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BU52069GWZ-E2 Datasheet(PDF) 7 Page - Rohm |
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BU52069GWZ-E2 Datasheet(HTML) 7 Page - Rohm |
7 / 19 page 7/15 BU52069GWZ TSZ02201-0M2M0F414040-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 7.Nov.2014 Rev.001 www.rohm.com TSZ22111 • 15 • 001 Description of Operations Micropower Operation (Small Current Consumption Using Intermittent Sensing) (Offset Cancellation) The unipolar detection Hall IC uses intermittent sensing save energy. At startup the Hall elements, amplifier, comparator, and other detection circuits power on and magnetic detection begins. During standby, the detection circuits power off, thereby reducing current consumption. The detection results are held while standby is active, and then output. Reference Period: 50ms (MAX100ms) Reference Startup Time:24µs IDD Standby Time Startup Time Period t Figure 12 The Hall elements form an equivalent Wheatstone (resistor) bridge circuit. Offset voltage may be generated by a differential in this bridge resistance, or can arise from changes in resistance due to package or bonding stress. A dynamic offset cancellation circuit is employed to cancel this offset voltage. When the Hall elements are connected as shown in Figure 13 and a magnetic field is applied perpendicular to the Hall elements, a voltage is generated at the mid-point terminal of the bridge. This is known as Hall voltage. Dynamic cancellation switches the wiring (shown in the figure) to redirect the current flow to a 90° angle from its original path, and thereby cancels the Hall voltage. The magnetic signal (only) is maintained in the sample/hold circuit during the offset cancellation process and then released. + GND VDD - I B× Hall Voltage Figure 13 |
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