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TCA505BG Datasheet(PDF) 6 Page - Siemens Semiconductor Group |
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TCA505BG Datasheet(HTML) 6 Page - Siemens Semiconductor Group |
6 / 18 page Semiconductor Group 6 TCA 505 BG Pin Functions Pin 1; LC The resonant circuit of the proximity switch is connected between LC and ground. Pin 2; RDi A resistor between this pin and ground sets the current in the oscillator circuit. The greater the value of the resistor, the smaller is the current feed from the oscillator into the resonant circuit and the greater therefore is the switching distance. The greater the Q of the resonant circuit, the greater is the value of the distance resistor necessary for setting a certain switching distance. Pin 4; CI CI can remain open; if high noise immunity is to be achieved however, this pin should be provided with a series RC element (RI, CI). If pin CD is not used, a correctly dimensioned RC element on this pin will also prevent any erroneous pulses on the output when the supply voltage is turned on (see application circuit 1). Pin 5; RHy Depending on the status of the circuit, RHy will be high-impedance or low-impedance to ground (open collector). If the distance resistance (see RDi) is split into two resistors RDi and RHy, a distance hysteresis can be set by means of RHy. If series hysteresis is applied, RHy is connected in series with RDi or shorted. If parallel hysteresis is applied, RHy is connected in parallel with RDi or made high-impedance (see application circuit 1). Pin 6; SC SC serves for short-circuit sensing in the output circuit that is to be protected. The current can be sensed referred to ground or VS. The current sensing is made by a dedicated resistor in the output circuit. For a voltage drop ≥ 0.3 V across VS and SC or across ground and SC, all outputs are turned off after the turn-OFF delay (brief glitches on the outputs or the charging of line capacitances therefore do not trigger the short-circuit protection). After a pause about 200 times the turn-off delay, the outputs turn-ON again. If the short-circuit is still present, the turn- OFF cycle will start up anew. |
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