JPS59120833A - Electronic thermometer - Google Patents

Abstract

PURPOSE:To simplify IC designing and to attain to reduce power consumption, by bringing an electronic circuit to LSI constitution by a complementary type element while performing the start and stop of a clock generator in response to the ON/OFF operation of a switch. CONSTITUTION:An electronic circuit which is operated in synchronous relation to the clock signal of a clock generator 4 and displays a temp. value to a display device 3 while subjecting the temp. signal to a temp. sensitive element RX to A/D conversion is brought to LSI constitution by a complementary type element. In addition, a battery E for always supplying electric power to the electronic circuit, a switch SW for applying operation order to the electronic circuit and a binary memory circuit FF5 which substantially performs binary operation in response to the signal of the switch SW and of which the memory content is held by the battery E are provided. An AND circuit 7 outputs the logical product of the output of FF5 and the output from the switch SW and a gate means FF6 controls the start and stop of the generator 4 on the basis of this output state.

Description

[Detailed description of the invention] (a) Technical field The present invention relates to an electronic thermometer such as an electronic thermometer.

(b1 Background of the Invention In general electronic thermometers, etc., the device operates in synchronization with the clock signal from the thermometer, converts the temperature signal from the thermosensor into A/D, and displays the temperature value on the display. A device equipped with an electronic circuit has been put into practical use.In a conventional electric circuit equipped with such an electronic circuit, at a temperature of δ1, switching is performed according to the output state of the switch for giving operation commands to the electronic circuit. ?1 analog switch is converted into an IC bag as part of the electronic circuit. However, since a lot of current flows during operation, the analog switch is
It is necessary to make the C pattern wide and large.
As a result, the space required for integrating the electronic circuit into an IC is reduced, making it difficult to design an IC, and the yield of the IC decreases.

(C1 Purpose of the Invention The purpose of this invention is to reduce the power consumption of electronic circuits,
) l C design? I have an electronic thermometer that can be used easily.

(d1 Structure and results of the invention) This invention concludes that if there is no switching operation, the complementary elements will consume less power ['11-.
.

To summarize, a NOR circuit that displays a temperature value based on the temperature signal of a temperature sensing element (R or C) is constructed using complementary elements. , as well as a battery that constantly supplies power to the NOR circuit, a switch that commands the NOR circuit to operate, and a switch that is included in the electric circuit and responds to the signal from the switch. Target, -binary action (7,
and the contents ↑ and a are held by the battery '11
．． an AND circuit included in the electronic circuit and outputting the logical product of the output of the binary memory circuit and the output point of the switch (C)); It has a gate means that controls the output state of the product circuit (accordingly, starting and stopping the clock generator of the electronic ~F'' circuit), and Q17 when not measuring is the basis of the switching operation. It is characterized by: 1) stopping clock generation;

One advantage of this invention is that the NOR circuit is made 1°Sl with complementary elements, so there is almost no power consumption when there is no switch operation, and the switch is on.

In response to the OFF operation, the 2-teri Tnear device is activated 1.
Since the stop 11 is closed, a large amount of current does not flow during switching operation during non-measurement, and it is possible to use a small IC pattern, which improves IC design.
2.An electronic thermometer that is easy to use and consumes less power (
It has the following advantages.

(8) Embodiment 1 [Concave Ill is a block diagram 2 of the electron temperature δ1 which is an embodiment of the present invention].

Oscillator 1,? -m'! 'i': The circuit 2, the clock oscillator 47, the frequency divider circuit 5, and the switch circuit 6 are connected to the clock 1 word from the clock oscillator 4 + (3, +, synchronously with ff1
Jj (However, an electronic circuit that converts the temperature signal from the thermistor Rx into Δ/D and displays the temperature value on the display 3 is constructed.

The two ends of the Rx are connected to a power supply (not shown), and the oscillator I Lf is connected to the power supply (not shown) through the capacitor C. 3 with an oscillator that oscillates at a frequency approximately determined by the time constant of
-) The output is ii';? It is sent to a counter (not shown) included in times 1 and 2. The capacitor C1 is connected to the discharge capacitor 11 (through resistor R1, impark 11°15 and MO3I-transistor 12. Here, it is assumed that the inverter 15 has hysteresis characteristics2, and the inverter 11 is It is assumed that there is no hysteresis characteristic.Each output of the inverter 15゜11 is connected to a flip-flop FF2 via gate circuits 13-.14.
It can be used as the 7-node input terminal and the reset input terminal. The output of the flip-flop FF20) is applied to the circuits of the arithmetic circuit 2 and the gate of the MOS+ transistor 12. Frisobufu 11 Tsubu FF F 2's C
I-, Terminal Bass Ino Thousand Circuits 6 Furinobufunobu FF
What is the Ω output of 6? I understand.

Arithmetic circuit 1?32 counts the clock signal cLS obtained by dividing the output of the clock oscillator 4 by the frequency dividing circuit 5 with a counter, and passes 1 JTl during the time width of the time signal obtained by the counting. flip flop FF
5. Count the number of pulses from 2 with another counter, and use the counted value to obtain temperature information regarding the temperature measured by Mr. RX in 7.5. The temperature information is output to the indicator 3.

Sui 1000 times l? Reference numeral 36 includes a push button inch SW that commands the operation of this electronic circuit. Flip Flo Knob FF3 D
The input terminal has a power supply voltage VD from the battery IB shown in Figure 2.
D is introduced, and a /J lock signal C1, sh<1, is provided to each CLK terminal of flip-flops FF3 and FF4. The Ω output of flip-flop knob FF "3" is applied to the D input terminal of flip-flop knob FF4.
5 is applied to the C1, , I< input terminal of F5, and the Ω output is applied to the NOR circuit 7. flip flop FF 5
The output lj is applied to the D input terminal of , and its Ω output is applied to the NOR circuit 7. The output terminal of the NOR circuit 7 is connected to the I) input of the floating block FF 6 (J11), and the "Dock signal fc is received from the clock oscillator 5 to the CLK input terminal (J11)". °Press 7
Power supply voltage V D I) at the - end of the button switch/Noah SW
is crossed, and the other end is bent through resistor R2. The CI-7 input terminals of the flip-flops FF3, FF4.6 are connected to the connection point between the push 7 button switch NOAH SW and the resistor R2.

The oscillation start signal of the oscillator 1-1 corresponds to [11 (high) of the σ output of the FF (i).

In the above configuration, the temperature sensing element constituting the present invention is the temperature sensing element Rx, the binary notation 1a circuit is the Frinobuf knob FF5, and the gate means is the flip-flop FF.
6 corresponds to each.

Next, I will explain the operation of the second Denryo Temperature Cry.

FIG. 3 is a timing chart showing the operation of the I switch circuit 6. When you press the 7-button switch SW, it turns on for 1 hour and turns on FF3, 4., 6 at the same time as that input.
will be reset. Immediately after the reset (from the thread, it's free).

Oscillation start signals for the oscillator 1 and the clock generator 15 are output from the output of the block FF 6. In other words, by operating this push button, the power is turned on.
゜Ba "7- In the on state, the arithmetic circuit 2 Ba1 output 1
When the pulse from the FF2 is formed, the clock signal CLS is counted and temperature information is output to the display 3. push button switch S
After 12 hours have passed since turning off W, flip-flops FF4 and FF5 are set to 1- at the falling timing of the black and double signals C1 and S, but the Q output of the free knob flop FF6 becomes low. There is even talent.

After the measurement is completed, press the 7-button switch SW, and at the rising timing of that input, the Frisobufu 11 knob FF
3.4 The beam is set. Then, after the time T3 set for chattering prevention has elapsed since the end of pressing the 7th button SW, the flip 11 knob I? F4
is set, and 2, Flip Flo Knob F F 5
is reset. Therefore, at this time, the output of the flip-flop FF4 and the Q of the flip-flop FF5
Flip 1
The Q output of the single-tube FF6 becomes high, and the d output becomes low, resulting in a power-off state. i.e. Solinobuflo,
The oscillator 1 and the clock oscillator 4 stop oscillating due to the inversion of the output of the FF6.

As mentioned above, it includes a middle push button switch SW,
The switch circuit 6, which has a solid circuit configuration, has an input section F' which can be switched reliably and stably between measurement and non-measurement states. In such a switch input section, the flip-flop FF5 inverts its output in response to the switching operation, and becomes substantially 2.
Performs forward movement. Further, its output state is maintained by battery E via flip-flops FF3 and FF4.

And flip-flop FF6 is flip-flop F
An oscillation start signal is output to the clock oscillator 4 in accordance with the output state of the NOR circuit 7 which outputs the logical product from the F5 output and the 7 button switch SW, and the clock oscillator 4 is activated.
Control the stop. Therefore, clock generation is stopped in the non-measuring state, and almost no power is consumed when the switching W3 operation is not performed. Moreover, since the electronic circuit is constructed of CMO3, power consumption is extremely low. In this way, it is possible to achieve low power consumption, and it is also possible to use a small IC pattern, which greatly simplifies IC design.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an electronic thermometer according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the battery E used in the temperature needle, and Fig. 3 is the operation of the switch circuit 6 of the temperature needle. FIG. ■-Oscillator, 2-Arithmetic circuit, 3--Display device, 4--
--Clock oscillation type, 6-switch circuit. 1:1. i I Taumeiri Tateishi Electric Co., Ltd. Agent Patent Attorney Hisao Komori

Claims (1)

[Claims] (11) The electronic circuit that operates in synchronization with the clock signal from the clock generator and converts the temperature signal from the temperature sensing element into A/I and displays the temperature value on the display is a complementary type element T,
, an S-I electronic thermometer, which includes a battery that constantly supplies power to the electronic circuit, a switch that commands the electronic circuit to operate, and a switch that is included in the electronic circuit and responds to signals from the switch. one binary register circuit which performs substantially binary operation and whose contents are held by the battery, and the binary register ↑ included in the electronic circuit, the output of the nine circuits, and the output of the nine circuits. an AND circuit that outputs an AND with the output from the inch, and gate means included in the electronic circuit that controls starting and stopping of the clock generator in accordance with the output state of the AND circuit; , with U7 electronic thermometer