WSH131 Omnipolar Hall Effect Switch IC Features: z Operates from 2.4V to 26V supply voltage z Operation with North or South Pole z On-chip Hall Sensor and driver z On-chip temperature compensation circuitry minimizes shifts in On/Off points temperature and supply voltage z On-chip voltage regulator to stabilize On/Off switch point z Wide range operating temperature –20 ~ 85℃ z Easily Manufacturability with magnet pole independence South or North magnetic field: Output Low No magnetic field : Output High. Functional Description: WSH131 is designed to integrate pole independent Hall sensor with output driver together on the same chip. Either North or South magnetic field with sufficient strength will turn the output on (low). In the absence of a magnetic field, output is off (high). The polarity independence allow WSH131 to easily replace reed switches for superior reliability and case of manufacturing. To improve stability, it includes a temperature compensated voltage regulator, a differential amplifier, a Hysteresis controller and a open-collector output driver capable of sinking up to 20mA current load. The temperature-dependent bias increases the supply voltage of the hall plates and adjusts the switching points to the decreasing induction of magnets at higher temperatures. Subsequently, the output can keep switching on/off on more precise switch point regardless to the ambient temperature. WSH131 are rated for operation over temperature range from –20˚ C to 85 ˚C and voltage ranges from 2.4V to 26V. Pin Descriptions: Name P/I/O Vdd P Gnd P Vout O Pin# 1 2 3 Description Positive Power Supply Ground Output Pin Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2013/5/23(Rev. B) 1 WSH131 Absolute Maximum Rating (at Ta=25˚ C) Supply Voltage Vcc -------------------------Output breakdown Voltage Vout(breakdown) --------------Magnetic flux density B -------------------------Output ON Current (continuous) Ic -------------------------- 26V 30V Unlimited 20mA Operating Temperature Range Storage Temperature Range Package Power Dissipation (-20˚C to +85˚C) (-65˚C to +150˚C) 350mw Ta -------------------------Ts -------------------------Pd -------------------------- Electrical Characteristics: (T=+25˚C, Vcc=2.4V to 26V) Characteristic Symbol Test Conditions Min Typ Max Units Supply Voltage Vcc 2.4 26 V ─ ─ Output Saturation Vout Vcc=12V,Ic=10mA ─ 0.2 0.6 V Voltage (sat) B > Bop Output Leakage Ileakage Vcc=12V, B<Brp uA ─ <0.1 10 Current Supply Current Is(off) Vcc=12V,Output 3.0 6 mA ─ Open Function Block: Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2013/5/23(Rev. B) 2 WSH131 Magnetic Characteristics: Characteristic Symbol Grade Operating Point Bop A Min. ±20 B ±20 A ±10 Gauss B ±10 Gauss Operating Point Hysteresis Window Brp Bhys Typ. 10 Max. ±100 Gauss ±150 Gauss 30 Ps: ﹢﹣indicate direction of magnetic field﹐1mT=10 Gauss Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2013/5/23(Rev. B) 3 Unit Gauss WSH131 Package Information: TO-92S: SOT-23: Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2013/5/23(Rev. B) 4