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ZXBM2001 Datasheet(PDF) 4 Page - Zetex Semiconductors |
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ZXBM2001 Datasheet(HTML) 4 Page - Zetex Semiconductors |
4 / 10 page Block Diagram (ZXBM2001): Pin Assignments Pin Functional Descriptions 1. VCC - Applied voltage This is the device supply voltage. For 5V to 12V fans this can be supplied directly from the Fan Motor supply. For fans likely to run in excess of the 18V maximum rating for the device this will be supplied from an external regulator such as a zener diode. 2. H+ - Hall input 3. H- - Hall input The rotor position of the Fan Motor is detected by a Hall sensor whose output is applied to these pins. This sensor can be either a 4 pin ‘naked’ Hall device or a 3 pin buffered switching type. For a 4 pin device the differential Hall output signal is connected to the H+ and H- pins. For a 3 pin buffered Hall sensor the Hall device output is attached to the H+ pin whilst the H- pin has an external potential divider attached to hold the pin at half VCC. When H+ is high in relation to H- Ph2 is the active drive. ZXBM2001 ZXBM2002 ZXBM2003 SEMICO NDUC TORS ISSUE 4 - OCTOBER 2004 4 Top View |
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