Programmable switch-type Hall sensor
A Hall sensor and programming switch technology, applied in the field of Hall sensors, can solve problems such as the influence of sensitivity temperature stability, the influence of sensitivity temperature stability, and the limitation of sensitivity adjustment range, so as to achieve convenient operation and management, uniform adjustment step size and , to ensure the effect of temperature stability and consistency
Active Publication Date: 2014-07-16
CROSSCHIP MICROSYST
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Problems solved by technology
If the circuit structure adjusts the sensitivity by adjusting the resistors R7 and R8, the temperature stability of the sensitivity will be greatly affected due to the change of the resistance ratio of the positive and negative temperature coefficient resistors.
If the sensitivity is adjusted through the magnification of the differential op amp, the adjustment step size will be uneven, and due to the checks and balances of the op amp swing, speed and power consumption, the sensitivity adjustment range will be limited
Similarly, if the circuit structure adjusts the threshold voltage selection circuit to realize the type change of the Hall switch, the temperature stability of the sensitivity will also be greatly affected
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[0024] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto. It should be understood that any transformation of technical features and / or the whole but not substantive transformation shall be regarded as the protection scope limited by the present invention.
[0025] A programmable switch type Hall sensor, comprising: a Hall sheet, used to induce a magnetic field signal and convert it into a voltage signal; a threshold voltage generating circuit, used to generate two threshold voltages with the same temperature coefficient as the Hall induced voltage; A reference current generating circuit connected in series with the threshold voltage generating circuit;
[0026] The reference current generation circuit is used to generate a bias current with the same temperature coefficient as the Hall sheet current, which includes a feedback loop forme...
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The invention discloses a programmable switch-type Hall sensor integrated circuit. A resistor R4 and a resistor R5 low in temperature coefficient and a reference current which is the same as a Hall sheet in temperature coefficient are used for generating two threshold value voltages, a digital logic circuit is used for controlling a threshold value voltage selecting module to select the two threshold value voltages and types of the threshold value voltages, then providing one threshold value voltage for a hysteresis comparator as a reference level and comparing the reference level with a Hall signal after amplifying. Because the resistor R4 and the resistor R5 in a threshold value voltage generating circuit are resistors which are the same in type and low in temperature coefficient, the threshold value voltages can be convenient to adjust, and temperature stability and uniformity of sensor flexibility can not be affected. Through modification and adjustment, resistance values of the resistor R4 and the resistor R5 and a threshold value voltage selecting circuit are adjusted, and sensitivity of a Hall switch can be adjusted through small step length within a large range.
Description
technical field [0001] The invention relates to the field of Hall sensors, in particular to a programmable switch Hall sensor. Background technique [0002] The switch-type Hall sensor is a magnetic field sensor manufactured according to the Hall effect. It is widely used in industrial control, consumer electronics, automotive electronics and other fields for non-contact position detection, speed detection, etc. [0003] A conventional switch-type Hall sensor usually includes a voltage regulator, a Hall sheet, a Hall voltage differential amplifier, a threshold voltage generating circuit, a hysteresis comparator, and an output stage. The Hall sheet induces a magnetic field to generate a Hall voltage, which is amplified by a differential amplifier and compared with the threshold voltage provided by the threshold voltage generation circuit, and the comparison result is output from the hysteresis comparator to the power output stage. [0004] When the strength of the south pol...
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Inventor 彭卓陈忠志赵翔
Owner CROSSCHIP MICROSYST