V

Voltage, Center of Ladder V

/2-0.1 V

/2 V

/2+0.1 V

REF(−)

Voltage, Bottom of Ladder Measured at Ref(−) −0.1 0 V

Comparator Input Current f

=640 kHz, (Note 6) −2

0.5 2 µA

Electrical Characteristics

Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤V

≤5.25V,

−40˚C≤T

≤+85˚C unless otherwise noted

Symbol Parameter Conditions Min Typ Max Units

ANALOG MULTIPLEXER

OFF(+)

OFF Channel Leakage Current V

=5V, V

=5V,

=25˚C 10 200 nA

MIN

to T

MAX

1.0 µA

OFF(−)

OFF Channel Leakage Current V

=5V, V

=0,

=25˚C −200 −10 nA

MIN

to T

MAX

−1.0 µA

CONTROL INPUTS

IN(1)

Logical “1” Input Voltage V

−1.5 V

IN(0)

Logical “0” Input Voltage 1.5 V

IN(1)

Logical “1” Input Current V

=15V 1.0 µA

(The Control Inputs)

IN(0)

Logical “0” Input Current V

=0 −1.0 µA

(The Control Inputs)

Supply Current f

CLK

=640 kHz 0.3 3.0 mA

ADC0808/ADC0809

www.national.com3

Electrical Characteristics (Continued)

Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤V

≤5.25V,

−40˚C≤T

≤+85˚C unless otherwise noted

Symbol Parameter Conditions Min Typ Max Units

DATA OUTPUTS AND EOC (INTERRUPT)

OUT(1)

Logical “1” Output Voltage V

= 4.75V

OUT

= −360µA

OUT

= −10µA

2.4

4.5

V(min)

OUT(0)

Logical “0” Output Voltage I

=1.6 mA 0.45 V

OUT(0)

Logical “0” Output Voltage EOC I

=1.2 mA 0.45 V

OUT

TRI-STATE Output Current V

=5V 3 µA

=0 −3 µA

Electrical Characteristics

Timing Specifications V

REF(+)

=5V, V

REF(−)

=GND, t

=20 ns and T

=25˚C unless otherwise noted.

Symbol Parameter Conditions MIn Typ Max Units

Minimum Start Pulse Width (Figure 5) 100 200 ns

WALE

Minimum ALE Pulse Width (Figure 5) 100 200 ns

Minimum Address Set-Up Time (Figure 5)2550ns

Minimum Address Hold Time (Figure 5)2550ns

Analog MUX Delay Time R

=0Ω (Figure 5) 1 2.5 µs

From ALE

OE Control to Q Logic State C

=50 pF, R

=10k (Figure 8) 125 250 ns

OE Control to Hi-Z C

=10 pF, R

=10k (Figure 8) 125 250 ns

Conversion Time f

=640 kHz, (Figure 5) (Note 7) 90 100 116 µs

Clock Frequency 10 640 1280 kHz

EOC

EOC Delay Time (Figure 5) 0 8+2 µS Clock

Periods

Input Capacitance At Control Inputs 10 15 pF

OUT

TRI-STATE Output At TRI-STATE Outputs 10 15 pF

Capacitance

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its specified operating conditions.

Note 2: All voltages are measured with respect to GND, unless othewise specified.

Note 3: A zener diode exists, internally, from V

to GND and has a typical breakdown voltage of 7 V

Note 4: Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop

greater than the V

n supply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog V

does not exceed the supply voltage

by more than 100 mV, the output code will be correct. To achieve an absolute 0V

to 5V

input voltage range will therefore require a minimum supply voltage of

4.900 V

over temperature variations, initial tolerance and loading.

Note 5: Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors. See Figure 3. None of these A/Ds requires a zero or full-scale adjust.

However, if an all zero code is desired for an analog input other than 0.0V, or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale) the reference

voltages can be adjusted to achieve this. See Figure 13.

Note 6: Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock frequency and has

little temperature dependence (Figure 6). See paragraph 4.0.

Note 7: The outputs of the data register are updated one clock cycle before the rising edge of EOC.

Note 8: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

ADC0808/ADC0809

www.national.com 4

Functional Description

Multiplexer. The device contains an 8-channel single-ended

analog signal multiplexer. A particular input channel is se-

lected by using the address decoder. Table 1 shows the input

states for the address lines to select any channel. The

address is latched into the decoder on the low-to-high tran-

sition of the address latch enable signal.

TABLE 1.

SELECTED ADDRESS LINE

ANALOG CHANNEL C B A

IN0 L L L

IN1 L L H

IN2 L H L

IN3 L H H

IN4 H L L

IN5 H L H

IN6 H H L

IN7 H H H

CONVERTER CHARACTERISTICS

The Converter

The heart of this single chip data acquisition system is its

8-bit analog-to-digital converter. The converter is designed to

give fast, accurate, and repeatable conversions over a wide

range of temperatures. The converter is partitioned into 3

major sections: the 256R ladder network, the successive

approximation register, and the comparator. The converter’s

digital outputs are positive true.

The 256R ladder network approach (Figure 1) was chosen

over the conventional R/2R ladder because of its inherent

monotonicity, which guarantees no missing digital codes.

Monotonicity is particularly important in closed loop feedback

control systems. A non-monotonic relationship can cause

oscillations that will be catastrophic for the system. Addition-

ally, the 256R network does not cause load variations on the

reference voltage.

The bottom resistor and the top resistor of the ladder net-

work in Figure 1 are not the same value as the remainder of

the network. The difference in these resistors causes the

output characteristic to be symmetrical with the zero and

full-scale points of the transfer curve. The first output transi-

tion occurs when the analog signal has reached +

⁄

LSB

and succeeding output transitions occur every 1 LSB later up

to full-scale.

The successive approximation register (SAR) performs 8

iterations to approximate the input voltage. For any SAR

type converter, n-iterations are required for an n-bit con-

verter. Figure 2 shows a typical example of a 3-bit converter.

In the ADC0808, ADC0809, the approximation technique is

extended to 8 bits using the 256R network.

The A/D converter’s successive approximation register

(SAR) is reset on the positive edge of the start conversion

start pulse. The conversion is begun on the falling edge of

the start conversion pulse. A conversion in process will be

interrupted by receipt of a new start conversion pulse. Con-

tinuous conversion may be accomplished by tying the

end-of-conversion (EOC) output to the SC input. If used in

this mode, an external start conversion pulse should be

applied after power up. End-of-conversion will go low be-

tween 0 and 8 clock pulses after the rising edge of start

conversion.

The most important section of the A/D converter is the

comparator. It is this section which is responsible for the

ultimate accuracy of the entire converter. It is also the com-

parator drift which has the greatest influence on the repeat-

ability of the device. A chopper-stabilized comparator pro-

vides the most effective method of satisfying all the

converter requirements.

The chopper-stabilized comparator converts the DC input

signal into an AC signal. This signal is then fed through a

high gain AC amplifier and has the DC level restored. This

technique limits the drift component of the amplifier since the

drift is a DC component which is not passed by the AC

amplifier. This makes the entire A/D converter extremely

insensitive to temperature, long term drift and input offset

errors.

Figure 4 shows a typical error curve for the ADC0808 as

measured using the procedures outlined in AN-179.

ADC0808/ADC0809

www.national.com5

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