DESCRIPTION
If the attenuation exceedes an internal threshold- sensortip outsidethe liquid or liquid temperaturehigher than a determinedvalue - a squarewave alarm output indicates an unsufficient liquid condition.If the liquid levelis restoredbeforethe end of a delay time the alarm is not activated. Throughtwo pins it is possible to program : the delay BLOCK DIAGRAM time to activate the alarm, the duty cycle of the output squarewave,the polarity of the input threshold of the sensor for alarm activation. Theabovefeaturesmake theL4620particularlyversatile for many applications and give the possibility to use various sensor types. Internal circuits prevent spurious indications from the liquid sensor and a latch keeps the alarm activateduntilthe supply voltageis switchedoff.The device includes thermal shutdown protections. December 1999 1/9 L4620 ABSOLUTE MAXIMUM RATINGS
Symbol IS V3 Iout Ptot Tj, Tstg Supply Current (VS > VZ) Sensor Input Voltage (V2 High) Output Current Power Dissipation...
STMicroelectronics
