ADT002-10E TR

ADT001/ADT002 Rotation Sensors ADT00X-10E Ultralow Power Rotation Sensors Features Tunneling Magnetoresistance (TMR) technology Extremely low power (1.8 μA typ. at 2.4 V) Precision digital quadrant outputs Wide airgap tolerance Operates with as little as 30 Oersteds of magnetic field Integrated fault detection 2.4 V to 5.5 V supply range −40°C to +125°C operating range Ultraminiature TDFN6 packages • • • • • • • • • Applications Water meters Rotational speed sensors Rotational position sensors • • • Functional Diagram and Pinout Ro Angular Sensor ion tat Vdd Description The ADT001 and ADT002 rotation sensors are ultralow power, digital-output magnetic rotation sensors. Tunneling Magnetoresistance (TMR) technology allows small size and low power, making the sensors ideal for battery operation. GND Cos Sin Fault Sensor FAULT The sensors have two digital, binary outputs. The two outputs are 90 degrees out of phase to provide directional information. N/C (for test only) An additional output indicates a fault if the magnetic field is too high for accurate measurements. The ADT001 is optimized for edge-sensitive applications and the ADT002 for absolute position. The ADT001 has high hysteresis for noise immunity in applications such as speed sensing and counting rotations. The ADT002 is low hysteresis to provide accurate, absolute rotational quadrant information. Truth Table Angle 0 -90 90 -180 180 -270 270 -360 Output Sin Cos H H H L L L L H The parts are packaged in NVE’s 2.5 mm x 2.5 mm x 0.8 mm TDFN6 surface-mount package. 1 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Absolute Maximum Ratings Parameter Supply Voltage Storage Temperature ESD (Human Body Model) Applied Magnetic Field Min. −0.5 −40 Max. 7 170 2000 Unlimited Units Volts °C Volts Oe Operating Specifications Parameter Operating Temperature Supply Voltage Supply Current Applied Magnetic Field Strength Tmin to Tmax; 2.4 V < VDD < 5.5 V unless otherwise stated. Symbol Min. Typ. Max. Tmin; Tmax −40 125 VDD 2.4 5.5 0.55 1.8 3.1 2.2 IDDQ 0.8 2.7 4.6 6.95 30 200 Fault Output Field Strength Threshold Low-Level Output Voltage High-Level Output Voltage Angular Precision/Repeatability Angular Hysteresis ADT001 ADT002 Frequency Response 200 VOL VOH 0 VDD − 0.25 | θH − θL | 12 3 2 fMAX 300 20 4 Units °C V μA Test Condition VDD = 2.4V VDD = 3V 3V < VDD < 3.6V VDD = 5.5V Oe 500 Oe 0.24 VDD ±1.5 V V deg. 28 6 deg. Pin 4 not connected; field in any direction IL = −50 μA IL = 50 μA VDD = 3.6V; 25°C kHz 2 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Operation Overview The heart of the unique sensor is an array of four Tunneling Magnetoresistance (TMR) elements, one in each quadrant. TMR technology enables low power and miniaturization, making the sensors ideal for battery operation. In a typical configuration, an external magnet provides a saturating magnetic field (30 to 200 Oe) in the plane of the sensor, as illustrated below for a bar magnet and a radially-magnetized disk magnet: Figure 1. Sensor operation. Outputs Simple output encoding The rotation is encoded in two quadrature outputs, 90 degrees out of phase. Mathematically, the outputs correspond to the sign of the sine and cosine of the rotation, i.e., sgn(sinθ) and sgn(cosθ), as shown below: Cos 0 Sin 90˚ 180˚ 270˚ Rotation (CCW) 360˚ Figure 2. Sensor outputs (counterclockwise rotation viewed from the top of the sensor). Thus the binary sensor outputs define the quadrant of rotation: Figure 3. Sensor outputs for each rotation quadrant. 3 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Wide range of magnets and magnet location The sensor operates with as little as a 30 Oe magnetic field, and is accurate up to 200 Oe. This wide magnetic field range allows inexpensive magnets and operation over a wide range of magnet spacing. Larger or stronger magnets require more distance to avoid oversaturating the sensor; smaller or weaker magnets may require closer spacing. Low-cost, radially-magnetized ferrite disk magnets can be used with these sensors. Bar magnets can also be used in some configurations. When locating the magnet in relation to the sensor, note that the rotational center of the sensor is offset slightly from the package center (see Figure 11). Absolute position Unlike some encoder types, ADT001/ADT002 sensors detect absolute position and maintain position information when the power is removed. The sensor immediately powers up indicating the correct position. Power supply decoupling and noise filtering Since ADT00X sensor s are duty-cycled to reduce power consumption, a bypass capacitor should be used on VDD if the sensor is powered by a power supply or a battery with long connections. 10 nF ceramic capacitors are typical. Because the sensor uses high-impedance circuitry and often operates in noisy environments, designers should consider filtering or debounce circuitry on the sensor outputs if possible, especially if the application relies on triggering or counting edges. Integrated fault detection An additional output indicates a fault if the magnetic field is too high for accurate measurements. This can occur if the magnet is too close to the sensor, or due to interference from adjacent magnets. The signal can also be used to align assemblies. The signal is intended for gross sensing since the exact threshold depends on the particular device, field orientation, and supply voltage, and can vary over temperature. The fault detection threshold can be adjusted with an external resistor from pin 4 to ground, which increases the fault detection threshold field as shown in Figure 4: Vdd 1 GND 6 Sin 2 Cos 5 Fault Threshold Adjust FAULT 3 4 ADT00X-10E R Figure 4. Fault threshold adjustment test circuit. The typical effect of the external resistor value is shown in Figure 7. 4 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Typical Performance Graphs Quiescent Supply Current ( A) 5 4 3 2 1 0 2 2.5 3 3.5 4 Supply Voltage 4.5 5 5.5 5 5.5 Figure 5. Typical Quiescent Supply Current (25°C). Angular Hysteresis (degrees) 40 125 C 85 C 30 25 C -40 C 20 10 0 2 2.5 3 3.5 4 4.5 Supply Voltage Figure 6. Typical Angular Hysteresis vs. Supply Voltage (25°C). Typical Fault Threshold (Oe) 600 500 400 300 200 100 0 0.5 1 2 4 R (M ) Figure 7. Typical fault threshold vs. external threshold adjust resistor (Fig. 4 test circuit). 5 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Angular Hysteresis (degrees) 40 125 C 85 C 30 25 C -40 C 20 10 0 2 2.5 3 3.5 4 4.5 5 5.5 Supply Voltage Figure 8. Typical angluar hysteresis vs. supply voltage at various temperatures (ADT001). 40 Angular Hysteresis (degrees) VDD = 2.4V 30 VDD = 3.6V 20 10 VDD = 5.5V 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature ( C) Figure 9. Typical hysteresis vs. temperature at various supply voltages (ADT001). 6 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Illustrative Application Circuits Quadrant detection A 2-to-4 Line Decoder can provide digital signals indicating the quadrant of rotation: 2.4-5.5V Vdd 1 GND 6 Sin 2 Cos 5 3 A Y3 Y2 Y1 B Y0 4 0˚- 90˚ 90˚- 180˚ 270˚- 360˚ 180˚- 270˚ 74LVC 1G139 ADT002-10E Rotation Sensor Figure 10. Quadrant detection. Direction detection A “D” flip-flop can be used to create a direction output by detecting the phasing between the two outputs. In the circuit below, the direction signal is updated as the Sin output goes from low-to-high, which is at zero degrees for counterclockwise rotation and 180 degrees for clockwise rotation. The resistor and capacitor enhance noise immunity for harsh environments. The ADT001 is particularly well-suited for this type of application because its high hysteresis ensures clean transitions with no possibility of false triggering on the high-to-low transition to the flip-flop clock. 2.4-5.5V Vdd 1 GND 6 Sin 2 Cos 5 D Q Direction (H=CCW) 3 4 10 nF ADT001-10E Rotation Sensor 100K CLK 74LVC 1G79 Figure 11. Direction detection. 7 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors A two-cycle/revolution signal An Exclusive-OR gate can be used to provide a digital signal with two cycles per revolution and transitions every 90 degrees: 2.4-5.5V Vdd 1 GND 6 Sin 2 Cos 5 Q 3 4 2/rev. 74LVC 1G86 ADT001-10E Rotation Sensor Figure 12. Two-cycle per revolution signal. Ultralow power external circuitry Any of the application circuits described in this section can use 74AUP-series logic instead of 74LVC circuitry if lower power is required and five-volt operation is not needed. 8 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Ro 1 Angular Sensor Sin ion tat Vdd 0.90 Pinout 2 6 GND 5 Cos 4 N/C (for test only) 1.25 FAULT Fault Sensor 3 Figure 13. ADT00X-10E pinout and center of rotation. Pin 1 2 Symbol VDD Sin Description Supply voltage (2.4 V to 5.5 V). HIGH CMOS output when the sine of the rotation angle is positive (0 − 180°). HIGH CMOS output indicates excess magnetic field and possible unreliable measurement. 3 FAULT 4 Fault Threshold Adjust 5 Cos 6 GND Connection for an optional external resistor to GND to increase the fault detection threshold field for the FAULT output. HIGH CMOS output when the cosine of the rotation angle is positive (0 − 90° or 270° − 360°). Ground. Notes: • The package center pad may be left floating or connected to ground. • This product has been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE recommends that all integrated circuits be handled with appropriate care to avoid damage. Damage caused by inappropriate handling or storage could range from performance degradation to complete failure. Available Parts Part No. ADT001-10E ADT002-10E Package TDFN6 TDFN6 Marking FDXe FDYe Description High hysteresis, ultralow-power rotation sensor Low hysteresis, ultralow-power rotation sensor 9 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors 2.5 mm x 2.5 mm TDFN6 Package 2.00 ± 0.05 0.80 MAX. 6 4 6 2.50±0.10 1.30±0.05 4 C0.10 PIN 1 ID 1 1 3 3 0.30±0.05 (6X) 2.50 ± 0.10 0.0-0.05 0.30±0.05 0.65 TYP. (4X) 1.30 REF (2X) 0.20 REF RoHS Notes: • Dimensions in millimeters. • Soldering profile per JEDEC J-STD-020C, MSL 1. COMPLIANT 10 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Revision History SB-00-048-B April 2017 Change • Tightened supply current spec. based on more test data. • Clarified repeatability vs. accuracy (p. 2). • Added performance graphs of angular hysteresis vs. temperature and supply voltage. SB-00-048-A Sept. 2016 Change • Initial release. SB-00-048-PRELIM May 2016 Change • Preliminary release. 11 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation ADT001/ADT002 Rotation Sensors Datasheet Limitations The information and data provided in datasheets shall define the specification of the product as agreed between NVE and its customer, unless NVE and customer have explicitly agreed otherwise in writing. All specifications are based on NVE test protocols. 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Right to Make Changes NVE reserves the right to make changes to information published in this document including, without limitation, specifications and product descriptions at any time and without notice. This document supersedes and replaces all information supplied prior to its publication. Use in Life-Critical or Safety-Critical Applications Unless NVE and a customer explicitly agree otherwise in writing, NVE products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical devices or equipment. NVE accepts no liability for inclusion or use of NVE products in such applications and such inclusion or use is at the customer’s own risk. Should the customer use NVE products for such application whether authorized by NVE or not, the customer shall indemnify and hold NVE harmless against all claims and damages. Applications Applications described in this datasheet are illustrative only. 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Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. SB-00-048_ADT00X-10E_RevB Jan. 2019 13 NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 Fax: (952) 829-9189 www.nve.com ©NVE Corporation