JPS59158025U - sensor circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a conventional sensor circuit, Figures 2 and 4 are circuits of an embodiment of this invention, Figure 3 is a timing chart explaining the operation of the circuit in Figure 2, and Figure 5 is the same as in Figure 3. A specific example of the circuit buffer 15 will be shown. 1.2... Magnetoresistive element, 5... Blitz, 6...
・Comparator, 7... Return resistor, 15... Buffer,
17... Memory circuit, 18... Gate, 19... Sensor drive pulse application terminal, 20... Output terminal.

Claims (1)

[Scope of utility model registration request] A resistive bridge 5 including at least one magnetoresistive element, a comparator 6 for comparing the unbalanced voltage of this bridge, and a sensor driving pulse 1 which is a periodic and narrow pulse width electric signal applied from the outside. a buffer 15 that intermittently supplies driving power to the resistance bridge 5 and the comparator 6;
a memory circuit 17 that latches the output of the comparator 6 at the moment the power is cut off; and a gate that receives the output of the memory circuit 17 and the sensor drive pulse as input and outputs the output of the memory circuit 17 only when the sensor is driven. 18, and a return resistor 7 for positive return connected between the output of this gate and one input of the comparator 6, and when the gate is not driven as determined by the sensor drive pulse. A state “High” is determined so that no current flows through the return resistor 7.
A sensor circuit comprising a gate that outputs "h" or "Low".