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Details, datasheet, quote on part number:AD024-00
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GMR Switch Precision Digital Sensors
GMR Switch Precision Digital Sensors
Whe n GMR sensor elements are combined with digital on-board signal processing electronics, the result is the GMR Switch. The GMR Switch offers unmatched precision and flexibility in magnetic field sensing. The GMR Switch will accurately and reliably sense magnetic fields with less error than any other magnetic sensor on the market today. In addition, there is little shift in the ma gne tic field operate point of the GMR Switch over voltage and temperature extremes. This gives NVE's customer the ability to make a high precision, high tolerance magnetic sensing assembly. The GMR switch can operate over a wide range of magnetic fields, and is the most precise magnetic sensor on the market. It is the clear choice when a digital output signal is required of a magnetic sensor.
perate Point Error Band for Typical Magnetic Sensors (4.5V to 30V, -40C to +125C)
200 Allegro 3141LLT (Hall Effect) The GMR Switch Holds Tighter Operate Point Specifications Than Any Competing Product!
150
oneywell SS441A (Hall Effect)
Magnetic Operate Point (Gauss)
VE AD023-00 (GMR) NVE AD022-00 (GMR)
50
O
NVE Corporation (800) 467-7141
oneywell 2SSP (AMR)
NVE AD021-00 (GMR)
HH N
11409 Valley View Road, Eden Prairie, Minnesota 55344 USA Web: www.nve.com Email: info@nve.com 11/15/02
GMR Switch Precision Digital Sensors
Quick Reference: GMR Switch Digital Sensors
The following table lists some of NVE's most popular GMR Switch products and their ke y specifications: Part Number Typical Ma gnetic Operate Point (Oe1) 20 40 20 40 28 28 20 28 11 Typical Ma gnetic Release Point (Oe1) 10 25 10 25 14 14 10 14 5 Outp ut Type 2 Ma xi mum Operation Te mperature (°C) 125 125 125 125 125 125 125 125 150 Packa ge Type 3
NVE AD004-02 NVE AD005-02 NVE AD021-00 NVE AD022-00 NVE AD024-00 NVE AD124-00 NVE AD621-00 NVE AD824-00 NVE ADH025-00
Sink Sink Sink Sink Sink Source Sink + Source 2 Sinks + SCP Sink
SOIC8 SOIC8 MSOP8 MSOP8 MSOP8 MSOP8 MSOP8 MSOP8 MSOP8
Notes : 1. 2. 1 Oersted (Oe) = 1 Gauss in air Output Types: Sink = Up to 20mA current sink Source = Up to 20mA current source SCP = Short Circuit Protection available for external transistor See Appendix for package dimensions
3.
Note on Availability of Products
NVE keeps about 25 of the most popular types of GMR Switch products in stock at our manufacturing facility. However, because there are over 100 different varieties of GMR Switch parts, some part numbers may require a 6 to 8 week lead time before production quantities are available. Please contact NVE for further information.
NVE Corporation (800) 467-7141
11409 Valley View Road, Eden Prairie, Minnesota 55344 USA Web: www.nve.com Email: info@nve.com 11/15/02
GMR Switch Product Selection Guide
GMR Switch Product Selection Guide
NVE's GMR Switch is available in a wide range of packaging, output type, and magnetic trigger field varieties. The purpose of this selection guide is to explain the different outp ut and packaging options, as well as to provide information on how to specify the correct part number when ordering. All NVE GMR Switch product part numbers follow the same general form. As shown below, the first "x" in the part number specifies output type and available voltage regulator output, the next two x's specify trigger field and direction of sensitivity, and the last pair specify the package type. The following sections define these variations in detail.
NVE ADxxx-xx
Outp ut Type and Available Regulator Packa ge Type Trigger Field, Direction of Sensitivity, Low Voltage Operation
Output Type and Available Regulator
The first numeric digit of the part number NVE ADxxx-xx specifies the output type, and the availability of a regulated voltage supply on a separate pin. The following four output types are available: 20 mA Current Sink 20 mA Current Source Separate 20 mA Sink and Source Two Separate 20 mA Sinks All outputs turn ON when the magnetic field is applied. An output that turns OFF when the magnetic field is applied is available as a custom product; please consult NVE. So me of NVE's GMR Switches also feature a regulated supply voltage available external to the part on a separate pin. This regulator provides a 5.8V reference capable of supplyi ng up to 3 mA of drive current. This regulated output may be used to run an LED or other low power device.
NVE Corporation (800) 467-7141 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA Web: www.nve.com Email: info@nve.com 11/15/02
GMR Switch Product Selection Guide
In addition to these options, NVE recently introduced a GMR Switch that has provisions for shutting down an external power transistor in case a short circuit is detected. This is useful in applications where the finished sensor assembly must be "bulletproof," or immune to improper connection. The following table defines the first digit in the NVE AD part number:
NVE AD x xx-xx
Number 0 1 2 3 4 5 6 7 8 9 Meaning 20mA Current Sink 20 mA Current Source Separate 20mA Current Sink and 20mA Current Source Two Separate 20mA Current Sinks 20mA Current Sink + Regulated Output Voltage 20 mA Current Source + Regulated Output Voltage Separate 20mA Current Sink and 20mA Current Source + Reg ulated Output Voltage Two Separate 20mA Current Sinks + Regulated Output Voltage Two Separate 20mA Current Sinks + Regulated Output Voltage + Short Circuit Detection and Shut-Off Separate 20mA Current Sink and 20mA Current Source + Reg ulated Output Voltage + Short Circuit Detection and Shut-Off
Trigger Field, Direction of Sensitivity, Low Voltage Operation
The second and third numeric digits of the part number NVE ADxxx-xx specify the ma gne tic trigger field and direction of sensitivity of the part. Five different magnetic trigger fields are available for the GMR Switch: 10 Gauss 20 Gauss 28 Gauss 40 Gauss 80 Gauss (10 Oe, 1.0 (20 Oe, 2.0 (28 Oe, 2.8 (40 Oe, 4.0 (80 Oe, 8.0 mT, 0.8 kA/m) mT, 1.6 kA/m) mT, 2.23 kA/m) mT, 3.2 kA/m) mT, 6.4 kA/m)
Other magnetic trigger field levels ranging up to 250 Gauss are available on a custom basis; please contact NVE.
NVE Corporation (800) 467-7141
11409 Valley View Road, Eden Prairie, Minnesota 55344 USA Web: www.nve.com Email: info@nve.com 11/15/02
GMR Switch Product Selection Guide
In addition to defining the magnetic operate point, these two digits are used to define the direction of sensitivity and optional low voltage operation. The GMR Switch can be ordered in Standard Axis or Cross Axis directions of sensitivity; for definitions please see NVE AD Series Sensitivity Direction and Pin Configuration later in this section. NVE also makes a GMR Switch with the on-chip voltage regulator bypassed. This limits the voltage range of the part, but allows it to operate at voltages as low as 3.0V. The following table defines the second and third digits in the NVE AD part number:
NVE AD x xx-xx
Number 04 05 06 20 21 22 23 24 25 81 82 83 84 Meaning 20 Gauss OP, Standard Direction of Sensitivity 40 Gauss OP, Standard Direction of Sensitivity 80 Gauss OP, Standard Direction of Sensitivity 28 Gauss OP, Standard Direction of Sensitivity 20 Gauss OP, Cross Axis Direction of Sensitivity 40 Gauss OP, Cross Axis Direction of Sensitivity 80 Gauss OP, Cross Axis Direction of Sensitivity 28 Gauss OP, Cross Axis Direction of Sensitivity 10 Gauss OP, Cross Axis Direction of Sensitivity (ADH Series Only; see page 38) 20 Gauss OP, Cross Axis Direction of Sensitivity, 40 Gauss OP, Cross Axis Direction of Sensitivity, 80 Gauss OP, Cross Axis Direction of Sensitivity, 28 Gauss OP, Cross Axis Direction of Sensitivity,
Low Low Low Low
Volt Volt Volt Volt
Note: For parts that operate at 10 Gauss, see the following section describing the NVE ADH Series sensors.
NVE AD Series Sensitivity Direction and Pin Configuration
Pin configuration is for the NVE AD Series GMR Switches is given in the following diagra ms. In addition, most GMR Switch parts are available with a choice of two directions of sensitivity. "Standard" direction of sensitivity is defined as the direction parallel to the edge of the package containing the pins. "Cross-Axis" direction of
NVE Corporation (800) 467-7141 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA Web: www.nve.com Email: info@nve.com 11/15/02
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