CN109085408A - The method of battery voltage detection circuit and maintenance cdma communication waveform, medium - Google Patents
The method of battery voltage detection circuit and maintenance cdma communication waveform, medium Download PDFInfo
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- CN109085408A CN109085408A CN201810980139.5A CN201810980139A CN109085408A CN 109085408 A CN109085408 A CN 109085408A CN 201810980139 A CN201810980139 A CN 201810980139A CN 109085408 A CN109085408 A CN 109085408A
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- voltage
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- mobile terminal
- cell voltage
- cdma
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
Abstract
The invention discloses battery voltage detection circuit and the methods for maintaining cdma communication waveform, medium, method includes the first voltage V1 for the node that central processing unit is detected by timing between cell voltage associated resistance RM and first resistor R1, and the battery voltage value of mobile terminal is obtained according to the cell voltage of cell voltage associated resistance RM and voltage V1 relation table, then cell voltage situation is monitored by battery voltage detector, according to the reference voltage of the high low adjustment CDMA of cell voltage, to realize in different cell voltages, the reference voltage of CDMA is different, to keep the waveform of CDMA, to meet communication requirement, promote communication success rate.
Description
Technical field
The present invention relates to technical field of mobile terminals more particularly to a kind of battery voltage detection circuit and maintain cdma communication
The method of waveform, medium.
Background technique
With the development of mobile communication and the raising of living standards of the people, CDMA becomes domestic major mobile communication skill
Art, since CDMA is communicated using Pure numerical form, waveform requirements when for communication are stringenter, logical compared to traditional GSM
Letter, if the edge and level of communication waveforms and the waveform of actual requirement have different, will cause communication failure.It is mobile whole
End using battery due to being powered, when cell voltage is high or low, the reference level of CDMA can difference, be easy to cause waveform
Difference occurs and makes communication failure.The prior art stablizes cell voltage using the method for detection battery of mobile terminal voltage,
By timing acquisition cell voltage, corresponding voltage value is calculated by ADC.But timing acquisition cell voltage is needed using fixed
When device be polled, it is inefficient, and communicate success rate it is low.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of cell voltage inspection
The method of slowdown monitoring circuit and maintenance cdma communication waveform, medium, it is intended to be adjusted automatically according to the cell voltage situation of current mobile terminal
The reference voltage of CDMA is saved, so that the reference voltage of CDMA follows the variation of cell voltage and changes, it is full to keep CDMA waveform
Sufficient communication requirement promotes communication success rate, facilitates user.
The technical proposal for solving the technical problem of the invention is as follows:
The present invention provides a kind of battery voltage detection circuit, is applied to mobile terminal comprising:
Inductive component, the inductive component include cell voltage associated resistance (RM), first resistor (R1), second resistance (R2),
3rd resistor (R3), the first variable resistance (Ra) and the second adjustable resistance (Rb), described cell voltage associated resistance (RM) one end
The voltage Vref being connected and fixed, the other end are grounded (GND) by the first resistor (R1), the first variable resistance (Ra) and second
Both ends are separately connected supply voltage (Vref), ground connection (GND), the second adjustable resistance (Rb) and 3rd resistor after resistance (R2) series connection
(R3) both ends are separately connected supply voltage (Vref), ground connection (GND) after connecting；
First comparator, the first comparator include the first input pin (IN1), the second input pin (IN2) and the first output pin
(OUT1), first input pin (IN1) is connected to the node between cell voltage associated resistance (RM) and first resistor (R1)
(A), second input pin (IN2) is connected to the node (B) between the first variable resistance (Ra) and second resistance (R2)；
Second comparator, second comparator include third input pin (IN3), the 4th input pin (IN4) and the second output pin
(OUT2), the third input pin (IN3) is connected to the node (C) between the second adjustable resistance (Rb) and 3rd resistor (R3),
4th input pin (IN4) is connected to the node (A) between cell voltage associated resistance (RM) and first resistor (R1)；And
Central processing unit, the central processing unit include setter and battery voltage detector, and the setter is connected to described
Battery voltage detector, and the setter is connected to first variable resistance (Ra), the second adjustable resistance (Rb), the electricity
Cell voltage detector is connected to first output pin (OUT1) and the second output pin (OUT2), for obtaining the first output pin
(OUT1) and the level signal of the second output pin (OUT2) output, the setter are obtained according to the battery voltage detector
Level signal changes the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb).
The inductive component is connected to the first comparator and the second comparator, with the first comparator and
The central processing unit that two comparators are separately connected is connected to the inductive component.
The battery voltage detection circuit, wherein the cell voltage associated resistance (RM) and first resistor (R1) it
Between node (A) at first voltage (V1), V1=Vref*R1/ (RM+R1).
The battery voltage detection circuit, wherein the cell voltage associated resistance (RM) and cell voltage are in negative
It closes.
The present invention also provides the cdma communication waveforms that battery voltage detection circuit described in a kind of application maintains mobile terminal
Method, method the following steps are included:
When mobile terminal-opening, directly acquire at the node between cell voltage associated resistance (RM) and first resistor (R1)
The value of first voltage (V1)；
The value (T0) of the cell voltage of mobile terminal when being switched on is determined according to first voltage (V1)；
Adjust the first variable resistance (Ra), the resistance value of the second adjustable resistance (Rb) makes second voltage (V2) at node (B), V2=V
(T0+1), the tertiary voltage (V3) at node (C), V3=V(T0-1), wherein V(T0) when indicating that cell voltage is T0, battery electricity
Press the voltage of the node (A) between associated resistance (RM) and first resistor (R1)；
The level signal that battery voltage detector obtains is obtained, and detects whether level signal is high level, if so, adjustment
The reference voltage of CDMA, or pass through setter adjusting the first variable resistance (Ra), the resistance value of the second adjustable resistance (Rb).
The method of the cdma communication waveform of the maintenance mobile terminal, wherein the acquisition battery voltage detector obtains
The level signal taken, and detect whether level signal is high level, if so, the reference voltage of adjustment CDMA, or by setting
The step of device adjusts the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb) is set to specifically include:
The level signal for obtaining battery voltage detector and obtaining, and detect whether level signal is high level；
Determine the output source of high level；
If high level is exported by the first output pin (OUT1), illustrates that the cell voltage of mobile terminal is greater than T0+1, turn down CDMA
Reference voltage, or increase the first variable resistance (Ra), the second adjustable resistance (Rb) resistance value；If high level is by the first output pin
OUT2 output then illustrates that the cell voltage of mobile terminal is less than T0-1, the reference voltage of CDMA is turned up, or reducing first can power transformation
Hinder the resistance value of (Ra), the second adjustable resistance (Rb).
The method of the cdma communication waveform of the maintenance mobile terminal, wherein if the high level is by the first output pin
(OUT1) it exports, then illustrates that the cell voltage of mobile terminal is greater than T0+1, turn down the reference voltage of CDMA, or increase first and can be changed
Resistance (Ra), the second adjustable resistance (Rb) resistance value specifically include:
If T0+1 is in the preset range of cell voltage, the reference voltage of CDMA is turned down, otherwise, T0=T0+1 is enabled, makes V2=V
(T0+1), V3=V(T0-1), to increase the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb)；
The method of the cdma communication waveform of the maintenance mobile terminal, wherein if the high level is by the first output pin OUT2
Output then illustrates that the cell voltage of mobile terminal is less than T0-1, the reference voltage of CDMA is turned up, or reduce the first variable resistance
(Ra), the resistance value of the second adjustable resistance (Rb) specifically includes:
If T0-1 is in the preset range of cell voltage, the reference voltage of CDMA is turned up, otherwise, enables T0=T0-1, makes V2=V
(T0+1), V3=V(T0-1), to reduce the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb).
The method of the cdma communication waveform of the maintenance mobile terminal, wherein described to be determined according to first voltage (V1)
The value (T0) of the cell voltage of mobile terminal specifically includes when booting:
Memory is read, the value (T0) of the cell voltage of mobile terminal when determining booting, wherein the memory is stored with battery
The mapping table of the voltage at node between voltage, cell voltage associated resistance (RM) and first resistor (R1).
The present invention also provides a kind of mobile terminals, which is characterized in that including
Battery voltage detection circuit is battery voltage detection circuit described above；And
Memory, is connected to central processing unit, and the memory is stored with cell voltage, cell voltage associated resistance (RM) and the
The program of the cdma communication waveform of the mapping table and maintenance mobile terminal of the voltage at node between one resistance (R1),
The cdma communication waveform program for maintaining mobile terminal is executed by the central processing unit for realizing maintenance described above
The method of the cdma communication waveform of mobile terminal.
The present invention also provides a kind of machine readable storage mediums, are stored thereon with computer program, the computer program quilt
Central processing unit realizes the cdma communication waveform of maintenance mobile terminal described above method when executing.
The utility model has the advantages that
The invention discloses battery voltage detection circuit and the method for cdma communication waveform, medium are maintained, method includes center
Processor passes through the node between battery voltage detection circuit timing detection cell voltage associated resistance RM and first resistor R1
Voltage V1, and the cell voltage of mobile terminal is obtained according to the cell voltage of cell voltage associated resistance RM and voltage V1 relation table
Value, then by battery voltage detector monitoring cell voltage situation, according to the reference voltage of the high low adjustment CDMA of cell voltage,
To realize in different cell voltages, the reference voltage of CDMA is different, to keep the waveform of CDMA, to meet communication need
It asks, promotes communication success rate.
Detailed description of the invention
Fig. 1 is that the invention discloses a kind of structural block diagrams of the battery voltage detection circuit of mobile terminal；
Fig. 2 is the process of the method for the maintenance mobile terminal cdma communication waveform that the present invention is applied to battery voltage detection circuit
Figure；
Fig. 3 is mobile terminal preferred embodiment functional schematic block diagram of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
The embodiment of the present invention is based on CDMA technology to realize technical solution of the present invention.
CDMA(Code Division Multiple Access, abbreviation CDMA) technology made in wireless telecommunications
Technology, CDMA allow all users while issuing signal using whole frequency bands (1.2288Mhz), and other users
It is considered as noise, need not be collided completely in view of signal.Speech coding technology provided in CDMA, communication quality is better than current GSM,
Ambient noise when user session can be reduced, make to converse apparent.For security performance, CDMA not only has good certification
System distinguishes user with code more because of its transmission characteristic, and the antitheft ability of listening greatly enhances.
Embodiment one
Referring to Figure 1, Fig. 1 is that the invention discloses a kind of structural block diagrams of the battery voltage detection circuit of mobile terminal, such as Fig. 1
Shown, a kind of battery voltage detection circuit is applied to mobile terminal, and the battery voltage detection circuit includes:
Inductive component 100, the inductive component 100 include cell voltage associated resistance RM, first resistor R1, second resistance R2,
3rd resistor R3, the first variable resistance Ra and the second adjustable resistance Rb, described one end cell voltage associated resistance RM are connected and fixed
Supply voltage Vref, the other end is grounded GND by the first resistor R1, and the first variable resistance Ra connects with second resistance R2
Both ends are separately connected supply voltage Vref, ground connection GND afterwards, and both ends connect respectively after the second adjustable resistance Rb connects with 3rd resistor R3
Meet supply voltage Vref, ground connection GND；
First comparator 300, the first comparator 300 include the first input pin IN1, the second input pin IN2 and the first output
Foot OUT1, the first input pin IN1 are connected at node A, A between cell voltage associated resistance RM and first resistor R1
Voltage indicates that the second input pin IN2 is connected to node B, B between the first variable resistance Ra and second resistance R2 with V1
Place's voltage is indicated with V2；
Second comparator 400, second comparator 400 include third input pin IN3, the 4th input pin IN4 and the second output
Foot OUT2, the third input pin IN3 are connected to voltage at node C, C between the second adjustable resistance Rb and 3rd resistor R3
It is indicated with V3, the 4th input pin IN4 is connected to the node A between cell voltage associated resistance RM and first resistor R1, A
Place's voltage is indicated with V1；And
Central processing unit 200, including setter 201 and battery voltage detector 202, the setter 201 are connected to the electricity
Cell voltage detector 202, and the setter 201 is connected to the first variable resistance Ra, the second adjustable resistance Rb, the electricity
Cell voltage detector 202 is connected to the first output pin OUT1 and second comparator 400 of the first comparator 300
The second output pin OUT2, for obtain the first output pin OUT1 and the second output pin OUT2 output level signal, it is described to set
It sets device 201 and first variable resistance Ra, the second adjustable resistance is changed according to the level signal that the battery voltage detector 202 obtains
The resistance value of Rb, so as to adjust the voltage swing of V2, V3.
In Fig. 1, the inductive component 100 is connected to the first comparator 300 and the second comparator 400, with
The central processing unit 200 that the first comparator 300 and the second comparator 400 are separately connected is connected to the inductive component
100。
Specifically, first comparator 300 is identical as the structure of the second comparator 400, includes two input pins IN1, IN2
(or IN3, IN4) and output pin OUT1(OUT2), when voltage, that is, V1 voltage of the first input pin IN1 is greater than the second input
Voltage, that is, V2 voltage of foot IN2, then the first output pin OUT1 exports high level, otherwise the first output pin OUT1 then exports low electricity
It is flat or
When voltage, that is, V3 voltage of third input pin IN3 is greater than voltage, that is, V1 voltage of the 4th input pin IN4, then second is defeated
Foot OUT2 exports high level out；Otherwise the second output pin OUT2 then exports low level.
At this point, battery voltage detector 202 is believed according to the level that the first output pin OUT1 and the second output pin OUT2 is exported
Number inform setter make corresponding setting, with by setter change the first variable resistance Ra, the second adjustable resistance Rb resistance
Value adjusts the voltage V2 and V3 of node B, node C, so that the cell voltage of mobile terminal is monitored, so that when cell voltage is excessively high
Or corresponding response is made when too low, for example, according to the reference voltage of the high low adjustment CDMA of cell voltage, to realize in difference
Cell voltage when, the reference voltage of CDMA is different, to keep the waveform of CDMA.Specifically, it when cell voltage is too low, is turned up
The reference voltage of CDMA turns down the reference voltage of CDMA when cell voltage is excessively high.
As shown in Figure 1, first resistor R1, second resistance R2 and 3rd resistor R3 are the fixed resistance of resistance value, first can
It is the unfixed resistance of resistance value that power transformation, which hinders Ra and the second adjustable resistance Rb, is controlled by setter 201, cell voltage associated resistance RM
It is negative cell voltage coefficient, i.e., the described cell voltage associated resistance RM and cell voltage are negatively correlated, and according to resistance, supplier is mentioned
The resistance value of the cell voltage associated resistance RM of confession and the relationship of cell voltage, so that it may obtain the first electricity under different cell voltages
The value for pressing V1, the value of V1, by the formula it is found that cell voltage is bigger, V1's are calculated by V1=Vref*R1/ (RM+R1)
Voltage is bigger.
In the present invention, mobile terminal is stored at the node A between cell voltage associated resistance RM and first resistor R1
First voltage V1 mapping table.The mapping table records each integer battery of mobile terminal voltage T and its correspondence
Node A at first voltage V1 value, for example, when cell voltage is T, the voltage value V(T of V1 in the mapping table)
It indicates.
Specifically, by above-mentioned battery voltage detection circuit for realizing the method for maintaining mobile terminal cdma communication waveform
Step, Fig. 2 illustrate the method that the present invention is applied to the maintenance mobile terminal cdma communication waveform of battery voltage detection circuit, such as
Shown in Fig. 2, method includes the following steps:
S100 is directly acquired at the node between cell voltage associated resistance RM and first resistor R1 when mobile terminal-opening
Voltage, i.e. first voltage V1 at A.
Specifically, after mobile terminal starting, battery voltage detection circuit detects the initial voltage V1 at node A, for leading to
The mapping table for the voltage at node crossed between inquiry cell voltage associated resistance RM and first resistor R1 determines mobile whole
The initial cell voltage at end.
S200 determines the cell voltage T0 of mobile terminal when being switched on according to first voltage V1；
Specifically, after mobile terminal starts, the initial voltage at A detected in obtaining step S100, i.e. first voltage V1
Value, read memory, according to the mapping table search battery of mobile terminal voltage and first voltage V1 relationship, obtain
The value of the cell voltage of mobile terminal when booting, indicates to be worth with T0.
S300 adjusts the first variable resistance Ra, the resistance value of the second adjustable resistance Rb makes second voltage V2=V of node at B
(T0+1), at C node tertiary voltage V3=V(T0-1), wherein V(T0) indicate cell voltage be T0 when, cell voltage association
The value of the first voltage V1 of node between resistance RM and first resistor R1.
Specifically, the value of cell voltage when obtaining mobile terminal-opening, and obtain first resistor R1, second resistance R2
Resistance value and voltage Vref(, that is, supply voltage or supply voltage) value, then according to series circuit current is equal and parallel circuit
The equal characteristic of voltage, adjusts the first variable resistance Ra by setter 201 in battery voltage detection circuit, second can power transformation
Hinder the resistance value of Rb so that at B node second voltage V2=V(T0+1), tertiary voltage V3=V(T0-1 of node at C), i.e., first
Variable resistance:
,
The second adjustable resistance:
。
Wherein, V(T0+1) indicate in mapping table cell voltage be T0+1 when, the value of first voltage V1；V(T0-1)
When indicating that cell voltage is T0-1 in mapping table, the value of first voltage V1.
S400 obtains the level signal that battery voltage detector obtains, and detects whether level signal is high level, if
It is then to adjust the reference voltage of CDMA, or the resistance of the first variable resistance Ra, the second adjustable resistance Rb is adjusted by setter
Value.
Specifically, after mobile terminal starting a period of time, when battery voltage detector receives the of first comparator 300
When one output pin OUT1 exports high level, show at the cell voltage T0(A of mobile terminal at this time) it is greater than cell voltage T0+1(B
Place), whether the value for detecting cell voltage T0+1 at this time is in the preset range of mobile terminal, if so, turning down the reference of CDMA
Voltage automatically adjusts the resistance of the first variable resistance Ra, the second adjustable resistance Rb by setter 201 if it is not, then enabling T0=T0+1
Value, so that V2=V(T0+1), V3=V(T0-1), at this point,
First variable resistance:
,
The second adjustable resistance:
；Or
When the second output pin OUT2 that battery voltage detector receives the second comparator 400 exports high level, show at this time
At the cell voltage T0(A of mobile terminal) be less than at cell voltage T0-1(C), whether the value for detecting cell voltage T0-1 at this time is located
In the preset range of mobile terminal, if so, the reference voltage that CDMA is turned up passes through setter 201 if it is not, then enabling T0=T0-1
The resistance value for automatically adjusting the first variable resistance Ra, the second adjustable resistance Rb, so that V2=V(T0+1), V3=V(T0-1),
First variable resistance at this time:
,
The second adjustable resistance:
。
That is step S400 specifically includes the following steps:
S401, the level signal for obtaining battery voltage detector and obtaining, and detect whether level signal is high level；
S402 determines the output source of high level；
S403 illustrates that the cell voltage of mobile terminal is greater than T0+1, turns down if high level is exported by the first output pin OUT1
The reference voltage of CDMA, or increase the resistance value of the first variable resistance Ra, the second adjustable resistance Rb；Or
S404 illustrates that the cell voltage of mobile terminal is less than T0-1, is turned up if high level is exported by the first output pin OUT2
The reference voltage of CDMA, or reduce the resistance value of the first variable resistance Ra, the second adjustable resistance Rb.
Wherein, step S403 is specifically included: if T0+1 is in the preset range of cell voltage, turning down the reference of CDMA
Otherwise voltage enables T0=T0+1, make V2=V(T0+1), V3=V(T0-1), thus increase the first variable resistance Ra, second can power transformation
Hinder the resistance value of Rb；
Step S404 is specifically included: if T0-1 is in the preset range of cell voltage, the reference voltage of CDMA is turned up, it is no
Then, T0=T0-1 is enabled, V2=V(T0+1 is made), V3=V(T0-1), thus the first variable resistance Ra of reduction, the second adjustable resistance Rb
Resistance value.
Embodiment two
The embodiment of the invention also provides a kind of mobile terminals, as shown in figure 3, the mobile terminal of the embodiment of the present invention can be hand
Machine (or plate), wherein the mobile terminal of the present embodiment includes battery voltage detection circuit (not indicating in figure), central processing
Device 200 and the memory 500 being connect with the central processing unit 200；
The battery voltage detection circuit is the battery voltage detection circuit in above-described embodiment one.
The memory 500 is stored with the node between cell voltage, cell voltage associated resistance RM and first resistor R1
The mapping table of the voltage at place, and the cdma communication waveform program of mobile terminal is maintained, the maintenance mobile terminal
The cdma communication waveform side of mobile terminal is maintained when cdma communication waveform program is executed by the central processing unit 200
Method, as detailed above step S100 to S400.
Central processing unit 200(Central the Processing Unit, CPU) for running the memory 500
The program code or processing data of middle storage, such as execute the cdma communication waveform program etc. for maintaining mobile terminal.
Embodiment three
The present invention also provides a kind of machine readable storage mediums, are stored thereon with computer program, and the computer program is central
The method of the cdma communication waveform of maintenance mobile terminal described in above-mentioned steps S100 to S400 is realized when processor executes；Specifically
As described above.
In conclusion the present invention passes through a kind of battery voltage detection circuit that provides and the side for maintaining cdma communication waveform
Method, medium, the battery voltage detection circuit include inductive component, first comparator, the second comparator and central processing unit,
Applied to mobile terminal, for realizing the method for the cdma communication waveform for maintaining mobile terminal, method includes central processing unit
Pass through the first electricity of the node between battery voltage detection circuit timing detection cell voltage associated resistance RM and first resistor R1
V1 is pressed, and the battery electricity of mobile terminal is obtained according to the cell voltage of cell voltage associated resistance RM and first voltage V1 relation table
Then pressure value monitors cell voltage situation by battery voltage detector, according to the reference of the high low adjustment CDMA of cell voltage electricity
Pressure, to realize in different cell voltages, the reference voltage of CDMA is different, to keep the waveform of CDMA, to meet communication
Demand promotes communication success rate.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of battery voltage detection circuit is applied to mobile terminal characterized by comprising
Inductive component, the inductive component include cell voltage associated resistance (RM), first resistor (R1), second resistance (R2),
3rd resistor (R3), the first variable resistance (Ra) and the second adjustable resistance (Rb), described cell voltage associated resistance (RM) one end
The voltage Vref being connected and fixed, the other end are grounded (GND) by the first resistor (R1), the first variable resistance (Ra) and second
Both ends are separately connected supply voltage (Vref), ground connection (GND), the second adjustable resistance (Rb) and 3rd resistor after resistance (R2) series connection
(R3) both ends are separately connected supply voltage (Vref), ground connection (GND) after connecting；
First comparator, the first comparator include the first input pin (IN1), the second input pin (IN2) and the first output pin
(OUT1), first input pin (IN1) is connected to the node between cell voltage associated resistance (RM) and first resistor (R1)
(A), second input pin (IN2) is connected to the node (B) between the first variable resistance (Ra) and second resistance (R2)；
Second comparator, second comparator include third input pin (IN3), the 4th input pin (IN4) and the second output pin
(OUT2), the third input pin (IN3) is connected to the node (C) between the second adjustable resistance (Rb) and 3rd resistor (R3),
4th input pin (IN4) is connected to the node (A) between cell voltage associated resistance (RM) and first resistor (R1)；And
Central processing unit, the central processing unit include setter and battery voltage detector, and the setter is connected to described
Battery voltage detector, and the setter is connected to first variable resistance (Ra), the second adjustable resistance (Rb), the electricity
Cell voltage detector is connected to first output pin (OUT1) and the second output pin (OUT2), for obtaining the first output pin
(OUT1) and the level signal of the second output pin (OUT2) output, the setter are obtained according to the battery voltage detector
Level signal changes the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb);
The inductive component is connected to the first comparator and the second comparator, compares with the first comparator and second
The inductive component is connected to compared with the central processing unit that device is separately connected.
2. battery voltage detection circuit according to claim 1, which is characterized in that the cell voltage associated resistance (RM)
The first voltage (V1) at node (A) between first resistor (R1), V1=Vref*R1/ (RM+R1).
3. battery voltage detection circuit according to claim 2, which is characterized in that the cell voltage associated resistance (RM)
It is negatively correlated with cell voltage.
4. a kind of side for the cdma communication waveform for maintaining mobile terminal using battery voltage detection circuit described in claim 1
Method, which comprises the following steps:
When mobile terminal-opening, directly acquire at the node between cell voltage associated resistance (RM) and first resistor (R1)
The value of first voltage (V1)；
The value (T0) of the cell voltage of mobile terminal when being switched on is determined according to first voltage (V1)；
Adjust the first variable resistance (Ra), the resistance value of the second adjustable resistance (Rb) makes second voltage (V2) at node (B), V2=V
(T0+1), the tertiary voltage (V3) at node (C), V3=V(T0-1), wherein V(T0) when indicating that cell voltage is T0, battery electricity
Press the voltage of the node (A) between associated resistance (RM) and first resistor (R1)；
The level signal that battery voltage detector obtains is obtained, and detects whether level signal is high level, if so, adjustment
The reference voltage of CDMA, or pass through setter adjusting the first variable resistance (Ra), the resistance value of the second adjustable resistance (Rb).
5. the method for the cdma communication waveform according to claim 4 for maintaining mobile terminal, which is characterized in that the acquisition
The level signal that battery voltage detector obtains, and detect whether level signal is high level, if so, the reference of adjustment CDMA
Voltage, or the step of adjusting the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb) by setter specifically include:
The level signal for obtaining battery voltage detector and obtaining, and detect whether level signal is high level；
Determine the output source of high level；
If high level is exported by the first output pin (OUT1), illustrates that the cell voltage of mobile terminal is greater than T0+1, turn down CDMA
Reference voltage, or increase the first variable resistance (Ra), the second adjustable resistance (Rb) resistance value；If high level is by the first output pin
OUT2 output then illustrates that the cell voltage of mobile terminal is less than T0-1, the reference voltage of CDMA is turned up, or reducing first can power transformation
Hinder the resistance value of (Ra), the second adjustable resistance (Rb).
6. the method for the cdma communication waveform according to claim 5 for maintaining mobile terminal, which is characterized in that if described high
Level is exported by the first output pin (OUT1), then illustrates that the cell voltage of mobile terminal is greater than T0+1, turns down the reference electricity of CDMA
Pressure, or the resistance value of increase the first variable resistance (Ra), the second adjustable resistance (Rb) specifically include:
If T0+1 is in the preset range of cell voltage, the reference voltage of CDMA is turned down, otherwise, T0=T0+1 is enabled, makes V2=V
(T0+1), V3=V(T0-1), to increase the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb).
7. the method for the cdma communication waveform according to claim 5 for maintaining mobile terminal, which is characterized in that if described high
Level is exported by the first output pin OUT2, then illustrates that the cell voltage of mobile terminal is less than T0-1, the reference voltage of CDMA is turned up,
Or the resistance value of reduction the first variable resistance (Ra), the second adjustable resistance (Rb) specifically includes:
If T0-1 is in the preset range of cell voltage, the reference voltage of CDMA is turned up, otherwise, enables T0=T0-1, makes V2=V
(T0+1), V3=V(T0-1), to reduce the resistance value of the first variable resistance (Ra), the second adjustable resistance (Rb).
8. the method for the cdma communication waveform according to claim 4 for maintaining mobile terminal, which is characterized in that the basis
The value (T0) of the cell voltage of mobile terminal specifically includes when first voltage (V1) determines booting:
Memory is read, the value (T0) of the cell voltage of mobile terminal when determining booting, wherein the memory is stored with battery
The mapping table of the voltage at node between voltage, cell voltage associated resistance (RM) and first resistor (R1).
9. a kind of mobile terminal, which is characterized in that including
Battery voltage detection circuit is the described in any item battery voltage detection circuits of claim 1 ~ 3；And
Memory, is connected to central processing unit, and the memory is stored with cell voltage, cell voltage associated resistance (RM) and the
The program of the cdma communication waveform of the mapping table and maintenance mobile terminal of the voltage at node between one resistance (R1),
The cdma communication waveform program for maintaining mobile terminal is executed by the central processing unit appoints for realizing such as claim 4-8
The method of the cdma communication waveform of mobile terminal is maintained described in one.
10. a kind of machine readable storage medium, is stored thereon with computer program, which is executed by central processing unit
The method of the described in any item cdma communication waveforms for maintaining mobile terminal of Shi Shixian claim 4-8.
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