AD-Series GMR Switch™ Precision Digital Magnetic Sensors Features • Digital outputs • Precision magnetic operate points from 10 – 80 Oe • 4.5 V – 30 V supply voltage • 20 mA output drive • Temperature and voltage stability • Models available with short-circuit protection • Frequency response to 100 kHz • Ultraminiature TDFN6 and MSOP8 packages ShortCircuit Protection (optional) Voltage Regulator (optional) Output Driver Applications • Motion, speed, and position control • Pneumatic cylinder position sensing • Speed sensing Description AD-Series GMR Switches are the industry standard for sensitivity and precision. Idealized Transfer Function GMR Switches integrate GMR sensor elements with digital signal processing electronics. These sensors are more precise than other magnetic sensors, and magnetic field operate points are stable over voltage and temperature extremes. AD-Series models available in a wide variety of magnetic operate points and output configurations. Versions are available with short-circuit protection circuitry and with integrated voltage regulators. 11409 Valley View Road, Eden Prairie, MN 55344-3617

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AD-Series GMR Switches Operation Typical connections with an external pull-up resistor are shown below: 10V Vcc Figure 1. Typical connections. Applied Field (Oe) Figure 2a. Typical output vs. magnetic field (AD024 with a 10V supply and 1 KΩ pull-up resistor). Figure 2b. Typical output vs. magnetic field (ADH025 with a 10V supply and 1 KΩ pull-up resistor). ON / OFF Behavior AD-Series sensor outputs turn ON when the field exceeds the magnetic operate point, and OFF when the field drops below the operate point minus the release differential. External Pull-Up Resistors Outputs are open collector,...

AD-Series GMR Switches In-Plane Magnetic Sensitivity As the field varies in intensity, the digital output will turn on and off. Unlike Hall-effect or other sensors, the direction of sensitivity is in the plane of the package. The diagrams below show two permanent magnet orientations that will activate the sensor in the direction of sensitivity: Figure 3. Planar magnetic sensitivity. Standard and Cross-Axis Sensitivity Standard AD-Series sensors are sensitive along the part axis as shown in Figure 4b, but a number of versions are available with cross-axis sensitivity (see Figure 4a). Figure 4a....

AD-Series GMR Switches Illustrative Application Circuits Integrated Short-Circuit Protection AD8xx and AD9xx models include integrated Short Circuit Protection (“SCP”) circuitry. A detailed block diagram of such a device is shown below: AD924-00 C2 Vreg a. Comparator b. SCP Turn-On Delay Timer c. Off-State Timer Figure 5. Detailed block-diagram of the AD924 sensor with short-circuit protection circuitry. Typical SCP external circuitry for sourcing and sinking SCP versions are shown in the following schematics: Vcc Figure 6. Short-circuit protection circuitry (sourcing output). 11409 Valley View...

Figure 7. Short-circuit protection circuitry (sinking output). If the voltage across RSHORT exceeds 145 mV (typical), the SCP circuitry is activated. An RSHORT of 0.47Ω then results in a protection threshold of approximately 300 mA. Capacitor C2 delays the shutdown so normal startup transients do not trigger the circuitry; a 0.001 μF capacitor can be used for a typical 35 μs delay (t1). C1 sets the SCP “OFF” time (t2), which is typically 0.01 μF for 15 ms OFF time. The short-circuit output current using these typical component values is shown below: 400 300 200 100 0 t2 =35 s Figure 8. AD821...

a. Comparator b. SCP Turn-On Delay Timer c. Off-State Timer Ground a. Voltage Regulator b. Amplifier c. Thermal Shutdown Figure 9. A GMR Switch with an external power switch IC for a high-power output, bullet-proof system. 11409 Valley View Road, Eden Prairie, MN 55344-3617 ©NVE Corporation

AD-Series GMR Switches Typical Performance Graphs 50 40 O 30 .92 Supply Voltage Figure 10. Typical Operate Points (OP) and Release Points (RP) vs. supply voltage (25°C). Temperature (°C) Figure 11. Typical Operate Points (OP) and Release Points (RP) vs. temperature. Figure 13. Output current vs. supply voltage. NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 [email protected] www.nve.com ©NVE Corporation Competitive sensor & power supply solutions worldwide

AD-Series GMR Switches Part Numbering AD 0 21 - 00E Operating Field 04 = 20 Oe; Standard Direction 05 = 40 Oe; Standard Direction 06 = 80 Oe; Standard Direction 20 = 28 Oe; Standard Direction 21 = 20 Oe; Cross-Axis Sensitivity 22 = 40 Oe; Cross-Axis Sensitivity 24 = 28 Oe; Cross-Axis Sensitivity 25 = 10 Oe; Cross-Axis Sensitivity Package Type 00 = MSOP8 10 = TDFN6 E = RoHS Base Part Outputs AD = Standard 0 = Sinkl digital switches 1 = Source 2 = Sink1 + Source 3 = Sink1 + Sink2 4 = Sink + Regulated Output 5 = Source + Regulated Output 6 = Sink + Source + Regulated Output 7 = Two Sinks...

Operating Point Chart Magnetic Operate Point (Oe) Stock Parts NVE Corporation 11409 Valley View Road, Eden Prairie, MN 55344-3617 Phone: (952) 829-9217 [email protected] www.nve.com ©NVE Corporation Competitive sensor & power supply solutions worldwide

AD-Series GMR Switches Evaluation Kits Two inexpensive evaluation kits including AD-Series GMR switches are available: AG910-07/AG911-07—GMR Switch Evaluation Kits Several GMR Switches with different magnetic operate points and different output options such as current sink and current source. Magnets and circuit boards for mounting the parts are also included. The AG910-07 kit also includes a zero insertion force (ZIF) socket for easy testing of the MSOPpackaged sensors. GMR Sensors: * Smaller * More sensitive * More precise * Lower power ADV001-00E Digital 4 Oe Bipolar 4.5V - 30V 2 mA MSOP AD004-00E...