FSH4917 Datasheet | FOSLINK SEMICONDUCTOR

FEATURES Micro power design Operation with North or South pole(omni polar) 2.4V to 5.5V battery operation High sensitivity and high stability of the magnetic switching points z High resistance to mechanical stress z Digital output signal z Good RF noise immunity z -40℃ to 85℃ operating temperature .. z Programming pin for switching detection of output z Package: SOT23-6L z z z z - GENERAL DESCRIPTION The FSH4917 is an Integrated Hall Effect Sensor designed specifically to meet the requirements of l o w power devices. e.g. as an On/Off switch in Cellular Flip-Phones, with battery operating voltages of 2.4V - 5.5V. Precise magnetic switching points and high temperature stability are achieved through the unique design of the internal circuit. An onboard clock scheme is used to reduce the average operating current of the IC. During the operate phase the IC pares the actual magnetic field detected with the internally pensated switching points. The output is switched at the end of each operating phase. During the Stand-by phase the output stage is latched and the current consumption of the device reduced to some µA. The IC switching behavior is Omni polar, i.e. it can be switched on with either the North or South pole of a magnet. The PRG pin can be connected to VDD which holds the output VO at a High level for B=0m T; conversely the output VO can be inverted by connecting the PRG pin to GND, which will hold the output VO at a Low level for B=0m T. In this later case the presence of an adequate magnetic field will cause the output VO to switch to a High level (i.e. off state). - FUNCTIONAL BLOCK DIAGRAM Awake & Sleep Timing Logic VOUT Hall Plane Dynamic Offset Cancellation Latch circuit Chopper Amplifier Hysteresis Latch GND PRG - TYPICAL APPLICATION CIRCUIT 6 PRG 5 GND FSH4917 4 GND _ 0.1μF Vout 3 50KΩ Vco 1 GND 2 + 2.4-5.5V Output 1/9 2006-12-22 MICRO POWER, ULTRA-SENSITIVE HALL SWITCH - PIN CONFIGURATION (Top View) PRG GND GND 2 1...