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Technical content

Description

The A1160 is a unipolar, Hall effect switch with an externally enabled diagnostic function. In normal operating mode, the A1160 functions as a standard, unipolar Hall effect switch. The output transistor turns on (output signal switches low) in the presence of a sufficient magnetic field (>B OP(max)). Additionally, the output transistor of the A1160 switches off (output signal switches high) when the magnetic field is removed (< B RP(min)). The A1160 includes conductive coils in close proximity to the Hall element. When the diagnostic feature is enabled, these coils are energized. The energized coils generate an internal magnetic field that can be sensed by the Hall element. While in Diagnostic mode, the output of the A1160 provides a square wave output, which confirms the IC is properly sensing the internally generated magnetic field. The Diagnostic mode exercises the entire magnetic and electrical signal path internal to the IC, fully confirming functionality. Therefore, use of the A1160 either eliminates the need for redundant sensors in safety critical applications or increases robustness in safety critical applications that require redundant sensors (drive-by-wire systems and so forth). The A1160 Hall-effect sensor IC is extremely temperature- stable and stress-resistant, especially suited for operation A1160-DS Features and Benefits

  • Unipolar switchpoints
  • Externally enabled diagnostics feature
  • Diagnostics feature exercises the entire magnetic and electrical signal path within the IC
  • Resistant to physical stress
  • Superior temperature stability through advanced chopper stabilization techniques
  • Output short-circuit protection
  • Internal regulator enables operation from unregulated supplies
  • Reverse battery protection
  • Solid-state reliability
  • Small, surface mount package Chopper-Stabilized Precision Hall Effect Switch With Advanced Diagnostics Functional Block Diagram A1160 Continued on the next page… Approximate footprint VCC VOUTTo all subcircuitsRegulator Dynamic Offset Cancellation Signal Recovery Control Current Limit System Diagnostics Threshold Normal Diagnostic Hall Element VREG DIAG GND Amplifier

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 2Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A. Pin-out Diagram Absolute Maximum Ratings Characteristic Symbol Notes Rating Unit Forward Supply Voltage V CC 30 V Reverse Supply Voltage V RCC –18 V Forward Diagnostic Enable Voltage V DIAG 5.5 V Reverse Diagnostic Enable Voltage V RDIAG –0.5 V Output-Off Voltage V OUT 30 V Continuous Output Current I OUT 25 mA Reverse Output Current I ROUT –50 mA Operating Ambient Temperature T A L temperature range –40 to 150 ºC Maximum Junction Temperature T J(max) 165 ºC Storage Temperature T stg –65 to 170 ºC Terminal List Table Name Number Function DIAG 1, 3 Diagnostics enable (use either pin 1 or pin 3) VCC 2 Connects power supply to chip GND 4 Ground VOUT 5 Output from circuit at temperature ranges up to 150°C. Superior high-temperature performance is made possible through advanced dynamic offset cancellation techniques, which reduce the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. This device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a open-drain output able to sink up to 25 mA. An on-board regulator permits operation with supply voltages of 3.8 to 24 V . The A1160 is provided in a 5-pin SOT23W. The package is lead (Pb) free, with 100% matte tin leadframe plating. Description (continued) Selection Guide Part Number Packing* A1160LLHLX-T 10,000 pieces per 13-in. reel *Contact Allegro™ for additional packing options.

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 3Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. OPERATING CHARACTERISTICS Valid across full operating voltage and ambient temperature ranges; unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. 1 Max. Unit 2

Electrical Characteristics

Operating, TJ < 165°C 3.8 – 24 V VCC required for diagnostic functionality 3.8 – 24 V Output Leakage Current I OUTOFF VOUT = 24 V, B < BRP –– 1 0 μA Output Saturation Voltage V OUT(SAT) IOUT = 20 mA, B > BOP – 185 400 mV Output Current Limit I OM B > BOP 30 – 60 mA Power-On Time3 tPN VCC > 3.8 V , B < BRP(min) – 10 G , B > BOP(max) + 10 G –– 2 5 μs Chopping Frequency f C – 400 – kHz Output Rise Time3,4 t r RLOAD = 820 Ω, CL = 20 pF – 0.2 2 μs Output Fall Time3,4 tf RLOAD = 820 Ω, CL = 20 pF – 0.1 2 μs Supply Current5 ICC(ON) B < BRP , VCC = 12 V – – 5 mA ICC(OFF) B > BOP , VCC = 12 V – – 5 mA ICC(DIAG) VCC = 12 V, DIAG = 1 – 16 25 mA Reverse Battery Current I RCC VRCC = –18 V – – –10 mA Supply Zener Clamp Voltage V ZSUP I CC = 8 mA, TA = 25°C 30 – – V Output Zener Voltage V ZOUT IOUT = 3 mA, TA = 25°C 28 – – V PWM Carrier Frequency f PWMout With Diagnostic mode enabled – 3 – kHz Diagnostic Characteristics Duty Cycle (Diagnostic Mode)6 DFAIL DIAG = 1, device malfunction – ≈ 0 or ≈ 100 –% DPASS DIAG = 1, device normal 40 50 60 % DIAG Pin Input Resistance R DIAG Internal pulldown resistor – 1 – M Ω DIAG Pin Input Low Voltage Threshold VIL Device in Normal mode – – 0.6 V DIAG Pin Input High Voltage Threshold VIH Device in Diagnostic mode 1.5 – 5.0 V Diagnostic Enable Time t D Time from VIH reaching 1.5 to 5.0 V until valid diagnostic output 1–– m s Diagnostic Disable Time t DIS Time from DIAG pin release (high to low transition) until valid normal sensor IC output –– 2 5 μs Continued on the next page…

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 4Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. OPERATING CHARACTERISTICS (continued) Valid across full operating voltage and ambient temperature ranges; unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. 1 Max. Unit 2 Magnetic Characteristics7 Operate Point B OP 115 180 245 G Release Point B RP 60 125 190 G Hysteresis B HYS BOP – BRP 30 55 80 G Maximum External Field in Diagnostic Mode8 BEXT(DIAG) 800 10,000 – G Drift Detection Threshold Operate Point Drift B OP(DRIFT) 30 – 420 G Release Point Drift B RP(DRIFT) 15 – 325 G 1Typical data is at TA = 25°C and VCC = 12 V and it is for design information only. 21 G (gauss) = 0.1 mT (millitesla). 3Power-On Time, Output Rise Time, and Output Fall Time are ensured through device characterization and not final test. 4CL = oscilloscope probe capacitance. 5In Diagnostic mode the supply current level is different from the Normal mode operation current level. This is important when determining the power derating for Diagnostic mode. 6When the A1160 passes the diagnostic tests, it outputs a 50% duty cycle signal. Any other output indicates the test failed. Please see the Diagnostic Mode of Operation section for more information. 7Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for south-polarity magnetic fields. 8800 G is the maximum test capability due to practical equipment limitations. Design simulations show that a 10,000 G external field will not adversely affect the A1160 in Diagnostic mode when a 1% sensitivity mismatch between the Hall elements in the IC is assumed.

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 5Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. 20 40 60 80 100 120 140 160 180 Temperature (ºC) Maximum Allowable VCC (V) Power Derating Curve VCC(max) Normal Mode (ICC(max) = 5 mA) Diagnostic Mode (ICC(max) = 25 mA) VCC(min) 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 20 40 60 80 100 120 140 160 180 Temperature (°C) Power Dissipation, PD (mW) Power Dissipation versus Ambient Temperature Diagnostic Mode (ICC(max) = 25 mA) Normal Mode (ICC(max) = 5 mA) Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Unit Package Thermal Resistance RθJA On 4-layer PCB based on JEDEC standard 124 ºC/W *Additional thermal information available on the Allegro website

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 6Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Characteristic Performance 0 5 10 15 20 25 30 Supply Current, I CC(DIAG) (mA) Supply Voltage, VCC (V) ICC(DIAG) vs. VCC -40°C 25°C 150°C TA -50 0 50 100 150 200 Supply Current, I CC(DIAG) (mA) Ambient Temperature, T A (°C) ICC(DIAG) vs. TA 3.8 V VCC 12 V 24 V 0 5 10 15 20 25 30 Supply Current, I CC(OFF) (mA) Supply Voltage, VCC (V) ICC(OFF) vs. VCC 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40°C 25°C 150°C TA -50 0 50 100 150 200 Supply Current, I CC(OFF) (mA) Ambient Temperature, T A (°C) ICC(OFF) vs. TA 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 3.8 V VCC 12 V 24 V 0 5 10 15 20 25 30 Supply Current, I CC(ON) (mA) Supply Voltage, VCC (V) ICC(ON) vs. VCC 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40°C 25°C 150°C TA 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -50 0 50 100 150 200 Supply Current, I CC(ON) (mA) Ambient Temperature, T A (°C) ICC(ON) vs. TA 3.8 V VCC 12 V 24 V 100 150 200 250 300 350 400 0 5 10 15 20 25 30 Output SaturaƟon Voltage, V OUT(SAT) (V) Supply Voltage, VCC (V) VOUT(SAT) vs. VCC -40°C 25°C 150°C TA 100 150 200 250 300 350 400 -50 0 50 100 150 200 Output SaturaƟon Voltage, V OUT(SAT) (V) Ambient Temperature, T A (°C) VOUT(SAT) vs. TA 3.8 V VCC 12 V 24 V

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 7Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. 0 5 10 15 20 25 30 Normal DIAG Duty Cycle, D PASS (%) Supply Voltage, VCC (V) DPASS vs. VCC -40°C 25°C 150°C TA -50 0 50 100 150 200 Normal DIAG Duty Cycle, D PASS (%) Ambient Temperature, T A (°C) DPASS vs. TA 3.8 V VCC 12 V 24 V 0 5 10 15 20 25 30 PWM Carrier Frequency, f PWMout (kHz) Supply Voltage, VCC (V) fPWMout vs. VCC -40°C 25°C 150°C TA -50 0 50 100 150 200 PWM Carrier Frequency, f PWMout (kHz) Ambient Temperature, T A (°C) fPWMout vs. TA 3.8 V VCC 12 V 24 V

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 8Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. 0 5 10 15 20 25 30 MagneƟc Hysteresis, B HYS (G) Supply Voltage, VCC (V) BHYS vs. VCC -40°C 25°C 150°C TA -50 0 50 100 150 200 MagneƟc Hysteresis, B HYS (G) Ambient Temperature, T A (°C) BHYS vs. TA 3.8 V VCC 12 V 24 V 115 135 155 175 195 0 5 10 15 20 25 30 MagneƟc Release Point, B RP (G) Supply Voltage, VCC (V) BRP vs. VCC -40°C 25°C 150°C TA 115 135 155 175 195 -50 0 50 100 150 200 MagneƟc Release Point, B RP (G) Ambient Temperature, T A (°C) BRP vs. TA 3.8 V VCC 12 V 24 V 110 130 150 170 190 210 230 250 0 5 10 15 20 25 30 MagneƟc Operate Point, B OP (G) Supply Voltage, VCC (V) BOP vs. VCC -40°C 25°C 150°C TA 110 130 150 170 190 210 230 250 -50 0 50 100 150 200 MagneƟc Operate Point, B OP (G) Ambient Temperature, T A (°C) BOP vs. TA 3.8 V VCC 12 V 24 V

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 9Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Functional Description Figure 1. Switching behavior of Hall effect switches. On the horizontal strength (including the case of increasing north polarity). Figure 2. Typical application circuit goes high (turns off). This is illustrated in figure 1. nal mechanical vibration and electrical noise. the first excursion beyond BOP or BRP .

Applications

It is strongly recommended that an external bypass capacitor be connected between the supply and ground of the A1160 (in close proximity to the device) to reduce both external noise and noise generated by the chopper stabilization technique. As is shown in figure 2, a 0.1 μF capacitor is typical. Extensive applications information on magnets and Hall-effect sensor ICs is available on the Allegro website, including the fol- lowing application notes:

  • Hall-Effect IC Applications Guide, AN27701
  • Soldering Methods for Allegro’ s Products – SMT and Through- Hole, AN26009 BOP BRP BHYS VCC VOUT VOUT(SAT) Switch to Low Switch to High B+0 CBYPASS VCC A1160 VOUT GND CL (Optional) Output DIAG From Controller RL

Worcester, Massachusetts 01615-0036 U.S.A. internally generated magnetic signal to exercise the signal path. figure 3. If the diagnostic signal is above the upper reference or that is either at nearly 0% or at nearly 100% duty cycle. nearly 0% or at nearly 100% duty cycle. Figure 3. Diagnostics Functional Diagram. When the A1160 passes the diagnostic test, a 50% duty cycle signal is mode is only active when the DIAG input pin is pulled high.

Worcester, Massachusetts 01615-0036 U.S.A. to the offset that can be produced at the output of the Hall IC. of the output drift induced by thermal and mechanical stresses. Allegro sales representative. Figure 4. Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 12Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. SEATING PLANE C

0.55 REF

0.25 BSC

0.95 BSC

0.95 1.00 0.70

0.20 MIN

2.40 A Active Area Depth, 0.28 mm REF B C C B Reference land pattern layout All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Branding scale and appearance at supplier discretion A PCB Layout Reference View Standard Branding Reference View Branded Face N = Last three digits of device part number NNN 2.90 +0.10 –0.20 4°±4° 8X 12° REF 0.18 +0.02 –0.05 0.05 +0.10 –0.05

0.25 MIN

1.91 +0.19 –0.06 2.98 +0.12 –0.08 1.00 ±0.13 0.40 ±0.10 For Reference Only; not for tooling use Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown D Hall element, not to scale, location application dependant D

Chopper-Stabilized Precision Hall Effect Switch With Advanced DiagnosticsA1160 13Allegro MicroSystems, LLC Worcester, Massachusetts 01615-0036 U.S.A. Copyright ©2013, Allegro MicroSystems, LLC Allegro MicroSystems, LLC reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to permit improvements in the per for mance, 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 in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, LLC assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com