HKZ121 SIEMENS | Alldatasheet

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Technical content

Features

l Contactless switch with open collector output (40 mA) l Static switching l High switching frequency l Hermetically sealed with plastic l Unaffected by dirt, light, vibration l Large temperature and voltage range l Integrated overvoltage protection l High interference immunity l Integrated capacitors for EMI protection HKZ 121 Bipolar IC PackageType Ordering Code HKZ 121 Q67000-A9097-A401 P-HKZ-3-1 Hall-Effect Vane Switch P-HKZ-3-1

The Hall-effect switch is actuated by a soft-iron vane that passes through the air gap between magnet and Hall-effect sensor. The vane short-circuits the magnetic flux before the hall-effect sensor, as shown below. The open collector output is conductive (low) when the vane is outside the air gap, and blocks (high) when the vane is introduced into the air gap. The output remains high as long as the vane remains in the air gap. This static function does not require a minimum operating frequency. The output signal shape is independent of the operating frequency. The circuit features integrated overvoltage protection against most of the voltage peaks occur- ring in automotive and industrial applications. The output stage has a Schmitt trigger charac- teristic. Most electronic circuits can be driven directly due to the open collector output current of max. 40 mA. Principle of Operation Mechanical Characteristics The Hall-effect vane switch is hermetically sealed in a special plastic package, so that it can also be used under harsh environmental conditions. The package is waterproof, vibration- resistant and resistant to gasoline, oil and salt. Two tubular rivets are incorporated in the package to mount the sensor on its carrier plate. The circuit has three flexible leads for power supply, output and ground. a) Magnetic flux through the Hall-effect switch with no vane in the gap b) Magnetic flux short-circuited by the soft-iron vane

The output current of the "open collector" must be limited to the maximum permissible value by a load resistor adapted to the application. For optimum efficiency of the integrated overvoltage protection, it is suggested that a resistor of approx. 100W be provided in the component's power supply to limit the current. Absolute Maximum Ratings Operating Range Parameter Symbol min. max. Unit Test ConditionLimit Values Supply voltage Output voltage in OFF-state VS VQ – 1.2 – 0.8 V V V T A = 25 ˚C Ambient temperature Storage temperature T A Tstg – 40 – 40 135 150 Inverse supply current (limited externally) Output current Inverse output current S IQ –IQ 200 mA mA mA TA £ 80 ˚C t£ 1 h without vane Thermal resistance system - air R th SA – 170 K/W – Vane1): thickness width gap length immersion depth gap height a b c h d 0.5 4.6 7.3 – h mm mm mm mm mm Supply voltage VS 4.5 24 V – Ambient temperature TA – 40 130 ˚C – 1) see Figure Mechanical Measurement Conditions

VS = 5 V to 18 V,TA = – 30 to 130 ˚C Switching Point Characteristics Definitions In most applications, the switching point is set exactly by mechanical adjustment, thus compensating all mechanical tolerances in the system including the scatter of the Hall-effect vane switch. For the function of the device in operation, only the deviations of those characteristics are important on temperature and operating voltage. The characteristic values of the switching points are, therefore, not directly referred to the mechanical dimensions of the vane switch, but to an electrically defined symmetry B according to formula 1): 1)B0 = (ONleft + OFFleft + ONright + OFFright): 4 B0 = A0 – 0.3 mm The definition of the operate and release points is shown the following figure. Operate point fON is obtained by subtracting the measured ON operate value from the reference point B0: 2)fON = ONright –B0 =B0 – ONleft The release pointfOFF is calculated from the difference between the appropriate ON and OFF points: 3)f OFF = ONright – OFFright = OFFleft – ONleft fON 0 and fOFF 0 are the switching points measured for the individual component under normal conditions (VS = 12 V,TA = 25 ˚C) within the characteristic device deviation. The deviations of the operate and release points are defined according to 4): 4)DfON =fON –fON 0 DfOFF =fOFF –fOFF 0 Parameter Symbol min. max. Unit Test ConditionLimit Values Output saturation voltage VQ sat –– 0.4 0.6 V V without vane I Q = 40 mA TA = – 30 to 110 ˚C TA = 110 to 130 ˚C Output reverse current Supply current I Q R IS mA mA with vane without vane Fall time tHL –1 ms IQ = 40 mA Overvoltage protection – Supply voltage(VS) – Output(VQ ) VSZ VS0 V V IS = 16 mA IS = 16 mA

Switching Point Definitions

Mechanical Measurement Conditions Switching Point Characteristics Vane: a = 0.75 mm, b = 8 mm, c = 10 mm Position: center of air gap V S = 5 V to 18 V Parameter Symbol min. typ. Unit Test ConditionLimit Values HKZ 121 Operate point Deviations fON 0 DfON 0.85 – 0.4 – 0.2 – 0.4 1.45 0.15 0.15 0.2 mm mm mm mm V S = 12 V,TA = 25 ˚C TA = – 30 to 25 ˚C TA = 25 to 80 ˚C TA = 80 to 130 ˚C Release point Deviations fOFF 0 DfOFF 1.54 – 0.8 – 0.4 – 0.8 2.54 0.3 0.3 0.4 mm mm mm mm V S = 12 V,TA = 25 ˚C TA = – 30 to 25 ˚C TA = 25 to 80 ˚C TA = 80 to 130 ˚C max. 2.05 0.7 0.4 0.7 3.54 1.4 0.8 1.4

Special Package, P-HKZ-3-1 (Plastic Hall-Effect Vane Switch) GHK05083