CN102361488B - Mobile phone - Google Patents
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- CN102361488B CN102361488B CN201110302027.2A CN201110302027A CN102361488B CN 102361488 B CN102361488 B CN 102361488B CN 201110302027 A CN201110302027 A CN 201110302027A CN 102361488 B CN102361488 B CN 102361488B
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Abstract
The invention provides a kind of mobile phone and the temperature checking method based on mobile phone, wherein this mobile phone comprises built-in thermistor and display screen, in the circuit board that built-in thermistor is built in mobile phone or battery, this mobile phone comprises further: Subscriber Interface Module SIM, inputs produce Temperature displaying selection signal according to user; Measuring circuit, obtains the voltage drop value of the analog signal format at built-in thermistor two ends; Analog to digital converter, is converted to the voltage drop value of digital signals format by the voltage drop value of the analog signal format at built-in thermistor two ends in response to Temperature displaying selection signal; Base band signal processing chip, obtains the temperature of built-in thermistor according to the voltage drop value of digital signals format, and to control display screen displays temperature be current environmental temperature.By the way, can for mobile phone provides thermometer function under the prerequisite not increasing cost.
Description
Technical field
The present invention relates to electronic information technical field, particularly relate to a kind of mobile phone and the temperature checking method based on mobile phone.
Background technology
At present, mobile phone terminal has become indispensable element in people's daily life, and along with the development of technology, mobile phone starts to be embedded with increasing additional function, as web page browsing, image taking, video record, movement velocity detection, temperature detection etc.
In the prior art, when needs during set temperature measuring ability, often need to set up extra temperature sensor in mobile phone, then need thus to purchase a collection of temperature sensor in addition in the process of producing mobile phone, thus cause the increase of production cost.
Generally speaking, the circuit board of mobile phone or battery are often provided with built-in thermistor, for the temperature of testing circuit plate or battery.
Therefore, if a kind of mobile phone and the temperature checking method based on mobile phone can be provided, by utilizing set built-in thermistor on the circuit board of mobile phone or battery to obtain current environmental temperature, then greatly production cost can be reduced.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of mobile phone and the temperature checking method based on mobile phone, to utilize mobile phone to have resource, under the prerequisite not increasing additional temperature detection hardware, detects current environmental temperature.
The present invention is the technical scheme that technical solution problem adopts: provide a kind of mobile phone, comprise built-in thermistor and display screen, in the circuit board that built-in thermistor is built in mobile phone or battery, this mobile phone comprises further: Subscriber Interface Module SIM, inputs produce Temperature displaying selection signal according to user; Measuring circuit, obtains the voltage drop value of the analog signal format at built-in thermistor two ends; Analog to digital converter, is converted to the voltage drop value of digital signals format by the voltage drop value of the analog signal format at built-in thermistor two ends in response to Temperature displaying selection signal; Base band signal processing chip, obtains the temperature of built-in thermistor according to the voltage drop value of digital signals format, and to control display screen displays temperature be current environmental temperature.
Wherein, base band signal processing chip is further used for judging whether the current power consumption of mobile phone is less than predetermined power consumption threshold value, and when determining current power consumption and being less than predetermined power consumption threshold value, controlling display screen displays temperature is current environmental temperature.
Wherein, base band signal processing chip is further used for when determining current power consumption and being more than or equal to predetermined power consumption threshold value, and controlling display screen displays temperature is current circuit board or battery temperature.
Wherein, when built-in thermistor is in the battery being built in mobile phone, mobile phone is provided with constant voltage source and divider resistance further, one end ground connection of built-in thermistor, the other end of thermistor is connected with one end of divider resistance, the other end of divider resistance is connected with constant voltage source, and analog to digital converter is connected with the other end of thermistor, and base band signal processing chip obtains temperature according to following equation:
Wherein, T is temperature, and B is heat sensitive index, T
0be the kelvin rating of 25 DEG C, R
0built-in thermistor the resistance value of 25 DEG C, V
rvoltage drop value, V
pit is the constant voltage values that constant voltage source exports.
Wherein, when built-in thermistor is in the circuit board being built in mobile phone, mobile phone is provided with constant voltage source, the first divider resistance and the second divider resistance further, one end ground connection of built-in thermistor, the other end of thermistor is connected with one end of the first divider resistance, second divider resistance and thermistor are arranged in parallel, the other end of the first divider resistance is connected with constant voltage source, analog to digital converter is connected with the other end of thermistor, and base band signal processing chip obtains temperature according to following equation:
Wherein, T is temperature, and B is heat sensitive index, T
0be the kelvin rating of 25 DEG C, R
0built-in thermistor the resistance value of 25 DEG C, V
1voltage drop value, V
pit is the constant voltage values that constant voltage source exports.
Wherein, analog to digital converter is integrated in base band signal processing chip.
Wherein, Subscriber Interface Module SIM is keyboard, touch-screen or acoustic control input module.
The present invention is another technical scheme that technical solution problem adopts: provide a kind of temperature checking method based on mobile phone, wherein, mobile phone comprises built-in thermistor and display screen, in the circuit board that built-in thermistor is built in mobile phone or battery, this temperature checking method comprises the following steps: input according to user and produce Temperature displaying and select signal; Obtain the voltage drop value of the analog signal format at built-in thermistor two ends; In response to Temperature displaying selection signal, the voltage drop value of the analog signal format at built-in thermistor two ends is converted to the voltage drop value of digital signals format; Obtain the temperature of built-in thermistor according to the voltage drop value of digital signals format, and to control display screen displays temperature be current environmental temperature.
Wherein, after the step of temperature obtaining built-in thermistor according to the voltage drop value of digital signals format, judge whether the current power consumption of mobile phone is less than predetermined power consumption threshold value further, and when determining current power consumption and being less than predetermined power consumption threshold value, controlling display screen displays temperature is current environmental temperature.
Wherein, when determining current power consumption and being more than or equal to predetermined power consumption threshold value, controlling display screen displays temperature is current circuit board or battery temperature.
The invention has the beneficial effects as follows: the situation being different from prior art, disclosed mobile phone and utilize based on the temperature checking method of this mobile phone and be built in built-in thermistor in the circuit board of mobile phone or battery and carry out temperature detection, current environmental temperature is detected under the prerequisite not increasing additional temperature detection hardware, can for mobile phone provides thermometer function under the prerequisite not increasing cost.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of mobile phone according to a first embodiment of the present invention;
Fig. 2 is the flow chart of the thermometry based on the mobile phone in first embodiment of the invention;
Fig. 3 is the electrical block diagram of mobile phone according to a second embodiment of the present invention;
Fig. 4 is the electrical block diagram of mobile phone according to a third embodiment of the present invention.
Embodiment
First Fig. 1 is referred to, Fig. 1 is the electrical block diagram of mobile phone according to a first embodiment of the present invention, as shown in Figure 1, mobile phone of the present invention comprises built-in thermistor 101 and display screen 102, in the circuit board that built-in thermistor 101 is built in mobile phone or battery, this mobile phone comprises further: Subscriber Interface Module SIM 103, it can input according to user and produce Temperature displaying selection signal, measuring circuit 104, it can obtain the voltage drop value of the analog signal format at built-in thermistor 101 two ends, analog to digital converter 105, it can select signal that the voltage drop value of the analog signal format at built-in thermistor 101 two ends is converted to the voltage drop value of digital signals format in response to Temperature displaying, base band signal processing chip 106, the temperature of built-in thermistor 101 is obtained according to the voltage drop value of digital signals format, and to control display screen 102 displays temperature be current environmental temperature.
In the present embodiment, Subscriber Interface Module SIM 103 is keyboard, touch-screen or acoustic control input module, can choose according to actual needs.As when Subscriber Interface Module SIM 103 is chosen for keyboard, user presses on the different key of keyboard, produce Temperature displaying when pressing several specific keys at the same time as being set to and select signal, this Temperature displaying selection signal can be used for trigger mode number converter 105 and works.
In an alternative embodiment, on the basis of the present embodiment, following setting can be made further: base band signal processing chip 106 is further used for judging whether the current power consumption of mobile phone is less than predetermined power consumption threshold value, and when determining current power consumption and being less than predetermined power consumption threshold value, controlling display screen 102 displays temperature is current environmental temperature.And when determining current power consumption and being more than or equal to predetermined power consumption threshold value, controlling display screen 102 displays temperature is current circuit board or battery temperature.In this alternative embodiment, mainly consider that current circuit board or battery temperature and current environmental temperature operate and difference under non-big current mode of operation at mobile phone big current: (make a phone call by the place that the situation that wherein big current operates is included in poor signal not carrying out big current operation for mobile phone, mobile phone is utilized to watch video frequency program or other expend the task of system resource in a large number) when, circuit board or battery substantially can not be overheated, its current circuit board or battery temperature consistent with current environmental temperature temperature, can be current environmental temperature by measured Temperature displaying.And when mobile phone is when carrying out big current operation, what now measure is current circuit board or battery temperature, therefore arranging base band signal processing chip 106, to control display screen 102 displays temperature be current circuit board or battery temperature.Due to square being directly proportional of power consumption and electric current, therefore the current value of base band signal processing chip 106 detection of handset inside can be utilized, current power consumption is extrapolated according to current value, and a predetermined power consumption threshold value is set, current power consumption and predetermined power consumption threshold value are made comparisons, thus judges that surveyed temperature is current environmental temperature or current circuit board or battery temperature.Wherein this predetermined power consumption threshold value can obtain according to test of many times, and, be this area common technology in the power consumption calculation mode described in this, therefore do not do more deep description.
Refer to Fig. 2, Fig. 2 is the flow chart of the thermometry based on the mobile phone in first embodiment of the invention, as shown in Figure 2, comprises the steps: in the thermometry based on mobile phone of the present invention
Step 201, inputs according to user and produces Temperature displaying selection signal.
Step 202, obtains the voltage drop value of the analog signal format at built-in thermistor 101 two ends.
Step 203, is converted to the voltage drop value of digital signals format by the voltage drop value of the analog signal format at built-in thermistor 101 two ends in response to Temperature displaying selection signal.
Step 204, obtains the temperature of built-in thermistor 101 according to the voltage drop value of digital signals format.
Step 205, judges whether the current power consumption of mobile phone is less than predetermined power consumption threshold value, when judged result is "Yes", performs step 305, when judged result is "No", performs step 306.
Step 206, controlling display screen 102 displays temperature is current environmental temperature.
Step 207, controlling display screen 102 displays temperature is current circuit board or battery temperature.
Wherein, above step 201 can be performed by Subscriber Interface Module SIM 103, and step 202 can be performed by measuring circuit 104, and step 203 can be performed by analog to digital converter 105, and step 203-206 can be performed by base band signal processing chip 106.
In addition, step 205 is mainly used in judging current power consumption, can choose according to actual needs, this step can be omitted in alternative of the present invention, when omitting step 205, step 207 can be omitted in the lump, it should be noted that, when omitting step 205 and step 207, user need be at mobile phone and is just in holding state or do not select to start said method when carrying out big current operation, to obtain temperature and it is shown as current environmental temperature in display screen 102, know current environmental temperature to make user.And when mobile phone is when carrying out big current operation, then need to wait for that mobile phone restarts said method after reentering holding state, to ensure that the temperature of display in display screen 102 is for current environmental temperature.
In the present embodiment, by utilizing the built-in thermistor 101 be built in the circuit board of mobile phone or battery accurately can measure current environmental temperature when carrying out the operation of non-big current and show user by display screen 102 at mobile phone.
Below will be described in detail mobile phone second of the present invention and the 3rd embodiment respectively see Fig. 3 and Fig. 4, wherein second and the 3rd in embodiment, respectively for be built in mobile phone battery and be built in mobile phone circuit board built-in thermistor corresponding to measuring circuit be described in detail, and derive the equation run needed for base band signal processing chip according to different measuring circuits.
Refer to Fig. 3, Fig. 3 is the electrical block diagram of mobile phone according to a second embodiment of the present invention, as shown in Figure 3, in a second embodiment, mobile phone of the present invention comprises battery 301, built-in thermistor 302, display screen 303, Subscriber Interface Module SIM 304, analog to digital converter 305, base band signal processing chip 306, constant voltage source 307 and divider resistance 308.Built-in thermistor 302 is built in the battery 301 of mobile phone, specifically, is fixedly installed in battery 301 when producing battery 301.
As shown in Figure 2, in a second embodiment, constant voltage source 307 and divider resistance 308 form measuring circuit, for obtaining the voltage drop value of the analog signal format at built-in thermistor 302 two ends, one end ground connection of built-in thermistor 302, the other end of thermistor is connected with one end of divider resistance 308, and the other end of divider resistance 308 is connected with constant voltage source 307, and analog to digital converter 305 is connected with the other end of thermistor.It should be noted that in this, as a rule, battery 301 and mobile phone are pluggable settings, when battery 301 is inserted in mobile phone by user, the other end of the built-in thermistor 302 in battery 301 is by being connected with the signal input point 309 of analog to digital converter 305 is pluggable, certainly be fixedly installed at battery 301 in the situation in mobile phone (as i Phone), the other end of the built-in thermistor 302 in battery 301 keeps being fixedly connected with the signal input point 109 of analog to digital converter 305.
Subscriber Interface Module SIM 304 inputs according to user and produces Temperature displaying selection signal, measuring circuit obtains the voltage drop value of the analog signal format at built-in thermistor 302 two ends, the voltage drop value of the analog signal format at built-in thermistor 302 two ends is converted to the voltage drop value of digital signals format by analog to digital converter 305 in response to Temperature displaying selection signal, base band signal processing chip 306 obtains the temperature of built-in thermistor 302 according to the voltage drop value of digital signals format, and to control display screen 303 displays temperature be current environmental temperature.
Wherein, Subscriber Interface Module SIM 304 is keyboard, touch-screen or acoustic control input module, can choose according to actual needs.As when Subscriber Interface Module SIM 304 is chosen for keyboard, user presses on the different key of keyboard, produce Temperature displaying when pressing several specific keys at the same time as being set to and select signal, this Temperature displaying selection signal can be used for trigger mode number converter 305 and works.
In an alternative embodiment, on the basis of the present embodiment, following setting can be made: base band signal processing chip 306 is further used for judging whether the current power consumption of mobile phone is less than predetermined power consumption threshold value, and when determining current power consumption and being less than predetermined power consumption threshold value, controlling display screen 303 displays temperature is current environmental temperature.And when determining current power consumption and being more than or equal to predetermined power consumption threshold value, controlling display screen 303 displays temperature is present battery 301 temperature.In this alternative embodiment, mainly consider that present battery 301 temperature and current environmental temperature operate and difference under non-big current mode of operation at mobile phone big current: mobile phone is not when carrying out big current operation (situation that wherein big current operates is included in the place of poor signal and makes a phone call, utilizes mobile phone to watch video frequency program or other expend the task of system resource in a large number), battery 301 substantially can not be overheated, its present battery 301 temperature is consistent with current environmental temperature temperature, can be current environmental temperature by measured Temperature displaying.And when mobile phone is when carrying out big current operation, what now measure is present battery 301 temperature, therefore arranging base band signal processing chip 306, to control display screen 303 displays temperature be present battery 301 temperature.Due to square being directly proportional of power consumption and electric current, therefore the current value of base band signal processing chip 306 detection of handset inside can be utilized, current power consumption is extrapolated according to current value, and a predetermined power consumption threshold value is set, current power consumption and predetermined power consumption threshold value are made comparisons, thus judges that surveyed temperature is current environmental temperature or present battery 301 temperature.Wherein this predetermined power consumption threshold value can obtain according to test of many times, and, be this area common technology in the power consumption calculation mode described in this, therefore do not do more deep description.
In the present embodiment, base band signal processing chip 306 obtains temperature according to following equation:
Wherein, T is temperature, and B is heat sensitive index, T
0be the kelvin rating of 25 DEG C, R
0built-in thermistor 302 the resistance value of 25 DEG C, V
rvoltage drop value, V
pit is the constant voltage values that constant voltage source 307 exports.
The derivation of equation (1) is as follows:
First, the magnitude of voltage V at built-in thermistor 302 two ends
rcan be recorded by analog to digital converter 305, the resistance of definition thermistor is R
r, because constant voltage source 307, divider resistance 308 and built-in thermistor 302 form loop, so following equation can be obtained according to voltage divider principle:
Equation (2) can be obtained following equation after simple transformation:
According to prior art, the inside resistivity-temperature characteristics equation of built-in thermistor 302 is as follows:
Equation (4) can be obtained following equation after simple transformation:
Equation (3) is substituted into equation (5) equation (1) can be obtained:
It should be noted that in this temperature T that calculates be absolute temperature, therefore, if desired obtain Celsius temperature T (DEG C), then can obtain Celsius temperature T (DEG C) according to equation (6):
T(℃)＝T-273.15 (6)
Wherein, B is heat sensitive index, and it is defined as follows:
Wherein R
3that thermistor is at temperature T
3time resistance value, R
4that thermistor is at temperature T
4time resistance value, generally speaking temperature T
3be chosen for 25 DEG C, temperature T
4be chosen for 50 DEG C.
Wherein each built-in thermistor 302 all can provide its heat sensitive index, as with regard to model be NCP15XH103F03RC built-in thermistor 302 with regard to, its heat sensitive index B=3380.
It should be noted that, above-mentioned equation (1) is burnt in the program storage of base band signal processing chip 306 by the mode of program code, be kept in program storage with digital signals format, when base band signal processing chip 306 gets the voltage drop value of digital signals format, voltage drop value can be substituting to the V of equation (1)
rin, and due to B, T
0, R
1, V
p, R
0be known numeric value, therefore the CPU of base band signal processing chip 306 obtains temperature T by computing equation (1).
Below refer to Fig. 4, Fig. 4 is the electrical block diagram of mobile phone according to a third embodiment of the present invention, as shown in Figure 4, in mobile phone of the present invention 3rd embodiment, mobile phone of the present invention comprises circuit board 401, built-in thermistor 402, display screen 403, Subscriber Interface Module SIM 404, analog to digital converter 405, base band signal processing chip 406, constant voltage source 407, first divider resistance 408 and the second divider resistance 409.Built-in thermistor 402 is built in the circuit board 401 of mobile phone.
As shown in Figure 4, in the third embodiment, constant voltage source 407, first divider resistance 408 and the second divider resistance 409 form measuring circuit, for obtaining the voltage drop value of the analog signal format at built-in thermistor 402 two ends, one end ground connection of built-in thermistor 402, the other end of thermistor is connected with one end of the first divider resistance 408, second divider resistance 409 is arranged in parallel with thermistor, the other end of the first divider resistance 408 is connected with constant voltage source 407, analog to digital converter 405 is connected with the other end of thermistor, Subscriber Interface Module SIM 404 inputs according to user and produces Temperature displaying selection signal, the voltage drop value of the analog signal format at built-in thermistor 402 two ends is converted to the voltage drop value of digital signals format by analog to digital converter 405 in response to Temperature displaying selection signal, base band signal processing chip 406 obtains the temperature of built-in thermistor 402 according to the voltage drop value of digital signals format, and to control display screen 403 displays temperature be current environmental temperature.
As hereinbefore, in the present embodiment, Subscriber Interface Module SIM 404 is keyboard, touch-screen or acoustic control input module, can choose according to actual needs.As when Subscriber Interface Module SIM 404 is chosen for keyboard, user presses on the different key of keyboard, produce Temperature displaying when pressing several specific keys at the same time as being set to and select signal, this Temperature displaying selection signal can be used for trigger mode number converter 405 and works.
As hereinbefore, in an alternative embodiment, on the basis of the present embodiment, following setting can be made: base band signal processing chip 406 is further used for judging whether the current power consumption of mobile phone is less than predetermined power consumption threshold value, and when determining current power consumption and being less than predetermined power consumption threshold value, controlling display screen 403 displays temperature is current environmental temperature.And when determining current power consumption and being more than or equal to predetermined power consumption threshold value, controlling display screen 403 displays temperature is current circuit board 401 temperature.In this alternative embodiment, mainly consider that current circuit board 401 temperature and current environmental temperature operate and difference under non-big current mode of operation at mobile phone big current: mobile phone is not when carrying out big current operation (situation that wherein big current operates is included in the place of poor signal and makes a phone call, utilizes mobile phone to watch video frequency program or other expend the task of system resource in a large number), circuit board 401 substantially can not be overheated, its current circuit board 401 temperature is consistent with current environmental temperature temperature, can be current environmental temperature by measured Temperature displaying.And when mobile phone is when carrying out big current operation, what now measure is current circuit board 401 temperature, therefore arranging base band signal processing chip 406, to control display screen 403 displays temperature be current circuit board 401 temperature.Due to square being directly proportional of power consumption and electric current, therefore the current value of base band signal processing chip 406 detection of handset inside can be utilized, current power consumption is extrapolated according to current value, and a predetermined power consumption threshold value is set, current power consumption and predetermined power consumption threshold value are made comparisons, thus judges that surveyed temperature is current environmental temperature or current circuit board 401 temperature.Wherein this predetermined power consumption threshold value can obtain according to test of many times, and, be this area common technology in the power consumption calculation mode described in this, therefore do not do more deep description.
In the present embodiment, base band signal processing chip 406 obtains temperature according to following equation:
Wherein, T is temperature, and B is heat sensitive index, T
0be the kelvin rating of 25 DEG C, R
0built-in thermistor 402 the resistance value of 25 DEG C, V
1voltage drop value, V
pit is the constant voltage values that constant voltage source 407 exports.
The derivation of equation (8) is as follows:
Because the first divider resistance 408 and the second divider resistance 409 are arranged in parallel, therefore its equivalent resistance Rp is:
The magnitude of voltage Vr of thermistor end can be recorded by analog to digital converter 405, the resistance of definition thermistor is Rr, because constant voltage source 407, first divider resistance 408 and the second divider resistance 409 and built-in thermistor 402 form loop, so can obtain following equation according to voltage divider principle:
Equation (10) is substituted into equation (11) following equation can be obtained:
According to prior art, the inside resistivity-temperature characteristics equation of built-in thermistor 402 is as follows:
Equation (4) can be obtained following equation after simple transformation:
Equation (11) is substituted into equation (13) equation (8) can be obtained:
Identical with the first embodiment, in this temperature T that calculates be absolute temperature, therefore, if desired obtain Celsius temperature T (DEG C), then can obtain Celsius temperature T (DEG C) according to equation (6).
In like manner, the related definition of heat sensitive index B is described in detail in the first embodiment, does not repeat in this.
Identical with described in the second embodiment, above-mentioned equation (8) is burnt in the program storage of base band signal processing chip 406 by the mode of program code, be kept in program storage with digital signals format, at base band signal processing chip 406 to when getting the voltage drop value of digital signals format, can by concrete numerical value be substituting to the V of equation (1)
rin, and due to B, T
0, R
1, R
2, V
p, R
0be known numeric value, therefore the CPU of base band signal processing chip 406 obtains temperature T by computing equation (1).
Due to the development of user's request and chip technology, often as required using the original circuit as peripheral hardware or integrated chip in master chip, make the function of master chip more powerful, and shorten the construction cycle, therefore, in alternative of the present invention, can analog to digital converter be integrated in base band signal processing chip, base band signal processing chip directly can read the voltage drop value of the analog signal format at built-in thermistor two ends by related port, and obtain Temperature displaying selection signal from Subscriber Interface Module SIM, in response to Temperature displaying selection signal, the voltage drop value of the analog signal format at built-in thermistor two ends is converted to the voltage drop value of digital signals format.
In sum, disclosed mobile phone and utilize based on the temperature checking method of this mobile phone and be built in built-in thermistor in the circuit board of mobile phone or battery and carry out temperature detection, current environmental temperature is detected under the prerequisite not increasing additional temperature detection hardware, can for mobile phone provides thermometer function under the prerequisite not increasing cost.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (3)
1. a mobile phone, comprises built-in thermistor and display screen, and described built-in thermistor is built in the circuit board of described mobile phone, it is characterized in that, described mobile phone comprises further:
Subscriber Interface Module SIM, inputs according to user and produces Temperature displaying selection signal;
Measuring circuit, obtain the voltage drop value of the analog signal format at described built-in thermistor two ends, comprise constant voltage source, the first divider resistance and the second divider resistance, described second divider resistance is built in the circuit board of described mobile phone, one end ground connection of described built-in thermistor, the other end of described thermistor is connected with one end of the first divider resistance, described second divider resistance and described thermistor are arranged in parallel, the other end of described first divider resistance is connected with described constant voltage source, and analog to digital converter is connected with the other end of described thermistor;
Described analog to digital converter, is converted to the voltage drop value of digital signals format by the voltage drop value of the analog signal format at described built-in thermistor two ends in response to described Temperature displaying selection signal;
Base band signal processing chip, the temperature of described built-in thermistor is obtained according to the voltage drop value of described digital signals format, and judge whether the current power consumption of described mobile phone is less than predetermined power consumption threshold value, and when determining current power consumption and being less than described predetermined power consumption threshold value, controlling described display screen, to show described temperature be current environmental temperature, when determining current power consumption and being more than or equal to described predetermined power consumption threshold value, controlling described display screen, to show described temperature be current circuit board temperature;
Wherein, the current value of base band signal processing chip detection of handset inside, and extrapolate described current power consumption according to current value;
Described base band signal processing chip obtains described temperature according to following equation:
Wherein, T is described temperature, and B is heat sensitive index, T
0be the kelvin rating of 25 DEG C, R
0described built-in thermistor the resistance value of 25 DEG C, V
rdescribed voltage drop value, V
pthe constant voltage values that described constant voltage source exports, R
1the resistance value of described first divider resistance, R
2it is the resistance value of described second divider resistance.
2. mobile phone according to claim 1, is characterized in that, described analog to digital converter is integrated in described base band signal processing chip.
3. mobile phone according to claim 1, is characterized in that, described Subscriber Interface Module SIM is keyboard, touch-screen or acoustic control input module.
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| CN102984326A (en) * | 2012-11-08 | 2013-03-20 | 深圳桑菲消费通信有限公司 | Mobile terminal and battery detecting method thereof |
| CN103196574B (en) * | 2013-03-20 | 2015-10-14 | 小米科技有限责任公司 | The method of measures ambient temperature and device |
| CN107238447A (en) * | 2017-05-31 | 2017-10-10 | 深圳天珑无线科技有限公司 | The method and its system of detecting real-time environment temperature |
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| CN101806641B (en) * | 2010-03-18 | 2013-01-16 | 中兴通讯股份有限公司 | Device and method for realizing overheating prompt of mobile terminal |
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| US6518782B1 (en) * | 2000-08-29 | 2003-02-11 | Delta Design, Inc. | Active power monitoring using externally located current sensors |
| CN1549652A (en) * | 2003-05-22 | 2004-11-24 | 华为技术有限公司 | Earphone for realizing temperaure measuring function of electronic products |
| CN2831632Y (en) * | 2005-08-31 | 2006-10-25 | 中兴通讯股份有限公司 | Cell phone having function of measuring temp |
| CN201345092Y (en) * | 2009-02-09 | 2009-11-11 | 深圳华为通信技术有限公司 | Writing pen and mobile terminal |
| CN101771428A (en) * | 2010-01-19 | 2010-07-07 | 青岛海信移动通信技术股份有限公司 | Temperature detection circuit and mobile communication equipment |
| CN102118472A (en) * | 2010-12-17 | 2011-07-06 | 惠州Tcl移动通信有限公司 | Mobile phone thermometer and circuit for realizing temperature measurement by using mobile phone |
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| CN102361488A (en) | 2012-02-22 |
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