A17201 ALLEGRO
Document overview
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Technical content
The A17201 is an AC-coupled Hall-effect sensor IC which includes monolithic integrated circuits that switch in response to changing differential magnetic fields created by rotating ring magnets or, when coupled with a magnet, by ferrous targets. This device also includes an integrated tracking capacitor that provides the high accuracy of analog sensing without an external filter capacitor. This reduces cost and components, while improving the reliability of the final sensor solution. Magnetic field changes affect the two integrated Hall transducers and then are differentially amplified on the chip. Differential design provides immunity to radial vibration, within the device operating air gap range, by rejection of this common-mode signal change. Steady-state system offsets are eliminated using an on-chip differential bandpass filter with integrated capacitor. This filter also provides relative immunity to interference from electromagnetic sources. The device uses advanced temperature compensation for the high-pass filter, sensitivity, and Schmitt trigger switchpoints to guarantee optimal operation to low frequencies over a wide range of air gaps and temperatures. A17201-DS, Rev. 3 MCO-0000390
- Integrated tracking capacitor
- Integrated capacitor reduces requirements for external EMI protection components (UB package)
- Used for sensing motion of ring magnet or ferrous targets
- Wide operating temperature range
- Operation with magnetic input signal frequency from
8 Hz to 20 kHz
- Large effective air gaps
- 3.5 to 24.0 V supply operating range
- Reverse battery protection
- Resistant to mechanical and thermal stress Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter Capacitor PACKAGES: Figure 1: Functional Block Diagram Not to scale A17201 Continued on next page... FEATURES AND BENEFITS DESCRIPTION April 12, 2019 3-pin SIP, matrix HD style (suffix UA) Hall Amp Regulator Bandpass Filter Integrated Tracking Capacitor VCC (Pin 1) 2.2 nF (UA Package Only) VS+ Gain Stage Dual Hall Transducers Comparator VREF Output Control 2-pin SIP (suffix UB)
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Supply Voltage VCC 28 V Reverse Supply Voltage VRCC –18 V Operating Ambient Temperature TA Range L –40 to 150 °C Maximum Junction Temperature TJ(MAX) 165 °C Storage Temperature Tstg –65 to 170 °C SELECTION GUIDE Part Number Package Packing [1] Operating Ambient Temperature Range, TA (°C) Supply Current ICC(LOW) min ICC(LOW) max A17201LUAA-I1 3-pin through hole SIP Bulk, 500 pieces per bag –40 to 150 3 7 A17201LUBATN-I1 2-pin through hole SIP 4000 pieces per 13-inch reel –40 to 150 3 7 [1] Contact Allegro for additional packing options. DESCRIPTION (continued) The device includes: a voltage regulator, two Hall transducers, temperature compensating circuitry, a signal conditioning amplifier, bandpass filter, Schmitt trigger, and an output control. The on-board regulator permits operation with supply voltages from 3.5 to 24 V . The regulated current output is configured for two-wire interface circuitry and is ideally suited for obtaining speed information in wheel speed applications. The device packages have an operating ambient temperature range of –40°C to 150°C, and are provided in a 3-pin plastic SIP (suffix UA) or a 2-pin plastic SIP (suffix UB). Both packages are lead (Pb) free, with 100% matte-tin-plated leadframes.
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Terminal List Name Number
Description
GND 3 – Ground PINOUT DIAGRAMS AND TERMINAL LIST 2 31 Pinout Diagram Pinout Diagram INTERNAL DISCRETE CAPACITOR RATINGS (UB PACKAGE ONLY) Characteristic Symbol Test Conditions Value (Typ.) Unit Nominal Capacitance CSUPPLY Connected between VCC and GND 2.2 nF
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com OPERATING CHARACTERISTICS: Valid throughout full operating and temperature ranges, unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. [1] Max. Unit
ELECTRICAL CHARACTERISTICS
Supply Voltage [2] VCC Operating, TJ < TJ(MAX) 3.5 12 24 V Reverse Supply Current [3] IRCC VCC = –18 V – – –1 mA Supply Zener Current IZSUPPLY VCC = 28 V – – 19 mA Supply Zener Clamp Voltage VZSUPPLY ICC = ICC(MAX) + 3 mA, TA = 25°C 28 33 37 V Supply Current ICC(LOW) Low-current state 3 – 7 mA ICC(HIGH) High-current state 12.0 – 16.0 mA RESPONSE CHARACTERISTICS Power-On Time [4][5] tPO VCC > VCC(MIN) – 7 15 ms Settling Time [5][6] tSETTLING fBdiff ≥ 100 Hz – – 310 ms Response Time [5] tRESPONSE Equal to tPO + tSETTLING; fBdiff ≥ 100 Hz – – 325 ms Upper Corner Frequency [7] fCU –3 dB, single pole 20 – – kHz Lower Corner Frequency [7] fCL –3 dB, single pole – – 8 Hz OUTPUT CHARACTERISTICS [8] Output Slew Rate Time dI/dt No load (UA package only) 7 – – mA/μs Output Rise Time tr ΔI/Δt from 10% to 90% ICC level; corresponds to measured output slew rate with CSUPPLY – – 1.5 μs Output Fall Time tf ΔI/Δt from 90% to 10% ICC; corresponds to measured output slew rate with CSUPPLY – – 1.5 μs MAGNETIC CHARACTERISTICS Operate Point [9] BOP Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p, ICC switches from low to high – 7 17.4 G Release Point [8] BRP Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p, ICC switches from high to low –17.4 –7 – G Hysteresis [8] BHYS fBdiff = 200 Hz, Bdiff = 50 Gp-p – 14 – G Applied Magnetic Field [10] Bdiff Differential p-p magnetic field – – 1250 G [1] Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits. [2] Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section. [3] Negative current is defined as conventional current coming out of (sourced from) the specified device terminal. [4] Time required to initialize device. [5] See Definitions of Terms section. [6] Time required for the output switchpoints to be within specification. [7] The specification is based on statistical evaluation of a limited sample population. [8] Load circuit is RL = 100 Ω and CL = 10 pF. Pulse duration measured at threshold of ((ICC(HIGH) + ICC(LOW)) / 2). [9] For lower frequencies, the absolute values of BOP, BRP, and BHYS may decrease due to delay induced by the high-pass filter. [10] Exceeding the maximum magnetic field may result in compromised absolute accuracy.
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information Characteristic Symbol Test Conditions Value Units Package Thermal Resistance RθJA Package UA, 1-layer PCB with copper limited to solder pads 165 °C/W Package UB, 1-layer PCB with copper limited to solder pads 213 °C/W Ambient Temperature, T (ºC)A Ambient Temperature, T (ºC)A m u m i x a M V e l b a w o l l A ) V ( C C P , n o i t a p i s s i D r e w o P ) W m ( D V (max)CC V (min)CC 1000 900 800 700 600 500 400 300 200 100 20 40 60 80 100 120 140 160 180 Power Dissipation versus Ambient Temperature Power Derating Curve 20 40 60 80 100 120 140 160 180
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEFINITION OF TERMS The following provides additional information about some of the parameters cited. For additional information, visit the Allegro website at www.allegromicro.com. Applied Magnetic Field, B diff – The differential magnetic flux density, which is calculated as the arithmetic difference of the flux densities observed by each of the two Hall elements. f Bdiff is the input signal frequency. Output Off Switchpoint (Operate Point), BOP – The value of increasing differential magnetic flux density at which the out- put signal, ICC switches from ICC(LOW) to ICC(HIGH). Output On Switchpoint (Release Point), BRP – The value of decreasing differential magnetic flux density at which the output signal, ICC from ICC(HIGH) to ICC(LOW). Power-On Time, tPO – The time needed by the device, after power is applied, to initialize all circuitry necessary for proper operation. Settling Time, t SETTLING – The time required by the device, after tPO, and after a valid magnetic signal has been applied, to provide proper output transitions. Settling time is a function of magnetic offset, offset polarity, signal phase, signal frequency, and signal amplitude. Response Time, t RESPONSE – The total time required for generating zero-crossing output transitions after initialization (the sum of Power-On Time and Settling Time).
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com APPLICATIONS INFORMATION The A17201 is a versatile high-precision differential sensor IC that can be used in a wide range of applications. Proper choice of the target material and shape, magnet material and shape, and assembly techniques enables large working air gaps and high switchpoint accuracy over the device operating temperature range. Device Operation The A17201 contains two integrated Hall transducers that are used to differentially respond to a magnetic field across the surface of the IC. As shown in Figure 2, the trigger switches the output signal I CC high when the differential magnetic field crosses the BOP level while increasing in strength (referred to as the positive direction) and switches the output signal, ICC low when the differential magnetic field crosses BRP while decreasing (the negative direction). Start-Up During power-on time, tPO, the output signal, ICC is high. Beyond this time, if the applied magnetic field, Bdiff, is smaller than BHYS, the switching state and output polarity are indeterminate. ICC will be valid for Bdiff > BHYS, after the additional settling time, tSETTLING, has also elapsed. Delay The bandpass filter induces delay in the output signal, I CC, rela- tive to the applied magnetic field, Bdiff. Simulation data shown in the Characteristic Data section quantify the effect of the input signal amplitude on the phase shift of the output. Positive values of delay indicate a lagging output, while negative values indicate a leading output. Figure 2: Typical Output Characteristic BRP BOPApplied Magnetic Field, Bdiff Output Signal, ICC ICC(HIGH) ICC(LOW)
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com AC-Coupled Operation Steady-state magnet and system offsets are eliminated using an on-chip differential bandpass filter. The upper and lower cutoff frequencies of this patented filter are set using an internal inte- grated capacitor. The differential structure of this filter improves the ability of the IC to reject single-ended noise on the GND or VCC lines and, as a result, makes the device more resistant to EMI (electromagnetic interference) typically seen in hostile remote-sensing environments. Power Supply Protection The device contains an on-chip voltage regulator and can operate over a wide supply voltage range. In applications that operate the device from an unregulated power supply, transient protec- tion must be added externally. For applications using a regulated line, EMI/RFI protection may still be required. The circuit shown in Figure 3 is the most basic configuration required for proper device operation. Typical Circuit A resistor sense, R L, to exhibit two wire output between GND and Pin 2, is shown in Figure 3. Figure 3: Typical Application Circuits A17201UA VCC GND VCC RL 100 Ω CL CBYPASS 2.2 nF A17201UB VCC GND VCC RL 100 Ω CL
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com POWER DERATING The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- cation. This section presents a procedure for correlating factors affecting operating T J. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RθJA, is a figure of merit sum- marizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, R θJC, is relatively small component of RθJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN × IIN (1) ΔT = PD × RθJA (2) TJ = TA + ΔT (3) For example, given common conditions such as: TA= 25°C, VCC = 3.5 V, ICC = 12 mA, and RθJA = 165°C/W, then: PD = VCC × ICC = 3.5 V × 12 mA = 42 mW Δ T = PD × RθJA = 42 mW × 165°C/W = 6.9°C TJ = TA + ΔT = 25°C + 6.9°C = 31.9°C A worst-case estimate, PD(max), represents the maximum allow- able power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RθJA and TA. Example: Reliability for VCC at TA = 150°C, package UA, using single-layer PCB. Observe the worst-case ratings for the device, specifically: RθJA = 165°C/W, TJ(max) = 165°C, VCC(max) = 24 V , and ICC(max) = 16 mA (Note: ICC(LOW) = 7 mA, ICC(HIGH) = 16 mA with a duty cycle of 50.0% and a worst case means ICC of 11.5 mA). Calculate the maximum allowable power level, PD(max). First, invert equation 3: ΔTmax = TJ(max) – TA = 165°C – 150°C = 15°C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 165°C/W = 90 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 90 mW ÷ 11.5 mA = 7.8 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli- able operation between VCC(est) and VCC(max) requires enhanced RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions.
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PACKAGE OUTLINE DRAWING Figure 4: Package UA, 3-pin SIP Gate and tie bar burr area A B C Dambar removal protrusion (6×) D D Branding scale and appearance at supplier discretion Active Area Depth, 0.50 ±0.08 mm Standard Branding Reference View Mold Ejector Pin Flash Protrusion XXX E E E 1.40 1.44 E Hall elements (E1, E2), not to scale E 1.30 E E1 E2 2 31
1.27 NOM
1.02 MAX 45° 45° C 1.52 ±0.05 B A 0.41 +0.03 –0.06 0.43 +0.05 –0.07 14.99 ±0.25 4.09 +0.08 –0.05 3.02 +0.08 –0.05
0.79 REF
10° Branded Face For Reference Only – Not for Tooling Use NOT TO SCALE Dimensions in millimeters Dimensions exclusive of moldfl ash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown (Reference DWG-0000404, Rev. 1)
0.51 REF
Line 1: Logo A Line 2: 3-digit assigned brand
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PACKAGE OUTLINE DRAWING Figure 5: Package UB, 2-pin SIP Mold Ejector Pin Indent
0.25 REF
0.30 REF
4 × 2.50 ±0.10 4 × 7.37 REF 4 × 0.85 REF 4 × 0.85 REF
0.38 REF
45° B 4 × 10° A D Branded Face 0.25 +0.07 –0.03 0.42 ±0.05 1.00 ±0.05
2.54 REF
12.20 ±0.10 A B C C DB randing scale and appearance at supplier discretion F F E 1.35 E2 EE E 1.30 E 1.34 E Line 1: 5-digit Part Number Line 2: 4-digit Date Code Line 3: Characters 5, 6, 7, 8 of Assembly Lot Number XXXXX Date Code Lot Number Standard Branding Reference View For Reference Only–N ot for Tooling Use (Reference DWG-0000408, Rev. 3) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Dambar removal protrusion (8×) Gate and tie bar burr area Active Area Depth, 0.38 mm ±0.03 Hall elements (E1 and E2); not to scale Molded Lead Bar for alignment during shipment 0.85 ±0.05 0.85 ±0.05 4.00 4.00 1.80 ±0.10 1.50 ±0.05 1.50 ±0.05 4.00 +0.06 –0.05 +0.06 –0.07 1.80+0.06 –0.07 +0.06 –0.05 18.00 ±0.10 0.65 ±0.07
Two-Wire AC-Coupled Differential Sensor IC with Integrated Filter CapacitorA17201 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com For the latest version of this document, visit our website: www.allegromicro.com
Revision History
– March 12, 2018 Initial release
1 September 4, 2018 Changed part number
2 November 30, 2018 Updated part numbers in selection guide
3 April 12, 2019 Updated selection guide (page 2) and supply current (page 4)
Copyright 2019, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents.