CN201293986Y - Resistance type touch screen control circuit - Google Patents
Resistance type touch screen control circuit Download PDFInfo
- Publication number
- CN201293986Y CN201293986Y CNU2008201534453U CN200820153445U CN201293986Y CN 201293986 Y CN201293986 Y CN 201293986Y CN U2008201534453 U CNU2008201534453 U CN U2008201534453U CN 200820153445 U CN200820153445 U CN 200820153445U CN 201293986 Y CN201293986 Y CN 201293986Y
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Abstract
The utility model provides a control circuit of a resistive touch panel, which comprises a reference voltage generating circuit module, an ADC analog-to-digital converter module, a channel selection module, an interface IO module and other functional modules for outputting digital signals, wherein a voltage booster circuit module doubles and outputs power supply voltage to supply power for the reference voltage generating circuit module and the ADC analog-to-digital converter module, and enables the power of a single 1.5V battery to be capable of meeting using requirements of the control circuit of the touch panel. Simultaneously, the control circuit of a resistive touch panel has the advantages of low power consumption.
Description
Technical field
The utility model belongs to control circuit, is specifically related to a kind of electric resistance type touch screen control circuit.
Background technology
Resistive touch screen is the input equipment of man-machine interaction occasion, and different with the mouse that can click with the keyboard that can realize input, it can allow the user select by touch screen.Have the communication facilities such as mobile phone, PDA of touch-screen, easy and simple to handle, and can carry out handwriting input.Touch-screen is using more more intuitively than menu operation, and the control chip cost is lower.
Figure 1 shows that prior art electric resistance type touch screen control circuit synoptic diagram.As shown in Figure 1, electric resistance type touch screen control circuit 10 comprises functional module 15, channel selecting 14, the interface IO module 13 of reference voltage generating circuit module 11, ADC analog to digital converter 12, other output digital signals.All modules all by with power supply V
DDConnecting provides power supply, wherein, ADC analog to digital converter 12 and all be mimic channel for the ADC analog to digital converter provides the reference voltage generating circuit module 11 of reference voltage V ref, ADC analog to digital converter 12 and reference voltage generating circuit module 11 require to provide a certain size operating voltage, generally require more than 2.2V at present, therefore the minimum operating voltage of touch screen control circuit generally all requires more than 2.2V, and this has just limited the further reduction of the power consumption of touch screen control circuit.
Simultaneously, resistive touch screen is widely used in hand-held product, substantially all be to adopt powered battery, and all be to adopt single-unit 1.5V powered battery in a lot of occasions, but the minimum operating voltage of touch screen control circuit in the market can only arrive 2.2V, and these products all can not satisfy the applicable cases of monocell powering mode.
The utility model content
The technical problems to be solved in the utility model is: a kind of electric resistance type touch screen control circuit that can single-unit 1.5V is battery powered, power consumption is lower is provided.
For solving the problems of the technologies described above, the touch screen control circuit that the utility model provides comprises the functional module of reference voltage generating circuit module, ADC analog to digital converter module, channel selecting module, interface IO module, other output digital signals, and the functional module of channel selecting module, interface IO module and other output digital signals all directly is connected with power supply and realizes power supply by power supply; Wherein, described touch screen control circuit also comprises the booster circuit module that is connected with power supply, and described reference voltage generating circuit module all is connected with the booster circuit module with ADC analog to digital converter module, and realizes power supply by the output voltage of booster circuit module.
According to the electric resistance type touch screen control circuit that the utility model provides, wherein, described power supply can be the battery of single-unit 1.5V voltage, battery or other battery greater than 1.5V voltage of binodal 1.5V voltage; The functional module of described other output digital signals comprises battery voltage detection module and oscillator, described battery voltage detection module output is connected in the booster circuit module, described oscillator module output is connected in the booster circuit module, and described oscillator module output is connected in ADC analog to digital converter module; Described oscillator module is to the clock signal of booster circuit module output 1MHz oscillation frequency, and described oscillator module is to the clock signal of ADC analog to digital converter module output 2MHz oscillation frequency.
According to the electric resistance type touch screen control circuit that the utility model provides, wherein, described selector channel module selects the simulating signal of input to export ADC analog to digital converter module to; Described interface IO module receiving digital signals, the output signal of described touch screen control circuit is exported in parallel series.
According to the electric resistance type touch screen control circuit that the utility model provides, wherein, the output voltage of described booster circuit module is the twice of supply voltage.Described booster circuit module comprises two identical electric capacity that are connected in series, and realizes doubly rising of booster circuit module output voltage by alternately discharging and recharging of electric capacity.
Technique effect of the present utility model is: by the booster circuit module to supply voltage boost doubly rise output after, can satisfy the requirement of the high input voltage of reference voltage generating circuit module and ADC analog to digital converter module in the touch screen control circuit, thereby the supply voltage of touch screen control circuit is reduced, make single-unit 1.5V battery supply can satisfy the request for utilization of touch screen control circuit.Simultaneously, electric resistance type touch screen control circuit has characteristics low in energy consumption.
Description of drawings
Fig. 1 is the block scheme of prior art electric resistance type touch screen control circuit;
Fig. 2 is the circuit block diagram of the preferred implementation of the utility model electric resistance type touch screen control circuit;
Fig. 3 is the circuit block diagram of the another embodiment of the utility model electric resistance type touch screen control circuit;
Fig. 4 is the preferred implementation circuit theory diagrams of the booster circuit module of the utility model electric resistance type touch screen control circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
Figure 2 shows that the circuit block diagram of the preferred implementation of the utility model electric resistance type touch screen control circuit.As shown in Figure 2, electric resistance type touch screen control circuit 20 comprises the functional module 25 and the booster circuit module 26 of reference voltage generating circuit module 21, ADC analog to digital converter module 22, channel selecting module 24, interface IO module 23, other output digital signals.Interface IO module 23 is used for the input of digital signal and the output of electric resistance type touch screen control circuit 20, and its output I2C interface is connected in interface IO module 23; ADC analog to digital converter module 22 realizes that an analog signal conversion to input is a digital signal, and the reference voltage V ref of reference voltage generating circuit module 21 exports ADC analog to digital converter module 22 to; Because the ADC analog to digital converter can only handle an analog input amount simultaneously, therefore need channel selecting module 24 to select a certain road analog signal transmission in the simulating signal input to ADC analog to digital converter module 22.By power supply V
DDTo electric resistance type touch screen control circuit 20 power supplies, wherein, power supply V
DDBeing connected and voltage is provided with the functional module 25 of channel selecting module 24, interface IO module 23 and other output digital signals is V
DDPower supply, in the present embodiment, power supply V
DDBe the direct supply of the single battery of 1.5V, V
DDMagnitude range is 1.3V～1.6V; Simultaneously, booster circuit module 26 also with power supply V
DDConnect, power supply provides the direct supply of 1.3V～1.6V to import to booster circuit module 26, and after realizing boosting through the booster circuit module, its output voltage is V
EEThe output voltage V of booster circuit module 26
EEOutput is connected in reference voltage generating circuit module 21, ADC analog to digital converter module 22.After booster circuit module 26, output voltage V
EEBe input voltage V
DDTwice, i.e. V
EE=2V
DD, therefore can satisfy the high input voltage requirement of reference voltage generating circuit module 21 and 22 two analog modules of ADC analog to digital converter module.
Figure 3 shows that the circuit block diagram of the another embodiment of the utility model electric resistance type touch screen control circuit.In conjunction with Fig. 2 and shown in Figure 3, difference embodiment illustrated in fig. 3 is that the functional module 25 of other output digital signals comprises battery voltage detection module 251 and oscillator 252; Wherein battery voltage detection module 251 is by power supply V
DDPower supply, the output control line of battery voltage detection module 251 is connected in booster circuit module 26, whether the startup of booster circuit module 26 is decided by battery voltage detection module 251, have only when finding that cell voltage is lower than 2.2V (the minimum input voltage that reference voltage generating circuit module and ADC analog to digital converter module require), booster circuit module 26 just can start work.When booster circuit is idle, V
EEEqual V
DD, so the power supply in the present embodiment can be the power supply of single-unit 1.5V, also can be two joints or above 1.5V power supply or other battery greater than 1.5V voltage of two joints; Oscillator 252 is connected in power supply V
DD, its input voltage is V
DD, its output is connected to ADC analog to digital converter module 22 and booster circuit module 26, and the clock of ADC analog to digital converter module 2MHz sampling clock frequency is provided, and the clock of booster circuit module 1MHz sampling clock frequency is provided.
Figure 4 shows that the preferred implementation circuit theory diagrams of the booster circuit module of the utility model electric resistance type touch screen control circuit.As shown in Figure 4, the booster circuit module comprises P1, P2, P3, P4, six switch MOS pipes of P5, N1 and two capacitor C that is connected in series 1, C2 that parameter is identical.Wherein, P2, P3 pipe are connected in series, the source termination power V of P2 pipe
DD, the drain terminal of P3 pipe connects first end of capacitor C 1; P5, N1 manage and are connected in series the source termination power V of P5 pipe
DD, first end of the source termination capacitor C1 of the drain terminal of P5 pipe, N1 pipe, the drain terminal ground connection of N1 pipe; The source termination power VDD of P1 pipe, the drain terminal of P1 pipe connects first end of capacitor C 2; The P4 pipe places between capacitor C 1 and the capacitor C 2, second end of the source termination capacitor C1 of P4, and the drain terminal of P4 connects first end of capacitor C 2, the second end ground connection of capacitor C 2; First end of capacitor C 2 is the output terminal V of booster circuit module
EEP1, P2, P3, P4, P5 are depletion type P type metal-oxide-semiconductor, turn-off conducting when connecing low level during their control termination high level; N1 is an enhancement mode N type metal-oxide-semiconductor, and conducting during its control termination high level is turn-offed when connecing low level.The booster circuit module also comprises phase inverter 37,38,39 and 40; 38 series connection of phase inverter 37 and phase inverter are divided into clock CK and the CK that the two-way phase differential is 180 degree from the clock signal of the 1MHz of oscillator output by phase inverter 37 and phase inverter 38; Phase inverter 39 and phase inverter 40 series connection enable control signal and are divided into two-way EN and EN by phase inverter 39 and phase inverter 40.The grid of metal-oxide-semiconductor P2 meets EN, and the grid of metal-oxide-semiconductor P1 meets EN, and the grid of metal-oxide-semiconductor P4, P5, N1 meets clock signal C K, and the grid of metal-oxide-semiconductor P3 meets clock signal C K.Therefore during the P1 conducting, P2 closes; During the conducting of P4, P5 pipe, the P3 pipe is closed, and the N1 pipe is closed.As cell voltage V
DD(also being circuit voltage) when being higher than 2.2V, enables control end by the battery detecting module controls, makes EN be changed to high level, P1 pipe conducting this moment, V
EEEqual V
DDAs cell voltage V
DD(also being circuit voltage) is lower than 2.2V, enable control end by the battery detecting module controls, make EN be changed to low level, this moment, CK and CK alternately controlled metal-oxide-semiconductor P3, P4, P5 and N1, capacitor C 1 and C2 are carried out discharging and recharging alternately, by the principle of utilizing electric capacity two ends electric charge not suddenly change, finally realize V
EEBoost to the V of twice
DDVoltage.
Under the situation that does not depart from spirit and scope of the present utility model, can also constitute many very embodiment of big difference that have.Should be appreciated that except as defined by the appended claims, the utility model is not limited at the specific embodiment described in the instructions.
Claims (8)
1. electric resistance type touch screen control circuit, comprise the reference voltage generating circuit module, ADC analog to digital converter module, channel selecting module, interface IO module, the functional module of other output digital signals, channel selecting module, the functional module of interface IO module and other output digital signals all directly is connected with power supply and realizes power supply by power supply, it is characterized in that, described touch screen control circuit also comprises the booster circuit module that is connected with power supply, described reference voltage generating circuit module all is connected with the booster circuit module with ADC analog to digital converter module, and realizes power supply by the output voltage of booster circuit module.
2. touch screen control circuit according to claim 1 is characterized in that, described power supply is the battery of battery, binodal 1.5V voltage of single-unit 1.5V voltage and other greater than one of battery of 1.5V voltage.
3. touch screen control circuit according to claim 1, it is characterized in that, the functional module of described other output digital signals comprises battery voltage detection module and oscillator module, described battery voltage detection module output is connected in the booster circuit module, described oscillator module output is connected in the booster circuit module, and described oscillator module output is connected in ADC analog to digital converter module.
4. touch screen control circuit according to claim 3, it is characterized in that, described oscillator module is to the clock signal of booster circuit module output 1MHz oscillation frequency, and described oscillator module is to the clock signal of ADC analog to digital converter module output 2MHz oscillation frequency.
5. touch screen control circuit according to claim 1 is characterized in that, described selector channel module selects the simulating signal of input to export ADC analog to digital converter module to.
6. touch screen control circuit according to claim 1 is characterized in that, described interface IO module receiving digital signals, and the output signal of described touch screen control circuit is exported in parallel series.
7. touch screen control circuit according to claim 1 is characterized in that, the output voltage of described booster circuit module is the twice of supply voltage.
8. according to claim 1 or 7 described touch screen control circuits, it is characterized in that described booster circuit module comprises two identical electric capacity that are connected in series, realize doubly rising of booster circuit module output voltage by alternately discharging and recharging of electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201534453U CN201293986Y (en) | 2008-09-24 | 2008-09-24 | Resistance type touch screen control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201534453U CN201293986Y (en) | 2008-09-24 | 2008-09-24 | Resistance type touch screen control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201293986Y true CN201293986Y (en) | 2009-08-19 |
Family
ID=41007470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201534453U Expired - Lifetime CN201293986Y (en) | 2008-09-24 | 2008-09-24 | Resistance type touch screen control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201293986Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262610A (en) * | 2010-05-26 | 2011-11-30 | 上海宏力半导体制造有限公司 | Memory module embedded in system on chip (SOC) and SOC with embedded memory module |
| CN102541386A (en) * | 2010-12-17 | 2012-07-04 | 无锡华润矽科微电子有限公司 | Resistance-type touch screen control circuit and realizing method thereof |
-
2008
- 2008-09-24 CN CNU2008201534453U patent/CN201293986Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262610A (en) * | 2010-05-26 | 2011-11-30 | 上海宏力半导体制造有限公司 | Memory module embedded in system on chip (SOC) and SOC with embedded memory module |
| CN102262610B (en) * | 2010-05-26 | 2015-12-02 | 上海华虹宏力半导体制造有限公司 | Be embedded in the SOC of memory module in SOC and embedded memory module |
| CN102541386A (en) * | 2010-12-17 | 2012-07-04 | 无锡华润矽科微电子有限公司 | Resistance-type touch screen control circuit and realizing method thereof |
| CN102541386B (en) * | 2010-12-17 | 2014-11-19 | 无锡华润矽科微电子有限公司 | Resistance-type touch screen control circuit and realizing method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090819 |
|
| CX01 | Expiry of patent term |