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 inter- connected, 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 D Internal protection measures for pulses according to ISO TR 7637/1 D ESD according to MIL-SID-883 C test method 3015.7 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 – 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 OSC Oscillator VS GND 13945 Pilot lamp VStab TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 1 (8) U2480B Detailed Block Diagram 16 K1 22 V 15 22 V + – 22 V + – 10 Voltage drift of comparator threshold Ith = f (VS) VS 23 V Stabilized voltage Vstab = 5.5 V 13 17 Poweron reset Vstab 7V 8 Oscillator Osc 7V Divider Ith 3 2 20 19 21 5 4 27 26 1 28 23 22 24 7 8 9 Clock 1 Tosc x2 Clock 2 Tosc x20 T1 Ref E1 K2 Forward and return counter T = 1.2 s Ref E1 K3 E2 Ref E1 Ref E1 Ref E1 T2 Start forward High at counter end Set Start return High at counter zero Reset Out K4 14 K5 T2 Vout T1 Reset Latch for indicator and stop lamps Out Set K6 + – Ref E1 K7 Ref E1 + – Forward and return counter T = 1.2 s E2 K8 Start forward High at counter end 25 V Start return High at counter zero + – 11 12 Latched at signal ”low” BL SP 13910 Figure 1. Block diagram 2 (8) TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 U2480B Pin Description REFK6 E1K2 RefK2 E1K4 1 28 27 2 26 3 25 4 E1K6 REFK5 E1K5 NC Pin 1 Symbol REFK6 2 3 E1K2 REFK2 4 5 E1K4 REFK4 6 7 E1K8 REFK8 OSC GND VS BL REFK4 5 24 E2K7 8 9 10 11 E1K8 6 23 REFK7 12 SP REFK8 7 22 E1K7 OSC 8 21 E2K3 13 14 15 16 Vstab Vout E1K1 REFK1 17 18 19 20 E2K1 NC E1K3 REFK3 9 20 REFK3 VS 10 19 E1K3 21 22 E2K3 E1K7 BL 11 18 NC 23 REFK7 SP 12 17 E2K1 Vstab 13 16 REFK1 24 25 26 27 E2K7 NC E1K5 REFK5 28 E1K6 GND Vout 14 15 Function Reference for threshold voltage single comparator K6 Input 1; single comparator K2 Reference for threshold voltage; double comparator K5 Input 1; single comparator K4 Reference for threshold voltage; double comparator K4 Input 1; single comparator K8 Reference for threshold voltage; triple comparator K8 Oscillator input Ground Supply voltage Input window comparator for direction indicator Programming pin for memory function Stabilized voltage Output for tell-tale lamp Input 1; double comparator K1 Reference for threshold voltage; double comparator K1 Input 2; double comparator K1 Not connected Input 1; double comparator K3 Reference for threshold voltage double comparator 3 Input 2; double comparator K2 Reference for threshold voltage; double comparator K7 Reference for threshold voltage double comparator 7 Input 2; double comparator K7 Not connected Input 1; single comparator K5 Reference for threshold voltage single comparator 5 Input 1; single comparator K6 E1K1 13373 Figure 2. Pin configuration TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 3 (8) U2480B Functional Description Comparators The voltage threshold of all internal comparators has a typical value of Vth = 10 mV. w A voltage drop accross the shunt of Vsh Vth means no fault in the lamp circuit and the output is disabled. v In the event of a voltage drop Vsh Vth, the output supplies the current IO, and the pilot lamp is activated by the external transistor. The output is reliably disabled for a voltage at the reference pin of the comparators of VminRef 1/3 VS v The typical values of the input currents are 25 mA and are equally large at the switch-over instant, thus making it possible to connect protective resistors in series. The internal threshold is independent of the value of the protective resistor as long as all resistors of a comparator have the same value. pulse time corresponds to an item of fault information. The time delay until the fault is indicated exceeds the time td = 1.2 s in this case. Storage A failure in the break light circuit which is present for longer than td is stored. v A voltage of VBL 0.15 VS which is present at the input BL for longer than td leads to fault indication with storage. This allows the possibility of additional flashing monitoring. w v A voltage of VBL 0.2 VS and of VBL 0.65 VS which is present at the input BL for longer than td leads to fault indication without storage. It is thus possible to extend the scope of monitoring beyond 11 lamps by means of additional comparators ICs. w 0.7 V S at the input BL does not cause Fuse Monitoring A voltage of VBL a fault signal. It is possible to monitor the fuses of the lamp circuits by means of an EXCLUSIVE OR function between K1 and K3 and between K5 and K6. The turn indicator and the brake light memory is maintained by VS (terminal 15) If the Ref pin of K1 (orK5) is low and the Ref pin of K2 (or K6) is simultaneously high, or vice versa, a fault is indicated. Simultaneous failure of both fuses is not detected. A fuse is faulty if the input voltage at the pin Ref falls below the voltage VminRef (1/3 VS). Time Delay " A fault is indicated only if it is present for td = 1.2 0.2 s. If an OK pulse 100 ms occurs during this time, time counting is reset to ”0”. An OK pulse is generated if the comparators K1 to K8 and the input BL do not signal a fault. w A periodic fault signal (period of less than 1 s) is indicated only if the mark-to-space ratio is 10/1, whereby the w Power-on Reset When VBatt (terminal 15) is applied to Pin VS, a brief signal is produced which generates the power-on reset. As a result, the turn indicator, the brake light memory and the counters are reset. Outputs A fault signal at the comparators K1 to K8 or at the comparator Pin BL enables the output so that current IO can flow. The output blocking voltage (VS – Vout) is typically 1 V. Threshold Testing without Time Delay td To connect the input comparators directly to the output pin, a voltage of 6 V at Pin OSC is necessary (omit ROSC and COSC). Absolute Maximum Ratings Parameters Supply voltage Pulse current (2 ms) Short circuit current (reversed battery) Output current Ambient temperature range 4 (8) Symbol VS, VBatt IS ISC Iout Tamb Value 16.5 1.1 170 –12 –40 to +100 Unit V A mA mA °C TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 U2480B Parameters Storage temperature range Junction temperature Symbol Tstg Tj Value –55 to +125 150 Unit °C °C Symbol RthJA Value 75 Unit K/W Thermal Resistance Parameters Thermal resistance SDIP 28 Electrical Characteristics VBatt (Kl. 15) = 10 to 15 V, Tamb = –40 to +95_C, supply series resistors and input protection resistors connected (see figure 1 “Block diagram” and figure 3 “Basic application schematic”) unless otherwise specified. Parameters Supply Supply current Power on reset (POR) Comparators Comparator input current during switch over Comparator output current Comparator thresholds Vthx = VREFKx – VExKx x = Pin–No. Minimum comparator input voltage Output Vout Output current Output saturation voltage Protection Voltage of Zener diodes Oscillator Oscillator frequency Test Conditions / Pins VBatt = 12 V, Vout = low VBatt = 12 V VBatt = 12 V Pin 2 Pin 4 Pin 6 Pins 15, 16 Pins 19, 21 Pins 22, 24 Pin 26 Pin 28 Pin 1 Pin 3 Pin 5 Pin 7 Pin 15 Pin 20 Pin 23 Pin 27 VBatt = 12 V VBatt = 15 V Symbol Min. IS VS 3.5 IK2 IK4 IK8 IK11,IK12 IK31,IK32 IK71,IK72 IK5 IK6 IO6 IO2 IO4 IO8 IO1 IO3 IO7 IO5 Vthx Vthx VminRef 5.0 6.3 Typ. Max. Unit 6 5.2 mA V 25 mA –10 mA 10.0 11.4 15.0 16.5 0.33 VS mV mV V Pin 14 VS = 12 V Vsat = VS – Vout Iout = –10 mA all REFKx and ExKx. pins Pin VS Pin BL Pin Vstab and OSC Pin 8 Rosc = 82 kW, Cosc = 10 nF, TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 I14 Vsat –10.0 VZ1 VZ2, VZBL VZ3 22 23 25 7 V V V V fosc 1.67 kHz 1.5 mA V 5 (8) U2480B Parameters Delay time Test Conditions / Pins Symbol Min. Typ. Max. Unit td 1.1 1.2 1.3 s tdb 115 125 135 ms 0.15 VS V 0.6 VS V Debounce time Flashing frequency recognition Fault indication with storage Fault indication without storage No fault indication Input current VBL = low Programming pin Latch ON Latch OFF Input current VSP = 0 V Input current VSP = 12 V Pin BL VBL VBL 0.2 VS VBL IBL 0.7 VS V mA –3.0 Pin SP VSP VSP ISP ISP 0.35 VS 0.45 VS –6.0 300 V V mA mA Package Information Package SDIP28 Dimensions in mm 27.5 27.1 10.26 10.06 4.8 4.2 0.9 3.3 8.7 8.5 0.35 0.25 0.53 0.43 23.114 1 6 (8) 12.2 11.0 1.778 technical drawings according to DIN specifications 13044 TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 U2480B 2 kΩ 2 kΩ 1 28 2 27 *) 2 kΩ VBatt *) Dipped headlight (2x 55 W) 2 kΩ 3 26 4 25 NC 5 24 2 kΩ *) 2 kΩ 1 kΩ 6 2 kΩ *) 22 U2480B 2 kΩ 8 21 9 20 10 19 Cosc 1 kΩ Failure without storage 2 kΩ Failure with storage *) *) *) NC BL 18 11 Indicator control SP VBatt 23 7 Kl 31 Stop light (3x 21 W) *) 2 kΩ 2 kΩ 12 17 13 16 14 15 Open: Store ”on” Rosc *) 1 kΩ VBatt *) 2 kΩ Charge control Park light additional park light (6x 4 W) *) Marker light 2 kΩ 2 kΩ 2 kΩ 1 28 2 27 2 kΩ Reversing light (2x 21 W) *) VBatt *) *) VBatt 2 kΩ 1 kΩ 2 kΩ 3 26 4 25 NC 5 24 *) 2 kΩ 2 kΩ 2 kΩ Fog tail lamp *) VBatt 2 kΩ 6 23 7 22 2 kΩ 2 kΩ U2480B Headlight additional headlight (2x 55 W) Fog lamp (2x 55 W) *) VBatt *) 2 kΩ 8 21 9 20 10 19 *) 2 kΩ *) License plate and side lamps (4x 4 W) NC VBatt 11 18 12 17 13 16 14 15 2 kΩ High: Store ”off” 1 kΩ 2 kΩ *) VBatt *) *) Shunt 13911 TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97 7 (8) U2480B Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423 8 (8) TELEFUNKEN Semiconductors Rev. A1, 22-Oct-97