AK8775

[AK8775] AK8775 Hall IC for Pulse Encoder Overview AK8775 is a Hall effect latch which detects both “vertical” and “horizontal”(perpendicular and parallel to the marking side of the package) magnetic field at the same time. The result of Hall effect latch operation in vertical and horizontal magnetic field is read out to OUTA pin and OUTB pin. AK8775 is for use in portable devices which uses rotational detection system or incremental pulse encoder such as jog dial utilized for input devices. Features o o o o o 1.6 to 5.5V operation Bop, Brp (Vertical, Horizontal) ±1.5mT(Typ.), Highly sensitive Low power operation : Average 90μA(Typ.) @VDD=3V Two outputs : OUTA (detects vertical magnetic field), OUTB (detects horizontal magnetic field) Small package: SOP-4pin, Halogen free MS1316-E-00 1 2011/July Free Datasheet http://www.datasheet4u.com/ [AK8775] Block Diagram VDD BIAS OSC VSS HE_DRIVE HALL SENSORS TIMING LOGIC LATCH&LOGIC CHOPPER_SW OUTA CHOP_AMP COMP OUTB Figure 1. Block diagram Circuit Configuration Table 1. Circuit configuration Block HALL SENSORS CHOPPER_SW CHOP_AMP COMP BIAS HE_DRIVE OSC TIMING LOGIC LATCH & LOGIC Function Two Hall elements fabricated by CMOS process. Perform chopping in order to cancel the offset of Hall sensor. Amplifies two Hall sensor output voltage with summation and subtraction circuit. Hysteresis comparator. Generates bias current to other circuits. Generates bias current for Hall sensors. Generates operating clock. Generates...