U2481B Datasheet | TEMIC Semiconductors

TELEFUNKEN Semiconductors .. U2481B/ U2482B Automotive Lamp Outage Monitor Description The U2481B and the U2482B multiparator circuits are designed to monitor automotive illumination by sensing the voltage drop across shunt resistors. Provided with extremely low parator thresholds, these ICs can be used together as a chip set to build an entire lamp monitor system. Single operation of both circuits is also possible. As a special feature for brake lamp monitoring, the U2481B contains a latch stage connected to one of its triple parators. With - 4 single parators - 1 double parator and - 2 triple parators each of the integrated circuits monitors up to 12 lamps and up to 6 fuses. All parator stages are bined together to control the mon output stage. Features D Extremely low parator thresholds of typically 3.5 m V D Internal pensation for copper shunts D Internal pensation for voltage-dependent bulb characteristic D parator input voltage may exceed supply voltage 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 k V - Machine model: 200 V EMI protection (TEM cell up to 100 V/m) Benefits D Extremely low threshold voltage gives low voltage drop via shunt resistor. Power dissipation of the lamp monitor module is minimized D Perfect EMC in conjunction with an appropriate pc board layout Applications Both ICs can be used in any kind of vehicle with a 12 V supply. It is sufficient to insert small resistors into the lamp wiring and to provide the dashboard instrument cluster with a pilot lamp. These ICs increase the safety and add fort Features . Rev. A1: 21.08.1995 Preliminary Information 1 (11) U2481B/ U2482B .. TELEFUNKEN Semiconductors Block Diagram VB 20 REFK1 IN1K1 28 Ref 27 E1 + - IT IT VB K1 13 m V Voltage drift of parator threshold IT = f (VB) Power on Reset POR IT Divider REFK2 IN1K2 1 2...