MOTOROLA Freescale Semiconductor, Inc. Order Number: MC33187/D Rev. 4, 06/2001 Semiconductor Technical Data MC33187 Advance Information Long Duration Automotive Timer LONG DURATION AUTOMOTIVE TIMER This circuit is a Long Duration Automotive Timer primarily designed SEMICONDUCTOR TECHNICAL DATA as a deffoger timer, but as it is realised using a digital divider techniques and it is suitable for a variety of long duration timing functions. The circuit is available in an 8 pin surface plastic package. Freescale Semiconductor, Inc... • Operating Ambient Temperature from -40°C to 85°C D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8) • Operating Voltage Range from 5V to 18V • 400mA Output Current Capability • Integrated Input Debounce Circuitry PIN CONNECTIONS • Few External Components • Toggle Input for Timing Start and Stop RC 1 8 TS Gnd 2 7 N/C Relay 3 6 N/C Toggle 4 5 Vcc3 ORDERING INFORMATION Device Operating Temperature Range Package MC33187D -40°C to +85°C SO8 Block Diagram and Typical Application Vbat C Q C Q Q R C 12 R-C C Q 1 Q 1 6.8 Hz S Q Q C S Q C Vbat S Q Q S1 Q 14 Dz Relay 3 J D Q R Q C S 13 R Debounce Timer Timing In This document contains information on a new product. Specifications and information herein are subject to change without notice. © Motorola, Inc., 2001. All rights reserved. 8 TS R - I Out 2 Q 5 + + VCC 5 4 Toggle 2.3V For More Information On This Product, Go to: www.freescale.com TM MC33187 Freescale Semiconductor, Inc. MAXIMUM RATINGS Ratings Symbol Value Unit Pin 5 voltage Vpin5 18 V Pin 3 Voltage Vpin3 18 V Pin 3 Current Ipin3 400 mA Tstg -55 to +175 °C Tj -40 to +150 °C ELECTRICAL RATINGS THERMAL RATINGS Storage Temperature Operating Junction Temperature ELECTRICAL CHARACTERISTICS. Tamb from - 40°C to + 85°C, Vcc = 14V through 1KΩ, unless otherwise noted. Typical values reflect approximate Freescale Semiconductor, Inc... mean at 25°C, nominal VCC, at time of device characterization. Parameters Symbol Min fo 300 Typ Max Unit 400 Hz RC PIN 1 Oscillator Frequency Vbat = 14V trough 1KΩ Internal Counter Divider step VR1 4096 RELAY PIN 3 Output Leakage current @ Vpin3 = 28V / Vbat =14V IO1 100 uA Output Leakage current @ Vpin3 = 22V / Vbat = 0V IO2 100 uA Output Saturation Voltage @ 250mA / Vbat = 14V VO1 1.35 V Output Saturation Voltage @ 400mA VO2 2.60 V TOGGLE PIN 4 Toggle Input Clamp @ Vbat = 14V / Vpin8 = 14V through 9.1KΩ TCLP 6.0 9.0 V Toggle Threshold VTG-T 1.0 4.0 V Supply Current @ Vcc = 5V ICC 0.5 3.5 mA VCC Zener Regulation @ Vbat = 14V through 1K VCC 6.0 8.0 V ITS 25 200 uA VCC3 PIN 5 TS PIN 8 Time Select Current @ TS = 5V MC33187 MOTOROLA For More Information On This Product, Go to: www.freescale.com 2 MC33187 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... DEVICE DESCRIPTION Pin 1 : RC Pin 4 : TOGGLE Oscillator frequency control. Rt and Ct control the On/Off Control. A positive going voltage transition on this frequency of the clock oscillator. The period of oscillation is input toggles the timer between the On and Off state. If the nominally given by t = RtCt with the overall time period given timer is On and timing, it may be turned off by a positive going by T = 4096 RtCt. However, the following formula is believed signal on the toggle pin before the time delay has elapsed. to give a more accurate forecast of the overall time interval provided by the circuit for values of Rt between 200K and 2M Pin 5 : VCC and values of Ct between 1nF and 1uF. Positive supply terminal. The timer requires a supply Formula : T = 4.1 10e-3 (RT * (RT/150)*2.7) *CT. voltage of 5 to 18V applied to Vcc through Rs. An internal 7V zener limits the Vcc terminal voltage. Cs is included to provide Pin 2 : GND supply rail decoupling. Ground : Most negative supply terminal. Recommended values of Rs and Cs on a standard 12V vehicle system are Rs = 1KOhm and Cs = 100nF. Pin 3 : RELAY Relay output driver. Open collector drive from a Darlington transistor rated. Icmax = 400mA and Vmax = 18V. The relay driver output is on (low) during the time period. APPLICATION This is the standard operation of this circuit requiring the minimum of extra components. The ON/OFF switch is a non-latching push button (or similar), illuminated by a lamp in parallel with the rear window defogger. Rin protects the toggle input from supply line transients with a nominal of Rin = 10KΩ. The relay is intended to be a standard automotive relay (Rnom = 60Ω) with contacts rated appropriately for the defogger controlled. Dz with a nominal value of 16V +-5% is included to provide protection of the relay drive output transistor against relay turn-off and supply lines transients. The type of zener used is dependent of the level of protection required. An MZD16 will provide adequate protection for all relay turn-off and low energy supply transients, while a P6KE16A will provide full protection against all known transients. If the relay output is to be connected in any other way or to a non-standard relay, the maximum ratings quoted under the General Description above should be noted. Figure 1. .Defogger Timer Operation Ct Cs Rt RC TS Batt Rear Defogger Resistor GND N/C Relay N/C Batt Rs Dz Toggle Vcc Rin S1 MC33187 Batt MOTOROLA For More Information On This Product, Go to: www.freescale.com 3 MC33187 Freescale Semiconductor, Inc. The circuit shown demonstrates the use of the timer to provide a delay in turning the courtesy light off after the vehicle doors are closed. The components are the same as the defogger timer and Rt, Ct, Rs and Cs are as described in the general description above, while Dz and Rin are described in the description of the defogger timer. S1 to Sn represent the doors switches which can be basically the same as for a conventional system, except that only the relay coil current and not the full lamp current passes through them. The operation of the circuit is as follows : While one of the door switches is closed, the courtesy light is on with the relay current flowing through the switch. As soon as the last switch is opened, the energy stored in the relay coil causes the common connection of the switches to rise to the voltage permitted by the clamp consisting of Dz (approximately 16V). This provides a toggle input via Rin, causing the relay output of the integrated circuit to go low, thus keeping the relay energised for the period preset, with the direct connection to Rin ensuring that any switch bounce or noise during this period cannot cause toggle input to be detected. Retriggering at the end of the timing period is prevented by the built in the debounce timer. Figure 2. Courtesy Light Timer Operation Freescale Semiconductor, Inc... Ct Cs Rt RC Batt TS GND N/C Relay N/C Rin S1 Batt Rs Toggle Sn Vcc Dz MC33187 For More Information On This Product, MOTOROLA Go to: www.freescale.com 4 MC33187 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... This circuit is designed to just use the toggle and relay drive feature of the long duration timer. The functions of components Rs, Cs, Rt, Ct, Rin and Dz are as previously described. Although the circuit is not intended to be allowed to time out, Rt and Ct need to be included as it is necessary for the timer to run for the internal debounce timer to be reset. The control switch S1 needs to be a normally closed momentary type. While it is closed, D1 ensures that the oscillator does not run, while R1 ensures that D1 is reverse biassed when the switch is operated (open). C1 is included to provide a time constant RinC1 to delay the detection of a toggle input. Thus the operation of the circuit is as follows : When S1 is operated, the oscillator is allowed to start ; the toggle input is then recognised and the relay output changes state assuming that the switch has been released, the oscillator is stopped and the sequence above can be repeated. If the switch is held operated for 9 seconds, with the values recommended below, after it has been used to switch the relay on the circuit will time out and the relay switch off. No further action takes place until the circuit is reset by releasing the button. If the switch is held operated after it has been used to switch the relay off, nothing happens until the circuit is reset by releasing the button. Recommended values : Rs = 1KΩ Cs = 100nF Rt = 220KΩ Ct = 10nF Rin = 100KΩ R1 = 1KΩ C1 = 220nF Dz = MZD16 D1 = 1N4148 Note that the time constant RtCt and RinC1 are related (start up time and basic frequency of oscillator/switch to toggle delay time) and need to stay in the ratio (1:10). Figure 3. Relay Drive and Latch (No Timeout Ct Cs Rt D1 RC TS Batt Dz GND N/C Relay N/C C1 Batt Rs Toggle Vcc Rin S1 MC33187 R1 For More Information On This Product, MOTOROLA Go to: www.freescale.com 5 Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. MC33187 For More Information On This Product, MOTOROLA Go to: www.freescale.com 6 Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. Motorola reserves the right to make changes without further notice to any products herein. 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