LM1042

LM1042 Fluid Level Detector February 1995 LM1042 Fluid Level Detector General Description The LM1042 uses the thermal-resistive probe technique to measure the level of non-flammable fluids An output is provided proportional to fluid level and single shot or repeating measurements may be made All supervisory requirements to control the thermal-resistive probe including short and open circuit probe detection are incorporated within the device A second linear input for alternative sensor signals may also be selected Features Y Y Y Y Y Y Y Y Y Y Selectable thermal-resistance or linear probe inputs Control circuitry for thermal-resistive probe Single-shot or repeating measurements Switch on reset and delay to avoid transients Output amplifier with 10 mA source and sink capability Short or open probe detection a 50V transient protection on supply and control input 7 5V to 18V supply range Internally regulated supply b 40 C to a 80 C operation Block Diagram TL H 8709 – 1 C1995 National Semiconductor Corporation TL H 8709 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage VCC Voltage at Pin 8 Positive Peak Voltage (Pins 6 8 3) (Note 1) 10 ms 2A Output Current Pin 4 (I4)(sink) 32V 32V 50V 10 mA Output Current Pin 11 (source) Output Current Pin 16 Operating Temperature Range Storage Temperature Range Lea...