Dynamic Differential Hall Effect Sensor IC TLE 4923

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1 Dynamic Differential Hall Effect Sensor IC TLE 493 Bipolar IC Features Advanced performance Higher sensitivity Symmetrical thresholds High piezo resistivity Reduced power consumption South and north pole pre-induction possible AC coupled Digital output signal Two-wire interface Large temperature range Large airgap Low cut-off frequency Protection against reversed polarity P-SSO-3-6 P-SSO-3-6 Type Marking Ordering Code Package TLE B Q675-K48 P-SSO-3-6 The differential Hall effect sensor TLE 493 is compatible to the TLE 49-3U, except for having a -wire interface. The TLE 493 provides high sensitivity, a superior stability over temperature and symmetrical thresholds in order to achieve a stable duty cycle. TLE 493 is particularly suitable for rotational speed detection and timing applications of ferromagnetic toothed wheels such as in anti-lock braking systems, transmissions, crankshafts, etc. The integrated circuit (based on Hall effect) provides a digital signal output with frequency proportional to the speed of rotation. Unlike other rotational sensors differential Hall ICs are not influenced by radial vibration within the effective airgap of the sensor and require no external signal processing. Data Sheet -7-

2 Pin Configuration (top view).67 Center of sensitive area ± V GND C S AEP39 Figure Pin Definitions and Functions Pin No. Symbol Function V S Supply voltage GND Ground 3 C Capacitor Data Sheet -7-

3 V S Protection Device Internal Reference and Supply V reg (3V) Hall-Probes Amplifier Highpass- Filter Schmitt- Trigger GND C F 3 AEB896 Figure Block Diagram Data Sheet 3-7-

4 Functional Description The Differential Hall sensor IC detects the motion and position of ferromagnetic and permanent magnet structures by measuring the differential flux density of the magnetic field. To detect ferromagnetic objects the magnetic field must be provided by a back biasing permanent magnet (south or north pole of the magnet attached to the rear unmarked side of the IC package). Using an external capacitor the generated Hall voltage signal is slowly adjusted via an active high pass filter with low frequency cut-off. This causes the output to switch into a biased mode after a time constant is elapsed. The time constant is determined by the external capacitor. Filtering avoids aging and temperature influence from Schmitt-trigger input and eliminates device and magnetic offset. The TLE 493 can be exploited to detect toothed wheel rotation in a rough environment. Jolts against the toothed wheel and ripple have no influence on the output signal. The on and off state of the IC are indicated by high and low current consumption. Circuit Description (see Figure ) The TLE 493 is comprised of a supply voltage reference, a pair of Hall probes spaced at.5 mm, differential amplifier, filter for offset compensation, Schmitt-trigger, and a switched current source. The TLE 493 was designed to have a wide range of application parameter variations. Differential fields up to ± 4 mt can be detected without influence to the switching performance. The pre-induction field can either come from a magnetic south or north pole, whereby the field strength up to 5 mt or more will not influence the switching points ). The improved temperature compensation enables a superior sensitivity and accuracy over the temperature range. Finally, the optimized piezo compensation and the integrated dynamic offset compensation enable easy manufacturing and elimination of magnet offsets. Protection is provided at the input/supply (pin ) for reverse polarity. ) Differential bias fields exceeding ± mt, e. g. caused by a misaligned magnet, should be avoided. Data Sheet 4-7-

5 Absolute Maximum Ratings Parameter Symbol Limit Values Unit Remarks min. max. Supply voltage V S 8 ) 4 V Capacitor voltage V C.3 3 V Junction temperature Junction temperature Junction temperature Junction temperature Storage temperature T S 4 5 C Thermal resistance R th JA 9 K/W ) C C C C 5 h 5 h 5 h 4h ) Reverse current drawn by the device < ma ) Can be reduced significantly by further packaging process, e. g. overmolding. The device is ESD protected up to kv (HL test procedure) Note: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Operating Range Parameter Symbol Limit Values Unit Remarks min. max. Supply voltage V S V Junction temperature 4 9 C Pre-induction B 5 5 mt At Hall probe; independent of magnet orientation Differential induction B 4 4 mt Note: Unless otherwise noted, all temperatures refer to junction temperature. In the operating range the functions given in the circuit description are fulfilled. Data Sheet 5-7-

6 AC/DC Characteristics The device characteristics listed below are guaranteed in the full operating range. Parameter Symbol Limit Values Unit Test Condition Test min. typ. max. Circuit Supply current I S Supply current difference ma ma I son - I soff ma.4 3 Supply current ratio I SON / I SOFF Center of switching points: ( B OP + B RP ) / B m.5.5 mt B =. mt, f = Hz, 4 C < ) ) 5 C Center of switching points: ( B OP + B RP ) / B m.7.7 mt B =. mt, f = Hz, 5 C < < ) ) 9 C Hysteresis B hy.5. mt B =. mt, f = Hz 3) Current rise time t r.5 µs Current fall time t f.5 µs Delay time 4) t dop t drp t dop - t drp 5 5 µs µs µs f = khz, B = 5 mt Filter input resistance R C kω 5 C ± C Filter sensitivity to B S C 8.5 mv/ mt 5 C ± C Filter bias voltage V C.6..4 V B = Frequency f 5) Hz B = 5 mt Resistivity against mechanical stress (piezo) 6) B m. B Hy... mt mt F = N Data Sheet 6-7-

7 AC/DC Characteristics (cont d) The device characteristics listed below are guaranteed in the full operating range. Parameter Symbol Limit Values Unit Test Condition Test min. typ. max. Circuit Power Supply Rejection Ratio (PSRR) ) V PSRR V V S modulated with V PSRR, f PSRR = khz, t r,fpsrr =µs, B =, only transition may occur For B values larger than ± mt this value may exceed the limits as follows: B m <.5 B ) Leakage currents at pin 3 should be avoided. The bias shift of B m caused by a leakage current I L can be I L R C ( T) calculated by: B m = See also the typical curves on page 7. S C ( T) 3) Differential pre-induction (e.g. by magnetic misalignment) has to be smaller than mt. 4) For definition see Figure 6. 5) Depends on filter capacitor C F. The cut-off frequency is given as f = The switching points π R C C F are guaranteed over the whole frequency range, but amplitude modification and phase shift have to be taken into account due to the st order highpass filter. 6) For definition see Figure 7. 7) For definition see Figure 5. 7) Note: The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at =5 C and the given supply voltage. Data Sheet 7-7-

8 R P 8 Ω V SZ Ι S V S V LD 4.7 nf V S Ι C ) 3 C V C Ι C GND V = Ι C ) R C C AES897 Figure 3 Test Circuit V S V S 3 C C F µ F GND AES898 R S 8 Ω Figure 4 Test Circuit Data Sheet 8-7-

9 8 V V PSRR 8 V t r t f AED488 Figure 5 B RP B t drp : Delay Time between B = B RP and Ι S LOW to HIGH transient B OP t drp t dop t dop : Delay Time between B = B OP and Ι S HIGH to LOW transient Ι S AED59 Figure 6 Definition of Delay Times (switching points related to initial B = mt; f = Hz) F = N r =.5 ±.5 mm IC 4 x d =.5 AEA58 Figure 7 Setup for Piezo Measurements Data Sheet 9-7-

10 Application Notes Two possible applications are shown in Figure and Figure (Toothed and Magnet Wheel). Two-wire application is shown in Figure. Gear Tooth Sensing In the case of ferromagnetic toothed wheel applications the IC has to be biased by the south or north pole of a permanent magnet (e.g. SmCo 5 (Vacuumschmelze VX7) with the dimensions 8 mm 5mm 3 mm) which should cover both Hall probes. The maximum air gap depends on: the magnetic field strength (magnet used; pre-induction) and the tooth wheel that is used (dimensions, material, etc.; resulting differential field). a centered distance of Hall probes b Hall probes to IC surface L IC surface to tooth wheel L b N S a a =.5 mm b =.3 mm AEA59 Figure 8 Sensor Spacing d T Conversion DIN ASA m = 5.4 mm/p T = 5.4 mm CP DIN d z m T diameter (mm) number of teeth module m = d/z (mm) pitch T = π m (mm) AEA6 ASA p diameter pitch p = z/d (inch) PD pitch diameter PD = z/p (inch) CP circular pitch CP = inch π/p Figure 9 Tooth Wheel Dimensions Data Sheet -7-

11 Gear Wheel Hall Sensor Hall Sensor Signal Processing Circuitry S (N) Permanent Magnet N (S) AEA6 Figure TLE 493, with Ferromagnetic Toothed Wheel Magnet Wheel S N S Hall Sensor Hall Sensor Signal Processing Circuitry AEA6 Figure TLE 493, with Magnet Wheel Data Sheet -7-

12 Two-wire-application Line V S C F µ F 3 C V S GND C S 4.7 nf V SIGNAL R S Sensor Mainframe typical : RS = 8 Ω AES899 Figure Application Circuit Data Sheet -7-

13 ( TLE 493 N(S) S(N) 3 B B Wheel Profile Missing Tooth Magnetic Field Difference B = B-B Small Airgap Large Airgap B RP =.75 mt B HY B OP = -.75 mt Output Signal Ι S Operate point : B-B< B OP switches the output ON high Release point : B-B> B ( RP switches the output OFF low current B = B + RP OP B HY The magnetic field is defined as positive if the south pole of the magnet shows towards the rear side of the IC housing. AED9 Figure 3 System Operation Data Sheet 3-7-

14 If not otherwise specified, all curves reflect typical values at = 5 C and V S =V. Supply Current and Supply Current Minimum Switching Field versus Difference versus Supply Voltage Frequency Ι S ma Ι SON AED473 B min. mt. = 9 C AED Ι SON Ι SOFF.8.6 = 5 C = -4 C = 5 C 4 Ι SOFF V 5 V S Supply Current and Supply Current Difference versus Temperature ma Ι S Ι SON AED474 Hz f Mean Value of Switching Induction. AED476 mt B m ΙSON Ι SOFF.6 4 Ι SOFF.4. B m = B OP f = Hz B RP C typ C Data Sheet 4-7-

15 Hysteresis versus Temperature.6 mt B HY B HY = B RP f = Hz B OP typ AED C Delay Time ) versus Differential Field Delay Time ) versus Temperature t d AED479 8 µ s t dop C Rise and Fall Time versus Temperature T j t drp t d 6. µ s AED478 f = khz 4 ns t t f AED t dop 8 6 t r t drp mt B C T j ) Switching points related to initial B = mt, f = Hz Data Sheet 5-7-

16 Capacitor Voltage versus Temperature AED48.5 V V C. typ.5 Filter Input Resistance versus Temperature RC 6 k Ω 5 4 typ AED C Filter Sensitivity versus Temperature mv/mt S C typ AED48 V S = V C Delay Time t pon for Power ON versus Temperature.8 ms/nf k t pon = k (nf) C F T j AED484 ) max ) min C T j C ) Calculated values for minimum and maximum filter resistance, C F at room temperature. T j Data Sheet 6-7-

17 Threshold Shift versus Filter Leakage 8 mt B m 7 AED C + C +5 C -4 C MΩ R C Data Sheet 7-7-

18 Package Outlines P-SSO-3-6 (Plastic Single Small Outline Package) 5.6 ± ±.5..7 ±.9 max. x 45.5 max ±.5 3.7± ±.6 (.5) max..6 max..4 ± max..67 ± ±.5 max ±.5. ±..65 ±..87 ± ±.5 Adhesive Tape ±.4 4 ±.3.7 ±.3 Tape.5 ±. GPO596 d Branded Side Hall-Probe d : Distance chip to upper side of IC P-SSO-3-6 :.3 ±.8 mm AEA9 Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book Package Information. Dimensions in mm Data Sheet 8-7-

19 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Infineon: TLE493

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