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| U842B Wiper Control for Intermittent and Wipe/ Wash Mode Description The U842B circuit is designed as an interval and wipe/ wash timer for automotive wiper control. The interval pause can be set in a range from 3 s to 11 s by an external 1-kW potentiometer. Wipe/wash mode has priority over the interval mode. The U842B controls the wiper motor with/without park switch signal. The integrated relay driver is protected against short circuits and is switched to conductive condition in the case of a load-dump. With only a few external components, protection against RF interference and transients (ISO/TR 7637-1/3) can be achieved. Features D Interval input: low side D Wipe/ wash input: low side D Park input: high side (park position) D Output driver protected against short circuit D All time periods determined by RC oscillator D Fixed relay activation time of 500 ms D Adjustable interval pause from 3 s to 11 s D Fixed pre-wash delay of 400 ms D Dry wiping - With park switch signal: 3 cycles - Without park switch signal: 2.8 s D Inputs INT, WASH and PARK digitally debounced D All inputs with integrated RF protection D Load-dump protection and interference protection according to ISO 7637-1/3 (DIN 40839) Application Digital interval wipe-wash control for rear or front wiper Ordring Information Extended Type Number U842B U842B-FP Package DIP8 SO8 Remarks Pin Description Pin 1 2 3 4 5 6 7 8 Symbol INT WASH PARK PAUS OSC VS GND OUT Function Interval input Wipe/ wash input Park switch input Pause time adjust Oscillator input Supply voltage Ground Relay output 13300 INT 1 8 OUT WASH PARK PAUS 2 7 GND U842B 3 6 Vs OSC 4 5 Figure 1. Pinning Rev. A4, 26-Mar-01 1 (12) U842B Block Diagram VS 6 GND 7 21 V 1/2 VS Stabilization POR Load-dump - detection 28 V 8 OUT INT 1 + - 250 mV + - 25 pF 21 V WASH 2 + - Logic 0.5 25 pF 21 V PARK 3 + - VS + - 25 pF 4 PAUS Figure 2. Block diagram 21 V 5 OSC 13287 Oscillator 25 pF 21 V OUT Upper switching point 21 V Basic Circuit Power Supply For reasons of interference protection and surge immunity, an RC circuitry has to be provided to limit the current, and to supply the integrated circuit in the case of supply voltage drops. Suggested values: R1 = 180 W, C1 = 47 mF, (see figure 2) The supply (Pin 6) is clamped with a 21-V Zener diode. The operation voltage ranges between VBatt = 9 V to 16 V. The capacitor, C1, can be dimensioned smaller (typically: 10 mF) if a diode is used in the supply against reversed battery. In this case of negative interference pulses, there is only a small discharge current of the circuit. Oscillator All timing sequences in the circuit are derived from an RC oscillator which is charged by an external resistor, R9, and discharged by an integrated 2-kW resistor. The basic frequency, f0, is determined by the capacitor, C2, and an integrated voltage divider. The basic frequency is adjusted to 320 Hz (3.125 ms) by C2 = 100 nF and R9 = 220 kW. The tolerances and the temperature coefficients of the external components determine the precision of the oscillator frequency. A 1% metallic-film resistor and a 5% capacitor are recommended.. The debouncing times of the inputs, the turn-on time of the relay (t5), the pre-wash delay (t1), the dry wiping time (t2) and the debouncing time (t7, short circuit detection) depend on the oscillator frequency (f0) as shown in table 1. 2 (12) Rev. A4, 26-Mar-01 U842B VBatt R1 180 R9 220 k C1 47 F 8 7 6 5 C2 100 nF U842B 1 R4 10 k Switch INT Button WASH PARK Figure 3. Basic cicuitry R5 47 k 2 3 R6 10 k R11 360 VR1 1 k 4 R7 1.5 k 13288 Table 1 Timing Variable Debouncing Times t5 t2 t6 = = = 160 1/f0 896 1/f0 or 3 cycles 872 1/f0 8 1/f0 1/f0 1/f0 1/f0 1/f0 1/f0 Debouncing is basically done by counting oscillator clocks starting with the occurance of any input signal. Caused by the asynchronism of input signal and IC-clock, the debouncing time may vary in a certain range. Figure 4 shows the short circuit debouncing as an example: During the relay activation, a comparator monitors the output current at each positive edge of the clock to load a 3-stage shift register in the case of a detected short circuit condition i.e., I > 500 mA. With the third edge, the output stage is disabled. Dependent on the short circuit occurence the delay time may range from 2 to 3 clock cycles. The timing can be adjusted by variation of the external frequency-determining components (R/C). The potentiometer at Pin 4 determines the interval pause, which can be varied by adjusting the upper charging threshold of the oscillator. For all other time periods, an internal voltage divider determines the upper charging threshold of the oscillator (see figure 3). Fixed: Relay activation time Dry wiping Interval pause Switch-on delay INT Variable: Debouncing time INT Debouncing time WASH 1. pre-wash delay 2. reverse debouncing Debouncing time PARK Debouncing time SC t1 t8 t7 = = = 112 to 128 16 to 32 6 to 8 2 to 3 t1.R = t4 = 24 to 32 t4D = Rev. A4, 26-Mar-01 3 (12) U842B Wipe/ Wash Operation CL 0 ON 1 2 3 OUT OFF IC>500mA Relay Output The relay output is an open collector Darlington transistor with an integrated 28-V Z-diode for limitation of the inductive cutout pulse of the relay coil. The maximum static collector current must not exceed 300 mA and the saturation voltage is typically 1.2 V for a current of 200 mA. The collector current is permanently measured by an integrated shunt, and in the case of a short circuit (IC > 500 mA) to Vbat, the relay output is stored disabled. The short circuit buffer is reset by opening the INT and WASH switches. As long as the short condition exists a further activation of these switches will disable the output stage again. Otherwise the normal wipe operation is performed. In order to avoid short-term disabling caused by current pulses of transients, a 10 ms debounce period (t7) is provided (see figure 4). During a load-dump pulse, the output transistor is switched to conductive condition to prevent destruction. The short circuit detection is suppressed during the loaddump. Interference Voltages and Load-dump The IC supply is protected by R1, C1 and an integrated 21-V Z-diode. The inputs are protected by a series resistor, integrated 21-V Z-diode and RF capacitor. The RC-configuration stabilizes the supply of the circuit during negative interference voltages to avoid power-on reset (POR). 4 (12) EEEEE EEEEE SC t7 13301 Figure 4. The debouncing of the short circuit detection The relay output is protected against short interference peaks by an integrated 28-V Z-diode. During load-dump, the relay output is switched to conductive condition if the battery voltage exceeds approximately 30 V. The output transistor is dimensioned so that it can absorb the current produced by the load-dump pulse. Power-on Reset When the operating voltage is switched on, an internal power-on reset pulse (POR) is generated which sets the logic of the circuits to defined initial condition. The relay output is disabled, the short circuit buffer is reset. Functional Description Interval Function The circuit is brought to its interval mode with the input switch INT operated for more than 625 ms (t > t4 + t4D +t5). This time includes: - 100 ms debounce time t4 - 25 ms INT switch-on delay t4D - 500 ms relay activation time t5 If the INT input is toggled for 125 ms < t < 625 ms, the relay activation time t5 lapses anyway and the wiper performs one turn. To enable correct interval functioning, the INT input has to be activated afterwards as described. The beginning of the interval pause depends on the application with or without wiper motor park switch (see figures 5, 6, 7 and 8). Rev. A4, 26-Mar-01 U842B Interval Function with Park-Switch Feedback During the relay activation time the wiper motor leaves its park position and the park switch changes its potential from VBatt to GND. After the relay is switched off the wiper motor is supplied via the park switch until the park position is reached again. The park switch changes its potential from GND back to VBatt. With the park switch connected to the park input (Pin 3) the interval pause t6 starts after the 25 ms debounce time (t8) is over (see figures 5 and 6). Wiper motor Wash pump M R2 1.5 k R3 1.5 k R4 INT 1 10 k R5 2 47 k R6 3 10 k R11 360 4 R7 1.5 k 13289 R1 180 8 7 Park M Run WASH SETINT VR1 1 k U842B 6 R9 220 k 5 C1 47 F C2 100 nF Figure 5. Application circuit with park switch feedback INT VBatt 0V t4 t 4D OUT VBatt 0V t5 t6 t 4D PARK VBatt 0V ON t8 MOTOR OFF 13302 Figure 6. Intermittent circuit function with park position feedback Rev. A4, 26-Mar-01 5 (12) U842B Interval Function without Park-Switch Feedback If the park input of the circuit is not connected with the park switch of the wiper motor (see figure 7), the interval pause starts directly after the turn-on time of the relay is over (see figure 8). Wiper motor Wash pump M R2 1.5 k R3 1.5 k R4 INT 1 10 k R5 2 47 k 3 R11 4 1 k 5.1 k R7 20 k Figure 7. Application circuit without park position feedback 5 C1 47 F C2 100 nF 13290 R1 180 8 Park M Run WASH SETINT VR1 7 U842B 6 R9 220 k V INT Batt 0V t4 t 4D V Batt 0V t5 OUT t6 t 4D V PARK Batt 0V ON MOTOR OFF 13303 Figure 8. Intermittent circuit function without park position feedback 6 (12) Rev. A4, 26-Mar-01 U842B WASH V Batt 0V t 1R t1 t7 wipe1 wipe2 wipe3 OUT 0V PARK V Batt 0V ON MOTOR OFF 13304 Figure 9. Wash operation with park switch signal After operating the WASH switch, the relay is activated after the debounce time, t1. As long as the switch is pushed, water is sprayed on the windscreen by the wash pump. When it is released, the dry wiping starts after 100 ms reverse debouncing (t1R). Wipe/ Wash Mode with Park Position Feedback If the park input of the circuit is connected to the park switch, the dry wiping lasts three full wipe cycles (see V Batt figure 9). During the third cycle, the wiper motor is supplied via the park switch because the relay driver is switched off after the second cycle. Wipe/ Wash Mode without Park Position Feedback If U842B is used without the wiper motor's park switch, Pin 3 stays at high potential via its integrated pull-up resistor. Therefore, the driver stage switches off after the fixed dry wiping time t2. WASH 0V V Batt t1 0V V Batt 0V ON t 1R t2 PARK MOTOR OFF 13305 Figure 10. Wash operation without park signal report Rev. A4, 26-Mar-01 7 (12) U842B Wipe/ Wash Mode Priority The wipe/wash mode has priority over the interval mode - therefore the interval function is interrupted as soon as the WASH switch is operated longer than the debounce time t1. With or without park switch feedback, after relay V Batt activation time is over (no park switch feedback), or after the third wipe (park switch feedback), the interval mode is continued with an interval pause t6 (see figures 11 and 12). WASH 0V V Batt 0V V Batt 0V t 4D INT OUT t5 t6 PARK V Batt 0V ON OFF 13306 MOTOR Figure 11. Wipe/ wash priority with park position feedback V Batt WASH 0V INT V Batt 0V V Batt 0V t 4D OUT t5 t2 t6 PARK V Batt 0V ON MOTOR OFF 13307 Figure 12. Wash/ wipe priority without park position feedback 8 (12) Rev. A4, 26-Mar-01 AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AA AAAA A A A A AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AA AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AA AAAA A A A A A AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAA AAAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA AAA AAA AAA AAAAAAA AAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA VBatt = 13.5 V, Tamb = 25C, reference point ground (Pin 7), circuit with recommended external circuitry (see fig. 2) AAAA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAAAAAA AA Thermal Resistance Thermal resistance Maximum junction temperature Parameters DIP8 SO8 Symbol Rthja Rthja Tj Maximum 120 160 150 K/W K/W Unit AAAA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAAAAAA AA AA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA AA A A AA AAAA AAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAAAA AAAAAAAAAAAAAAAA AA Absolute Maximum Ratings Storage temperature range t = 60 s t = 600 s Ambient temperature range Supply voltage Parameters Symbol VBatt VBatt Tamb Tstg -55 to +150 24 18 -40 to +100 Value Rev. A4, 26-Mar-01 Electrical Characteristics Threshold Internal capacitance Protective diode WASH input External series resistance Pull-up resistance Threshold Internal capacitance Protective diode PARK input External series resistance Pull-up resistance Threshold Internal capacitance Protective diode INT input Internal Z-diode Filter capacitance Series resistance Undervoltage threshold POR Supply currrent Supply-voltage range Supply Parameters I2 = 10 mA I3 = 10 mA I1 = 10 mA I6 = 10 mA Test Conditions / Pin Pin 1 Pin 2 Pin 3 Symbol VBatt V2 V2 RS V3 V3 RS V1 V1 V6 V6 C2 R3 C3 R1 C1 C1 R1 I6 Min 9 0.5 0.5 0.5 Typ 180 3.5 25 21 10 20 25 21 10 20 25 21 21 47 V6 V6 V6 Max 16 U842B 3 Unit C C C V V Unit mA kW kW kW kW mF pF pF pF 9 (12) W V V V V V V V V V AAAA A A A A A A A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAA A A A A A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A AAAA A A A A A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA A AAAA A A A A AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A AA A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAAA AAAAAAAA AAAAA A AAAA A A A A AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA A AAAA A A A A AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A AAAA A A A A A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A AAAA A A A A A A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAA A AAAAAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAAAAAAAAAAA AAAAAAA AAAAAAAA AAAA A VBatt = 13.5 V, Tamb = 25C, reference point ground (Pin 7), circuit with recommended external circuitry (see fig. 2) Electrical Characteristics (continued) U842B 10 (12) With park switch feedback Without park switch feedback Dry wiping Interval pause Switch-on delay (interval mode) Relay activation time Debouncing times: INT input WASH input Pre-wash delay Reverse delay Park Short circuit Times External circuitry - see oscillator input (figure 3) Protective diode Internal discharge resistance Upper switching point Lower switching point Basic frequency Oscillator resistor Oscillator capacitor Oscillator input Short circuit regulation Output pulse current, load dump Internal Z-diode Leakage current Output current Relay coil resistance Saturation voltage Saturation voltage Relay output Internal capacitance Protective diode PAUS input External series resistance Pull-up resistance Parameters VF = forward voltage External 1 kW pot. I8 = 10 mA I8 = 200 mA I8 = 100 mA I4 = 10 mA Test Conditions / Pin Pins 5 and 6 Pin 5 Pin 8 Pin 4 Pin 5 Symbol RRel t1 t1,R t8 t7 t4D V5 V5 V5 V8 V8 V8 V4 RS R5 R8 C2 C4 R2 f0 I8 I8 I8 I8 t2 t6 t5 t4 0.2 2.25 Min 400 500 260 50 14 5 2.1 18 50 60 V6 VS + VF 0.07 V6 Typ 320 220 100 100 1.2 1.0 28 25 21 47 3 2 0.5 Rev. A4, 26-Mar-01 13.75 Max 625 540 125 37 12 125 300 3.5 1.5 31 10 V6 wipes Unit mA mA kW kW kW kW mA ms ms ms ms ms ms ms Hz nF pF W V V V V A V V V s s U842B Package Information Package DIP8 Dimensions in mm 9.8 9.5 1.64 1.44 7.77 7.47 4.8 max 6.4 max 0.5 min 0.58 0.48 7.62 8 5 2.54 3.3 0.36 max 9.8 8.2 technical drawings according to DIN specifications 13021 1 4 Package SO8 Dimensions in mm 5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7 technical drawings according to DIN specifications 13034 1 4 Rev. A4, 26-Mar-01 11 (12) U842B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany 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. Atmel Germany GmbH 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. Atmel Germany GmbH 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 Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 12 (12) Rev. A4, 26-Mar-01 |
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