LM1042 Datasheet | National Semiconductor

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 m A 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 m A Output Current Pin 11 (source) Output Current Pin 16 Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 sec ) Package Power Dissipation TA e 25 C (Note 8) Device Power Dissipation 25 m A g 10 m A b 40 C to a 80 C b 55 C to a 150 C 260 C 1 8W 0 9W Electrical Characteristics VCC e 13V TA within operating range except where stated otherwise CT e 22 m F RT e 12k Tested Limits (Note 2) Min VCC IS VREG Supply Voltage Supply Current Regulated Voltage Stability Over VCC Range V6 - V3 Probe Current Reference Voltage Probe Current Regulation Over VCC Range T1 T2 - T1 T4 - T1 TSTAB RT V8 V8 I8 I8 V16 Ramp Timing Ramp Timing Stability Ramp Resistor Range...