JP2017161505A - Magnetic sensor and magnetic sensor device - Google Patents

Magnetic sensor and magnetic sensor device Download PDF

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JP2017161505A
JP2017161505A JP2017006526A JP2017006526A JP2017161505A JP 2017161505 A JP2017161505 A JP 2017161505A JP 2017006526 A JP2017006526 A JP 2017006526A JP 2017006526 A JP2017006526 A JP 2017006526A JP 2017161505 A JP2017161505 A JP 2017161505A
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magnetic sensor
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circuit
output
resistor
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JP6797035B2 (en
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健太郎 深井
Kentaro Fukai
健太郎 深井
稔 有山
Minoru Ariyama
稔 有山
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Ablic Inc
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Priority to TW106107312A priority patent/TWI722128B/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
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Abstract

PROBLEM TO BE SOLVED: To provide a magnetic sensor and a magnetic sensor device which can accurately determine such abnormalities as disconnection or short-circuit of wirings of the magnetic sensor device.SOLUTION: The output control circuit of the magnetic sensor includes: a partial pressure circuit connected to an output terminal; and an amplifier for controlling the gate voltage of a MOS transistor connected to the output terminal of the magnetic sensor so that the voltage of the partial pressure circuit and the voltage of the reference voltage become equal. With the configuration, the output voltage of the magnetic sensor is determined by the ratio of the reference voltage and the partial pressure of the partial pressure circuit.SELECTED DRAWING: Figure 1

Description

本発明は、磁気センサに関し、より詳しくは出力端子を外部でプルアップする構成の磁気センサ及び磁気センサ装置に関する。   The present invention relates to a magnetic sensor, and more particularly to a magnetic sensor and a magnetic sensor device configured to pull up an output terminal externally.

磁気センサ装置は、磁束密度を電気信号に変換する磁気検出素子を備え、磁性体が設けられた被検出部材との相対距離の変化に応じて変化する磁束密度が予め設定された磁束密度閾値との大小を電気的に判定し、２レベルの電圧の検出信号を出力する。磁気センサを用いるスイッチングシステム、特に自動車の分野においては、自動車の利用者に安全を提供するため、機能安全（ＩＳＯ２６２６２）の観点からシステムを構築することが要求される。例えば、磁気センサ素子自体の故障や、システム内の信号伝達経路の故障により、誤ったスイッチング動作が行われてしまう懸念を払拭させることが要求される。   The magnetic sensor device includes a magnetic detection element that converts the magnetic flux density into an electric signal, and a magnetic flux density that changes according to a change in a relative distance from a detected member provided with a magnetic body is a preset magnetic flux density threshold value. Is electrically determined, and a detection signal of a two-level voltage is output. In the field of switching systems using magnetic sensors, particularly in the field of automobiles, it is required to construct a system from the viewpoint of functional safety (ISO 26262) in order to provide safety to automobile users. For example, it is required to eliminate the concern that an erroneous switching operation is performed due to a failure of the magnetic sensor element itself or a signal transmission path in the system.

図４は、従来の磁気センサ装置である。磁気センサ５０は、磁気センサを含む信号処理回路５１と、トランジスタ５２と、定電流回路５３と、抵抗５４で構成される。判別回路５９は、磁気センサ５０とＧＮＤが共通に接続され、端子ＩＮが磁気センサ５０の端子ＯＵＴと接続されている。更に、磁気センサ５０の端子ＩＮは、プルアップ抵抗５８によって電圧ＶＤＤにプルアップされている。   FIG. 4 shows a conventional magnetic sensor device. The magnetic sensor 50 includes a signal processing circuit 51 including a magnetic sensor, a transistor 52, a constant current circuit 53, and a resistor 54. In the determination circuit 59, the magnetic sensor 50 and GND are connected in common, and the terminal IN is connected to the terminal OUT of the magnetic sensor 50. Further, the terminal IN of the magnetic sensor 50 is pulled up to the voltage VDD by the pull-up resistor 58.

磁気センサ５０は、電圧ＶＤＤより所定値だけ低い高レベル値と電圧ＧＮＤより所定値だけ高い低レベル値の２値を端子ＯＵＴに出力する。判別回路５９は、入力電圧レベルがそれら２値の近傍以外の電圧である場合に異常と判定する異常検出機能を有する。   The magnetic sensor 50 outputs two values, a high level value lower than the voltage VDD by a predetermined value and a low level value higher than the voltage GND by a predetermined value to the terminal OUT. The determination circuit 59 has an abnormality detection function for determining an abnormality when the input voltage level is a voltage other than the vicinity of these binary values.

このように電圧ＶＤＤや電圧ＧＮＤと等価でない所定の電圧レベルを正常と判断するよう構成することで、入力端子の断線など異常を容易に検出する事が出来る。例えば、磁気センサ５０の端子ＯＵＴと判別回路５９の端子ＩＮの間の配線が断線しオープンになった場合は、判別回路５９の入力レベルが電圧ＶＤＤとなるため異常と判定される。また、磁気センサ５０の端子ＯＵＴと判別回路５９の端子ＩＮの間の配線が電圧ＧＮＤに短絡した場合は、判別回路５９の入力レベルが電圧ＧＮＤとなるため異常と判定される。   In this way, by configuring the predetermined voltage level that is not equivalent to the voltage VDD or the voltage GND as normal, it is possible to easily detect abnormality such as disconnection of the input terminal. For example, when the wiring between the terminal OUT of the magnetic sensor 50 and the terminal IN of the determination circuit 59 is disconnected and opened, it is determined that the input level of the determination circuit 59 is the voltage VDD, which is abnormal. When the wiring between the terminal OUT of the magnetic sensor 50 and the terminal IN of the determination circuit 59 is short-circuited to the voltage GND, the input level of the determination circuit 59 becomes the voltage GND, so that it is determined as abnormal.

特開２００１−１６５９４４号公報JP 2001-165944 A

上述の回路構成の場合、正常時の判別回路５９の入力電圧レベルは、抵抗５４と定電流回路５３とトランジスタ５２及びプルアップ抵抗５８により決まる。従って、プルアップ抵抗５８は、製造ばらつきにより抵抗値がばらつくため、入力電圧レベルが変動してしまい、判別回路５９が誤判定をしてしまうという課題がある。   In the case of the circuit configuration described above, the input voltage level of the determination circuit 59 in a normal state is determined by the resistor 54, the constant current circuit 53, the transistor 52, and the pull-up resistor 58. Therefore, since the resistance value of the pull-up resistor 58 varies due to manufacturing variations, there is a problem that the input voltage level fluctuates and the determination circuit 59 makes an erroneous determination.

このような課題を解決するため、本発明の磁気センサは、出力制御回路を、出力端子に接続された分圧回路と、分圧回路の電圧と基準電圧が等しくなるように磁気センサの出力端子に接続されたＭＯＳトランジスタのゲート電圧を制御するアンプを備えた。   In order to solve such problems, the magnetic sensor of the present invention includes an output control circuit, a voltage dividing circuit connected to the output terminal, and an output terminal of the magnetic sensor so that the voltage of the voltage dividing circuit is equal to the reference voltage. And an amplifier for controlling the gate voltage of the MOS transistor connected to.

本発明の磁気センサによれば、磁気センサの出力電圧は、基準電圧と分圧回路の分圧比によって決定されるので、プルアップ抵抗の抵抗値ばらつきに左右されないという効果がある。従って、判別回路は磁気センサ装置の配線の断線や短絡などの異常を正確に判定する事が出来る。   According to the magnetic sensor of the present invention, since the output voltage of the magnetic sensor is determined by the voltage dividing ratio of the reference voltage and the voltage dividing circuit, there is an effect that it is not affected by the resistance value variation of the pull-up resistor. Therefore, the determination circuit can accurately determine abnormality such as disconnection or short circuit of the wiring of the magnetic sensor device.

本発明の磁気センサの第一実施形態を示す回路図である。It is a circuit diagram showing a first embodiment of a magnetic sensor of the present invention. 本発明の磁気センサの第二実施形態を示す回路図である。It is a circuit diagram which shows 2nd embodiment of the magnetic sensor of this invention. 本発明の磁気センサの第三実施形態を示す回路図である。It is a circuit diagram which shows 3rd embodiment of the magnetic sensor of this invention. 従来の磁気センサ装置を示す回路図である。It is a circuit diagram which shows the conventional magnetic sensor apparatus.

以下、本発明の実施形態を、図面を参照して説明する。
図１は、本発明の磁気センサの第一実施形態を示す回路図である。
磁気センサ装置は、磁気センサ１と、プルアップ抵抗１８と、判別回路１９で構成される。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a circuit diagram showing a first embodiment of the magnetic sensor of the present invention.
The magnetic sensor device includes a magnetic sensor 1, a pull-up resistor 18, and a determination circuit 19.

第一実施形態の磁気センサ１は、磁気センサ素子３と、磁気判定回路４と、出力制御回路１０で構成される。出力制御回路１０は、ＭＯＳスイッチ５と、出力ドライブ素子６と、アンプ７と、基準電圧回路８と、分圧回路である抵抗Ｒ１、Ｒ２、Ｒ３とで構成される。   The magnetic sensor 1 according to the first embodiment includes a magnetic sensor element 3, a magnetic determination circuit 4, and an output control circuit 10. The output control circuit 10 includes a MOS switch 5, an output drive element 6, an amplifier 7, a reference voltage circuit 8, and resistors R1, R2, and R3 that are voltage dividing circuits.

磁気センサ１は、出力端子ＯＵＴが判別回路１９の入力端子とプルアップ抵抗１８を介して外部電源端子ＶＰＵに接続される。磁気センサ素子３は、入力端子が電源端子ＶＤＤ及びＧＮＤに接続され、出力端子が磁気判定回路４の入力端子に接続される。出力ドライブ素子６は、例えばＮチャネルＭＯＳＦＥＴで構成され、ドレインは出力端子ＯＵＴに接続され、ソースは接地端子ＧＮＤに接続されている。抵抗Ｒ１は、一端が出力端子ＯＵＴに接続され、他端（ノードＮ１）が抵抗Ｒ２の一端に接続されている。抵抗Ｒ２は、他端（ノードＮ２）が抵抗Ｒ３の一端に接続されている。抵抗Ｒ３は、他端が接地端子ＧＮＤに接続されている。アンプ７は、出力端子が出力ドライブ素子６のゲートに接続され、反転入力端子は基準電圧回路８の出力端子に接続され、非反転入力端子はノードＮ１に接続されている。ＭＯＳスイッチ５は、例えばＮチャネルＭＯＳＦＥＴで構成され、ゲートは磁気判定回路４の出力端子に接続され、ドレインはノードＮ２に接続され、ソースは接地端子ＧＮＤに接続される。   The magnetic sensor 1 has an output terminal OUT connected to the external power supply terminal VPU via the input terminal of the determination circuit 19 and the pull-up resistor 18. The magnetic sensor element 3 has an input terminal connected to the power supply terminals VDD and GND, and an output terminal connected to the input terminal of the magnetism determination circuit 4. The output drive element 6 is composed of, for example, an N-channel MOSFET, the drain is connected to the output terminal OUT, and the source is connected to the ground terminal GND. The resistor R1 has one end connected to the output terminal OUT and the other end (node N1) connected to one end of the resistor R2. The other end (node N2) of the resistor R2 is connected to one end of the resistor R3. The other end of the resistor R3 is connected to the ground terminal GND. The amplifier 7 has an output terminal connected to the gate of the output drive element 6, an inverting input terminal connected to the output terminal of the reference voltage circuit 8, and a non-inverting input terminal connected to the node N1. The MOS switch 5 is composed of, for example, an N-channel MOSFET, the gate is connected to the output terminal of the magnetic decision circuit 4, the drain is connected to the node N2, and the source is connected to the ground terminal GND.

判別回路１９は、磁気センサ１が出力する磁束密度に応じた高レベル値と低レベル値を区別する機能に加え、異常検出機能を有する。異常検出機能は、入力される電圧が高レベル値と低レベル値の近傍である場合に磁気センサ装置が正常であると判定し、入力される電圧がそれ以外の電圧領域である場合に磁気センサ装置が異常であると判定する、
磁気センサ素子３は、電圧ＶＤＤを電源とし、磁気センサ素子へ入力される磁束密度に応じた電気信号を出力する。磁気センサ素子３は、例えばホール素子を用いる事ができる。磁気判定回路４は、磁気センサ素子３の出力する電気信号と、予め設定された閾値信号とを比較し、磁気判定結果を電圧ＶＤＤと電圧ＧＮＤの２値電圧で出力制御回路１０に出力する。 The discrimination circuit 19 has an abnormality detection function in addition to a function of distinguishing between a high level value and a low level value corresponding to the magnetic flux density output from the magnetic sensor 1. The abnormality detection function determines that the magnetic sensor device is normal when the input voltage is in the vicinity of the high level value and the low level value, and the magnetic sensor when the input voltage is in the other voltage range. Determine that the device is abnormal,
The magnetic sensor element 3 uses the voltage VDD as a power source and outputs an electrical signal corresponding to the magnetic flux density input to the magnetic sensor element. As the magnetic sensor element 3, for example, a Hall element can be used. The magnetic determination circuit 4 compares the electrical signal output from the magnetic sensor element 3 with a preset threshold signal, and outputs the magnetic determination result to the output control circuit 10 as a binary voltage of the voltage VDD and the voltage GND.

磁気判定回路４の出力が電圧ＧＮＤの場合、ＭＯＳスイッチ５はオフ状態であり、ノードＮ２は抵抗Ｒ３によって接地端子ＧＮＤと接続されている。
一方、磁気判定回路４の出力が電圧ＶＤＤの場合、ＭＯＳスイッチ５はオン状態であり、ノードＮ２は接地端子ＧＮＤと接続されている。 When the output of the magnetic decision circuit 4 is the voltage GND, the MOS switch 5 is in an off state, and the node N2 is connected to the ground terminal GND through the resistor R3.
On the other hand, when the output of the magnetic determination circuit 4 is the voltage VDD, the MOS switch 5 is in the on state, and the node N2 is connected to the ground terminal GND.

出力端子ＯＵＴと接地端子ＧＮＤの間には、分圧回路と電気的に並列に出力ドライブ素子６が接続される。出力ドライブ素子６は、ＮチャネルＭＯＳＦＥＴであり、ゲート電圧を制御することで、出力端子ＯＵＴと接地端子ＧＮＤの間にドレイン電流を流すことができる。また、アンプ７は、ノードＮ１が非反転入力端子に接続され、基準電圧回路８が反転入力端子に接続され、出力端子が出力ドライブ素子６のゲート端子に接続されているため、ノードＮ１の電圧を基準電圧回路８の基準電圧に等しくなるように出力ドライブ素子６を制御する。   Between the output terminal OUT and the ground terminal GND, the output drive element 6 is connected electrically in parallel with the voltage dividing circuit. The output drive element 6 is an N-channel MOSFET, and by controlling the gate voltage, a drain current can flow between the output terminal OUT and the ground terminal GND. In the amplifier 7, the node N1 is connected to the non-inverting input terminal, the reference voltage circuit 8 is connected to the inverting input terminal, and the output terminal is connected to the gate terminal of the output drive element 6. Is controlled to be equal to the reference voltage of the reference voltage circuit 8.

磁気センサ１の出力端子ＯＵＴの出力電圧をＶＯＵＴとし、基準電圧回路８の基準電圧をＶＲＥＦとすると、出力電圧ＶＯＵＴは、磁気判定結果の場合分けにより２つの式で表わされる。
ＶＯＵＴ＝（１＋Ｒ１／Ｒ２）×ＶＲＥＦ ・・・（１）
ＶＯＵＴ＝｛１＋Ｒ１／（Ｒ２＋Ｒ３）｝×ＶＲＥＦ ・・・（２）
式１は、磁気判定回路４の出力が電圧ＶＤＤの場合の出力電圧ＶＯＵＴを表わす。式２は、磁気判定回路４の出力が電圧ＧＮＤの場合の出力電圧ＶＯＵＴを表わす。 Assuming that the output voltage of the output terminal OUT of the magnetic sensor 1 is VOUT and the reference voltage of the reference voltage circuit 8 is VREF, the output voltage VOUT is expressed by two equations depending on the case of the magnetic determination result.
VOUT = (1 + R1 / R2) × VREF (1)
VOUT = {1 + R1 / (R2 + R3)} × VREF (2)
Expression 1 represents the output voltage VOUT when the output of the magnetic determination circuit 4 is the voltage VDD. Expression 2 represents the output voltage VOUT when the output of the magnetic determination circuit 4 is the voltage GND.

このように、磁気センサ１の出力電圧ＶＯＵＴは、プルアップ抵抗１８の抵抗値に依存しないため、プルアップ抵抗１８のばらつきに対して影響を受けることがない。したがってプルアップ抵抗値を柔軟に設定できるため、さらなる効果として、プルアップ抵抗値を大きくすることで磁気センサシステムの省電力化も可能となる。   Thus, since the output voltage VOUT of the magnetic sensor 1 does not depend on the resistance value of the pull-up resistor 18, it is not affected by variations in the pull-up resistor 18. Therefore, since the pull-up resistance value can be set flexibly, as a further effect, it is possible to reduce the power consumption of the magnetic sensor system by increasing the pull-up resistance value.

以下に、第一実施形態の磁気センサを実現する具体的な抵抗値の例を示す。
外部電源ＶＰＵを５．０Ｖ、基準電圧ＶＲＥＦを０．３Ｖとした場合の、式１の出力電圧ＶＯＵＴが４．５Ｖ、式２の出力電圧ＶＯＵＴが０．５Ｖとなるような回路定数を求める。式１および式２から、Ｒ１：Ｒ２：Ｒ３の比率は７：０．５：１０に設定すればよいことがわかる。 Below, the example of the specific resistance value which implement | achieves the magnetic sensor of 1st embodiment is shown.
When the external power supply VPU is 5.0 V and the reference voltage VREF is 0.3 V, circuit constants are obtained such that the output voltage VOUT of Expression 1 is 4.5 V and the output voltage VOUT of Expression 2 is 0.5 V. From Equation 1 and Equation 2, it can be seen that the ratio of R1: R2: R3 may be set to 7: 0.5: 10.

さらに具体的には、プルアップ抵抗１８の抵抗値を限定しないためには、抵抗Ｒ１からＲ３の抵抗値は大きいほど望ましい。ＲＰＵをプルアップ抵抗１８の抵抗値とすると、その許容値は式３より求められる。
ＲＰＵ＞（ＶＰＵ−ＶＯＵＴ（１））／｛ＶＯＵＴ（１）／（Ｒ１＋Ｒ２＋Ｒ３）｝・・・（３）
例えば、Ｒ１＝７００ｋΩ、Ｒ２＝５０ｋΩ、Ｒ３＝１ＭΩとすると、プルアップ抵抗１８の抵抗値ＲＰＵは、１９４ｋΩ未満であれば動作可能となる。
より現実的に出力ドライバ素子のドレイン電流許容範囲を考慮すれば、プルアップ抵抗１８の抵抗値は数十Ω以上であることが望ましい。 More specifically, in order not to limit the resistance value of the pull-up resistor 18, the resistance values of the resistors R1 to R3 are preferably as large as possible. When RPU is the resistance value of the pull-up resistor 18, the allowable value is obtained from Equation 3.
RPU> (VPU−VOUT (1)) / {VOUT (1) / (R1 + R2 + R3)} (3)
For example, if R1 = 700 kΩ, R2 = 50 kΩ, and R3 = 1 MΩ, the pull-up resistor 18 can be operated if the resistance value RPU is less than 194 kΩ.
Considering the drain current allowable range of the output driver element more realistically, it is desirable that the resistance value of the pull-up resistor 18 is several tens of Ω or more.

以上説明したように、第一実施形態の磁気センサ１によれば、判別回路１９の入力電圧が基準電圧と分圧回路の分圧比によって決定されるので、プルアップ抵抗１８の抵抗値ばらつきに左右されずに、配線の断線や短絡などの異常を正確に判定する事が出来る。
なお、判別回路１９の求める入力電圧に応じて、出力電圧ＶＯＵＴを調整できるよう分圧回路の抵抗をトリミング手段可能な構成にしてもよい。 As described above, according to the magnetic sensor 1 of the first embodiment, since the input voltage of the determination circuit 19 is determined by the voltage dividing ratio of the reference voltage and the voltage dividing circuit, it depends on the resistance value variation of the pull-up resistor 18. Instead, it is possible to accurately determine an abnormality such as a disconnection or a short circuit of the wiring.
It should be noted that the resistance of the voltage dividing circuit may be trimmed so that the output voltage VOUT can be adjusted according to the input voltage required by the determination circuit 19.

図２は、本発明の磁気センサの第二実施形態を示す回路図である。
磁気センサ１００は、磁気センサ素子３と、磁気判定回路４と、出力制御回路２０で構成される。出力制御回路２０は、出力ドライブ素子６と、アンプ７と、分圧回路である抵抗Ｒ１、Ｒ２、基準電圧回路８１と、基準電圧回路８２と、ＭＯＳスイッチ９０ととで構成される。 FIG. 2 is a circuit diagram showing a second embodiment of the magnetic sensor of the present invention.
The magnetic sensor 100 includes a magnetic sensor element 3, a magnetic determination circuit 4, and an output control circuit 20. The output control circuit 20 includes an output drive element 6, an amplifier 7, resistors R1 and R2, which are voltage dividing circuits, a reference voltage circuit 81, a reference voltage circuit 82, and a MOS switch 90.

磁気センサ１００と、判別回路１９と、プルアップ抵抗１８は、第一実施形態と同様に接続され、同様の動作をする。さらに、磁気センサ素子３と、磁気判定回路４と、出力ドライブ素子６と、アンプ７は、第一実施形態と同様に接続され、同様の動作をするため、説明を省略する。   The magnetic sensor 100, the determination circuit 19, and the pull-up resistor 18 are connected in the same manner as in the first embodiment and perform the same operation. Furthermore, since the magnetic sensor element 3, the magnetic determination circuit 4, the output drive element 6, and the amplifier 7 are connected in the same manner as in the first embodiment and operate in the same manner, description thereof is omitted.

ＭＯＳスイッチ９０は、例えばＣＭＯＳトランジスタで構成され、基準電圧回路８１あるいは基準電圧回路８２を択一的に選択してアンプ７の反転入力端子に接続する。ＭＯＳスイッチ９０は、制御端子を備え、制御端子には磁気判定回路４の出力する２値電圧が入力される。   The MOS switch 90 is composed of, for example, a CMOS transistor, and alternatively selects the reference voltage circuit 81 or the reference voltage circuit 82 and connects it to the inverting input terminal of the amplifier 7. The MOS switch 90 includes a control terminal, and a binary voltage output from the magnetic determination circuit 4 is input to the control terminal.

磁気判定回路４の出力が電圧ＧＮＤの場合、ＭＯＳスイッチ９０は基準電圧回路８１を選択し、基準電圧回路８１の出力端子をアンプ７の反転入力端子に接続する。
一方、磁気判定回路４の出力が電圧ＶＤＤの場合、ＭＯＳスイッチ９０は基準電圧回路８２を選択し、基準電圧回路８２の出力端子をアンプ７の反転入力端子に接続する。 When the output of the magnetic determination circuit 4 is the voltage GND, the MOS switch 90 selects the reference voltage circuit 81 and connects the output terminal of the reference voltage circuit 81 to the inverting input terminal of the amplifier 7.
On the other hand, when the output of the magnetic decision circuit 4 is the voltage VDD, the MOS switch 90 selects the reference voltage circuit 82 and connects the output terminal of the reference voltage circuit 82 to the inverting input terminal of the amplifier 7.

基準電圧回路８１が生成する基準電圧をＶＲＥＦ１とし、基準電圧回路８２が生成する基準電圧をＶＲＥＦ２とする。基準電圧ＶＲＥＦ１と基準電圧ＶＲＥＦ２は、互いに値が異なる基準電圧である。   The reference voltage generated by the reference voltage circuit 81 is VREF1, and the reference voltage generated by the reference voltage circuit 82 is VREF2. The reference voltage VREF1 and the reference voltage VREF2 are reference voltages having different values.

磁気センサ１００の出力端子ＯＵＴの出力電圧をＶＯＵＴとすると、出力電圧ＶＯＵＴは、磁気判定結果の場合分けにより２つの式で表わされる。
ＶＯＵＴ＝（１＋Ｒ１／Ｒ２）×ＶＲＥＦ１・・・（４）
ＶＯＵＴ＝（１＋Ｒ１／Ｒ２）×ＶＲＥＦ２・・・（５）
式４は、磁気判定回路４の出力が電圧ＧＮＤの場合の出力電圧ＶＯＵＴを表わす。式５は磁気判定回路４の出力が電圧ＶＤＤの場合の出力電圧ＶＯＵＴを表わす。 Assuming that the output voltage of the output terminal OUT of the magnetic sensor 100 is VOUT, the output voltage VOUT is expressed by two equations depending on the case of the magnetic determination result.
VOUT = (1 + R1 / R2) × VREF1 (4)
VOUT = (1 + R1 / R2) × VREF2 (5)
Expression 4 represents the output voltage VOUT when the output of the magnetic determination circuit 4 is the voltage GND. Equation 5 represents the output voltage VOUT when the output of the magnetic decision circuit 4 is the voltage VDD.

以下に第二実施形態の磁気センサを実現する具体的な数値例を示す。
外部電源ＶＰＵを５．０Ｖとし、式４の出力電圧ＶＯＵＴが４．５Ｖ、式５の出力電圧ＶＯＵＴが０．５Ｖとなるような回路定数を求める。基準電圧ＶＲＥＦ１が３．０Ｖとなるように基準電圧回路８１を設定する場合、式４より、Ｒ１：Ｒ２の比率は０．５：１に設定すれば良いことがわかる。また、基準電圧ＶＲＥＦ２は、式４および式５から、０．３３Ｖに設定すればよいことがわかる。 Specific numerical examples for realizing the magnetic sensor of the second embodiment are shown below.
The circuit constants are determined so that the external power supply VPU is 5.0 V, the output voltage VOUT of Expression 4 is 4.5 V, and the output voltage VOUT of Expression 5 is 0.5 V. When the reference voltage circuit 81 is set so that the reference voltage VREF1 is 3.0 V, it can be seen from Equation 4 that the ratio of R1: R2 should be set to 0.5: 1. Further, it can be seen from the equations 4 and 5 that the reference voltage VREF2 may be set to 0.33V.

図３は、本発明の磁気センサの第三実施形態を示す回路図である。
基準電圧回路は、第二実施形態と異なり、抵抗９１と抵抗９２と抵抗９３で構成される。また磁気センサ２００は、外部電源ＶＰＵが接続されるＶＤＤ２端子を備え、ＶＤＤ２端子は抵抗９３の一端とアンプ７の反転入力端子に接続される。抵抗９３は、ＭＯＳスイッチ９０によって抵抗９１と抵抗９２のいずれかに接続される。そして、それらの抵抗は、電圧ＶＰＵを抵抗分圧することで基準電圧が得られる。 FIG. 3 is a circuit diagram showing a third embodiment of the magnetic sensor of the present invention.
Unlike the second embodiment, the reference voltage circuit includes a resistor 91, a resistor 92, and a resistor 93. The magnetic sensor 200 includes a VDD2 terminal to which the external power supply VPU is connected. The VDD2 terminal is connected to one end of the resistor 93 and the inverting input terminal of the amplifier 7. The resistor 93 is connected to either the resistor 91 or the resistor 92 by the MOS switch 90. These resistors can obtain a reference voltage by dividing the voltage VPU.

磁気判定回路４の出力が電圧ＶＤＤの場合、ＭＯＳスイッチ９０は抵抗９１を選択して抵抗９３と直列接続する。磁気判定回路４の出力が電圧ＧＮＤの場合、ＭＯＳスイッチ９０は抵抗９２を選択して抵抗９３と直列接続する。   When the output of the magnetic determination circuit 4 is the voltage VDD, the MOS switch 90 selects the resistor 91 and connects it in series with the resistor 93. When the output of the magnetic determination circuit 4 is the voltage GND, the MOS switch 90 selects the resistor 92 and connects it in series with the resistor 93.

外部電源ＶＰＵと抵抗９３と抵抗９１とで生成される基準電圧をＶＲＥＦ１とし、外部電源ＶＰＵと抵抗９３と抵抗９２とで生成される基準電圧をＶＲＥＦ２とする。基準電圧ＶＲＥＦ１と基準電圧ＶＲＥＦ２は、互いに値が異なる基準電圧である。
磁気センサ２００の出力端子ＯＵＴの出力電圧をＶＯＵＴとすると、出力電圧ＶＯＵＴは第二実施形態の磁気センサと同様に式４と式５で表される。 A reference voltage generated by the external power source VPU, the resistor 93, and the resistor 91 is VREF1, and a reference voltage generated by the external power source VPU, the resistor 93, and the resistor 92 is VREF2. The reference voltage VREF1 and the reference voltage VREF2 are reference voltages having different values.
Assuming that the output voltage of the output terminal OUT of the magnetic sensor 200 is VOUT, the output voltage VOUT is expressed by Expression 4 and Expression 5 similarly to the magnetic sensor of the second embodiment.

以下に第三実施形態の磁気センサを実現する具体的な数値例を示す。
外部電源ＶＰＵを５．０Ｖとし、式４の出力電圧ＶＯＵＴが４．５Ｖ、式５の出力電圧ＶＯＵＴが０．５Ｖとなるような回路定数を求める。式４の出力電圧ＶＯＵＴと式５の出力電圧ＶＯＵＴの比は、９：１であるから、基準電圧ＶＲＥＦ１と基準電圧ＶＲＥＦ２の比も９：１となるように設定する。基準電圧ＶＲＥＦ１が３．０Ｖ、基準電圧ＶＲＥＦ２が０．３３Ｖとすると、式４よりＲ１：Ｒ２の比率は０．５：１に設定すれば良いことがわかる。さらに、抵抗９１と抵抗９２と抵抗９３は、抵抗９１が３００ｋΩ、抵抗９２が１４ｋΩ、抵抗９３が２００ｋΩとすることで第三実施形態を実現することができる。 Specific numerical examples for realizing the magnetic sensor of the third embodiment will be shown below.
The circuit constants are determined so that the external power supply VPU is 5.0 V, the output voltage VOUT of Expression 4 is 4.5 V, and the output voltage VOUT of Expression 5 is 0.5 V. Since the ratio between the output voltage VOUT in Expression 4 and the output voltage VOUT in Expression 5 is 9: 1, the ratio between the reference voltage VREF1 and the reference voltage VREF2 is also set to 9: 1. Assuming that the reference voltage VREF1 is 3.0V and the reference voltage VREF2 is 0.33V, it can be seen from Equation 4 that the ratio of R1: R2 should be set to 0.5: 1. Further, the resistor 91, the resistor 92, and the resistor 93 can realize the third embodiment by setting the resistor 91 to 300 kΩ, the resistor 92 to 14 kΩ, and the resistor 93 to 200 kΩ.

以上説明したように、本発明の磁気センサによれば、判別回路１９の入力電圧が基準電圧と分圧回路の分圧比によって決定されるので、プルアップ抵抗１８の抵抗値ばらつきに左右されずに、配線の断線や短絡などの異常を正確に判定する事が出来る。   As described above, according to the magnetic sensor of the present invention, the input voltage of the discriminating circuit 19 is determined by the voltage dividing ratio of the reference voltage and the voltage dividing circuit, so that it is not affected by the resistance value variation of the pull-up resistor 18. It is possible to accurately determine abnormalities such as wire breakage and short circuit.

１、１００、２００ 磁気センサ
３ 磁気センサ素子
４ 磁気判定回路
５、９０ ＭＯＳスイッチ
６ 出力ドライブ素子
７ アンプ
８、８１、８２ 基準電圧回路
１９ 判別回路 DESCRIPTION OF SYMBOLS 1,100,200 Magnetic sensor 3 Magnetic sensor element 4 Magnetic judgment circuit 5, 90 MOS switch 6 Output drive element 7 Amplifier 8, 81, 82 Reference voltage circuit 19 Discrimination circuit

Claims (3)

判別回路の入力端子に接続される出力端子がプルアップ抵抗で外部電源端子と接続された磁気センサであって、
前記磁気センサは、磁気センサ素子と、前記磁気センサ素子の出力電圧が入力される判定回路と、前記判定回路の信号を前記磁気センサの出力端子に出力する出力制御回路と、を備え、
前記出力制御回路は、
前記磁気センサの出力端子と接地端子の間に直列接続された第１、第２、第３の抵抗と、
ゲートが前記判定回路の出力端子に接続され、ドレインが前記第２の抵抗と前記第３の抵抗の接点に接続され、ソースが接地端子に接続された第１のＭＯＳトランジスタと、
反転入力端子が基準電圧回路の出力端子に接続され、非反転入力端子が前記第１の抵抗と前記第２の抵抗の接点に接続されたアンプと、
ゲートが接続され前記アンプの出力端子に接続され、ドレインが前記磁気センサの出力端子に接続され、ソースは接地端子に接続された第２のＭＯＳトランジスタと、
を備えたことを特徴とする磁気センサ。 An output terminal connected to the input terminal of the discrimination circuit is a magnetic sensor connected to an external power supply terminal with a pull-up resistor,
The magnetic sensor includes a magnetic sensor element, a determination circuit to which an output voltage of the magnetic sensor element is input, and an output control circuit that outputs a signal of the determination circuit to an output terminal of the magnetic sensor,
The output control circuit includes:
First, second, and third resistors connected in series between an output terminal and a ground terminal of the magnetic sensor;
A first MOS transistor having a gate connected to the output terminal of the determination circuit, a drain connected to a contact point of the second resistor and the third resistor, and a source connected to a ground terminal;
An amplifier having an inverting input terminal connected to an output terminal of a reference voltage circuit and a non-inverting input terminal connected to a contact point of the first resistor and the second resistor;
A second MOS transistor having a gate connected to the output terminal of the amplifier, a drain connected to the output terminal of the magnetic sensor, and a source connected to the ground terminal;
A magnetic sensor comprising: 判別回路の入力端子に接続される出力端子がプルアップ抵抗で外部電源端子と接続された磁気センサであって、
前記磁気センサは、磁気センサ素子と、前記磁気センサ素子の出力電圧が入力される判定回路と、前記判定回路の信号を前記磁気センサの出力端子に出力する出力制御回路と、を備え、
前記出力制御回路は、
前記磁気センサの出力端子と接地端子の間に直列接続された第１、第２の抵抗と、
制御端子が前記判定回路の出力端子に接続され、第一入力端子が第一基準電圧回路に接続され、第二入力端子が第二基準電圧回路に接続され、出力端子が前記アンプの反転入力端子に接続されたスイッチと、
非反転入力端子が前記第１の抵抗と前記第２の抵抗の接点に接続されたアンプと、
前記アンプの出力端子がゲートに接続され、ドレインが前記磁気センサの出力端子に接続され、ソースが接地端子に接続されたＭＯＳトランジスタと、
を備えたことを特徴とする磁気センサ。 An output terminal connected to the input terminal of the discrimination circuit is a magnetic sensor connected to an external power supply terminal with a pull-up resistor,
The magnetic sensor includes a magnetic sensor element, a determination circuit to which an output voltage of the magnetic sensor element is input, and an output control circuit that outputs a signal of the determination circuit to an output terminal of the magnetic sensor,
The output control circuit includes:
First and second resistors connected in series between an output terminal and a ground terminal of the magnetic sensor;
The control terminal is connected to the output terminal of the determination circuit, the first input terminal is connected to the first reference voltage circuit, the second input terminal is connected to the second reference voltage circuit, and the output terminal is the inverting input terminal of the amplifier. A switch connected to
An amplifier having a non-inverting input terminal connected to a contact point of the first resistor and the second resistor;
An output terminal of the amplifier is connected to the gate, a drain is connected to the output terminal of the magnetic sensor, and a source is connected to the ground terminal; a MOS transistor;
A magnetic sensor comprising: 請求項１または２に記載の磁気センサと、
入力端子に前記磁気センサの出力端子が接続される判別回路と、
前記磁気センサの出力端子と外部電源端子の間に接続されるプルアップ抵抗と、
備えたことを特徴とする磁気センサ装置。 A magnetic sensor according to claim 1 or 2,
A discrimination circuit in which an output terminal of the magnetic sensor is connected to an input terminal;
A pull-up resistor connected between the output terminal of the magnetic sensor and an external power supply terminal;
A magnetic sensor device comprising:
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