CN206117629U - Power pin multiplex circuit - Google Patents
Power pin multiplex circuit Download PDFInfo
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- CN206117629U CN206117629U CN201621076266.5U CN201621076266U CN206117629U CN 206117629 U CN206117629 U CN 206117629U CN 201621076266 U CN201621076266 U CN 201621076266U CN 206117629 U CN206117629 U CN 206117629U
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Abstract
The application provides a power pin multiplex circuit, emitting diode LED and button S1 concatenate between power BAT and ground GND. Pin KEY connects between emitting diode LED and button S1. This application pin KEY of needs can realize emitting diode LED and button S1's control, has reduced power management chip's cost.
Description
Technical field
The application is related to electronic circuit technology field, more particularly to a kind of power pins multiplex circuit.
Background technology
With the popularization at full speed of smart mobile phone and wearable device, it is lithium battery source control around battery
Chip is more and more.In the application of lithium battery managing chip, such as in portable power source or charging management chip, keypress function and outer
Connecing driving LED illumination function all generally needs, and typically two functions is drawn with two in chip respectively in prior art
Foot as shown in figure 1, such implementation is simple, is pressed when key press detecting circuit detects button realizing, then illumination drives
Drives metal-oxide-semiconductor is turned on or off, so as to controlling the luminous of light emitting diode or extinguishing.Utility model people has found, existing
Control button and illumination drive circuit shortcoming be:Key press detecting circuit and illumination driving circuit are respectively necessary for a pin
To realize, so as to increased the cost of power management chip.
Utility model content
The application provides a kind of power pins multiplex circuit, can only need to a pin KEY and be capable of achieving light-emitting diodes
The control of pipe LED and button S1, reduces the cost of power management chip.
According to the application's in a first aspect, the application provides a kind of power pins multiplex circuit, including：First light-emitting diodes
Pipe LED and the first button S1, also includes：First voltage clamp circuit module, the first current comparator, the first controlling switch S2 with
And first switch M1；The input termination power of the first voltage clamp circuit module, outfan and first controlling switch
The first end connection of S2, the second end of first controlling switch S2 are connected with first switch M1, first switch M1
The other end is grounded, the external pulse width modulating signal of first switch M1；Second end of first controlling switch S2 and institute
The positive input terminal connection of the first current comparator is stated, the negative input end of first current comparator connects default reference current
Signal；Second end of first controlling switch S2 is connected with the first LED negative pole of outside as the first pin KEY
Connect, first LED and the first button S1 are grounded after being connected in series, and first LED is just
Pole is connected with power supply.
According to the second aspect of the application, the application provides a kind of power pins multiplex circuit, a kind of power pins multiplexing
Circuit, including：Second LED ' and the second button S1 ', also include：It is second voltage clamp circuit module, second electric
Stream comparator, the second controlling switch S2 ' and second switch M1 '；A second switch M1 ' termination powers, the other end and institute
State the second controlling switch S2 ' first end connection, second controlling switch S2 ' the second end and second voltage clamper electricity
The input connection of road module, the output head grounding of the second voltage clamp circuit module；The second switch M1 ' is circumscribed with
Pulse width modulating signal；Second controlling switch S2 ' the first termination second current comparator positive input terminal, institute
The negative input end for stating the second current comparator connects default reference current signal；Second controlling switch S2 ' first end
Used as second pin KEY, the positive pole of ' with second LED ' is connected；First termination of the second button S1 '
The negative pole of power supply BAT, the second end and second LED ' positive pole be connected, second LED '
Ground connection.
The power pins multiplex circuit that the application is provided, LED are serially connected in power supply BAT and ground with button S1
Between GND.Pin KEY is connected between LED and button S1.The application only needs to a pin KEY and is capable of achieving
The control of LED and button S1, reduces the cost of power management chip.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the application will become from the description with reference to accompanying drawings below to embodiment
Substantially with it is easy to understand, wherein：
Structural representations of the Fig. 1 for the power circuit of prior art；
Structural representations of the Fig. 2A for the power pins multiplex circuit of the embodiment of the present application one；
Structural representations of Fig. 2 B for another kind of power pins multiplex circuit of the embodiment of the present application one；
Structural representations of Fig. 3 A for the power pins multiplex circuit of the embodiment of the present application two;
Structural representations of Fig. 3 B for another kind of power pins multiplex circuit of the embodiment of the present application two.
Specific embodiment
Accompanying drawing is combined below by specific embodiment to be described in further detail the application.The application provides a kind of,
The control that a pin KEY is capable of achieving LED and button S1 can be only needed to, power management chip is reduced
Cost.
Embodiment one：
As shown in Figure 2 A, a kind of power pins multiplex circuit, including：First LED and the first button S1, also
Including：First voltage clamp circuit module 1, the first current comparator 2, the first controlling switch S2 and first switch M1.
The first end of the input termination power BAT of first voltage clamp circuit module 1, outfan and the first controlling switch S2
Connection, the second end of the first controlling switch S2 are connected with first switch M1, first switch M1 other end ground connection, outside first switch M1
Connect pulse width modulating signal.
Second end of the first controlling switch S2 is connected with the positive input terminal of the first current comparator 2, the first current comparator 2
Negative input end connect default reference current signal.
Second end of the first controlling switch S2 is connected with the first LED negative pole of outside as the first pin KEY
Connect, the first LED and the first button S1 are grounded after being connected in series, the positive pole and power supply of the first LED
BAT connects.
Below the operation principle of the power pins multiplex circuit of the embodiment of the present application is illustrated：
When the power pins multiplex circuit of the application works, when the pulse width modulating signal PWM of input is low level,
First controlling switch S2 is closed, and the first LED does not work.Now, the first pin KEY keys are pressed（First button S1 is closed
Close）, internal first voltage clamp circuit module 1 will limit the cross-pressure of BAT to pin KEY（VBAT_KEY）So that VBAT_
Conduction voltage drops of the KEY less than the first LED.First LED is not turned on, the electricity of the first pin KEY keys
Flow from internal first voltage clamp circuit module 1 and flow through.Internal current sample circuit detects first voltage clamp circuit mould
The electric current that block 1 flows out, is sent in the first current comparator 2, is compared with default reference current signal.When electric current is more than default
During reference current signal, it is judged as that the first pin KEY keys are pressed, the output KEY_S signals of the first current comparator 2, you can
Know that button the first button S1 is pressed.
When input has pulse width modulating signal pwm signal, the conducting of the first LED is shinny.Now, flow through
The electric current of the first LED PWM electric currents also for high frequency, as frequency is higher, human eye is judged as Chang Liang.Believe in PWM
Number for high level when, first switch M1 conducting, the first controlling switch S2 disconnect, electric current from BAT flow through first resistor R1, first
Optical diode LED and first switch M1 to GND.When PWM is low level, the first LED no current flows through.It is this
Under the conditions of, it is low level time section in pwm signal, the first controlling switch S2 closure, the first pin KEY key electric currents of detection work as spy
When the electric current for measuring is more than default reference current signal, it is judged as that the first pin KEY keys are pressed, and sends KEY_S signals.
Preferably, the embodiment of the present application provides a kind of power pins multiplex circuit, and first switch M1 is switched for a mos,
I.e. first switch M1 can specifically include using mos pipes as switch：
First LED and the first button S1, in needing to use chip in traditional circuit, two pins go
Control respectively.Power pins multiplex circuit in application scheme only uses a pin KEY.Fig. 2 B are referred to, Fig. 2 B are
The structural representation of the power pins multiplex circuit of the embodiment of the present application one, as shown in Figure 2 B, the power pins multiplexing of the application
Circuit also includes：First voltage clamp circuit module 1, the first current comparator 2, the first controlling switch S2 and a mos are opened
Close M1.
The input termination power BAT of first voltage clamp circuit module 1, outfan and the first controlling switch S2 ' first
End connection, the drain D that the second end of the first controlling switch S2 switchs M1 with mos are connected, the source S ground connection of mos switch M1,
The external pulse width modulating signal PWM of grid G.
Second end of the first controlling switch S2 is connected with the positive input terminal of the first current comparator 1, the first current comparator 2
Negative input end connect default reference current signal.
Second end of the first controlling switch S2 is connected with the first LED negative pole of outside as the first pin KEY
Connect, the first LED and the first button S1 are grounded GND, positive pole and the electricity of the first LED after being connected in series
Source BAT connects.
As can be seen that the first LED and the first button S1 are serially connected between power supply BAT and ground GND.First draws
Foot KEY is connected between the first LED and the first button S1.The application only needs to a pin KEY and is capable of achieving the
The control of one LED and the first button S1.
In a kind of embodiment, the first LED is connected in series with first resistor R1.Series connection first resistor R1 can be with
Limit the electric current of the first LED, it is ensured that when electric current flows through the first LED place branch road, circuit it is steady
It is qualitative.
In a kind of embodiment, the first button S1 is connected in series with second resistance R2.Series connection second resistance R2 can limit stream
The electric current of the first button S1 is crossed, the stability of circuit is lifted.
When the power pins multiplex circuit of the application works, when the pulse width modulating signal PWM of input is low level,
First controlling switch S2 is closed, and the first LED does not work.
Now, the first pin KEY keys are pressed（First button S1 is closed）, the first voltage clamp circuit module 1 of inside will
Limit the cross-pressure of BAT to pin KEY（VBAT_KEY）So that conduction voltage drops of the VBAT_KEY less than the first LED.
First LED is not turned on, and the electric current of the first pin KEY keys is flow through from internal first voltage clamp circuit module 1.
Internal current sample circuit detects the electric current of the outflow of first voltage clamp circuit module 1, sends in the first current comparator 2,
Compare with default reference current signal.When electric current is more than default reference current signal, it is judged as the first pin KEY key quilts
Press, the output KEY_S signals of the first current comparator 2, you can learn that button the first button S1 is pressed.
When input has pulse width modulating signal pwm signal, the conducting of the first LED is shinny.
Now, the electric current for flowing through the first LED is also the PWM electric currents of high frequency, and as frequency is higher, human eye is sentenced
Break as Chang Liang.When pwm signal is high level, mos switch M1 conductings, the first controlling switch S2 disconnect, and electric current is flowed from BAT
Jing first resistors R1, the first LED and mos switch M1 to GND.When PWM is low level, first luminous two
Pole pipe LED no current flows through.Under the conditions of this, pwm signal be low level time section, the first controlling switch S2 closure, detection
First pin KEY key electric currents, when the electric current for detecting is more than default reference current signal, are judged as the first pin KEY keys
Press, and send KEY_S signals.
Embodiment two：
As shown in Figure 3A, the embodiment of the present application provides a kind of power pins multiplex circuit, including：Second light emitting diode
LED ' and the second button S1 ', also includes：Second voltage clamp circuit module 10, the second current comparator 20, the second controlling switch
S2 ' and second switch M1 '.
A second switch M1 ' termination power BAT, the other end and the second controlling switch S2 ' first end be connected, second control
Second end of switch S2 ' is connected with the input of second voltage clamp circuit module 10, second voltage clamp circuit module 10
Output head grounding GND；
Second switch M1 ' is circumscribed with pulse width modulating signal PWM.
Second controlling switch S2 ' first termination the second current comparator 20 positive input terminal, the second current comparator 20
Negative input end connect default reference current signal.
Second controlling switch S2 ' first end as second pin KEY ' and the second LED ' positive pole connect
Connect.The first termination power BAT of the second button S1 ', the second end and the second LED ' positive pole be connected, second light
Diode (LED) ' minus earth.
Below the operation principle of the power pins multiplex circuit of the embodiment of the present application is illustrated：
When the power pins multiplex circuit of the application works, when the pulse width modulating signal PWM of input is low level,
Second controlling switch S2 ' closure, the first LED ' do not work.Now, press second pin KEY '（S1 ' is closed）, it is interior
The second voltage clamp circuit module 10 in portion, will limit BAT to second pin KEY ' cross-pressure（VBAT_KEY）So that VBAT_
KEY be less than the second LED ' conduction voltage drop.The electricity of the second LED ' be not turned on, second pin KEY '
Flow from internal second voltage clamp circuit module 10 and flow through.Internal current sample circuit detects second voltage clamp circuit mould
The electric current that block 10 flows out, is sent in the second current comparator 20, is compared with default reference current signal.When electric current is more than default
Reference current signal when, be judged as second pin KEY ' be pressed, the second current comparator 20 output KEY_S signals, you can
Learn that the second button S1 ' is pressed.
When input has pulse width modulating signal pwm signal, the second LED ' turn on it is shinny.Now, flow
Cross the second LED ' electric current also for high frequency PWM electric currents, as frequency is higher, human eye is judged as Chang Liang.In PWM
Signal be high level when, second switch M1 ' conducting, the second controlling switch S2 ' disconnect, electric current from BAT flow through the 3rd R1 ', second
LED ' and second switch M1 ' to GND.When PWM is low level, the second LED ' no current stream
Cross.Under the conditions of this, pwm signal be low level time section, the second controlling switch S2 ' closure, detection second pin KEY electricity
Stream, when the electric current for detecting is more than default reference current signal, is judged as second pin KEY ' press, and send KEY_S
Signal.
Preferably, the embodiment of the present application provides a kind of power pins multiplex circuit, and second switch M1 ' is switched for the 2nd mos,
That is second switch M1 ', can specifically be included as switch using mos pipes：
Second LED ' and the second button S1 ', need to use two pins in chip in traditional circuit
Go to control respectively.Power pins multiplex circuit in application scheme only uses second pin KEY '.Fig. 3 B are referred to,
Structural representations of Fig. 3 B for the power pins multiplex circuit of the embodiment of the present application two, as shown in Figure 3 B, the power supply of the application draws
Foot multiplex circuit also includes：Second voltage clamp circuit module 10, the second current comparator 20, the second controlling switch S2 ' and
2nd mos switchs M1 '.
2nd mos switch M1 ' drain D connect power supply, source S and the second controlling switch S2 ' first end be connected, second control
Second end of system switch S2 ' is connected with the input of second voltage clamp circuit module 10, second voltage clamp circuit module 10
Output head grounding GND.
The grid G of the 2nd mos switch M1 ' is circumscribed with pulse width modulating signal PWM.
Second controlling switch S2 ' first termination the second current comparator 20 positive input terminal, the second current comparator 20
Negative input end connect default reference current signal.
The positive pole of the second controlling switch S2 ' first end as pin KEY ' and the second LED ' ' is connected.The
The first termination power BAT of two button S1 ', the second end and the second LED ' ' positive pole be connected, the second optical diode
The minus earth GND of LED '.
In a kind of embodiment, the second LED ' with 3rd resistor R1 ' is connected in series.Series connection 3rd resistor R1 '
During ' electric current, it is ensured that electric current flows through the second LED ' the place branch road that can limit the second LED, electricity
The stability on road.
In a kind of embodiment, the second button S1 ' and the 4th resistance R2 ' is connected in series.The 4th resistance R2 ' that connects can be limited
The electric current of the second button S1 ' is flow through, the stability of circuit is lifted.
As can be seen that the second LED ' and the second button S1 ' be serially connected in power supply BAT and ground GND between.Second
Pin KEY ' is connected on the second LED ' and the second button S1 ' between.The application only needs to second pin KEY '
I.e. be capable of achieving the second LED ' and the second button S1 ' control.
When the power pins multiplex circuit of the application works, when the pulse width modulating signal PWM of input is low level,
Second controlling switch S2 ' closure, the first LED ' do not work.
Now, press second pin KEY '（S1 ' is closed）, internal second voltage clamp circuit module 10 will limit BAT
To second pin KEY ' cross-pressure（VBAT_KEY）So that VBAT_KEY be less than the second LED ' conduction voltage drop.
The electric current of the second LED ' be not turned on, second pin KEY ' is flowed from internal second voltage clamp circuit module 10
Cross.Internal current sample circuit detects the electric current of the outflow of second voltage clamp circuit module 10, sends into the second current comparator
In 20, compare with default reference current signal.When electric current is more than default reference current signal, it is judged as second pin
KEY ' is pressed, the output KEY_S signals of the second current comparator 20, you can learn that the second button S1 ' is pressed.
When input has pulse width modulating signal pwm signal, the second LED ' turn on it is shinny.
Now, flow through the second LED ' electric current also for high frequency PWM electric currents, due to frequency it is higher, human eye
It is judged as Chang Liang.Pwm signal be high level when, the 2nd mos switch M1 ' conducting, the second controlling switch S2 ' disconnect, electric current from
BAT flows through the 3rd R1 ', the second LED ' and the 2nd mos switch M1 ' to GND.When PWM is low level, second
Optical diode LED ' no currents flow through.Under the conditions of this, pwm signal be low level time section, the second controlling switch S2 ' close
Close, detect second pin KEY electric current, when the electric current for detecting is more than default reference current signal, be judged as second pin
KEY ' is pressed, and sends KEY_S signals.
Above content is the further description made to the application with reference to specific embodiment, it is impossible to assert this Shen
Being embodied as please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of conceiving from the application, some simple deduction or replace can also be made.
Claims (8)
1. a kind of power pins multiplex circuit, including：First LED and the first button S1, it is characterised in that also wrap
Include：First voltage clamp circuit module, the first current comparator, the first controlling switch S2 and first switch M1；
The input termination power of the first voltage clamp circuit module, the first end of outfan and first controlling switch S2
Connection, the second end of first controlling switch S2 are connected with first switch M1, the first switch M1 other end ground connection,
The external pulse width modulating signal of first switch M1；
Second end of first controlling switch S2 is connected with the positive input terminal of first current comparator, first electric current
The negative input end of comparator connects default reference current signal；
Second end of first controlling switch S2 is connected with the first LED negative pole of outside as the first pin KEY
Connect, first LED and the first button S1 are grounded after being connected in series, and first LED is just
Pole is connected with power supply.
2. power pins multiplex circuit as claimed in claim 1, it is characterised in that first switch M1 is mos switches；
The drain electrode that second end of first controlling switch S2 is switched with a mos is connected, the source of the mos switches
Pole is grounded, the external pulse width modulating signal of grid.
3. power pins multiplex circuit as claimed in claim 1 or 2, it is characterised in that
First LED is connected in series with first resistor R1.
4. power pins multiplex circuit as claimed in claim 3, it is characterised in that
The first button S1 is connected in series with second resistance R2.
5. a kind of power pins multiplex circuit, including：Second LED ' and the second button S1 ', it is characterised in that also
Including：Second voltage clamp circuit module, the second current comparator, the second controlling switch S2 ' and second switch M1 '；
A second switch M1 ' termination powers, the other end and second controlling switch S2 ' first end be connected, described
Two controlling switches S2 ' the second end be connected with the input of the second voltage clamp circuit module, the second voltage clamper
The output head grounding of circuit module；
The second switch M1 ' is circumscribed with pulse width modulating signal；
Second controlling switch S2 ' the first termination second current comparator positive input terminal, the second electric current ratio
Connect default reference current signal compared with the negative input end of device；
Second controlling switch S2 ' first end as second pin KEY ' and second LED ' positive pole
Connection；The first termination power BAT of the second button S1 ', the second end and second LED ' positive pole connect
Connect, second LED ' minus earth.
6. power pins multiplex circuit as claimed in claim 5, it is characterised in that
The second switch M1 ' is switched for the 2nd mos；
The grid of the 2nd mos switches M1 ' is circumscribed with pulse width modulating signal, and the drain electrode of the 2nd mos switches M1 ' connects
Power supply, source electrode and second controlling switch S2 ' first end be connected.
7. the power pins multiplex circuit as described in claim 5 or 6, it is characterised in that
Second LED ' it is connected in series 3rd resistor R1 '.
8. power pins multiplex circuit as claimed in claim 7, it is characterised in that
The second button S1 ' is connected in series in the 4th resistance R2 '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621076266.5U CN206117629U (en) | 2016-09-23 | 2016-09-23 | Power pin multiplex circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621076266.5U CN206117629U (en) | 2016-09-23 | 2016-09-23 | Power pin multiplex circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206117629U true CN206117629U (en) | 2017-04-19 |
Family
ID=58521661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621076266.5U Active CN206117629U (en) | 2016-09-23 | 2016-09-23 | Power pin multiplex circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206117629U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111225472A (en) * | 2020-01-20 | 2020-06-02 | 珠海智融科技有限公司 | Temperature detection and LED drive pin multiplexing circuit, power supply chip and working method of pin multiplexing circuit |
-
2016
- 2016-09-23 CN CN201621076266.5U patent/CN206117629U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111225472A (en) * | 2020-01-20 | 2020-06-02 | 珠海智融科技有限公司 | Temperature detection and LED drive pin multiplexing circuit, power supply chip and working method of pin multiplexing circuit |
| CN111225472B (en) * | 2020-01-20 | 2021-01-05 | 珠海智融科技有限公司 | Temperature detection and LED drive pin multiplexing circuit, power supply chip and working method of pin multiplexing circuit |
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