A31010 ALLEGRO

Document overview

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Technical content

DESCRIPTION

The A31010 family of linear Hall-effect sensor ICs provides a voltage output that is proportional to the applied magnetic field. The user-controlled sleep pin and rapid wakeup time allows the A31010 to consume minimal power and provide magnetic data quickly after waking up. These features coupled with a low supply voltage rating of 2.5 V and non-ratiometric output make this IC ideal for battery-powered applications. Many human machine interface (HMI) applications such as gaming controller joysticks, triggers, and keyboards will benefit from the sensor’s unidirectional output. These devices are available in a small 2 mm × 3 mm, 0.75 mm nominal height micro-leaded package (MLP/DFN). It is lead (Pb) free with 100% matte tin leadframe plating. A31010-DS, Rev. 1 MCO-0001190 FEATURES AND BENEFITS ▪ User-controlled sleep mode with fast (< 60 µs) wakeup time for lag-free power savings

  • 3.2 mA active and 25 µA sleep current reduces total power consumption and extends battery life
  • Operates down to 2.5 V supply for battery applications
  • Low quiescent voltage output (QVO) maximizes output range and resolution at ADC input
  • Ambient temperature range from –20°C to 85°C suited for personal electronics and gaming applications Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm Footprint PACKAGE : 6-pin MLP/DFN (suffix EH) Figure 1: Functional Block Diagram Not to scale A31010 Amp Out VCC OUT GND Filter Dynamic Offset Cancellation Gain Offset Hall Element Regulator Programming Logic Circuit Reference Current To all subcircuits RRatio / 2 RRatio / 2 VREF SLEEP February 17, 2022

APPLICATIONS

  • Game controllers
  • Joysticks
  • Triggers
  • Personal electronics
  • Keyboards
  • Virtual and augmented reality devices
  • Human-machine interfaces

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com TERMINAL LIST TABLE Pin Name Function

1 VCC Supply

2 OUT Output

3 GND Ground

4 GND Ground

6 VREF Supply for ratiometric reference

ABSOLUTE MAXIMUM RATINGS* Characteristic Symbol Notes Rating Unit Supply Voltage VCC 7 V Reverse Supply Voltage VRCC –0.1 V Reference Voltage VREF 7 V Reverse Reference Voltage VRREF –0.1 V Logic Supply Voltage VSLEEP VCC > 2.5 V 32 V Output Voltage VOUT VCC + 0.1 V Reverse Output Voltage VROUT –0.1 V Operating Ambient Temperature TA Range S –20 to 85 °C Junction Temperature TJ(MAX) 165 °C Storage Temperature Tstg –65 to 170 °C *All ratings with reference to ground SELECTION GUIDE Part Number Typical Sensitivity (mV / G) [1] QVO (%VREF) Output Polarity Full Scale Field (G) [1] Package Packing [2] A31010SEHALT-4 3.78 6.47 Unidirectional +650 DFN/MLP 2 mm × 3 mm; 0.75 mm nominal height 7-in. reel, 3000 pieces/reelA31010SEHALT-10 10.0 6.47 Unidirectional +250 [1] At VCC = VREF = 3.0 V [2] Contact Allegro for other packing options. 3 4 VCC OUT GND VREF GND SLEEP PINOUT DIAGRAM

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com COMMON ELECTRICAL CHARACTERISTICS: Valid at TA = 25°C, VCC = 3.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage VCC 2.5 3.0 3.5 V Supply Current ICC Active Mode – 3.2 3.6 mA Sleep Current ICCS Sleep Mode – 25 – µA Supply Zener Clamp Voltage VCCZ ICC = 7 mA 6 8.3 – V Supply Bypass Capacitor CVCC Optional – 100 – nF Output Capacitive Load CL – – 10 nF Output Resistive Load RL 15 – – kΩ Ratiometric Reference Voltage VREF 2.5 – VCC V Ratiometric Reference Zener Clamp Voltage VREFZ IVREF = 3 mA 6 8.3 – V Ratiometric Reference Input Resistance RREF VSLEEP > VSH, VCC = VCC(TYP) 200 – – kΩ VSLEEP < VSL, VCC = VCC(TYP) – 5 – MΩ SLEEP Input Voltage Range VSLEEP –0.1 – VCC + 0.5 V Power-On Time tPO VCC > VCC(MIN), VSLEEP > VSH, VCC slew rate = 1 V/µs, CL ≤ 10 nF, RL ≥ 15 kΩ – 40 60 µs Internal Bandwidth BW Small signal –3 dB; CL ≤ CL(MAX) – 10 – kHz Response Time tR – 35 – µs Propagation Delay Time tP – 5 – µs Rise Time tRISE – 10 – µs Noise Density BND VCC = 3.0 V Input Referred, TA = 25°C – 2.5 – mG/√(Hz) Noise BN VCC = 3.0 V Input Referred, TA = 25°C – 0.3 – GRMS Linearity Sensitivity Error ELIN Through Optimized Sensing Range (BR) – 1 – % Output Saturation Voltage VSATH VREF ≤ VCC – VCC – 0.1 – V VSATL VREF ≤ VCC – 0.1 – V Sensitivity Ratiometry Error ESENSR – 0 – % QVO Ratiometry Error EQVOR – 0 – mV

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com A31010SEHALT-4 PERFORMANCE CHARACTERISTICS: Valid at TA = 25°C, VCC = VREF = 3.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Optimized Sensing Range [1] BR 0 – 650 G Sensitivity Sens – 3.78 – mV/G Quiescent Output Voltage QVO BIN = 0 G – 6.47 – %VREF [1] Parameter not measured at final test. Determined by design and characterization. SLEEP MODE CHARACTERISTICS: Valid at TA = 25°C, VCC = 3.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units SLEEP Input Thresholds [1] VSH VSLEEP > VSH = Active Mode – 0.45 × VCC – V VSL VSLEEP < VSL = Sleep Mode – 0.2 × VCC – V SLEEP Input Current ISLEEP VSLEEP < VSL = Sleep Mode – 10 – nA SLEEP Wakeup Time [2] tWU VSLEEP > VSH, VCC > VCC(MIN), CL ≤ 10 nF, RL ≥ 15 kΩ – 40 60 µs SLEEP Power Off Time [3] tSLEEP VSLEEP < VSL, VCC > VCC(MIN), CL ≤ 10 nF, RL ≥ 15 kΩ – 1 – µs [1] Sleep mode is active low. When SLEEP pin is pulled below VSL, the device will enter sleep mode and not respond to magnetic input. [2] Includes sensor’s response time. Device’s output will be stable within tWU(MAX) after VSLEEP > VSH. [3] SLEEP Power Off Time is the time between when VSLEEP < VSL and ICC < 100 μA. A31010SEHALT-10 PERFORMANCE CHARACTERISTICS: Valid at TA = 25°C, VCC = VREF = 3.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Optimized Sensing Range [1] BR 0 – 250 G Sensitivity Sens – 10 – mV/G Quiescent Output Voltage QVO BIN = 0 G – 6.47 – %VREF [1] Parameter not measured at final test. Determined by design and characterization.

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 2: Example Application Circuit. VSLEEP may be controlled by a microprocessor I/O pin.

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com

APPLICATION INFORMATION

The A31010 is a low-power Hall-effect sensor IC that is perfect for power-sensitive customer applications. The current consump- tion of these devices is typically 3.2 mA, while the device is in active mode and less than 25 μA when the device is in sleep mode. Toggling the logic-level signal connected to the SLEEP pin drives the device into either active mode or sleep mode. A logic-low sleep signal drives the device into sleep mode, and a logic-high sleep signal drives the device into active mode. In cases when the VREF pin is powered before the VCC pin, the device will not operate within the specified limits until the sup- ply voltage is equal to the reference voltage. When the device is switched from sleep mode to active mode, a time defined by tWU must elapse before the output of the device is valid. The device output transitions into the high-impedance state approximately tSLEEP seconds after a logic-low signal is applied to the SLEEP pin (see Figure 3). If possible, it is recommended to power-up the device in sleep mode. However, if the application requires that the device be powered-on in active mode, then a 10 kΩ resistor in series with the SLEEP pin is recommended. This resistor will limit the current that flows into the SLEEP pin if certain semiconductor junctions become forward-biased before the ramp-up of voltage on the VCC pin. Note that this current-limiting resistor is not required if the user connects the SLEEP pin directly to the VCC pin. The same precautions are advised if the device supply is powered-off while power is still applied to the SLEEP pin. Figure 3: A31010 Timing Diagram HIGH IMPEDANCE HIGH IMPEDANCE HIGH IMPEDANCE VCC VSLEEP ICC BIN VOUT VCC VSL VSH ICCS ICC QVO VOUT(B1) tSLEEP tWU tSLEEP tWU

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CHARACTERISTIC DEFINITIONS Ratiometry A31010 devices feature a ratiometric output. The quiescent voltage output and sensitivity are proportional to the ratiometric supply reference voltage input at the VREF pin. The percent ratiometric change in the quiescent voltage output is defined as: Equation 1: ∆QVO(∆VREF) = × 100%VREF ÷ 3 V QVO(VREF) ÷ QVO(3V) And the error is defined as: Equation 2: EQVOR = ∆QVO(∆VREF) – 100% The percent ratiometric change in the sensitivity is defined as: Equation 3: ∆Sens(∆VREF) = × 100%VREF ÷ 3 V Sens(VREF) ÷ Sens(3V) And the error is defined as: Equation 4: ESENSR = ∆Sens(∆VREF) – 100% Linearity The on-chip output stage is designed to provide a linear output with the maximum supply voltage of VCCN. Although applica- tions with very high magnetic fields will not damage these devices, it will force the output into a non-linear region. Linear- ity is measured and defined as: Equation 5: Lin = ×100% 2 × (VOUT(B/2)) – QVO VOUT(B) – QVO And the error is defined as: Equation 6: ELIN = Lin – 100%

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com THERMAL CHARACTERISTICS: May require derating at maximum conditions Characteristic Symbol Test Conditions Min. Units Package Thermal Resistance RθJA 1-layer PCB with copper limited to solder pads 221 °C/W 2-layer PCB with 0.6 in.2 of copper area each side, connected by thermal vias 70 °C/W 4-layer PCB based on JEDEC standard 50 °C/W 500 1000 1500 2000 2500 3000 3500 4000 4500 20 40 60 80 100 120 140 160 180 Temperature (°C) Power Dissipation, PD (mW) Power Dissipation versus Ambient Temperature (RθJA = 70 ºC/W) 2-layer PCB (RθJA = 50 ºC/W) 4-layer PCB (RθJA = 221 ºC/W) 1-layer PCB

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 4: Package EH, 6-pin MLP/DFN C0.08 7X C SEATING PLANE E C F D A 1.00 3.70 1.25 0.50 0.95 0.30

2.00 BSC

3.00 BSC

0.75 ±0.05 1.224 ±0.050 1.042 +0.100 –0.150 0.25 ±0.05

0.5 BSC

0.55 ±0.10 PCB Layout Reference View B Standard Branding Reference View YWW LLL NN YWW = Date Code LLL = Lot Number NN = Last two digits of part number (10) For Reference Only–Not for T ooling Use (Reference Allegro DWG-0000373) Dimensions in millimeters – NOT TO SCALE Exact case and lead configuration at supplier discretion within limits shown Branding scale and appearance at supplier discretion A D B C E F Terminal #1 mark area Exposed thermal pad (reference only, terminal #1 identifier appearance at supplier discretion) 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; when mounting on a multilayer PCB, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference EIA/JEDEC Standard JESD51-5) Coplanarity includes exposed thermal pad and terminals Active Area Depth, 0.32 mm NOM C0.15 ×2 C0.15 ×2 G G1.50 G 1.00 G Hall Element (not to scale); U.S. customary dimensions controlling PACKAGE OUTLINE DRAWING

Low-Power Unidirectional Linear Hall-Effect Sensor IC with User-Controlled Sleep Feature in Compact 2 mm × 3 mm FootprintA31010 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

– September 2, 2021 Initial release

1 February 17, 2022 Updated product offerings

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