U2480B

U2480B Automotive Lamp Outage Monitor Description The IC U2480B is designed for individual monitoring of 11 lamps in automobiles. Three double comparators and five single comparators, which can be optionally interconnected, permit realization of many monitoring variants. An integrated latch is available to memorize the outage of indicator or brake lamps. Features D 10 mV comparator thresholds D Temperature compensated D Voltage characteristic of the lamps is taken into D D account Input voltage range up to 23 V independent of supply Typical input currents 25 mA, so that protective resistors can be connected in series D Internal protection measures for pulses according to ISO TR 7637/1 D ESD according to MIL-SID-883 C test method 3015.7 – Human body model: 4 kV – Machine model: 200 V EMI protection (TEM cell up to 100 V/m) Ordering Information Extended Type Number U2480B Package SDIP28 Remarks Block Diagram VBatt 3 double comparators 5 single comparators Stabili– zation VStab Logic / Timing Latch Output stage Oscillator OSC VS GND Pilot lamp VStab 13945 TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 1 (8) U2480B Detailed Block Diagram 16 22 V 15 22 V 17 22 V + – Poweron reset Ith Oscillator 7V Divider Clock 1 Tosc x2 T1 Ref E1 Ref E1 E2 Ref E1 Ref E1 K3 K2 Forward and return counter T = 1.2 s Start forward Start return K4 14 K5 T2 T1 Reset Latch for indicator and stop lamps Out Set + – Vout High at counter end High at counter zero Set Out Clock 2 Tosc x20 T2 ...