U2640B

U2640B ATMEL | Alldatasheet

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Technical content

Features

Relay activation can be controlled by a limit switch of the wiper motor or by a fixed activation period for systems without limit switch Debounced input stages Enable/disable of pre-wash delay by program pin Polarity of WIW A: V Batt Polarity of INT: V Batt Relay output is protected with a clamping diode Relay activation: 0.48 s Interval pause: 5.8 s After wiping: 5.2 s Pre-wash delay: 0.52 s Wipe/wash mode with priority Protected in accordance to ISO/TR 7637–1 EMC with intergrated filters Block Diagram 21 V 21 V 21 V 21 V Input comparator V oltage stabilization and POR Logic Load- dump detection and output control Oscillator 21 V Open-collector relay driver V S OSC INT WIW A LS PP GND REL 13944 Figure 1. Block diagram

Ordering Information

Extended Type Number Package Remarks U2640B DIP8 U2640B–FP SO8

1 INT Intermittent input

2 WIWA Wipe/wash (WIW A) input

3 LS Limit switch (wiper motor) input

4 PP Program pin

5 GND Ground

6 REL Relay output

7 V S Supply voltage

8 OSC RC oscillator input

Figure 2. Pinning interval switch was opened beforehand. results in the relay on-time, tON , after tD . the motor current flows via the relay contact only. tDEL can be selected by programming PP . The after-wiping time, tAW , is re-triggerable in both cases.

Rev. A4, 03-Apr-01 3 (10) Intermittent and Wipe/Wash Mode The wipe/wash function has priority over the interval function. If switch WIWA is closed during the interval function, wipe/wash mode is activated immediately after the debounce time, tD , even if an on-delay is programmed (tDEL = 0 s). Expiry of tAW is directly followed by the next relay on-time, tON , of intermittent mode. Oscillator All timing sequences are derived from an RC-oscillator whose charging time, t 1, is determined by an external resistor, ROSC, and whose discharging time, t2, is determinated by an integrated 2-k resistor. Since tolerance and temperature response of the integrated resistor are far higher than those of the external resistor, t 1/t2 must be selected to be greater than 20 for stability reasons. The minimum value of ROSC should not be less than 68 k. Calculating cycle duration and frequency: t = t1 + t2 = COSC ( 0.74 ROSC + 2260 ) and f OSC = 1/t Calculating the capacitor for a given resistor: C OSC = t / ( 0.74 ROSC + 2260 ) Calculating the oscillator resistance for a given capacitor: R OSC = 1.34 ( t / COSC – 2260 ) Recommended frequency: fOSC = 200 Hz (for ROSC = 200 k, COSC = 33 nF) All times can be varied jointly within specific limits by varying the oscillator frequency (see table 1). The oscilla- tor is operable up to 50 Hz. Power Supply For reasons related to protection against interference and destruction, the Pin V S must be provided with an RC net- work for limiting the current in the event of overvoltage and for buffering in the event of voltage drops. Proposed ratings: R V = 510 , CV = 47 F. An integrated 14-V Zener diode is connected between VS and GND. Interference Voltages and Load-Dump In the case of transients, the integrated Zener diode limits the voltage of the relay output to approximately 28 V . In the case of load-dump, a current (dependent upon RV and C V ) flows through the integrated 14-V Zener diode, and the relay output is switched on at VBatt > 30 V in order to avoid destruction of the output. The output transistor is rated such that it can withstand the current generated dur- ing the load-dump through the relay coil. In practice, the windscreen wiper motor is switched on via the relay and thus the amplitude of the load-dump pulse is limited. The supply voltage of the circuit is limited to 14 V by the inte- grated Zener diode, and the inputs are protected by external protective resistors and integrated Zener diodes. RF suppression is implemented with a low-pass filter at the inputs, consisting of a protective resistor and the inte- grated capacitor. Power-on Reset (POR) When the supply voltage is applied, a power-on reset pulse is generated which sets the circuit’s logic to a defined initial state. The POR threshold is approximately V S = 4.3 V . Table 1 Change in times by varying the oscillator frquency fosc (Hz) tD [ms ] tDL [ms ] tON [ms ] tINT [s] tAW [s] tDEL [s] 100 140 35 960 11.84 10.24 920 120 116 29 800 9.68 8.53 766 140 100 25 686 8.45 7.31 657 160 87 22 600 7.40 6.40 575 180 77 19 533 6.57 5.68 511 200 70 17 480 5.92 5.12 460 220 64 16 436 5.38 4.65 418 240 58 14 400 4.93 4.26 383 260 54 13 370 4.55 3.94 353 280 50 12 343 4.23 3.66 328 300 46 11 320 3.95 3.41 306 400 35 9 240 2.96 2.56 230

Rev. A4, 03-Apr-014 (10) Absolute Maximum Ratings With recommended external circuitry Parameter Test Conditions Symbol V alue Unit Supply voltage (static) 5 min V Batt 24 V Supply current pulse 2 ms IS 1.5 A Supply current pulse 300 ms IS 150 mA Relay output current (static) IREL 300 mA Relay output current pulse 300 ms IREL 1.5 A Ambient temperature range Tamb –40 to +95 °C Storage temperature range Tstg –55 to +125 °C Power dissipation DIP8 Ptot 0.45 W Power dissipation SO8 Ptot 0.34 W Thermal Resistance Parameters Symbol V alue Unit Junction ambient DIP8 R thJA 120 K/W Junction ambient SO8 R thJA 160 K/W

Electrical Characteristics

Reference point Ground GND, Tamb = 25C, VBatt = 13.5 V , unless otherwise specified (see figures 11 and 12) Parameters Test Conditions / Pin Symbol Min Typ Max Unit Voltage supply Pin 7 Supply voltage V Batt 6.0 16.0 V Supply current IS 0.5 2.0 3.0 mA Undervoltage threshold (POR) V S 3.0 5.1 V Internal Z-diode V Z 13.5 14.0 16.2 V Internal capacitor C S 15 pF Series resistance RV 510 Filter capacitor C V 47 F Oscillator input OSC Pin 8 Internal discharge resistor R DIS 1.3 2.0 3.2 k Lower switching-point voltage V OSC 0.16V S 0.20V S 0.24V S V Upper switching-point voltage V OSC 0.55V S 0.60V S 0.65V S V Input current V OSC = 0 V –IOSC 2 A Oscillator frequency fOSC 1 200 50 k Hz Note: All internally generated time sequences are derived from the oscillator frquency. The tolerances refer to a frequency adjusted to fOSC = 200 Hz.

Rev. A4, 03-Apr-01 5 (10) Electrical Characteristics (continued) Reference point Ground GND, Tamb = 25C, VBatt = 13.5 V , unless otherwise specified (see figures 11 and 12) Parameters Test Conditions / Pin Symbol Min Typ Max Unit Input limit switch LS Pin 3 Internal protection-diode voltage ILS = 10 mA V LS 19.5 21.0 25.5 V Internal capacitor C LS 25 pF Switching threshold voltage V LS 0.375V S 0.5V S 0.675V S V Input current V LS = VS ILS 1 A Internal pull-up resistor R LS 13 20 27 k External protection resistor R S 10 k Inputs INT, WIW A and PP Pins 1, 2 and 4 Internal protection-diode voltage IE = 10 mA V E 19.5 21.0 25.5 V Internal capacitor C E 25 pF Switching threshold voltage V E 0.375V S 0.5V S 0.675V S V Input current V E = 0 V –IE 1 A Internal pull-down resistor R E 13 20 27 k External protection resistor R S 10 k Relay output Pin 6 Saturation voltage I = 100 mA V REL 1.1 V Saturation voltage I = 200 mA V REL 1.5 V Z-diode clamp voltage I = 10 mA V REL 19.5 21.0 25.5 V Leakage current V = 14 V IREL 12 A Relay coil resistance R REL 60 Load-dump protection threshold V Batt 28 33 42 V Internal pulse times Debouncing period inputsINT/WIWA 12 - 16 clocks tD 60 70 80 ms Debouncing period inputsLS 3 – 4 clockstDL 15 17.5 20 ms Relay activation time 96 clockstON 480 ms Intermittent pause tINT 5.92 s After wiping period 1024 68 clocks tWIW A 4.78 5.46 s Pre-wash delay, reaction time for switch-on delay = t DEL + tD 88 – 96 clockstDEL 440 480 ms Note: All internally generated time sequences are derived from the oscillator frquency. The tolerances refer to a frequency adjusted to fOSC = 200 Hz.

Rev. A4, 03-Apr-01 9 (10)

Package Information

9.8 9.5 Dimensions in mm 1.64 1.44 4.8 max 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 max 9.8 8.2 7.77 7.47 technical drawings according to DIN specifications 13034 technical drawings according to DIN specifications Dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2

Rev. A4, 03-Apr-0110 (10) 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. V arious 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