TCA705 | DigiCamel IC Datasheet

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IC for Inductive Proximity Switches with TCA 705

0.5 A Output Stage

Features oo — © Output current up to 500 mA @ Switch-ON and switch-OFF @ High-side-switch and low-side-switch © Short-circuit and overload protection © Supply voltage range from 7.5 V to 65 V “esosins @ Few external components i © LED output for *switch-ON/OFF" and short-circuit failure indication | P-Dso-16-1 @ High switching frequency a ee @ High noise immunity, low temperature coefficient @ Temperature protection Type TOrdering Code | Package VY TCA705G | Q67000-A8310 _ P-DSO-16-1 (SMD) YY New type The TCA 708 is a monolithic IC in the new Smart Power Technology (SPT) for designing excellent inductive proximity switches at low cost and with little space. Features like 0.5 A output current, short-circuit, overload and temperature protection classify the TCA 705 as a versatile general- purpose circuit. The separate LED output indicates the switching state of the sensor (switch-ON / switch-OFF) and an eventual short-circuit failure. Semiconductor Group 860 9.92

aocdi] ‘sfoas QLeDcy2 15D NC. Vec)3| 140 GND scaq4 4300 NC Nc.cqs} 12-0 No Veer6} = POC, O47] 10 Ross Res | _ 9-1 1eponss Pin Configurations (top view) Pin Definitions and Functions Pin "Symbol [Function a 1 i QD co open drain 2 _ OLED | Output LED 3 {Ys | Supply voltage 4 (se | short-circuit detector 5 N.C. ' Not connected

6 Vaer Reference voltage

7 Co Turn-ON delay / Turn-OFF delay / Short-circuit delay

8 Ris Hysteresis

8 Rie oe —

9 Lc Oscillator

10 Row Distance

4 G Integrating capacitance

12 ‘NO Input driver (normally open)

13 NC Input driver (normally closed)

14 ‘ano ! Ground 18 NC. Not connected 16 as Output; open source Semiconductor Group 861

fF i Turn on-of f= ; , | | Shortcircuit~ Divider Leo in short- : ateo Ys detector arena by 256 Driver detector Under- Voltage Output V voltage Driver fr Regulator ltage Stage op | r 4 16 as , Threshold uc Oscillator Demodulator switch Ry C, NO NC. Ry GND Block Diagram Semiconductor Group 862

Pins 116: QD, QS A load has to be connected between QS and ground, i.e. high-side switch respectively between QD and Vs, i.e. low-side switch. The current through the load is 500 mA max. To protect the IC against destruction by short-circuit or overload, a capacitor has to be connected between pin C, and ground. Pin 2: QLED Output QLED drives a LED with up to 10 mA, connected between QLED and V5. The LED indicates the switching state (switch-ON / switch-OFF) and blinks during an eventual short-circuit failure. Pin 3: Vs Outputs QD , QS and QLED are inhibited as long as the voltage on Vs is below approx. 7.5 V. They are enabled between approx 8.0 and 8.5 V, the basic function of the circuit is then ensured, During the turn-ON and turn-OFF of V, there are consequently no undesirable static states. The operating data and characteristics apply upwards from 8.5 V. See pin Cy for the avoidance of erroneous pulses during oscillator built-up. Pin 4: 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 (see application circuits 2 and 3). The current sensing is made by a dedicated resistor (Rgc) 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 of about 200 times of the turn-OFF delay, the outputs turn on again. If the short-circuit is still present, the turn-OFF cycle will start up a new. Pin 6: Vaer The internal stabilized voltage of the IC of approx. 3.5 V appears on this pin. A capacitor can be connected between Vags and ground to improve the noise immunity of the overall circuit function. The output current at this pin is up to 10 mA. 12. Pin7:C, A capacitor on this pin delays the activation of the output after the supply voltage is applied (turn-ON delay). In this way erroneous pulses are prevented on the output during built-up of the oscillator. If Vs falls to less than 7.8 to 8 V, the output is not inhibited until after a turn-OFF delay time, this also being determined by Cy. In this way the delayed turn-ON operation described above is suppressed if there are just short glitches (voltage dips) on Vs. This is of particular advantage for large core diameters, because in such cases a relatively long turn-ON delay has to be selected, since this would otherwise start to run every time there was a brief voltage dip. The capacitor Cy also sets the turn-OFF delay and the pause duration in short-circuit operation. Semiconductor Group 863

Pin 8: Riys Depending on the status of the circuit, Rj, will be high-impedance or low-impedance to ground (open collector). If the distance resistance (see Row) is split into two resistors Row aNd Riys, @ distance hysteresis can be set by means of Ry,,.. If series hysteresis is applied, Rj.,. is connected in series with Rog or shorted, If parallel hysteresis is applied, Ris. iS connected in parallel with Ros: or made high-impedance (see application circuit 1). Pin 9: LC The resonant circuit of the proximity switch is connected between LC and ground. Pin 10: Rows Aresistor 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 quality of the resonant circuit, the greater is the value of the distance resistor necessary for setting a certain switching distance. Pin 11: C, C, can remain open; if high noise immunity is to be achieved however, this pin should be provided with a serial RC element (R,, C). If pin 7 (Co) is not used, a correctly dimensioned RC element on pin C, will also prevent any erroneous pulses on the output when the supply voltage is turned on (see application circuit 1). Pins 11/12/13: C,,NO, NC A direct connection between C, and NO will result in a "normally open” output stage, i. e. switch-ON. A direct connection between C, and NC will result in a “normally closed" output stage, i. e. switch- OFF. ‘Semiconductor Group 864

Resonant circuit, normally open, not damped: uc 00 esege ©: Non- 2 | Conducting ogee) ©€é: oas NO GL] bac Resonant circuit, normally open, damped: uc oo =~ I | Conducting Bq (CE eas NO GL _]™ bye Normally Non- ; ait Conducting Conducting Normally Non- Closed Conducting ‘ CNC Conducting esos? Operational Diagram Semiconductor Group 865

This circuit is used to design inductive proximity switches. The resonant circuit of the LC oscillator is implemented with an open half-pot ferrite and a capacitor in parallel (pin LC). If a metallic target is moved closer to the open side of the hall-pot ferrite, energy is drawn from the resonant circuit and the amplitude of the oscillation is decreasing accordingly. This change in amplitude is transmitted to a threshold switch by means of a demodulator and triggers the output (see operation schematic). By means of an external distance resistor R on the oscillator (pin Ros) it is possible to set the switching distance within wide limits. The optimal distances are 0.1 to 0.6 of the diameter of the half- pot ferrite in use, but extensions to both of these parameters can also be produced. The circuit also enables the setting of a path hysteresis by switching an external distance resistor (R,) via pin Ruy, (see application circuit 1). The device includes one integrated output stage for max. 500 mA output current. It can be used as “normally open" or "normally closed" by means of programming the NO-respectively NC-input driver and as a high-side- or low-side-switch (See application circuits 2 and 3). The output stage is automatically protected against destruction by short-circuit or overload. By means of a capacitor on pin Cp it is possible to set the response delay and the turn-OFF time of short-circuit protection. The same capacitor also defines the turn-ON delay of the output stage when the supply voltage is applied, whereby the output stage is inhibited during built-up of the oscillator. Finally Cy is used to produce a turn-OFF delay of the output stage so that the turn-ON delay is prevented from running its full length if there are brief voltage dips on Vs. Semiconductor Group 866

T,= 4010 110°C Parameter - "symbol T Limit Values | Unit | Test Condition \\ min. |max. | Supply voltage _ Vs —03 |70 - Output voltage ~ Vo |-03 - oO Output current =o i- |— | internally limited Current from Vacs —Inp CO na | = —_ Voltage on SC Vee To Vs iVvO- oe Current from Ros: = Trost Oo 2 ma |- Current to Ry, Ireys ‘o 2 mA i Storage temperature Tag “lies [125 Ic |= Thermal resistance Rosa c= 110 Kw = (system-air) Junction temperature TT, “= y5 cc IH - Capacitor on Cp ie ~ i= 50 [nF |= — Operating Range Supply voltage Vs 175 65 Iv j- . ‘Ambient temperature TT; “To40 [to Fe = 7 Distance and i hysteresis resistance R, and R,, in series Ry “1300 |= a | a Ra 0 - a |- R, and R,, parallel - (Q - _ Output current — _ -lo i= [500 [ma |- Semiconductor Group 867

7.5 V< Vs<65V; Ty=- 40 to 110°C

Parameter Symbol Limit Values ‘Unit —_ — min, typ, jax | - Power Supply (Vs) ee — _ Current consumption = Is is 550 |750 [pA - Tur-ON threshold "Vrows - 80 85 Vv (output active) | _ | _ _ Tur-OFF threshold Viores 75 80 |- Vv (output disabled) : Hysteresis Viows ~ Vrowes Vis |; 40 I nv Reference Voltage "Veer 30 33 35 mv Oscillator (LC, Row) oe oe Oscillator frequency fos - = [8 Mae Oscillator amplitude | Aose - 08 Ve Demodulator, Threshold Switch (C,, Riya) Threshold on C,_ Vey a nl) Hysteresison Cy pM: i OB fe IV — Current in C, Tey - 7 = yA Current from C = le jc 8 ~ nA 7 Switching frequency fs — 5 = kHz (C,< 50 pF) i a Integrating capacitance Cc | - 1 i. nF Reference Voltage (Ver) Reference voltage Veee 30 133 '35 Vv a Turn-ON, Turn-OFF and Short-Circuit Delay (Co) Turn-ON delay Ioow [0.48 |0.65 | 0.82 | msinF ek. —— — — Tagan lon aan Tumn-OFF delay Na 17.0 (25 34.0“ usinF Short-circuit turn-OFF delay tse 1.70 (2.5 i 3.40 | us/nF Short-circuit pause te 035 105 0.65 msinF Semiconductor Group 868

. sc Veer ao w= TCA705 as QLeD Rot Rays C1 NO N.C. GNO * | Series Hysteresis af] Ry Parallel Hysteresis Ln ksotse Application Circuit 1 Series Hysteresis / Parallel Hysteresis For explanation see under “Pin Functions” Semiconductor Group 870

4 U | optional

G al] fl [] toae High-side-switch, short-circuit-proof, LED indicator, normally closed {normally open). Short-circuit sensing: Rgc= 22% max.lg 1esots9 Application Circuit 2 Semiconductor Group 871

075 ..65V i ot [ |? ¥, G, 5s fy sc y7 Veer ao | 7 [ oueD Rost Ris Cy NO N.C. GND R, : i * u | optional G * [] d [] @s Low-side-switch, short-circuit-proot, LED indicator, normalty open (normally closed). Short-circuit sensing: Re, = 22 max.T ‘TESONGO Application Circuit 3 Semiconductor Group 872

Product Information

TCA705 specifications and overview.

Summary

IC for inductive Proximity Switches with 0.5 A Output Stage

Description

IC for inductive Proximity Switches with 0.5 A Output Stage

Source title TCA705 Datasheet(PDF) - Siemens Semiconductor Group

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