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U2402B-B telefunken semiconductors rev. a2, 21-mar-96 1 (17) fast charge controller for nicd/nimh batteries description the fast charge battery controller circuit, U2402B-B, uses bipolar technology. it enables an efficient and eco- nomic charge system. it incorporates intelligent multiple gradient battery voltage monitoring and mains phase con- trol for power management. with automatic top-off charging, the integrated circuit enables the charge device to stop regular charging, before the critical stage of over- charging can occur. it has two led driver indications for charge and temperature status. features multiple gradient monitoring temperature window (t min /t max ) exact battery voltage measurement without charge phase control for charge current regulation top off and trickle charge function two led outputs for charge status indication disabling of d 2 v/dt 2 switch-off criteria during battery formation battery voltage check applications portable power tools laptop/notebook personal computer cellular/cordless phones emergency lighting systems hobby equipment camcorder package: dip18, so20 gradient d 2 v/dt 2 and dv 5 (5) sync r phase control 18 (20) 17 (19) 16 (18) power supply v s = 8 to 26 v trigger output v i power - on control v ref 6.5 v/10 ma 14 (15) oscillator 160 mv ref temp. control t max sensor battery detection v ref = 5 v status control scan path v batt monitor 0.1 to 4 v charge break output control unit 13 (14) 12 (13) 11 (12) 3 (3) 10 (11) 6 (6) 7 (8) 8 (9) 9 (10) 4 (4) 1 (1) 15 (17) 2 (2) 94 8585 c ( ) so 20, pins 7 and 16 nc figure 1. block diagram
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 2 (17) pinning package: dip18 18 10 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 output gnd led2 led1 93 7723 e v i t p v sync c r v ref osc s tm. v s v batt op o op i t max sensor package: so20 18 10 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 output gnd led2 led1 94 8594 20 19 v i op o t p nc v batt s tm. osc v ref r c v sync v s nc op i t max sensor pin description pin symbol function 1 output trigger output 2 gnd ground 3 led2 display output agreeno 4 v i phase angle control input voltage 5 op o operational amplifier output 6 op i operational amplifier input 7 t max maximum temperature 8 sensor temperature sensor 9 t p charge break output 10 v batt battery voltage 11 led1 led display output aredo 12 s tm. test mode switch (status control) 13 osc oscillator 14 v ref reference output voltage 15 v s supply voltage 16 r ramp current adjustment resistance 17 c ramp voltage capacitance 18 v sync. mains synchronisation input pin symbol function 1 output trigger output 2 gnd ground 3 led2 display output agreeno 4 v i phase angle control input voltage 5 op o operational amplifier output 6 op i operational amplifier input 7 nc not connected 8 t max maximum temperature 9 sensor temperature sensor 10 t p charge break output 11 v batt battery voltage 12 led1 led display output aredo 13 s tm. test mode switch (status control) 14 osc oscillator 15 v ref reference output voltage 16 nc not connected 17 v s supply voltage 18 r ramp current adjustment resistance 19 c ramp voltage capacitance 20 v sync. mains synchronisation input
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 3 (17) sync j r j c phase control 18 17 16 power supply v s = 8 to 26 v trigger output v j i power on control v ref 6.5 v/10 ma 14 oscillator 160 mv ref temp. control t max sensor battery detection v ref = 5 v status control scan path v batt monitor 0.1 to 4 v charge break output control unit gradient d 2 v/dt 2 & dv 13 12 11 3 10 5 6 7 8 9 4 94 8674 r 3 2.2 k r 13 100 k r 4 560 k c 3 10 nf c 2 0.22 f r 0 270 k c 0 10 nf red d 7 d 8 green c 6 0.1 f 10 k r 2 d 1 10 1 d 4 d 5 d 2 d 3 th1 th2 mains d 6 r 10 r 11 560 2x r 9 r 8 1 k r 7 1 k bc 308 t 1 r 1 1 k r 5 c 1 470 f r b1 10 k c r 1 f r 6 10 k c 4 r t3 24 k 0.1 f c 8 r t2 100 k r t1 to v ref (pin 14) r b2 c 7 4.7 f r b3 ntc dc 0.2 battery (4 cells) to pin 4 from r t1 / r t2 15 2 1 k 16 k r sh 160 mv 12 k i charge 1 f 10 k v s v s from pin 15 figure 2. block diagram with external circuit (dip pinning)
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 4 (17) general description the integrated circuit, U2402B-B, is designed for charg- ing nickel-cadmium (nicd) and nickel-metal-hydride (nimh) batteries. fast charging results in voltage lobes when fully charged (figure 3). it supplies two identifica- tions ( i. e., + d 2 v/dt 2 , and dv ) to end the charge operation at the proper time. as compared to the existing charge concepts where the charge is terminated after voltage lobes according to dv and temperature gradient identification, the u2402b takes into consideration the additional changes in positive charge curves, according to the second deriva- tive of the voltage with respect to time (d 2 v/dt 2 ). the charge identification is the sure method of switching off the fast charge before overcharging the battery. this helps to give the battery a long life by hindering any marked in- crease in cell pressure and temperature. even in critical charge applications, such as a reduced charge current or with nimh batteries where weaker charge characteristics are present multiple gradient con- trol results in very efficient switch-off. an additional temperature control input increases not only the performances of the charge switching character- istics but also prevents the general charging of a battery whose temperature is outside the specified window. a constant charge current is necessary for continued charge-voltage characteristic. this constant current regu- lation is achieved with the help of internal amplifier phase control and a simple shunt-current control technique. all functions relating to battery management can be achieved with dc-supply charge systems. a dc-dc-con- verter or linear regulator should take over the function of power supply. for further information please refer to the applications. shorted batteries ignored 93 7694 e check battery insertion battery monitoring voltage dv 5 v formation battery dv t d 2 v dt 2 t 2 10 min v 10 dv, d 2 v dt 2 , active t 1 = 5 min fast charge rate i o top off charge rate 1/4 i o trickle charge rate 1/16 i o gradient recognition figure 3. charge function diagram, f osc = 800 hz
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 5 (17) flow chart explanation, f osc = 800 hz (figures 2, 3 and 4) battery pack insertion disables the voltage lock at battery detection input pin 10. all functions in the integrated cir- cuit are reset. for further description, dip-pinning is taken into consideration. battery insertion and dv monitoring the charging procedure will be carried out if battery in- sertion is recognised. if the polarity of the inserted battery is not according to the specification, the fast charge rate will stop immediately. after the polarity test, if positive, the defined fast charge rate, i o , begins for the first 5 min- utes according to dv monitoring. after 5 minutes of charging, the first identification control is executed. if the inserted battery has a signal across its terminal of less than 0.1 v, then the charging procedure is interrupted. this means that the battery is defective i.e., it is not a re- chargeable battery ashorted batteries ignoredo. voltage and temperature measurements across the battery are carried out during charge break interval (see figure 6), i.e., currentless or idle measurements. if the inserted battery is fully charged , the dv control will signal a charge stop after six measurements (approxi- mately 110 seconds). all the above mentioned functions are recognised during the first 5 minutes according to dv method. during this time, +d 2 v/dt 2 remains inactive. in this way the battery is protected from unnecessary dam- age. d 2 v/dt 2 -gradient if there is no charge stop within the first 5 minutes after battery insertion, then d 2 v/dt 2 monitoring will be active. in this actual charge stage, all stop-charge criteria are ac- tive. when close to the battery's capacity limit, the battery voltage curve will typically rise. as long as the +d 2 v/dt 2 stop-charging criteria are met, the device will stop the fast charge activities. top-off charge stage by charge disconnection through the + d 2 v/dt 2 mode, the device switches automatically to a defined protective top- off charge with a pulse rate of 1/4 i o (pulse time, t p = 5.12 s, period, t = 20.48 s). the top-off charge time is specified for a maximum time of 10 minutes @ 800 hz. a voltage drop during top-off charge leads to the dv switch-off. trickle charge stage when top-off charge is terminated, the device switches automatically to trickle charge with 1/16 i o (t p = 320 ms, period = 5.12 s). the trickle continues until the battery pack is removed. basic description power supply, figure 2 the charge controller allows the direct power supply of 8 v to 26 v at pin 15.internal regulation limits higher in- put voltages. series resistance, r 1 , regulates the supply current, i s , to a maximum value of 25 ma. series resis- tance is recommended to suppress the noise signal, even below 26 v limitation. it is calculated as follows. r 1min v max 26 v 25 ma r 1max v min 8v i tot where i tot = i s + i rb1 + i 1 v max, v min = rectified voltage i s = current consumption (ic) without load i rb1 = current through resistance, r b1 i 1 = trigger current at pin 1
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 6 (17) dv disconnection no led1 blinking charge stop no led1 on led2 off led1 on yes no led2 blinking cell insertion cell insertion reset no no yes yes yes no no yes led2 on cell in range ? temperature permissible yes power on reset yes no start turn on cell charging time reaches 5 min. ? no yes no yes inserted ? led2 on no led2 on yes yes yes cell in range ? temperature permissible charging starts with - dv monitoring dv switch off dv and d 2 v/dt 2 monitoring begins cell in range ? temperature permissible dv disconnect ? d 2 v/dt 2 disconnect ? trickle charging with 1/16 i o top-off charging with 3/8 i o 93 7696 e timer 5 min exceeded *) 70 mv > v batt < 5 v *) cell inserted ? *) cell inserted ? *) cell inserted ? *) figure 4. flow chart
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 7 (17) battery voltage measurement the battery voltage measurement at pin 10 (adc-con- verter) has a range of 0 v to 4 v, which means a battery pack containing two cells can be connected without a voltage divider. precaution should be taken that under specified charge current conditions, the final voltage at the input of the converter, pin 10, should not exceed the threshold voltage level of the reset comparator, which is 5 v. when the bat- tery is removed, the input (pin 10) is terminated across the pulled-up resistance, r b1, to the value of 5 v-reset- threshold. in this way, the start of a new charge sequence is guaranteed when a battery is reinserted. if the battery voltage exceeds the converter range of 4 v, adjusting it by the external voltage divider resistance, r b2 and r b3 is recommended. value of the resistance, r b3 is calculated by assuming r b1 = 1 k , r b2 = 10 k , as follows: r b3 r b2 v 10max v bmax v 10max the minimum supply voltage, v smin , is calculated for re- set function after removing the inserted battery according to: v smin 0.03ma r b3 r b1 r b2 5v r b1 r b2 r b3 r b3 where: v 10max = max voltage at pin 10 v smin = min supply voltage at the ic (pin 15) v bmax = max battery voltage the voltage conditions mentioned above are measured during charge current break (switch-off condition). 7 v dac control comparator comparator 10 v recognition v dac v dac r b1 r b2 r b3 v 6 battery r sh v s 94 8681 + + 15 v ref =18 mv v ref = 4.3 v v ref = 0.1 v reset i ch + = v batt reset t r v b figure 5. input configuration for the battery voltage measurement table 1. valid when v 10max = 3.5 v cell no. 1 2 3 4 5 6 7 8 9 10 11 12 v smin (v) 8 8 8 9 11 13 15 17 19 21 23 25 r b3 (k 51 16 10 7.5 5.6 4.7 3.9 3.3 3 2.7
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 8 (17) analog-digital-converter (adc), test sequence a special analog-digital-converter consists of a five-bit coarse and a five-bit fine converter . it operates by a linear count method which can digitalize a battery voltage of 4 v at pin 10 in 6.5 mv steps of sensitivity. in a duty cycle, t, of 20.48 s, the converter executes the measurement from a standard oscillation frequency of f osc = 800 hz. the voltage measurement is during the charge break time of 2.56 s (see figure 6), i.e., no-load voltage (or currentless phase). therefore it has optimum measurement accuracy because all interferences are cut- off during this period (e.g., terminal resistances or dynamic load current fluctuations). after a delay of 1.28 s the actual measurement phase of 1.28 s follows. during this idle interval of cut-off condi- tions, battery voltage is stabilized and hence measurement is possible. an output pulse of 10 ms appears at pin 9 during charge break after a delay of 40 ms. the output signal can be used in a variety of way, e.g., synchronising the test control (reference measurement). plausibility for charge break there are two criterian considered for charge break plau- sibility: dv cut-off when the signal at pin 10 of the da converter is 18 mv below the actual value, the comparator identifies it as a voltage drop of dv. the validity of dv cutt-off is con- sidered only if the actual value is below 18 mv for three consective cycles of measurement. d 2 v/dt 2 cut-off a four bit forward/ backward counter is used to register the slope change (d 2 v/dt 2 , v batt slope). this counter is clocked by each tracking phase of the fine ad-counter. beginning from its initial value, the counter counts the first eight cycles in forward direction and the next eight cycles in reverse direction. at the end of 16 cycles, the ac- tual value is compared with the initial value. if there is a difference of more than two lsb-bit (13.5 mv) from the actual counter value, then there is an identification of slope change which leads to normal charge cut-off. a se- cond counter in the same configuration is operating in parallel with eight clock cycles delay, to reduce the total cut-off delay, from 16 test cycles to eight test cycles. 2.56 s t= 20.48 s t 10 ms 40 ms t t 1.28 s 1.28 s pin 9 charge break output status adc conversion time (internal) 94 8693 charge charge break figure 6. operating sequence of voltage measurements
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 9 (17) temperature control, figure 7 when the battery temperature is not inside the specified temperature windows , the overal temperature control will not allow the charge process. sensor short circuit or inter- ruption also leads to switch-off. differentiation is made whether the battery exceeds the maximum allowable temperature, t max , during the charge phase or the battery temperature is outside the temperature window range before battery connection. a permanent switch-off follows after a measurement pe- riod of 20.48 s, if the temperature exceeds a specified level, which is denoted by a status of a red led 1 . a charge sequence will start only when the specified window tem- perature range is attained. in such a case, the green led 2 starts blinking immediately showing a quasi charge readiness , even though there is no charge current flow. the temperature window is specified between two volt- age transitions. the upper voltage transition is specified by the internal reference voltage of 4 v, and the lower voltage transition is represented by the external voltage divider resistances r t2 and r t3 . ntc sensors are normally used to control the temperature of the battery pack. if the resistance values of ntc are known for maximum and minimum conditions of allow- able temperature, then other resistance values, r t1 , r t2 and r t3 are calculated as follows: suppose r t2 = 100 k , then r t1 r ntcmax v ref 4v 4v r t3 r ntcmin r t2 r t1 if ntc sensors are not used, then select the circuit config- uration according to figure 10. 7 v 7 r t2 r t3 14 + 7 v r t1 ntc sensor 8 94 8682 v ref v ref = 4 v high temperature low temperature + sensor v ref t max figure 7. temperature window
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 10 (17) current regulation via phase control (figure 8) phase control an internal phase control monitors the angle of current flow through the external thyristors as shown in figure 2. the phase control block represents a ramp generator syn- chronised by mains zero cross over and a comparator. the comparator will isolate the trigger output, pin 1, until the end of the half wave (figure 8) when the ramp voltage, v ramp, reaches the control voltage level, v i, within a mains half wave. charge current regulation (figure 2) according to figure 2 the operational amplifier (opamp) regulates the charge current, i ch (= 160 mv / r sh ), aver- age value. the opamp detects the voltage drop across the shunt resistor (r sh ) at input pin 6 as an actual value. the actual value will then be compared with an internal refer- ence value (rated value of 160 mv). the regulator's output signal, v 5, is at the same time the control signal of the phase control, v i (pin 4). in the ad- justed state, the opamp regulates the current flow angle through the phase control until the average value at the shunt resistor reaches the rated value of 160 mv. the corresponding evaluation of capacitor c r at the op- erational amplifier (regulator) output determines the dynamic performance of current regulation. internal zero pulse current flow angle 6v 0ms 10ms 20ms 30ms 100mv 93 7697 e f mains = 50 hz v sync (pin 18) ramp voltage (pin 17) v i v i v i trigger output (pin 1) figure 8. phase control function diagram
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 11 (17) status control status control inside and outside the charging process are designated by led 1 and led 2 outputs given in the table below: led1 (red) led2 (green) status off on no battery, top off charge, trickle charge off blinking quick charge, temperature out of the window before battery insertion or power on on off temperature out of the window blinking off battery break (interrupt) or short circuit the blink frequency of led outputs can be calculated as follows: f (led) oscillator frequency, f osc 1024 oscillator time sequences regarding measured values and evalua- tion are determined by the system oscillator. all the technical data given in the description are with the stan- dard frequency 800 hz. it is possibe to alter the frequency range in a certain li- mitation. figure 9 shows the frequency versus resistance curves with different capacitance values. oscillation frequency adjustment recommendations: 0.5c charge 0.5 500 hz = 250 hz 1c charge 500 hz 2c charge 2 500 hz = 1000 hz 3c charge 3 500 hz = 1500 hz 0.1 1 10 100 1000 10000 r ( k ) o f 0 ( khz ) 10 95 11408 c 0 =2.2nf c 0 =4.7nf c 0 =10nf figure 9. frequency versus resistance for different capacitance values
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 12 (17) absolute maximum ratings reference point pin 2 (gnd), unless otherwise specified parameters symbol value unit supply voltage pin 15 v s 26 v voltage limitation i s = 10 ma v s 31 v current limitation pin 15 t < 100 s i s 25 100 ma voltages at different pins 1, 3 and 11 pins pins 4 to 10, 12 to 14 and 16 to 18 v 26 7 v currents at different pin 1 pins pins 3 to 14 and 16 to 18 i 25 10 ma power dissipation t amb = 60 c p tot 650 mw ambient temperature range t amb 10 to 85 c junction temperature t j 125 c storage temperature range t stg 40 to 125 c thermal resistance parameters symbol maximum unit junction ambient r thja 100 k/w electrical characteristics v s = 12 v, t amb = 25 c, reference point pin 2 (gnd), unless otherwise specified. parameters test conditions / pins symbol min. typ. max. unit power supply pin 15 voltage range v s 8 26 v power-on threshold on off v s 3.0 4.7 3.8 5.7 v v current consumption without load i s 3.9 9.1 ma reference pin 14 reference voltage i ref = 5 ma i ref = 10 ma v ref 6.19 6.14 6.5 6.5 6.71 6.77 v v reference current i ref 10 ma temperature coefficient tc 0.7 mv/k operational amplifier op output voltage range i 5 = 0 pin 5 v 5 0.15 5.8 v output current range v 5 = 3.25 v pin 5 i 5 80 a output pause current pin 5 i pause 100 a non-inverting input voltage pin 6 v 6 0 5 v non-inverting input current pin 6 i 6 0.5 a
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 13 (17) parameters test conditions / pins symbol min. typ. max. unit comparator or temperature control input current pin 7, 8 i 7, 8 0.5 0.5 a input voltage range pin 7, 8 v 7, 8 0 5 v threshold voltage pin 8 v 8 3.85 4.15 v charge break output pin 9 output voltage high, i 9 = 4 ma low, i 9 = 0 ma v 9 8.4 100 v mv output current v 9 = 1 v i 9 10 ma battery detection pin 10 analog-digital converter conversion range full scale level v batt 0 3.85 4.0 v input current 0.1 v v batt 4.5 v i batt 0.5 a input voltage for reset v batt 4.8 5.0 5.3 v input current for reset v batt 5 v i batt 8 35 a battery detection maximum voltage v batt 80 120 mv hysteresis maximum voltage v hys 15 mv mode select pin 12 threshold voltage test mode v 12 4.7 v input current normal mode open i 12 20 0 sync. oscillator pin 13 frequency r = 150 k c = 10 nf f osc 800 hz threshold voltage high level low level v t(h) v t(l) 4.3 3% 2.2 3% v input current i 13 0.5 0.5 a phase control ramp voltage r = 270 k pin 16 v 16 2.9 3.9 v ramp current i 16 0 100 ramp voltage range v 17 0 5 v ramp discharge current i 17 3.3 8 ma synchronisation pin 18 minimum current v sync 80 mv i sync 10 2 a maximum current v sync = 0 v i sync 15 30 a zero voltage detection v sync 83 100 135 mv hysteresis v hys 15 mv charge stop criteria (function) pin 10 positive gradient-turn-off threshold f osc = 800 hz d 2 v/dt 2 4.8 mv/ min 2 dv-turn-off threshold dv 18 mv
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 14 (17) r t1 10 r 1 r b1 1 k r b2 10 k r b3 16 k output 1 v sync 18 v batt sensor 10 8 ntc lm358 battery c 8 0.1 f s tm 6 12 k c 4 1 f r 6 10 k 15 v s c 1 2 220 f led1 16 j r j c 17 5 op o 4 14 v j i v ref 11 tlhr5400 led2 3 tlhg5400 green ready r 5 1 k 7 t max r t2 100 k r t3 24 k 9 12 t p 13 osc r o 270 k c o 10 nf 94 8733 op i gnd r 15 100 k r 13 100 k r 14 100 k r 12 100 k c 4 4.7 f i ch = 0...16 v/ r sh 0.2 / 1 w l 1 200 h c 3 47 f d 1 byv27/50 c 10 10 f 8 v to r sh + red temp 1 k r 2 1 k r 3 t1 c r 1 f r 4 22 k c 3 1 nf bd646 t2 bc237 t3 r 7 10 k r 8 10 k r 10 10 k r 11 4.7 k r 16 1 k d 2 1n4148 c 2 0.22 f r 9 10 k t4 bc308 4 8 / v s + 26 v r 17 1k 1 a x) x) manufacturer pikatron d 3 byv27/50 figure 10. car battery supplied charge system with high side current detection for four nicd/nimh cells @ 800 ma
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 15 (17) 2.2 k d 2 d 3 th1 t6 d 5 r 11 560 r 9 10 k 1 k bc 308 red temp byt86 r 10 560 c 7 4.7 c 6 d 6 r 8 t 1 r t1 4148 r 2 100 k r 3 r 13 r 7 10 k 1 k 4148 d 1 10 0.1 r 1 r b1 1 k r b2 10 k r b3 16 k output 1 v sync 18 v batt sensor 10 8 ntc r 22 10 k c 10 0.1 r 23 10 k bc 308 r 24 10 k bc 307 bc 307 t3 d 10 t4 4148 d 11 4148 r 25 6.2 k s1 r 29 10 k r 21 1 k r 20 10 / 4 w 0.1 t2 bd 649 battery 4148 th2 d 4 4148 c 8 0.1 s 6 12 k c 4 1 r 6 10 k 15 v s c 1 2 220 led2 16 r r 4 560 k 17 10 nf c 3 c r 5 4.7 op o 4 14 v i v ref 11 tlhg5400 led1 3 tlhr5400 green ready r 5 1 k 7 t max r t2 100 k r t3 24 k 9 12 t p 13 osc r o 270 k c o 10 nf 94 8734 op i gnd c 2 0.22 mains d 12 4148 v batt (pin 10) t5 r 28 r 26 r 27 10 k 10 k 1 k r sh = 0.16 v/i ch i ch c f f f f f f f f bc 308 sensor (pin 8) d 13 d 14 d , 13 d = 1n4148 14 figure 11. standard application with predischarge for 8 nicd/nimh cells @ 1600 ma
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 16 (17) dimensions in mm package: dip18 94 8877 package: so20
U2402B-B telefunken semiconductors rev. a2, 21-mar-96 17 (17) 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

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