TELEFUNKEN Semiconductors 12.97 Flasher Electronic flashers
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General Technical Information
TELEFUNKEN Semiconductors 12.97
Flasher
Electronic flashers with lamp-outage detection basic equipments modern vehicles. TEMIC`s voluminous flasher program meet most manufacturers' requirements regarding direction indication hazard warning. flasher detect lamp outage sensing voltage drop lamp current causes shunt resistor. Lamp outage signalized significant increase flasher frequency with minimum factor two. shunt-resistor values following table calculated reference integrated outage-detection thresholds standard 21-W bulbs whereby switch-over point lamp load Overview TEMIC's Flasher
Type Typical Shunt Load-Dump Protection Level Pilot Lamp Connected VBatt Number Relay Drivers Disabling Shunt Bypass Number Control Inputs Standby Current Package Minimum Lamp Load
Protection against conducted interferences: flasher qualified according level ISO/TR 7637-1 with exception load-dump pulse, table. While first flasher types table designed one-relay flasher modules, last (U2044B) different type with following features:
intergrated relay drivers (separate loops right
left vehicle side)
control inputs direction indication hazard
warning (simple switches connectors used)
hazard mode, frequency doubling disabled
U2043B U643B DIP8 DIP8 DIP8 DIP8 DIP8 DIP8 U6043B U6433B U6432B U644B VBatt U2044B DIP14 SO14
*with ext. capacitor
TELEFUNKEN Semiconductors 12.97
Wipe/ Wash Control
order adapt wiper speed different situations terms traffic rain, intermittent wiper control basic convenient feature automotive wipers. cleaning windscreen spraying water dry-wiping afterwards (wipe/wash function) contribute traffic safety. Both functions usually combined Integrated Circuit. TEMIC offers portfolio various intermittent wipe/wash control ICs. Each them tailored certain requirement regarding timing wireharness, switches motor used vehicle. Designed bipolar technology, debounced input stages integrated output driver stage automotive relay common features wiper control ICs. various features TEMIC wiper control support design-in individual wiper control systems matched requirements automotive industry:
Wipe/wash switch: high- lowside Wiper motor with high- lowside switch Wiper motor with without park-position feedback Wash pump with high- lowside switch Intermittent pause time: adjustable driver fixed module manufacturer
Broad range intermittent pause time Broad range dry-wiping time Simultaneous start wash pump wiper motor
wiper motor delayed
windscreen backlite wiper systems Motor current relay contact park switch
wiper designed accordance needs automotive industry. They withstand harsh environmental conditions with only external components. Protection against conducted interferences according level ISO/TR 7637-
Intermittent switch: high- lowside
Overview TEMIC`s Wiper Control
Selection switch polarity (wire harness) Type Switch Polarity (Active Position) WIWA PARK Input Debouncing WIWA PARK Motor Current Relay Contact WIWA
U642B U641B U840B U842B U846B U2640B U2641B U2642B VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt VBatt
special function; data sheet TELEFUNKEN Semiconductors 12.97
Overview TEMIC`s Wiper Control
Selection timig Type Prewash Delay Dry-wiping Delay Interval Pause Interval Potentiometer Control Relay Activation Time Park Switch
U642B (var)
U641B
(var)
U840B
U842B U846B
U2640B U2641B U2642B
cycles cycles
series switch series switch series switch series switch
Timer
TEMIC`s timer multi-purpose parts developed qualified accordance needs vehicle applications. They well matched power-saving applications, where high wattage loads like backlite heating operated certain time only switched automatically when adjusted delay time passed. timer basically consists non-retriggerable monoflop triggered different input signals control integrated open-collector driver stage powerful enough drive automotive-type relay directly. integrated Zener diode limits inductive switch-off pulse. timer relay usually assembled same board relay output stage designed simply without short-circuit protection.
monoflop time based oscillator number divider stages. most important benefits TEMIC's timer their high flexibility thanks possible combinations elements which determine oscillator frequency. This results very broad range delay times from seconds several hours. further benefit high spike immunity debounced input stages. U6049B special timer modification dedicated radiator-fan control cooling down switched-off engines.
Overview TEMIC`s Timer
Type
U6046B U6047B U6049B VBatt VBatt
Switch Polarity TOGGLE
Typical Application Thermo Switch
VBatt
Heated backlite delay Heated backlite delay Radiator delay
TELEFUNKEN Semiconductors 12.97
Lamp-Outage Monitoring
Introduction
important requirement traffic safety vehicle proper function lighting system. drivers must ensure that lighting system operates correctly before starting drive. This stipulated road traffic safety regulations. main problem control brake lights less conspicuous lighting functions such parking light, license plate light reversing lamps. Only lamp monitoring devices permit reliable display malfunctions even when vehicle moving. Protective Function external series resistor ground line protects against polarity reversal. case positive interference pulses load dump, limits voltage means integrated Zener diode between vehicle's supply voltage therefore split into resistor voltage voltage same negative interference pulses, only voltage this case. Discharge diodes inputs Zener diodes outputs protect against electrostatic discharge. filters integrated comparator inputs protect against electromagnetic irradiation.
Circuit Conception
economically optimal technologically most reliable conception lamp-monitoring system connection low-resistance measuring resistors series with lamp. comparator evaluates voltage across measuring resistor. When functionality check carried out, correct lamp operation indicated yes/ statement. lamp failure indicated pilot lamp dashboard vehicle. also pilot lamp have failure, necesary check correct operation, too.
Lamp-Outage Monitors
Basic Function second generation lamp-monitoring includes several comparators with fuse monitors, logic combinations, adjustable delays, store brake light combined outputs. Monitoring carried only means switched-on lamp. TEMIC-patented lamp comparators powered supply. comparator inputs current mirrors which draw identical currents inputs when voltage threshold reached. voltage threshold achieved difference emitter resistances current mirror. voltage threshold product reference current difference emitter resistance values. (R1-R2) IRef reference current IRef constant current (generated band-gap circuit) current which increases with rising supply voltage. voltage threshold therefore rises with increasing supply voltage achieves required lamp characteristic. second comparator monitors voltage reference pin. lamp monitored switched voltage less than monitoring does take place. Additional fuse monitoring realized combining such comparators exclusive pilot lamp activated after delay comparator signals fuse lamp failure. This important prevent loose contacts interference pulses caused pilot lamp flashes. Protective Functions external diode protects against polarity reversal. This diode also prevents block capacitor from discharging case negative pulses. Thus, ensured that fault memory brake lights reset.
Lamp-Outage Monitors Basic Function first generation lamp-monitoring contains comparators with open-collector output each common reference voltage divider. integrated comparators cannot operated supply. That say, reference voltage divider must possess higher potential than power supply rule, both pins connected with each other comparator inputs lower potential shunt resistors. comparator threshold matched lamp characteristic temperature-compensated. narrow tolerance threshold achieved Zener zapping. comparator threshold measured within given window then adjusted exact value correspondingly burning Zener diodes. integrated Miller capacitor between base collector generates time delay. short delay time acts time hysteresis prevent oscillation output when comparator threshold exceeded. essential resistor increases saturation voltage outputs load current increases. TELEFUNKEN Semiconductors 12.97
event positive pulses load dump, voltage divided between back-up resistor 23-V Zener diode contrast first-generation lamp-monitoring ICs, fixed ground reference maintained even event interference pulses. comparator inputs also posses external back-up
resistors integrated 22-V Zener diodes which realize voltage division protect These Zener- discharge diodes also provide electrostatic protection filters integrated comparator inputs protect against electromagnetic irradiation.
Overview TEMIC`s Lamp-Outage Monitoring
U2480B U2481B Multi-comparator Multi-comparator U2482B Multi-comparator U4790B U4791B Dual-comparator Dual-comparator U4793B Dual-comparator comparators, 44.5-mV threshold, output stages
Type U479B
Function Dual-comparator
Features comparators, 8-mV threshold, output stages double/ single comparators, 10-mV threshold tiple, double single comparators, 3.5-mV/ 13-mV threshold, output stage triple, double single comparators, 3.5-mV/ 13-mV threshold, output stage comparators, 8-mV threshold, output stages comparators, 50-mV threshold, output stages
Benefits Monitoring single lamps, protection With stop-lamp latch, highlevel threshold copper layer shunts, stoplamp latch, high-level threshold copper layer shunts, highlevel Monitoring single lamps, protection Monitoring parallel lamps, protection Monitoring overload short circuit, protection
Dashboard Dimmer
Introduction
Circuit Conception
Today, brightness control instrument panel illumination part standard equipment passenger cars. Even dial illumination radio controlled. classic brightness controller with wire-wound potentiometer inexpensive solution power values more than power dissipation potentiometer controller becomes high that longer possible accommodate dashboard with required cooling system. Electronic brightness controllers with pulse-width modulation were therefore introduced luxury cars years ago. They used types passenger cars. electronic dimmer most economical solution power range from Further advantages include compact size, short-circuit resistance lamp output linear control pulse width from 100%.
basic circuit dimmer essentially consists pulse-width modulator which permits linear control pulse duty factor. standard N-channel power MOSFET used lamp control. This requires lower control currents than bipolar output stages generates lower saturation voltage losses than Darlington output stages. MOSFET determines power range dimmer. Since instrument panel illumination system possesses fixed earth reference, dimmer designed highside driver. gate voltage exceeding respective operating voltage required drive N-channel MOSFET. drive circuit therefore requires internal charge pump. entire drive circuit MOSFET accommodated bipolar ASIC.
Basic Function
control voltage applied control input voltage divider with potentiometer. control signal N-channel power MOSFET produed comparison this direct voltage with output TELEFUNKEN Semiconductors 12.97
signal delta oscillator. delta oscillator consists power sources. upper source constantly switched lower source take twice current switched with comparator. frequency-determining component external capacitor oscillator pin. gate voltage which higher than power supply VBatt required enable MOSFET fully switch through state. This voltage generated during clocked operation bootstrap circuit with external charge capacitor and, 100% duty factor, charge pump using integrated oscillator kHz).
external series resistor ground line protects against polarity reversal. physical design power MOSFET also includes large-sized power diode between drain source which becomes conductive event polarity reversal. dimmer switched defined manner prevent undefined output signals case undervoltage overvoltage. external resistor ground line also provides effective protection circuit against interference pulses (e.g., load dump). internal voltage fixed limits IC's supply voltage. vehicle's supply voltage thus divided between resistor voltage. When voltage drop across external resistor increases, N-MOSFET's gate (which linked internal chip ground) rises. This makes N-MOSFET conductive when voltage drop becomes large enough. load-dump energy thus divided between lamp load N-MOSFET.
Protective Functions
Protective Function Lamp Load range VBatt 12.5 mean output power kept constant from operating voltage 12.5 reduction pulse duty factor output signal. This reduces power dissipation lamps N-MOSFET. Thanks this, lamp's life time shortened overloading. lamp's brightness mainly independent supply voltage 12.5 VBATT
Protective Functions Against Emitted Interference bootstrap capacitor provides gate's charge energy pulse operation that high clock frequency charge pump does produce radio-frequency interference during switching edges signal. Steep switching edges N-MOSFET cause interferences vehicle's power-supply system means capacitive inductive line coupling. dimmer therefore possesses adjustable slope control function with external capacitor
external shunt resistor monitors limits lamp current. Short-circuit deactivation N-MOSFET takes place after delay time reversed only power-on reset. Protective Function with Respect VBATT prevent destruction dimmed lamps, dimmer incorporates number supply-voltage-dependent protective functions
Overview TEMIC`s Dashboard Dimmer
Type Output Active Load Dump Voltage Sharing (FET/Lamp) Load Dump Output Duty Cycle Disabled Limitation Duty Cycle Duty Cycle Reduction Output Status Feedback Enable/ Disable Input Package
U6081B U6083B U6084B DIP8 DIP8 SO16
TELEFUNKEN Semiconductors 12.97
Driver
TEMIC offers family multi-channel driver especially designed parallel, unidirectional communication between electronic systems. TEMIC's hex-driver support three main applications: level shifter: conversion signal into 12-V signal power interface: conversion signal into current channel signal interface: decoupling signals which different electronic systems sients defined 7637-1) means Zener clamping. necessary, several output stages connected parallel. More protection features (under- overvoltage monitoring, protection, common thermal shut-down, short-circuit protection current limitation) give added value. Especially high-temperature applications (e.g. engine compartment), necessary operate maximum junction temperature 150°C. TEMIC therefore offers with U6802B U6807B drivers without chip-monitoring. Nevertheless special heat-sink measures have taken high chip temperatures influence product life time. U6806B most powerful version, coming special SO20 "batwing" package with output stages automotive-type relays.
hex-driver offering includes devices with channels providing excellent separation adjacent channels. While input stages dedicated protected stabilized surrounding, output stages interfacing harsh electrical environment vehicles. Therefore, each output stage protected against tran-
Overview TEMIC`s Driver
Type U6802B U6803B U6805B U6806B U6807B
SO14 SO20 SO14
Number Channels
Output Current
Thermal Shut-down
Short-Circuit Protected Output
Package
TEMIC- Specialized High-Safety Airbag
Airbag systems have significantly increased safety drivers passengers car-crash situations. Nowadays, they standard almost passenger cars. long-time know-how safety-critical airbag components, extensive support, state-of-the-art 0.8-mm BCDMOS technology broad range products which also includes functional macros makes TEMIC reliable partner custom-specific airbag solutions.
Side impact sensors; remote sensors Microcontroller Power supply; converter Diagnostic circuitry continuous monitoring Squib drivers driver passenger bags belts Additional squib drivers side, head, thorax, etc. Squibs
Electronic Central Unit
electronic central unit (ECU) airbag applications contains following components:
Interface
TEMIC focuses interface ICs, these include following functional blocks:
Crash sensor accelerometer
High-side low-side driver stages squibs
TELEFUNKEN Semiconductors 12.97
Driver failure lamp Monitoring circuitry squibs, capacitors
switches
Controlled charge circuitry Precise current sources Self-energy management battery-independent operation
first generation airbag bipolar technology supports 4-channel front airbag system (driver passenger airbag plus belt tensioners) with chip interfaces:
4-channel low- high-side squib drivers with monitoring features components
Multifunctional interface with boost/buck converter
providing plus interface part seat-occupant detection second generation airbag bipolar technology designed airbag systems with both front side airbags. With chip split, ideal approach high-end applications. Besides main interface channels (driver passenger airbag plus belt tensioners), includes 2-channel driver power supply
DC/DC converter (boost/buck converter) Precise amps Analog multiplexer Watchdog Serial interface (SPI)
Depending system requirements, these functional blocks either combined together split into groups modular build flexible concept line with customers' needs. mandatory that interface airbag applications must meet utmost safety requirements. This achieved adding special features which guarantee system components' ability fire squibs time. Monitoring diagnostics therefore core features TEMIC's interface ICs. Unintentional firing squibs prevented partitioning driver stages high- low-side parts. Thus, malfunction short condition switch without effect. Self-energy management i.e., powered capacitors battery cable interrupted needs supply voltage which higher than battery voltage order charge capacitors. Depending system requirement, this supply (and also microcontroller supply) either provided special DC/DC converter incorporated squib driver
Main interface with 4-channel low- high-side
squib drivers with monitoring features components
2-channel interface with low- high-side squib
drivers with monitoring features seat-occupant detection. These stacked fire squibs (e.g. side-, knee- head airbags etc.)
Multifunctional interface with boost/buck converter
providing third generation state-of-the-art 0.8-mm BCDMOS technology 2-IC chip where dedicated front airbags other side airbags including interface remote sensors.
Main with 4-channel low- high-side squib
drivers with monitoring features components including boost/buck converter
Auxiliary with 4-channel low- high-side squib
drivers with monitoring features components including satellite interface side impact sensors complete offering modular airbag concepts, TEMIC presents special Satellite interface satellite interface serves improve microcontroller's link remote impact sensors. provides sensor's current supply converts sensor's currentmodulated signal into voltage signal microcontroller.
TEMIC's Airbag Generations
1992, TEMIC launched first generation airbag interface ICs. TEMIC's second-generation airbag ICs, based more than years intensive research design activities, incorporate extensive know-how regarding development production high-safety custom-specific interface ICs. next generation under development.
TELEFUNKEN Semiconductors 12.97
Miscellaneous
Microcontroller systems critical situations such complete failure malfunctioning system. This caused voltage drops supply software errors like "endless loop". microcontroller able reset itself therefore discontinue provide important functions system, watchdog's task detect such critical situations generate counter measures automatically. TEMIC, Automotive specialist, offers high-safety high-performance watchdog- well fail-safe designed safety-critical applications. Highest safety features only achieved separate from microcontroller operating independent time base monitors microcontroller trigger signal supply voltage. TEMIC provides various types watchdog basing this principle functioning. common feature that they accept incomming trigger frequency within certain time window. frequency either high interpreted incorrect operating microcontroller causes watchdog send reset signal microcontroller. reset signal also generated supply voltage reached stable value case voltage drops. Typical applications:
Powertrain
control) (engine management, transmission
Central body electronics Power window control Sunroof control
Overview TEMIC`s Watchdog/ Fail-Safe
U5020M U5021M U6808B U6809B relay driver relay driver pilot-lamp drivers timing windows active sleep mode timing windows active sleep mode timing window timing window SO16 SO20 TELEFUNKEN Semiconductors 12.97
Wake-up Inputs
Reset Output
Enable Output
Power Outputs
Remarks
Package
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