JP2006049669A - Hole sensor equipped with level shift circuit - Google Patents

Hole sensor equipped with level shift circuit Download PDF

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JP2006049669A
JP2006049669A JP2004230287A JP2004230287A JP2006049669A JP 2006049669 A JP2006049669 A JP 2006049669A JP 2004230287 A JP2004230287 A JP 2004230287A JP 2004230287 A JP2004230287 A JP 2004230287A JP 2006049669 A JP2006049669 A JP 2006049669A
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output
voltage
driver
hall sensor
microcomputer
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JP4477448B2 (en
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Koichi Sakai
弘一 酒井
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Toko Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hole sensor equipped with a circuit for changing output voltage so as to take interface directly with a microcomputer for processing its signal regarding the output of a hole IC. <P>SOLUTION: The hole sensor for detecting the change of a magnetic field by a hole element and amplifying the detection signal to obtain output is provided with a comparator C for controlling the operation of the driver D of the hole sensor. By controlling the normal rotation input terminal voltage of the comparator to be a prescribed value, output in the case of operation of a driver is controlled to be not higher than a prescribed voltage to be lowered to the operation voltage of the microcomputer processing the output signal. When a circuit for changing the output voltage is provided, a level shifter is incorporated inside of the IC of the hole sensor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、直接ホールICとマイコンとのインターフェースを取ることのできるレベルシフト回路を具えたホールセンサに関するものである。   The present invention relates to a Hall sensor having a level shift circuit that can directly interface with a Hall IC and a microcomputer.

磁気センサの一種としてホール素子が各方面で用いられている。これは微小な磁気の変化を検出してその信号を増幅し、マイコンで処理して所期のセンサ出力を得るものである。ホール素子は一般に3.0Vで動作されるが、マイコンの方は動作電圧が下がっており、1.8V動作のものが使用されている(図4参照)。この電圧の差を調整するレベルシフターがないと、マイコンに過大な電圧がかかり、ラッチアップを起こして破壊してしまうことがある。そこで、ホールICのドライブ回路に出力用別電源端子を作って出力信号の代々電圧を下げたり(図5はレベルシフト用ICを介在させてホールICの出力である3.0Vを、マイコンの動作電圧である1.8Vまで下げたものを示す。)、ホールICそのものの出力を1.8Vにまで下げる必要がある(図6参照)。   Hall elements are used in various directions as a kind of magnetic sensor. In this method, a minute change in magnetism is detected, the signal is amplified, and processed by a microcomputer to obtain a desired sensor output. The Hall element is generally operated at 3.0V, but the operating voltage of the microcomputer is lower, and the one operating at 1.8V is used (see FIG. 4). Without a level shifter that adjusts this voltage difference, an excessive voltage is applied to the microcomputer, causing latch-up and destruction. Therefore, a separate power supply terminal for output is created in the drive circuit of the Hall IC, and the voltage of the output signal is lowered (FIG. 5 shows that the output of the Hall IC is 3.0V by interposing the level shift IC, and the operation of the microcomputer The voltage is lowered to 1.8V, which is the voltage.), And the output of the Hall IC itself needs to be lowered to 1.8V (see FIG. 6).

図6に示したようにホールICそのものを1.8V動作とすることが理想的だが、電源電圧が通常用いられる3.0Vである場合にはレギュレータを用いて電圧を落としている。この場合、レギュレータの効率を考えると図7に示した構成よりも図8に示した構成の方が消費電力が少なく、望ましい。
特開平5−49288号公報
As shown in FIG. 6, it is ideal to operate the Hall IC itself at 1.8V, but when the power supply voltage is 3.0V, which is normally used, the voltage is dropped using a regulator. In this case, considering the efficiency of the regulator, the configuration shown in FIG. 8 is preferable because it consumes less power than the configuration shown in FIG.
JP-A-5-49288

ホールセンサなどによる信号をマイコンで処理する場合、その動作電圧を調整することが必要である。近年、マイコンの動作電圧は下がっており、1.8Vで動作するものがある。ホール素子の動作電圧である3V出力をそのまま1.8Vで動作するマイコンに入力すると、マイコンがラッチアップを起こしてしまう。本発明は、ホールICの出力をその信号を処理するマイコンと直接インターフェースを取ることのできるように出力電圧を変更する回路を具えたホールセンサを提供するものである。
また、その出力電圧を変更する回路を具える場合、ホールセンサのIC内部にレベルシフターを内蔵させてしまうことが望ましい。
When a signal from a hall sensor or the like is processed by a microcomputer, it is necessary to adjust the operating voltage. In recent years, the operating voltage of microcomputers has decreased, and some microcomputers operate at 1.8V. If the 3V output, which is the operating voltage of the Hall element, is directly input to a microcomputer that operates at 1.8V, the microcomputer will cause latch-up. The present invention provides a hall sensor having a circuit for changing the output voltage so that the output of the hall IC can be directly interfaced with a microcomputer for processing the signal.
Further, when a circuit for changing the output voltage is provided, it is desirable to incorporate a level shifter inside the Hall sensor IC.

本発明は、ホールセンサを構成するICにレベルシフト回路を内蔵させることによって、常時の課題を開設するものである。すなわち、磁界の変化をホール素子で検出してその検出信号を増幅して出力を得るホールセンサにおいて、そのホールセンサのドライバの動作を制御するコンパレータを具え、このコンパレータの正転入力端子電圧を所定の値に制御することによってドライバの動作時の出力を所定電圧以下に制御して、その出力信号を処理するマイクロコンピュータの動作電圧まで下げることに特徴を有するものである。   The present invention establishes a constant problem by incorporating a level shift circuit in an IC constituting a Hall sensor. That is, a Hall sensor that detects a change in the magnetic field with a Hall element and amplifies the detection signal to obtain an output includes a comparator that controls the operation of the driver of the Hall sensor. By controlling the output to a value of 1, the output during operation of the driver is controlled to a predetermined voltage or lower, and the output signal is reduced to the operating voltage of the microcomputer that processes the output signal.

本発明によれば、ホールICの出力を、信号を処理するためのマイクロコンピュータの動作電圧に下げることができる。したがって、マイクロコンピュータのラッチアップを防止することができる。また、インバータ構成として、非動作時には出力信号を発生するドライバを対しさせることができるので、消費電流を少なく抑えることができ、センサICに求められる低消費電流に適合したセンサが実現さっる。   According to the present invention, the output of the Hall IC can be lowered to the operating voltage of the microcomputer for processing the signal. Therefore, latch-up of the microcomputer can be prevented. In addition, since the inverter configuration can be matched with a driver that generates an output signal when not in operation, the current consumption can be suppressed to a low level, and a sensor suitable for the low current consumption required for the sensor IC can be realized.

本発明によるレベルシフト回路を具えたホールセンサを図1に示す。ホールIC内に出力の最大電圧になるであろう電圧源Vを用意する。この例では、マイクロコンピュータの動作電圧に合わせ込んだ1.8Vとしてある。この電圧源をコンパレータCの正転入力端子と接続する。これによってコンパレータCの最大出力が設定される。コンパレータCの出力がドライバD1に接続され、入力信号があるときにはそれに応じてオンされる。その動作状態はコンパレータCの反転入力端子にフィードバックされる。   A Hall sensor having a level shift circuit according to the present invention is shown in FIG. A voltage source V that will be the maximum output voltage is prepared in the Hall IC. In this example, the voltage is set to 1.8 V that matches the operating voltage of the microcomputer. This voltage source is connected to the normal rotation input terminal of the comparator C. As a result, the maximum output of the comparator C is set. The output of the comparator C is connected to the driver D1, and when there is an input signal, it is turned on accordingly. The operating state is fed back to the inverting input terminal of the comparator C.

またドライバD2がドライバD1と直列に接続され、これによって上段と下段とで交際されるインバータが得られる。下段のドライバD2がONとなるときには、上段の回路は停止されて低消費電流とすることができる。また、インバータI1を介して抵抗Rが接続され、出力を高速にするとともにオーバーシュートした時にコンパレータが反転してしまって元へ戻らなくならないようにする。   Also, the driver D2 is connected in series with the driver D1, thereby obtaining an inverter that is associated with the upper stage and the lower stage. When the lower driver D2 is turned on, the upper circuit can be stopped to reduce current consumption. In addition, a resistor R is connected via the inverter I1 to increase the output speed and prevent the comparator from inverting and returning to the original state when overshooting occurs.

以下、回路図を参照して、本発明の実施例について説明する。図2は本発明の実施例を示す回路図で、図1に示したブロックを具体的な素子によって構成したものである。FET(M24,M25,M29,M30)で構成されるコンパレータの出力が上部ドライバであるのFET(M26)に接続される。電源(V7)の1.8Vの直流出力がコンパレータに入力され、この電圧が上部ドライバであるFET(M26)の出力の上限を固定することになる。FET(M36a)が消費電流を下げるためのインバータ構成のスイッチング素子で、入力信号がないときに下部ドライバであるFET(M37)を動作させる。また、FET(M25a)は出力スイッチング素子であるFET(M26)をオン−オフせせるものである。   Embodiments of the present invention will be described below with reference to circuit diagrams. FIG. 2 is a circuit diagram showing an embodiment of the present invention, in which the block shown in FIG. 1 is constituted by specific elements. The output of the comparator composed of the FETs (M24, M25, M29, M30) is connected to the FET (M26) which is the upper driver. The 1.8V DC output of the power supply (V7) is input to the comparator, and this voltage fixes the upper limit of the output of the upper driver FET (M26). The FET (M36a) is an inverter-structured switching element for reducing current consumption, and operates the lower driver FET (M37) when there is no input signal. The FET (M25a) turns on and off the FET (M26) which is an output switching element.

抵抗(R15)は、出力を高速にするため、または、オーバーシュートしたときにコンパレータが反転してしまって元に戻らなくなることを防止するすらためのものである。出力に負荷が接続されているときには必要ないが、負荷が大きいと元に戻るのに時間がかかる。この抵抗を接続すれば、最終値が常に出力と同値になるため、無駄な電流が流れない等の利点がある。   The resistor (R15) is for speeding up the output, or even for preventing the comparator from inverting and returning to its original state when overshooting occurs. This is not necessary when a load is connected to the output, but it takes time to return to the original state when the load is large. If this resistor is connected, the final value is always the same value as the output, so there is an advantage that no wasteful current flows.

本発明によるホールセンサの動作タイミングは図3に示したように、3.0Vの入力パルスと1.8Vの出力パルスの間欠的とし、そのタイミングを外部クロックによって制御することができる。上記の上部ドライバにPチャンネルMOS-FETを使用すれば、低電圧まで使用することが可能となり、例えば2.0Vの電源電圧で1.8V出力とすることも可能である。低電圧まで考えないのであればNチャンエルでもよく、より簡単なレベルシフト回路が得られる。   As shown in FIG. 3, the operation timing of the Hall sensor according to the present invention is intermittent between an input pulse of 3.0 V and an output pulse of 1.8 V, and the timing can be controlled by an external clock. If a P-channel MOS-FET is used for the upper driver, it can be used up to a low voltage. For example, a 1.8V output can be obtained with a power supply voltage of 2.0V. If you don't think about low voltage, you can use N channel, and you can get a simpler level shift circuit.

ドライバに接続されるアンプの他に2つのインバータを用いてそのひとつを、上部ドライバがオンとなる状態でないときには消費電流を下げるためのオフさせる作用のために用いる。他のものは、出力の高速動作のために、またはオーバーシュートして出力が目的とする1.8Vに戻ってこないことのないように動作させる。さらに、上部アンプが動作時でない場合に消費電流を下げるために、各部の電流減をカットするスイッチング素子が設けてあり、それらは入力クロックと同期させられる。   In addition to the amplifier connected to the driver, two inverters are used, one of which is used for turning off the current consumption when the upper driver is not turned on. Others are operated for high speed operation of the output or to prevent the output from returning to the intended 1.8V due to overshoot. Furthermore, in order to reduce the current consumption when the upper amplifier is not in operation, switching elements are provided to cut the current reduction of each part, and they are synchronized with the input clock.

本発明は、磁気センサとして使用されるホールセンサに利用でき、センサの出力とその処理回路の最適動作電圧がことなる場合に有利である。   The present invention can be used for a Hall sensor used as a magnetic sensor, and is advantageous when the output of the sensor and the optimum operating voltage of its processing circuit are different.

本発明の実施例を示すブロック図The block diagram which shows the Example of this invention 本発明の実施例を示す回路図Circuit diagram showing an embodiment of the present invention 動作の説明図Explanation of operation 従来のホールセンサを示すブロック図Block diagram showing a conventional Hall sensor 従来のホールセンサを示すブロック図Block diagram showing a conventional Hall sensor 従来のホールセンサを示すブロック図Block diagram showing a conventional Hall sensor 従来のホールセンサを示すブロック図Block diagram showing a conventional Hall sensor 従来のホールセンサを示すブロック図Block diagram showing a conventional Hall sensor

符号の説明Explanation of symbols

C:コンパレータ
D:ドライバ
V:電圧源
I:インバータ
C: Comparator D: Driver V: Voltage source
I: Inverter

Claims (3)

磁界の変化をホール素子で検出してその検出信号を増幅して出力を得るホールセンサにおいて、
そのホールセンサの最大出力電圧をその出力信号を処理するマイクロコンピュータの動作電圧まで下げる回路を具えたことを特徴とするレベルシフト回路を具えたホールセンサ。
In the Hall sensor that detects the change of the magnetic field with the Hall element and amplifies the detection signal to obtain the output,
A hall sensor comprising a level shift circuit comprising a circuit for reducing the maximum output voltage of the hall sensor to an operating voltage of a microcomputer for processing the output signal.
磁界の変化をホール素子で検出してその検出信号を増幅して出力を得るホールセンサにおいて、
そのホールセンサのドライバの動作を制御するコンパレータを具え、このコンパレータの正転入力端子電圧を所定の値に制御することによってドライバの動作時の出力を所定電圧以下に制御して、その出力信号を処理するマイクロコンピュータの動作電圧まで下げることを特徴とするレベルシフト回路を具えたホールセンサ。
In the Hall sensor that detects the change of the magnetic field with the Hall element and amplifies the detection signal to obtain the output,
A comparator for controlling the operation of the Hall sensor driver is provided, and by controlling the normal input terminal voltage of the comparator to a predetermined value, the output during operation of the driver is controlled to a predetermined voltage or less, and the output signal is A hall sensor comprising a level shift circuit characterized by lowering the operating voltage of a microcomputer to be processed.
上記ドライバが2つのドライバからなり、第1のドライバによって出力信号を得るとともに、第2のドライバの動作時には第1のドライバを停止せる請求項2記載のレベルシフト回路を具えたホールセンサ。   3. The hall sensor comprising a level shift circuit according to claim 2, wherein the driver is composed of two drivers, an output signal is obtained by the first driver, and the first driver is stopped during the operation of the second driver.
JP2004230287A 2004-08-06 2004-08-06 Hall sensor with level shift circuit Expired - Fee Related JP4477448B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105022295A (en) * 2015-06-28 2015-11-04 芜湖莫森泰克汽车科技有限公司 Peripheral general circuit of Hall sensors
WO2019063594A1 (en) * 2017-09-29 2019-04-04 Continental Automotive Gmbh Crankshaft, transmission or camshaft sensor, diagnosis system and method implementing such a sensor
FR3071921A1 (en) * 2017-09-29 2019-04-05 Continental Automotive France CRANKSHAFT, TRANSMISSION OR CAMSHAFT SENSOR, SYSTEM AND DIAGNOSTIC METHOD USING SUCH A SENSOR

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105022295A (en) * 2015-06-28 2015-11-04 芜湖莫森泰克汽车科技有限公司 Peripheral general circuit of Hall sensors
WO2019063594A1 (en) * 2017-09-29 2019-04-04 Continental Automotive Gmbh Crankshaft, transmission or camshaft sensor, diagnosis system and method implementing such a sensor
FR3071921A1 (en) * 2017-09-29 2019-04-05 Continental Automotive France CRANKSHAFT, TRANSMISSION OR CAMSHAFT SENSOR, SYSTEM AND DIAGNOSTIC METHOD USING SUCH A SENSOR
FR3072166A1 (en) * 2017-09-29 2019-04-12 Continental Automotive France CRANKSHAFT, TRANSMISSION OR CAMSHAFT SENSOR, SYSTEM AND DIAGNOSTIC METHOD USING SUCH A SENSOR
US11530935B2 (en) 2017-09-29 2022-12-20 Continental Automotive France Crankshaft, transmission or camshaft sensor, diagnosis system and method implementing such a sensor

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