motorola,inc 1999 rev 5.1 MC33385 automotive quad low side driver motorola semiconductor quad low side driver simplified block diagram on1 v ref i-scb filter t-iscb on1 i-ol filter t-iol non1 vcc vcc vcc ires failure register (fr) fr reset res ures register shift ires trigger res ures driver charge pump dv/dt control res reset ures under voltage osc oscillator non1 non2 non3 non4 clk sdi ncs sdo gnd nres out1 out2 out3 out4 vcc scg filter t-scg reset s r pin assignment gnd2 out2 n.c non2 sdi clk ncs non4 out4 gnd4 gnd1 out1 n.c non1 sdo nres vcc non3 out3 gnd3 over-temp. detection 1 2 3 5 4 6 7 8 9 10 1 2 3 5 4 6 7 8 9 20 1 1 1 1 1 1 1 1 1 21 21 heat sink ordering information device temperature range package hsop20 -40 c to +125 c MC33385dh semiconductor technical data dh suffix hsop20 package the MC33385 is a quad low side driver fully protected switch. this device is a general purpose low side driver but has been especially designed to operate in engine management application as injector driver or automotive gear box. it is interfaced directly with a microcontroller for parallel control of the load and the individual output diagnostic is done through a spi. the diagnostic logic recognizes 4 failure types at each output stage the overcurrent, the short to gnd, the openload and the over-temperature. ? rdson of 250m w per output at 25 c ? supplied from the main 5v vcc ? input cmos compatible ? diagnostic through spi ? nominal current of 2a per output ? current limitation at 3a with automatic turn off ? output internally clamped at 50v typ for inductive load drive ? junction to case thermal resistance of 4.4 c/w ? individual output over temperature shutdown
MC33385 motorola 2 MC33385 maximum ratings t j = - 40 c up to 150 c ratings symbols min max unit supply voltage voltage range vcc - 0.3 7 v outputs : 1...4 continuous output voltage (with no reverse current) v out - 0.3 45 v continuous current i outc 2.5 a peak output current i outp - 10 i scbmax a clamped energy at the switching off (see figure 6) w off 70 mj for 1ms inputs input voltage (inputs) v in - 0.3 vcc + 0.3 v input protection diode current i in - 20 1 ma outputs : sdo input voltage (outputs) v o - 0.3 vcc + 0.3 v input protection diode current i o - 20 1 ma thermal ratings operating junction temperature t j - 40 150 c thermal resistance : junction-case (one powerstage in use) r thjc 4.5 k/w thermal resistance : junction-ambient (device soldered on printed circuit board) r thja 50 k/w range of functionality t case = - 40 c up to 125 c ratings symbols min max unit supply voltage supply voltage range v cc 4.5 5.5 v junction temperature junction temperature continuous (continuous) t j1 - 40 150 c junction temperature dynamical (time limited) t j2 185 c output current output current range i out i scbmax reset behaviour reset changeable (at nres-pin) v cc v ccres 5.5 v undervoltage reset (independent of nres) active for vcc = 0v to vccpro v ccres 3.35 3.95 v undervoltage protection protection active for vcc=0v to vccpro v ccpro 1.5 4.0 v over temperature temperature detection threshold t off 155 185 c
MC33385 motorola 3 MC33385 electrical characteristics t case = - 40 up to + 125 c and v cc = 4.5v up to 5.5v parameters symbol min typ max unit supply current standby current (without load) (non1...non4 = high level) 5.15v 3 v cc 5.5v 3 v cc i ccstb1 i ccstb2 6 7 ma ma operating mode (for 5.15v 3 v cc ) (iout 1...4) = 2a i ccopm 17 ma d i cc during reverse output current (iout = - 5a on one output) d i cc 100 50 ma ma inputs nonx, ncs, clk, nres, sdi low threshold vinl -0.3 0.2*v cc v high threshold vinh 0.7*vcc v cc + 0.3 v hysteresis v hyst 0.85 v input current (vin = vcc) iin 10 m a input current (vcc >vres & 0v MC33385 motorola 4 MC33385 turn off delay (non = 50%, vout = 0.1 * vbat) (non = 50%, vout = 4v) t doffa t doffb 1 4.7 3 7.5 m s m s undervoltage protection max on time after a output voltage ramp from 0v to 25v at v cc = 0v...vccpro t rpon 100 m s matching turn on delay (non = 50%, vout = 0.9 * vbat) t mon - 3 3 m s rise time turn off (10% - 90% of v clp ) t roff 8.5 12 outputs reverse diode reverse output current i rd 2,5 a reverse peakcurrent (note 1 and 2) i rdp 5 a reverse voltage drop - i out = - 5a - i out = - 2,5a v rd1 v rd2 1.0 0.85 1.7 1.7 v v powerstage protection short current limit i scb 3.0 5 a short circuit delay time t scb 0.2 2 m s v cc undervoltage v ccmin 3.35 3.95 v diagnostic short to gnd threshold voltage for i out 2a v ref 0.390xvcc 0.435xvcc v short to gnd filter time t scg 140 250 m s open load threshold current i ol 10 50 ma open load filter time t ol 140 250 m s pull-up resistor r ol 2.0 8.0 k w temperature detection threshold t off 155 185 c notes 1&2: for t 2ms. max. reverse current is limited to - 10a (for all outputs together) serial diagnostic link : load capacitor at sdi and sdo = 100pf clock frequency (50% duty cycle) fclk 3 mhz minimum time clk = high tclh 100 ns minimum time clk = low tcll 100 ns propagation delay (clf data at sdo valid) tpcld 100 ns ncs = low to data at sdo valid tpcld 100 ns clk low before ncs low (setup time clk to ncs change h/l) tsclch 100 ns clk change l/h after ncs = low thclcl 100 ns sdi input set up time (clk change h/lafter sdi data valid) tscld 20 ns sdi input hold time (sdi data hold after clk change h/l) thcld 20 ns clk low before ncs high tsclcl 150 ns clk high after ncs high thclch 150 ns electrical characteristics t case = - 40 up to + 125 c and v cc = 4.5v up to 5.5v parameters symbol min typ max unit
MC33385 motorola 5 MC33385 diagnostic register and spi timing figure1- timing diagram to read the diagnostic register note : fr -reset means reset failure storage (internal signal) figure2- diagnostic failure register structure figure3- serial interface timing ncsl/h ti output data flout tpchdz 100 ns capacitance at sdi, sdo, clk, cs tpcld 10 pf ncs filtertime (pulses t fncs will be ignored) t fncs 10 40 ns electrical characteristics t case = - 40 up to + 125 c and v cc = 4.5v up to 5.5v parameters symbol min typ max unit clk ncs sdo fsl lsb d1 d2 d3 d4 d5 d6 msb lsb d1 d2 d3 d4 d5 d6 msb sdi fr-reset fsl lsb d1 d2 d3 d4 d5 d6 msb d7 d0 failure indicator bit only valid during ncs = low to the first l to h clk change 1 : failure stored 0 : no failure status channel 4 11 : no failure 01 : open circuit 10: short to battery or overtemperature 00 : short to gnd status channel 2 status channel 3 status channel 1 clk ncs sdo sdi d0 d1 d7 d7 d0 fsl tcsdv tsclch tcsdv thclcl tclh tcll tsclcl thclch tpcld tpchdz thcld
MC33385 motorola 6 MC33385 figure4- diagram to short-circuit to gndfailure (scg-failure) detection figure5- diagram to open load failure (ol-failure) detection figure6- max clamp- energy specification off non on vdrain vdrain < vref at off-state t-scg (filter-time) failure detection failure store failure detection time for an scg failure scg-failure filter time off non on iload diagnostic active failure detection t-ol (filter-time) failure detection active for an sporatical ol-failure iload > i-ol failure store sporatical failure detection statical failure detection i-ol iload > iol for t > tol retrigger t filter tol retrigger filter sporatical failure-detection t < t-ol 0,5 0 4 3,5 3 2,5 2 1 300 250 200 150 100 50 0 350 e n e r g y ( m j ) pulse-duration (ms) 1,5 125 c 25 c - 40 c
MC33385 motorola 7 MC33385 device description introduction the device is a quad low side driver driven by four cmos input stages. each output power transistor is protected against short to v bat and by a zener clamp against overvoltage. a diagnostic logic recognizes four failure types at the output stage : overcurrent, short to gnd, open-load and overtemperature. the failures are individually stored in a byte which can be read out via a serial interface (spi). output stage control each of the four output stages is switched on and off by an individual control line (non-input). the logic level of the control line is cmos compatible. the output transistors are switched off when the inputs are not connected. power transistors each of the four output stages has its own zenerclamp. this causes a voltage limitation at the power transistors when inductive loads are switched off. drain voltage ramp occurring when output is switched on or off, is within defined limits. output transistors can be connected in parallel to increase current capability. in this case, the associated inputs should be connected together. short-circuit and overtemperature protection if the output current increases above the short current limit for a time longer than t scb or if the temperature increases above t off then the power transistor is immediately switched off. it remains switched off until the control signal on the non- input is switched off and on again. diagnostics following failures at the output stage are recognized : short -circuit to v bat or overtemp...... = scb (highest priority) short -circuit to gnd............................. = scg open load................................................. = ol (lowest priority) the scb failure is recognized by an overcurrent (current above the short current limit) or an overtemperature. if the current through the output stage is lower than the iol- reference, after a filter time an ol failure will be recognized. this measurement is active while the powerstage is switched on. the scg failure will recognize when the drain voltage is lower than the ol reference limit, while the output stage is switched off. all four outputs have an independent overtemperature detection and shutdown. all failures are stored in individual registers. they can be read by the microprocessor via the serial interface. there is no failure detected if the powerstage control time is shorter than the filter time. diagnostic interface the communication between the microprocessor and the failure register runs via the spi link. if there is a failure stored in the failure register, the first bit of the shift register is set to a high level. with the h/l change on the ncs pin the first bit of the diagnostic shift register will be transmitted to the sdo output. the sdo output is the serial output from the diagnostic shift register and it is tristated when the ncs pin is high. the clk pin clocks the diagnostic shift register. new sdo data will appear on every rising edge of this pin and new sdi data will be latched on every clk?s falling edge into the shift register. with the first positive pulse of the clk, the failure register will be cleared. there is no bus collision at a small spike at the ncs. the clk is always low while the ncs-signal is changing. reset there are two different reset functions realised : under voltage reset : as long as the v cc voltage is lower than v ccres , the powerstages are switched off and the failure- register are reseted. reset pin : as long as the nres-pin is low, following circuits are reseted : ? powerstages ? failure register undervoltage protection at low vcc voltage, the device remains switched off even if there is a voltage ramp at the out pin.
MC33385 motorola 8 MC33385 this device is dedicated to automotive applications such as engine managements systems, automatic gear box... it interfaces between the microcontroller and the actuors of the system. the loads can be only resistive or resistive and inductive such as injectors, egr valves...etc... following is an example of application schematic, see figure below. figure7- typical application pins function description pin no. function description 1 gnd2 ground 2 2 out2 output channel 2 3 nc 4 non2 input control signal for channel 2 5 sdi serial data input 6 clk clock line for serial interface 7 ncs chip select for serial interface 8 non4 input control signal for channel 4 9 out4 output channel 4 10 gnd4 ground 4 11 gnd3 ground 3 12 out3 output channel 3 13 non3 input control signal for channel 3 14 vcc 5v power supply 15 nres reset input 16 sdo data output of serial interface 17 non1 input control signal channel 1 18 nc 19 out1 output channel 1 20 gnd1 ground 1 case connected to the pcb ground for thermal purposes MC33385 loads ncs voltage clk sdi sdo nres non1 non2 non3 non4 mcu gnd1 gnd2 gnd3 gnd4 regulator vcc out1 out2 out3 out4 47nf..150nf vbat
MC33385 motorola 9 MC33385 figure8- standby current versus temperature figure9- operating mode current versus temperature figure10- low threshold input voltage versus temperature figure11- high threshold input voltage versus temperature figure12- output clamp voltage versus temperature figure13- rdson versus temperature 1,75 2 t, temperature ( c) i c c s t b ( m a ) -50 0 25 100 -25 50 75 125 2,25 2,50 2,75 3 1,50 1,25 1 vcc=5,5v vcc=5,15v 10,00 10,50 t, temperature ( c) i c c o p m ( m a ) -50 0 25 100 -25 50 75 125 11,00 11,50 12,00 12,50 9,50 9,00 8,50 all outputs=2a vcc=5,15v 355 360 t, temperature ( c) v i n l / v c c -50 0 25 100 -25 50 75 125 365 370 375 380 350 345 340 vcc=5,5v vcc=4,5v 619 620 t, temperature ( c) v i n h / v c c -50 0 25 100 -25 50 75 125 621 622 623 624 618 617 616 vcc=4,5v ou 5,5v 52,50 53,00 t, temperature ( c) v c l p ( v ) -50 0 25 100 -25 50 75 125 53,50 54,00 54,50 55,00 52,00 51,50 51,00 iout1=1a 275 300 t, temperature ( c) r d s o n ( m w ) -50 0 25 100 -25 50 75 125 325 350 375 400 250 225 200 iout1=3a vcc=4,5v
MC33385 motorola 10 MC33385 figure17- inductive switching figure14- open load versus temperature figure15- vcc undervoltage versus temperature figure16- short current limit versus temperature figure18- turn on delay figure19- turn off delay 22,75 23,00 t, temperature ( c) i o l ( m a ) -50 0 25 100 -25 50 75 125 23,25 23,50 23,75 24,25 22,50 3,73 3,74 t, temperature ( c) v c c m i n ( v ) -50 0 25 100 -25 50 75 125 3,75 3,76 3,77 3,78 3,72 3,71 3,70 24,50 24,00 4,10 4,20 t, temperature ( c) i s c b ( a ) -50 0 25 100 -25 50 75 125 4,30 4,40 4,50 4,00 4,60 3,90 3,80 vcc=4,5v vcc=5,5v in1 (1v/div) vout1(2v/div) tdon tdoffa tdoffb in1 (1v/div) vout1(2v/div) clamp voltage i (200ma/div) v (10v/div)
MC33385 motorola 11 MC33385 motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. motorola does not assume any liability arising out of the application or use of any product or circuit described herein ; neither does it convert any licence under its patent rights of others. motorola products are not authorized for use as components in life support devices or systems intended for surgical implant into the body or intended to support or sustain life. buyer agrees to notify motorola of any such intended end use whereupon motorola shall determine availability and suitability of its products for the use intended. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal employment opportunity/affirmative action employer. case outlines
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