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| (R) L9947 QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER LOW CONSUMPTION IN STANDBY MODE (<100A AT ROM TEMP; < 150A AT 130C) TWO HALF BRIDGES FOR 3A LOAD (RDSON = 0.25 TYP; Tj = 25C) TWO HALF BRIDGES FOR 0.5A LOAD (RDSON = 2.5 TYP; Tj = 25C) HIGH SIDE DRIVER FOR 2.5A LOAD (RDSON = 0.45 TYP; Tj = 25C) DIRECT CONTROLLED BY C (MULTIPLEX SYSTEM) OUTPUT HIGH/LOW LEVEL DIAGNOSTIC OVERCURRENT SWITCH OFF AND DIAGNOSTIC OVERTEMPERATURE DIAGNOSTIC BEFORE SWITCH OFF OPEN LOAD DIAGNOSTIC DESCRIPTION The L9947 is a bus controlled power interface inBLOCK DIAGRAM Multiwatt 15 ORDERING NUMBER: L9947S tended for automotive applications realized in multipower BCD60II technology. Up to three DC motors and one grounded resistive load can be driven with its four half-bridge and one high-side driver power outputs. The microcomputer compatible bidirectional parallel bus allows several interfaces connected on the same bus (multiplex system). The full diagnostic information is available on the bus. April 1999 1/13 L9947 ABSOLUTE MAXIMUM RATINGS Symbol VS IS VCC VCSN, VR/WN VMODE VD0 -D3 IOUT1 - OUT5 Tj Tj - SD Tj - HYS DC Supply Voltage Single Pulse tmax < 400ms Negative Supply Current Stabilized Supply Voltage Digital Input Voltage Digital Input/ Output Voltage Output Current Power Operating Junction Temperature Thermal Shutdown Junction Temperature Thermal Junction Temperature Hysteresis Parameter Value 26 40 -9 -0.3 to 6V -0.3 to VCC+0.3 -0.3 to VCC+0.3 internal limited -40 to 150 min 150 20 C C K Unit V V A V V V PIN CONNECTION THERMAL DATA Symbol Rth j-amb Zth j-amb Parameter Thermal Resistance Junction Ambient Ptot = 25W; free air; DC Thermal Resistance Junction Ambient still air; single pulse tp=20s Value 38 10 Unit C/W C/W 2/13 L9947 ELECTRICAL CHARACTERISTICS (VS = 8 to 16V; V CC = 4.5 to 5.5V; Tj = -40 to 150C;unless otherwise specified; the voltage are refered to GND and currents are assumed positive, when the current flows into the pin.) SUPPLY: Symbol ICC IS ICC + IS Parameter DC Supply Current DC Supply Current Sum Supply Current Test Condition VS = 16V; VCC = 5.5V; (status 8) VS = 16V; VCC = 5.5V; (status 8) IOUT1 = IOUT2 = IOUT3 = IOUT4 = IOUT5 = 0; Standby (status 2)VS = 14V; VCC = 5.5V; Tj = -40 to 25C IOUT1 = IOUT2 = IOUT3 = IOUT4 = IOUT5 = 0; Standby (status 2)VS = 14V; VCC = 5.5V; Tj > 25C VS < 14V; VCC = 5.5V; IOUT = 0; (status 17); VSOVT Overvoltage Shutdown Threshold 17 Min. Typ. 5 10 100 Max. Unit mA mA A 150 A 3 25 mA V CONTROL INPUTS: CNS, R/WN, MODE Symbol VINL VINH VINHyst IINL IINH RCSN Parameter Input Low Level Input High Level Input Hysteresis Input Current Low Input Current High (with exception of CSN Input) Input Resistance to GND (pull down at CSN pin) Test Condition VCC = 5V VCC = 5V VCC = 5V; VCC = 5V; V IN = 0 VCC = 5V; V IN = 5V 3.5 0.5 -10 -10 20 10 10 Min. Typ. Max. 1.5 Unit V V V A A K DATA INPUT: D0 - D3 Symbol VDINL VDINH VDINHyst IDINL IDINH Parameter Input Low Level Input High Level Input Hysteresis Input Current Low Input Current High Test Condition VCC = 5V; MODE = 0 VCC = 5V; MODE = 0 VCC = 5V; MODE = 0 VCC = 5V; V IN = 0 VCC = 5V; V IN = 5V 3.5 0.5 -10 -10 10 10 Min. Typ. Max. 1.5 Unit V V V A A DATA OUTPUT: D0 - D3 Symbol VDOL VDINH Parameter Output Low Level Input High Level Test Condition VCC = 5V; ID = 0.5mA; MODE =1 VCC = 5V; ID = 0.5mA; MODE =1 4 Min. Typ. Max. 0.6 Unit V V 3/13 L9947 ELECTRICAL CHARACTERISTICS (continued) OUTPUTS: Symbol RON OUT1 Parameter On Resistance to Supply or GND Test Condition VS = 8V; Tj = 125C; IOUT = 0.5A VS >10V; Tj = 125C; IOUT = 0.5A RON OUT2 On Resistance to Supply or GND VS = 8V; Tj = 125C; IOUT = 0.5A VS > 10V; Tj = 125C; IOUT = 0.5A RON OUT3 On Resistance to Supply or GND VS = 8V; Tj = 125C; IOUT = 2.5A VS > 10V; Tj = 125C; IOUT = 2.5A RON OUT4 On Resistance to Supply or GND VS = 8V; Tj = 125C; IOUT = 2.5A VS > 10V; Tj = 125C; IOUT = 2.5A RON OUT5 On Resistance to Supply VS = 8V; Tj = 125C; IOUT = -2A VS > 10V; Tj = 125C; IOUT = -2A |IOUT1 | |IOUT2 | |IOUT3 | |IOUT4 | |IOUT5 | IOUT1 IOUtT2 IOUT3 IOUT4 IOUT5 VOUT1-5 Output Current Limitation to Supply or GND Output Current Limitation to Supply or GND Output Current Limitation to Supply or GND Output Current Limitation to Supply or GND Output Current Limitation to GND Output Current Output Current Output Current Output Current Output Current Output Voltage Detection Thresholds VOUT1 =2.5V; (status 18) VOUT2 =2.5V; (status 18) VOUT3 =2.5V; (status 18) VOUT4 =2.5V; (status 17) VOUT4 =VS -2.5V; (status 16 or 18) VOUT5 =VS -2.5V; (status 18) VS =13V; (status 11) LOW HIGH HYSTERESIS status 12 - 15 steady state t >20ms 125 50 250 For the function of the short circuit current limitation see the functional description (pag....) 0.67 0.67 4 4 2.5 5 5 5 80 -80 -5 4.9 7.5 0.4 VS 0.6 VS 0.2 VS 130 Overtemperature Detection Thresholds Overcurrent Switch off Time Internal Oscillator Frequency 4/13 L9947 APPLICATION CIRCUIT DIAGRAM Fogure 1: Recommended Application Circuit. FUNCTIONAL DESCRIPTION The L9947 is a power interface circuit designed for a multiplex system controlled by a parallel C bus. The bus consists of four bidirectional data wires D0 - D3 and three control wires read/write (R/WN), mode (MODE) and chip select (CSN). The device needs two supply voltages. The first voltage supplies the half bridges, high side driver and its driving part. The second one is a 5V stabilized supply. The function of the device in the typical operating modes is described in the following tables. 5/13 L9947 Output Activating/write Table 1 Status 1 2 3 4 5 6 7 8 9 10 CSN R/WN MODE D0 1 _ _ _ _ _ _ _ _ _ X 0 0 0 0 0 0 0 0 0 X 0 0 0 0 0 0 0 0 0 X 0 0 1 1 0 0 1 1 0 D1 X 0 0 1 0 1 1 0 1 0 D2 X 0 1 0 1 0 1 0 1 0 D3 OUT1 OUT2 OUT3 OUT4 OUT5 X 0 0 0 0 0 0 0 0 1 AB T SRC SNK T T T T SNK T AB T T T SRC SNK T T SNK T AB T T T T T SRC SNK SNK T AB T SNK SRC SNK SRC SNK SRC SNK T AB T T T T T T T T SRC FUNCTION Hold output behavious as programmed before All Outputs, Standby mode M1, right M1, left M2, right M2, left M3, right M3, left Braking High side driver Notes: Where CSN = 0 the device is (for t 100s) transparent, in this condition any change of Data D0 .... D3 will lead to the apprpriate output response. Deselecting the circuit (CSN ) the last programmed status will be stored. Diagnostic / read. Table 2: In readout modes the port D0 .... D3 is acting as an output showing the conditions detected before. Status 11 12 13 14 15 CSN _ _ _ _ _ R/WN 1 1 1 1 1 MODE 0 1 1 1 1 D0 OUT1 0 1 0 1 D1 OUT2 0 0 1 1 D2 OUT3 OT OT OT OT D3 OUT4 OUT5 OUT5 OUT5 OUT5 * * * OUT1, Function OUT2, OUT3, OT, OT, OT, OT, OUT4; OUT5; OUT5; OUT5; OUT5; No failure, OVC1, OVC2, OVV or OVV + OVC1 or OVV + OVC2 Diagnostic / write. Table 3: Diagnostic modes are used to check the load status for broken or shorted wires. Status CSN R/WN MODE D0 D1 D2 D3 OUT1 16 17 18 _ _ _ 0 0 0 1 1 1 0 1 0 1 0 1 0 0 1 X X X T T 10mA SNK OUT2 T T 10mA SNK OUT3 T T OUT4 140mA SRC 140mA SNK OUT5 T T 10mA SRC Is+Icc 1mA for IOUT4 = 0 Function 10mA 140mA SNK SRC Standby and clear / write. Table 4: Status CSN R/WN MODE D0 D1 D2 D3 OUT1 19 20 _ 0 0 X 0 X 1 X 1 X 1 X 1 X T T OUT2 T T OUT3 T T OUT4 T T OUT5 T T Function Clear Clear, Static CSN = 0 will force clear status and standby after 100s without respect of data inputs was >0.6Vs during test - Low if output voltage was < 0.4Vs during test Symbols: 1: Logic High 0: Logic Low T: Tristate X: Don't care 6/13 AB: As before _ Low pulse t < 100s SRC: Source SNK: Sink OT: Overtemperature OVC1: Overcurrent 1 OVC2: Overcurrent 2 OVV: Overvoltage OUTX: - High if output voltage L9947 Figure 2: System Startup Sequence SYSTEM STARTUP (figure 2) It is not mandatory that VS is present before VCC. With the presence of the VCC the internal logic would be reseted and the system restarts under control of the inputs. If CSN = 0 for more than 100s after the presence of VCC the standby mode is activated. Standby is also activated when the CSN and VCC would be high at the same time. When CSN = 0 and VCC goes up, the device is not controlled by the bus. The outputs remain in tristate but the current consumption is larger than 100A. A high - low - signal at the CSN - wire is mandatory to control the outputs. There is no undervoltage detection level for the supply voltage VS implemented. The VCC should be supplied from the same voltage supply as the driver of the D0 -D3 pins (eg. C). 7/13 L9947 DATA TRANSFER AND OUTPUTS ACTIVATING (Figure 3) The half bridges of OUT1, OUT2 and OUT3 can be used with OUT4 to drive three bidirectional motors in full bridge configuration as shown in fig.1 Only one motor can be driven in the same time. The C writes the corresponding word status 1 till 10 at the bus and latch it with a low pulse in the L9947. So the motor is activated. To stop the motor it is useful to insert a braking phase (status 9). In the braking condition there are all low side DMOS of the half bridges switched-on in this case the flyback currents flows through the low side switches instead of the intrinsic diodes of the half bridges. After that, the half bridges could be switched in tristate (T). The high side driver, OUT5 can be switched only when all the half bridges are in tristate status 10. The C works always as master and the L9947 Power Interface as slave. That means: the C starts the communication between the Power Interface and itself with low transition at the CSN line. CSN = 0, R/WN= 0 the L9947 reads the data at the bus and execute the command as shown in tables 1,3,4 (write mode). The high slope of the CSN stores the last command and execute it further. All inputs are disabled if CSN= 1. So the bus can be used for another device. With CSN = 0 and R/WN = 1 the L9947 writes the status of the diagnostic at the parallel bus until CSN becomes high (table 2; status + 15) (read mode). The power outputs maintain the same status as before. Figure 3: Signal sequence for data transfer to switch M1 right, read the output status, brake the motor and activate the standby mode. 8/13 L9947 Bus Timing (figure 4) The bus signal must be defined t3 = 1s before CSN goes low. It is allowed to change the level of R/WN during CSN = 0. The other signals could be changed. To store a command it is mandatory to fix the D0 - D3 and MODE signals t9 = 1s before the positive edge of CSN. OVERCURRENT AT OUT1 - OUT5: The output currents of OUT1 - OUT5 are internally limited. This is realized in the following way: Figure 4: Bus and Outputs Timing Diagram When the output current reaches a certain level (see pag...) the Gate - Source voltage will be clamped to a lower level. The output current is now limited and follows the output ID, UDS characteristic for this Gate - Source voltage. An internal timer starts when the output voltage drop (Drain - Source) increases above 0.4VS. After 100s typ. the output is switched OFF and the corresponding overcurrent bit (OVC1 or OVC2) will be set. The outputs can be activated again with the next input data word. TIMING CHARACTERISTICS Symbol t1 t2 t3 t4 t5 t6 t7 t8 t9 Width of CSN Low Width of CSN High Input Signals Before Negative Cdge of CSN Input Signals After Positive Edge of CSN Valid Diagnostic Data Valid Diagnostic Data Delay Time from Input to Power Output, VS = 13V CSN = Low Duration (Pulse Length) for CLEAR of latched Data Input Data Before Positive Edge of CSN Which Should be Latched 100 1 Parameter Min. 20 10 1 1 10 10 300 Typ. Max. 90* Unit s s s s s s s s s t1 and t5 are derived from the internal oscillator frequency t7 varies with the supply voltage VS, relating to the output voltage slope limitation (*) for t1 > 100s the latched data will be reseted due to CLEAR (status 20) 9/13 L9947 Diagnostic (TABLE 2; STATUS 11 - 15): The diagnostic delivers the information of the output voltage status (high or low) at the outputs OUT1 - OUT5, overcurrent, overvoltage shutdown and over temperature. The output voltage detection is done by hysteresis comparators with thresholds at 0.4VS and 0.6 VS. The overcurrent (OVC) information is latched till a new or repeated write command was received. The OVC1 is set to high with the overcurrent condition at any of the half-bridge outputs. OVC2 error bit will be set with the overcurrent condition at OUT5. The overvoltage (OVV) is high till the supply voltage VS exceeds the overvoltage threshold of 20V typ. The overtemperature (OT) is high if the junction temperature is less than typ. 30 Kevin below the thermal shutdown junction temperature (TJSD). Detection of Load Interruption (TABLE 3): The outputs OUT1 - OUT4 are connected by the motors in the application. The output OUT4 can be switched as current source or sink with typ. 140mA current capability (status 16 + 17). The sum of current consumption is <1mA if the output current IOUT4 = 0 (status 17). The diagnostic of the output voltage delivers the information if one or more of the half bridges is shorted to VS or GND or the motor connections are interrupted. In status 18 the outputs OUT1 - OUT3 are switched as current sinks (typ. 10mA), OUt4 and OUt5 as current sources (OUT4 140mA, OUT5 10mA). With this current the influence of leakage currents and oxidized contacts is eliminated. Standby (TABLE!; STATUS 2): The L9947 is set in standby mode with the positive edge of CSN when all other inputs are low. All latched data will be cleared and the inputs and outputs are in tristate. The total current consumption is less than 100A. CSN=0 quits the standby. All latched data are cleared. Clear (TABLE 4: STATUS 20): If the chip select is low for ore than TCLR = 100s, the internal latched data will be cleared and the outputs become tristate. Repetitive high low edges activate the inputs again. Also a broken CSN-wire activates this clear function due to the internal pull down resistor at CSN input. After a clear, the L9947 goes in standby and can be wake up with a negative edge of CSN. Thermal Shutdown: When the junction temperature increases above TJSD the power DMOS transistors are switched off until the junction temperature drops below the value TJSD - TJHYST. Clamp Current of The Power Outputs: For output voltages 10V and larger a clamp current of appr. 50A will flow in the power outputs due to the internal gate-source voltage limitation, when the device is not in standby. Overvoltage Shutdown: When the supply voltage VS exceeds the overvoltage threshold VSQVT, typ. 20V,the outputs OUT1 - OUT5 go in tristate condition. If the supply voltage goes under the overvoltage shutdown treshold, the status is the same as before the overvoltage condition occurred. Undervoltage: In the voltage range 2V 10/13 L9947 Figure 5: Supply Current Path at VCC Interruption 11/13 L9947 DIM. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 1 0.49 0.66 1.02 17.53 19.6 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 1.27 17.78 0.55 0.75 1.52 18.03 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.019 0.026 0.040 0.690 0.772 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.050 0.700 mm TYP. inch TYP. MIN. MAX. 5 2.65 1.6 MIN. MAX. 0.197 0.104 0.063 OUTLINE AND MECHANICAL DATA 0.039 0.022 0.030 0.060 0.710 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 22.2 22.1 17.5 10.7 4.55 5.08 0.874 0.870 0.689 0.421 0.179 0.200 Multiwatt15 V 12/13 L9947 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1999 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 13/13 |
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