A4231

a4231 general features The a4231 is a proximity sensor integrated circuit to be used with a broad range of inductive single-coiled proximity transducers in proximity detection applications  Monolithic IC in bipolar technology  User-adjustable sensing range by means of a single external resistor  User-adjustable hysteresis (0…15%)  5.5V…35V broad supply voltage range  Low-voltage operation possible using stabilised 4.5V…5.5V voltage source  Internal voltage regulator to improve immunity against fluctuations of supply voltage  Broad operating temperature range: -25°C...90°C  Can work with a broad selection of inductive transducers  NPN open collector output with guaranteed sink current of 150mA  Output overload/over current protection  Integrated power-on and detect LED drivers  Normally open(NO)/normally closed(NC) select pin  Broad range of operating frequencies: 100kHz…1MHz  Output over current and short-circuit protection  Easy temperature compensation of proximity transducers  Package – QFN-24 example application schematic min. 2.2uF/40V electrolytic CF 100nF/6.3V 10% Vcc NO/NC 220nF/6.3V 20% ceramic VCC CB P_LED RF Inductive Transducer L C RES L1 RF NO/NC L2 220nF/6.3V 20% Rref GND RH a4231 D_LED OutN GND1 C DET C OVL RSN RS,N 1R6 5% 125mW OutN 91kohm Rhyst, 5% (optional) Cdet, 10% (optional) Covl, 10% 100nF/6.3V Typical application schematic of a proximity sensor/detector electrical characteristics DC Characteristics The typical values are given for VCC =24V and Tj = 25°C unless otherwise specified. # 1 2 3 4 5 6 Symbol IVCC,OFF IVCC,ON VSAT,OUT ILED ILKG ITH,OVL Parameter Supply current Supply current Output saturation voltage LED current Output leakage current Overload threshold current*1) 158 Conditions Output inactive (off) Output active (on) IOUT=150mA 1.0 Min Typ 3.8 8.5 0.50 1.2