HALLSENSOREV1 USER GUIDE DESCRIPTION The HALLSENSOREV1, Figure 1, is a PCB constructed using an FR4 base for demonstrating various Diodes Inc Hall sensor devices in a sales environment. There are on-board LEDs to show the operation of the devices, as well as test points to connect an oscilloscope or multimeter. The board is operated from a PP3 9V battery, fitted to the underside, and has a diode fitted for reverse polarity protection. The power switch is at the top right hand corner of the board. Figure 1: HALLSENSOREV1 Demonstration board Once the board is switched on, the Hall sensor devices will respond to magnetic fields, which can either be introduced by an external magnet, or by turning the magnet rotor arm to place the N or S fields over each Hall sensor device. Figure 2: Magnet rotor arm The magnet rotor arm (figure 2) is simply a swiveling arm that is fitted with two magnets. It is marked on the top side with the pole of the magnet that is pointed downward toward the device – N at one end of the arm, S at the other. This shows the behaviour of each device in the presence of an N or S field. When a device is activated by the magnetic field, LEDs on the board will light to show what the device outputs are doing. The outputs are also available on test points. Issue 2 – Janyary 2011 © Diodes Incorporated, 2009 www.diodes.com HALLSENSOREV1 AH337 UNIPOLAR - http://www.diodes.com/products/catalog/detail.php?item-id=1796 PCB Bottom Left Figures 3&4: AH337 Circuit AH337 is a Unipolar Device. The output will be switched on (active low) when a N pole is placed over the device (Please note the package orientations in the datasheet). The output does not latch, nor respond to a S field. The red LED adjacent to the AH337 will illuminate when a strong enough N field is present. S N Parameter Bop Brp Vsat Vdd Typical Value/range -120 -60 300 4.2 – 28 Unit Gauss Gauss mV V Figure 5 & Table 1: AH337 Operating characteristics Table 2: AH337 Package and Reel options Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 2 HALLSENSOREV1 AH1802 OMNIPOLAR - http://www.diodes.com/products/catalog/detail.php?item-id=1801 PCB Left Centre Figures 6&7: AH1802 circuit AH1802 is an Omnipolar device. The single output will be switched on (active low) when either a north or south pole is place over the device. The output does not latch. The orange LED adjacent to the AH1802 will illuminate when a field is present. Output Bopn Bhy (On state) Vsat Brpn Brps 0 (Magnetic Flux Density B) Parameter Bops Brps Bopn Brpn Vdd Turn on N Vsat Turn off (On state) Turn off Turn on Bhy Vcc state) (Output Voltage) (Off Typical Value/range 28 20 -28 -20 2.2 – 5.5 Bops S Unit Gauss Gauss Gauss Gauss V Figure 8 & Table 3: AH1802 Operating characteristics Table 4: AH1802 Package and Reel options Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 3 HALLSENSOREV1 AH1887 BIPOLAR- http://www.diodes.com/products/catalog/detail.php?item-id=1808 PCB Top Centre AH1887-ZG-7 Figures 9&10: AH1887 Circuit AH1887 is best described as a Twin Unipolar device, although it could be considered Bipolar. Output 1 will be switched on (active low) when a S pole is placed over the device and will release when the field is removed. Output 2 will be switched on (active low) when a N pole is placed over the device and will release when the field is removed. Neither output latches. Output 1 will illuminate a yellow LED (south field) and output 2 will illuminate a red LED (north field). Parameter Bops Brps Bopn Brpn Vsat Vdd Typical Value/range 61 53 -61 -53 0.2 1.65 – 3.3 Unit Gauss Gauss Gauss Gauss V V Figure 11 & Table 5: AH1887 Operating characteristics AH1887-ZG-7 Table 6: AH1887 Package and Reel options Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 4 HALLSENSOREV1 AH3761 BIPOLAR LATCH - http://www.diodes.com/products/catalog/detail.php?item-id=5486 PCB Right Centre Figures 12&13: AH3761 circuit The AH3761 is a Bipolar latching device. The output is switched on by the presence of a north pole and switched off by the presence of a south (note package orientation in the datasheet. The characteristic diagram below is drawn to show the operation of the surface mount device when operated from above (ie marking side)). Output N Turn off Turn on Vsat Bhy Vcc (Output Voltage) (Off state) (On state) Bop Brp 0 (Magnetic Flux Density B) Parameter Bop Brp Vsat Vdd Typical Value/range -30 30 300 3 – 28 S Unit Gauss Gauss mV V Figure 14 & Table 7: AH3761 Operating characteristics Table 8: AH3761 Package and Reel options Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 5 HALLSENSOREV1 AH342 BIPOLAR LATCH - http://www.diodes.com/products/catalog/detail.php?item-id=1814 PCB Bottom Right Figures 15 & 16: AH342 circuit The AH342 is a Bipolar complementary latching device. The two outputs will be in opposite states, depending on the magnetic field detected. Additionally, the outputs will both sink and source current. If the outputs are connected across the load (as on this board) then the direction of current flow will indicate the polarity of the last detected magnetic field. The red LED (D6) will be lit when a north pole is detected and remain lit until a south pole is detected. The yellow LED (D7) is lit by a south pole being detected and turned off by a north pole. Parameter Bop Brp Vsat Vdd Typical Value/range 30 – 150 -30 – -150 0.1 4.5 – 28 Unit Gauss Gauss V V Figure 17 & Table 9: AH342 Operating characteristics Table 10: AH342 Package Option Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 6 HALLSENSOREV1 INTENTIONALLY BLANK Issue 2 – January 2011 www.diodes.com © Diodes Incorporated 2009 7 HALLSENSOREV1 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDING TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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