TWR-LCD User`s Manual
Contents
1. 11 4 1 Power Supply Input Connector 1 ___ 11 4 2 External Brake Resistor Interface 4 ee eese eene tette tente trente 11 4 3 Motor Connect asana aaea oona 11 4 4 Encoder Hall effegulntentacell 99e te ttn tentent tenen 11 4 5 Elevator Connections 007 ___ 12 Configuration Settings _ 17 5 1 Zero Ohm EET eee Reese 17 5 2 Jumper Settings EOD eeu e 17 6 Mechanical Form Factor eere enne nno nno nnn nunt ina TEE E IEEE RE EE E oo ee ennt 19 TWR MC LV3PH User s Manual Page 2 of 19 727 freescale semiconductor 1 Overview The 3 phase Low Voltage Motor Control board TWR MC LV3PH is a peripheral Tower System Module with one of the available MCU tower module accommodating a selected microcontroller it provides a ready made software development platform for one third horsepower off line motors Feedback signals are provided that allow a variety of algorithms to control 3 phase PMSM and BLDC motors The TWR MC LV3PH module features e Power supply voltage input 122. semiconauctor TWR MC LV3PH User s Manual Rev 1 0 Freescale Semiconductor Inc Lo 2 freescale semiconductor Contents User cat dent 1 1 3 2 Reference 5 3 Hardware Features Gui nd aur or Y SUO aC E Gu a aco aou onc CR vx 5 Suo aun 6 3 2 Electrical Characteristics tci che 6 3 3 Three Phase Field Effect Transistor Pre driver 7 3 4 3 Phase Bridge M 8 3 5 Bus Voltage and Current Feedback eise 8 3 6 Safety FUNCHONS 22 crore oe AA 9 3 7 Back EMF SighalS 9 3 8 Phase Current Sensing eget ocn da a acp Dn 9 3 9 EEDIidicablOlis o oie tameii Anm n d e see 10 3 10 Encoder Hall Effect 10 10 4 Signal
3. 22 freescale semiconductor 5 Configuration Settings There are several jumpers provided for isolation configuration and feature selection Refer to the following table for details The default installed jumper settings are shown in bold 5 1 Zero Ohm Resistors Resistor Options Setting Description Placed Enables DCB_POS voltage to MC33937A Unplaced Disables DCB POS voltage to MC33937A Placed Enables SENSE DCB signal as output of U6B Unplaced Disables SENSE DCB signal as output of U6B Enables SENSE DCB signal as output of R88 MC33937A OUT Placed MC33937A nplaced Disables SENSE_DCB signal as output of d MC33937A Placed Enables DRV INT connection to elevator tipo Unplaced Disables DRV_INT connection to elevator Placed Enables DRV_OC connection to elevator iis MH NP Unplaced Disables DRV OC connection to elevator Placed Enables Chip Select 0 connection to elevator Unplaced Disables Chip Select 0 connection to elevator Placed Enables Chip Select 1 connection to elevator spices Unplaced Disables Chip Select 1 connection to elevator Table 5 TWR MC LV3PH Jumper Settings 5 2 Jumper Settings Jumper Options Setting eae Ba ge ania qp J12 AN2 Signal Select 13 pase purent 101 J13 A
4. 24VDC extended up to 50 see chapter 3 2 Electrical Characteristics for details e Output current up to 8 Amps e Power supply reverse polarity protection circuitry e 3 phase bridge inverter 6 MOSFET s 3 phase MOSFET gate driver with over current and under voltage protection e 3 phase and d c bus current sensing shunts e DC bus voltage sensing e 3 phase back EMF voltage sensing circuitry e Low voltage on board power supplies e Encoder Hall sensor sensing circuitry e Motor power and signal connectors e User LED power on LED 6 PWM LED diodes A block diagram for the TWR MC LV3PH is shown in the figure below TWR MC LV3PH User s Manual Page 3 of 19 5 freescale semiconductor PWM LEDs Motor User LED Connector PWM iud Motor Phases ENABLE Freescale 6x PWM 3 Phase MOSFET INT MC33937A H Bridge Oo SPI 9 Signal Conditioning L Signals O Power Supplies 5V 3 gt 5V 3 3V Analog Power Supply 3 3V A Brake Control Driver amp MOSFET TMR Input Filter Encoder Brake Power HS Input Resistor Input Figure 1 TWR MC LV3PH Block Diagram Secondary Elevator Connection TWR MC LV3PH User s Manual Page 4 of 19 77 freescale semiconductor MOSFET H Bridge M
5. C A60 TMR5 B61 DRV INT X A61 TMR4 B62 IRQ_A DRV_OC X A62 RSTIN_b B63 EBI_ALE EBI_CS1_b A63 RSTOUT_b RESET X B64 EBI_CSO_b A64 CLKOUTO B65 GND Ground X A65 GND Ground X B66 EBI_AD15 A66 EBI_AD14 B67 EBI_AD16 A67 EBI_AD13 B68 EBI_AD17 A68 EBI_AD12 B69 EBI_AD18 A69 EBI_AD11 TWR MC LV3PH User s Manual Page 13 of 19 freescale semiconductor TWR MC LV3PH Primary Connector Used Jmp Pin Used Jmp B70 EBI_AD19 A70 EBI_AD10 B71 EBI_R W_b A71 EBI_AD9 B72 EBI OE b A72 EBI_AD8 B73 EBI_D7 A73 EBI_AD7 B74 EBI_D6 74 EBI_AD6 B75 _05 75 EBI AD5 B76 04 A76 EBI_AD4 B77 EBI_D3 77 EBI_AD3 B78 EBI_D2 78 _ 2 79 EBI_D1 79 _ 1 880 EBI_DO A80 EBI_ADO B81 GND Ground X A81 GND Ground B82 3 3V 3 3V Power X A82 3 3V 3 3V Power TWR MC LV3PH User s Manual Page 14 of 19 21 freescale semiconductor Table 5 TWR MC LV3PH Secondary Elevator Connector Pinout TWR SER2 Secondary Connector Jmp Pin D1 5V 1 5 02 GND Ground X C2 GND Ground X D3 3 3V 3 3V D4 ELE_PS_SENSE 4 3 3V 05 GND Ground X C5 GND Ground D6 GND Ground X 6 GND Ground D7 SPI2_CLK C7 SCL2 D8 SPI2 CS1 b C8 SDA2 D9 SPI2 CSO b C9 GPIO25 D10 SPI2 MOSI C10 ULPI_STOP 011
6. CLKOUT1 A25 SSI_TXD B26 GND Ground X A26 GND Ground X TWR MC LV3PH User s Manual Page 12 of 19 27 freescale semiconductor TWR MC LV3PH Primary Connector Used Jmp Pin Used Jmp B27 AN7 A27 SENSE E AN6 SENCE C 1 SENSE DCB x x AN2 a X X B29 aoo TAE X x A29 AN SENSE B30 AN4 V_SENSE_DCB A30 ANO NON X X B31 GND Ground A31 GND Ground X B32 DAC1 A32 DACO B33 TMR3 33 TMR1 ENC_PHASE_B X B34 TMR2 ENC_INDEX X A34 TMRO ENC PHASE A X B35 GPIOA A35 GPIO6 B36 3 3V 3 3V Power X A36 3 3V 3 3V Power X B37 PWM7 A37 PWM3 PWM_BB X B38 PWM6 A38 PWM2 PWM BT X B39 PWM5 PWM_CB A39 PWM1 PWM_AB X B40 PWM4 PWM_CT 40 PWMO PWM_AT X B41 CANRXO 41 RXDO B42 CANTXO 42 TXDO B43 1WIRE A43 RXD1 B44 SPIO_MISO 101 MISO X A44 TXD1 B45 SPIO MOSI 100 MOSI X A45 55 B46 SPIO_CSO_b SS X A46 VDDA VDDA ELV 847 SPIO CS1 b 55 X 47 VREFA1 B48 SPIO_CLK SCLK X A48 VREFA2 B49 GND Ground X A49 GND Ground X B50 SCL1 A50 GPIO14 B51 SDA1 A51 GPIO15 B52 GPIOS SPIO_HOLD 103 DRV EN X A52 GPIO16 SPIO WP 102 B53 USBO DP PDOWN A53 GPIO17 54 USBO_DM_PDOWN 54 USBO_DM B55 IRQ_H A55 USBO_DP B56 IRQ_G 56 USBO_ID B57 IRQ_F AS7 USBO VBUS B58 E A58 TMR7 B59 D A59 TMR6 B60
7. SPI2_MISO C11 ULPI_CLK Sn ee Se 012 COL C12 GPIO26 D13 ETH RXER C13 ETH MDC 014 ETH_TXCLK C14 ETH MDIO D15 ETH TXEN C15 ETH RXCLK D16 GPIO18 C16 ETH RXDV 017 GPIO19 SDHC_D4 C17 GPIO27 SDHC_D6 018 GPIO20 SDHC 05 C18 GPIO28 SDHC_D7 019 ETH_TXD1 19 ETH_RXD1 020 ETH_TXDO C20 RXDO D21 ULPI NEXT USB1 DM C21 DATAO USB3 DM D22 ULPI DIR USB1 DP C22 ULPI_DATA1 0583 DP D23 UPLI DATAS USB2 DM C23 USB4 DM D24 ULPI DATA6 USB2 DP C24 ULPI_DATA3 USB4_DP D25 DATA7 25 ULPI_DATA4 D26 GND Ground X C26 GND Ground X D27 LCD_HSYNC LCD_P24 C27 AN11 D28 LCD_VSYNC LCD_P25 C28 AN10 029 AN13 C29 AN9 030 12 C30 AN8 amp D31 GND Ground X C31 GND Ground X 032 LCD_CLK LCD_P26 22 GPIO29 D33 TMR11 c33 TMR9 D34 TMR10 C34 TMR8 D35 GPIO21 C35 GPIO30 D36 3 3V C36 3 3V D37 PWM15 C37 PWM11 038 PWM14 C38 PWM10 039 PWM13 C39 PWM9 040 PWM12 C40 PWMS8 041 CANRX1 C41 RXD2 TSIO 042 1 42 TXD2 TSI1 TWR MC LV3PH User s Manual Page 15 of 19 o 27 freescale semiconductor TWR SER2 Secondary Connector Jmp Pin D43 GPIO22 C43 RTS2 TSI2 044 LCD_OE LCD_P27 44 CTS2 1513 045 LCD DO LCD PO C45 514 046 LCD D1 LCD P1 C46 TXD3
8. the controller input pins If an input voltage higher than 24V is applied the plugged TWR modules might be damaged TWR MC LV3PH User s Manual Page 6 of 19 2 freescale semiconductor Characteristic DC input voltage Quiescent Current Logic 1 Input Voltage Logic 0 Input Voltage Input Resistance Analogue Output Range Bus Current Sense Voltage Bus Current Sense Offset Bus Voltage Sense Voltage Bus Voltage Sense Offset Bus Continuous Output Current Total Power Dissipation per MOSFET Dead time set by SW MC33937 3 3 Three Phase Field Effect Transistor Pre driver Symbol Vout Isense lottset Vottset lc Pp lor Min 12 1 5 0 9 Table 1 Electrical Characteristics Typ TBD 10 412 1 65 91 Max 24 TBD 15 Units mA kQ mV A mV V us The TWR MC LV3PH module utilizes Freescale MC33937A Three Phase Field Effect Transistor Pre driver The 33937 is a Field Effect Transistor FET pre driver designed for three phase motor control and similar applications The integrated circuit IC uses SMARTMOS technology The IC contains three High Side FET pre drivers and three Low Side FET pre drivers Three external bootstrap capacitors provide gate charge to the High Side FETs The IC interfaces to a MCU via six direct input control signals an SPI port for device setup and asynchronous reset enable and interrupt signals Features e Fully
9. 3937A supplies the gate drive The MC33937A also provides under voltage hold off and over current Under voltage hold off threshold value is 8V MC33937A has an implemented dead time insertion which can be configured using SPI The default dead time value is typically 15us One important design decision in a motor drive is the selection of gate drive impedance for the output transistors Resistor R14 R15 diode D8 and the MC33937A nominal 100mA current sinking capability determine gate drive impedance for the lower half bridge transistor A similar network is used on the upper half bridge These networks set the turn on gate drive impedance at approximately 100Q and the turn off gate drive to approximately 100mA These values produce transition times of approximately 285 ns Transition times of this length represent a carefully weighed compromise between power dissipation and noise generation Generally transition times longer than 250 ns tend to get power hungry at non audible PWM rates transition times under 50 ns create di dts so large that proper operation is difficult to achieve The 3 phase Low Voltage Motor Control Tower Module is designed with switching times at the higher end of this range to minimize noise Anti parallel diode softness is also a primary design consideration If the anti parallel diodes in an off line motor drive are allowed to snap the resulting di dts can cause noise management problems difficult to solve In general th
10. C33937A and provides an over current triggering function The shunt resistor is represented by a 0 05 ohm resistance WELWYN SMD precision resistor the same as the phase current measurement resistors 3 7 Safety Functions The MC33937A provides over current and under voltage functions Bus current feedback is filtered to remove spikes and this signal is fed into the MC33937A current comparator input ITRIP Therefore when bus current exceeds reference value set by trimmer R37 all six output transistors are switched off Once a fault state has been detected all six gate drivers are off until the fault state is cleared in by the CLINTO command or by switching the board off Then you can switch the power stage on The under voltage function is implemented internally The MC33937A s supply voltage is sensed internally If this voltage is lower than 8V the hold off circuit is evaluated and an interrupt is generated if set The MC33927 safety functions keep the driver operating properly and within safe limits Current limiting by itself however does not necessarily ensure that a board is operating within safe thermal limits The MC33927 has a thermal warning feature If the temperature rises above 170 C on one of the three detectors then an interrupt is generated if set The MC33927 driver has also other safety features such as desaturation detection phase error framing error write error after the lock and exiting RST All these features can
11. N1 Signal Select 14 ANO Signal Select 12 signal Table 6 TWR MC LV3PH Jumper Settings TWR MC LV3PH User s Manual Page 17 of 19 77 freescale semiconductor TWR MC LV3PH User s Manual Page 18 of 19 7 freescale semiconductor 6 Mechanical Form Factor The TWR MC LV3PH is designed for the Freescale Tower System as a side mounting peripheral and complies with the electrical and mechanical specification as described in Freescale Tower Electromechanical Specification 112 XC S B 0 11 2 freescale semiconductor Freescale and the Freescale logo are trademarks of Freescale Semiconductor Inc All other product or service names are the property of their respective owners Freescale Semiconductor Inc 2009 All rights reserved TWR MC LV3PH User s Manual Page 19 of 19
12. TSIS 047 LCD D2 LCD P2 C47 RTS3 516 048 LCD D3 LCD P3 C48 CTS3 TSI7 049 GND Ground X C49 GND Ground D50 GPIO23 C50 LCD 04 1 P4 D51 GPIO24 C51 LCD D5 LCD P5 D52 LCD D12 LCD P12 C52 LCD D6 LCD P6 D53 LCD D13 LCD P13 C53 LCD D7 LCD P7 D54 LCD D14 LCD P14 C54 LCD D8 LCD P8 D55 P SPI2 CS2 b C55 LCD D9 LCD P9 D56 IRQ O SPI2 CS3 b C56 LCD D10 LCD P10 D57 57 LCD D11 LCD 11 D58 58 TMR16 059 IRQ_L C59 TMR15 D60 IRQ_K C60 TMR14 061 C61 TMR13 D62 C62 LCD D15 LCD P15 D63 LCD D18 LCD P18 C63 LCD D16 LCD P16 D64 LCD D19 LCD P19 C64 LCD D17 LCD P17 D65 GND Ground X c65 GND Ground D66 EBI_AD20 LCD_P42 c66 EBI_BE_32_24_b LCD_P28 D67 EBI_AD21 LCD_P43 c67 EBI_BE_23_16_b LCD_P29 D68 EBI_AD22 LCD_P44 c68 EBI_BE_15_8_b LCD_P30 D69 EBI_AD23 LCD_P45 c69 EBI_BE_7_0_b LCD_P31 D70 EBI_AD24 LCD_P46 C70 EBI TSIZEO LCD P32 D71 EBI AD25 LCD P47 C71 EBI TSIZE1 LCD P33 D72 AD26 LCD P48 C72 EBI TS b LCD P34 D73 EBI_AD27 LCD P49 C73 EBI TBST b LCD P35 D74 AD28 LCD P50 C74 EBI TA b LCD P36 D75 AD29 LCD P51 C75 EBI CS4 b LCD P37 D76 EBI_AD30 LCD 52 C76 EBI CS3 b LCD P38 D77 AD31 LCD P53 C77 EBI CS2 b LCD P39 D78 LCD D20 LCD P20 C78 EBI CS1 b LCD 40 D79 LCD D21 LCD P21 C79 GPIO31 LCD P41 D80 LCD D22 LCD P22 C80 LCD D23 LCD P23 D81 ETH COL Ground X C81 GPIO26 Ground D82 ETH RXER C82 ETH MDC TWR MC LV3PH User s Manual Page 16 of 19 e
13. age This converter can supply up to 500 mA This voltage level serves the MC33269D linear regulator encoder and optionally entire tower system If the LM2594HVM converter operates properly the D7 green LED is lit 3 1 2 3 3V Power Supply An important voltage level for this board is 3 3V This voltage level is obtained from the MC33269D linear voltage regulator and can supply up to 800 mA 3 1 3 1 65V Voltage Reference Current sensing operational amplifiers use 1 65V voltage level connected to non inverted inputs This level is obtained from a precision voltage reference LM4041 D6 3 1 4 Analog Power Supply and Grounding For analog quantities sensing currents and voltages is used separated analog voltage 3 3V and ground This voltage level can be chosen from two sources One is separated from 3 3V digital power supply using an LC filter and the second source is from the primary elevator port A source selection is done via jumpers J2 and J3 3 2 Electrical Characteristics The electrical characteristics in table below apply to operations at 25 C with a 24 Vd c power supply voltage Input voltage maximal value can be higher than 24V A 50V maximal input voltage value is allowed but the DC bus BEMF sensing circuits need to be modified The divider resistors in these circuits need to be changed to increase sensing range up to 50V if required It prevents scaled quantities exceeding the maximally allowed input voltage value on
14. and R39 R42 and R40 R46 the gain is given by A R40 R39 R38 The input voltage is shifted up by 1 65V_REF to accommodate both positive and negative current swings A 400 voltage drop across the shunt resistor corresponds to a measured current range of 8 amps As a source for 1 65V_REF a precision shunt voltage reference LM4041 3 10 LED Indication This module also contains 8 LEDs as indicators 05 User LED diode for user defined purposes activated on high level D7 Indicates that the 5V level is properly generated D14 PWM AT indication LED activated on low level e D16 PWM AB indication LED activated on high level D18 indication LED activated on low level e D15 PWM BB indication LED activated on high level D17 PWM CT indication LED activated on low level D19 PWM CB indication LED activated on high level 3 11 Encoder Hall Effect Interace The TWR MC LV3PH contains an Encoder Hall Effect interface The circuit is designed to accept 3 to 5 0 encoder or Hall Effect sensor inputs Input noise filtering is supplied on the input path for the Encoder Hall Effect interface Filtered signals are then connected to the elevator main port 3 12 Brake An external brake resistor can be connected to dissipate re generative motor energy during periods of active deceleration or rapid reversal Under these conditions motor back EMF adds to the dc bus voltage Without a mea
15. ary and Secondary Elevator connectors Table provides the pinout for the Primary and Secondary Elevator Connector An X in the Used column indicated that there is a connection from the TWR MC LV3PH to that pin on the Elevator connector An X in the Jmp column indicates that a jumper is available that can configure or isolate the connection from the Elevator connector Table 4 TWR MC LV3PH Primary Elevator Connector Pinout TWR MC LV3PH Primary Connector Pin Usage Used Jmp Pin Name Usage Used Jmp 1 5 5 0V Power X A1 5V 5 0V Power B2 GND Ground X A2 GND Ground X B3 3 3V 3 3V Power X A3 3 3V 3 3V Power X B4 ELE_PS_SENSE Elevator Power Sense X A4 3 3V 3 3V Power X B5 GND Ground X A5 GND Ground X B6 GND Ground X A6 GND Ground X B7 SDHC_CLK SPI1 CLK A7 SCLO B8 SDHC D3 SPI1 CS1 b A8 SDAO B9 SDHC D3 SPI1 CSO b A9 GPIO9 CTS1 B10 SDHC CMD SPI1 MOSI A10 GPIO8 SDHC D2 B11 SDHC 00 5 1 MISO A11 GPIO7 SD WP DET B12 COL A12 ETH CRS B13 ETH RXER A13 ETH MDC 14 ETH_TXCLK 14 B15 ETH_TXEN 15 ETH_RXCLK B16 ETH_TXER 16 ETH_RXDV B17 ETH_TXD3 17 _ B18 ETH_TXD2 18 2 19 ETH_TXD1 19 ETH_RXD1 B20 ETH_TXDO A20 ETH_RXDO B21 GPIO1 RTS1 USER_LED X A21 SSI_MCLK B22 GPIO2 SDHC D1 BRAKE CONTROL X A22 SSI_BCLK B23 GPIO3 23 551 5 B24 CLKINO A24 SSI_RXD B25
16. be configured through SPI to trigger interrupts Detail information is available in the driver datasheet 3 8 Back EMF Signals Back EMF signals are included to support sensorless algorithms for brushless d c motors and dead time distortion correction for sinusoidal motors The raw phase voltage is scaled down by a voltage divider consisting of R47 and R48 phase A Output from this divider produces back EMF sense voltage BEMF_SENSE_A Resistor values are chosen such that a 36 3 volt of phase voltage corresponds to a 3 3 volt A D input BEMF_SENSE_A is terminated to the elevator main port 3 9 Phase Current Sensing Sampling resistors provide phase current information for all three phases Because these resistors sample current in the lower phase legs they do not directly measure phase current However given TWR MC LV3PH User s Manual Page 9 of 19 77 freescale semiconductor phase voltages for all three phases phase current can be constructed mathematically from the lower phase leg values This information can be used in vector control algorithms for AC induction motors Referencing the sampling resistors to the negative motor rail makes the measurement circuitry straightforward and inexpensive Current is sampled by resistor R7 phase A and amplified by the differential amplifier U5A This circuit provides a voltage output suitable for sampling on A D inputs An AD8656 is used as a differential amplifier With R38 R41
17. e peak to zero di dt should be approximately equal to the di dt applied to turning off the anti parallel diodes The IRFR540Z MOSFETs used in this design are targeted at this kind of reverse recovery 3 6 Bus Voltage and Current Feedback Bus voltage is scaled down by a voltage divider consisting of R74 R77 and R79 The values are chosen such that a 36 3 volt bus voltage corresponds to 3 3V at output V SENSE DCB V SENSE DCB is scaled at 91mV per volt of the DC bus voltage and is terminated on the main elevator port An additional output V SENSE DCB HALF provides a reference used in zero crossing detection V SENSE DCB HALF is scaled at 45 5mV per volt of the DC bus voltage and is also terminated on the main port TWR MC LV3PH User s Manual Page 8 of 19 77 freescale semiconductor Bus current is sampled by resistor R10 and amplified in either the MC33937A s operational amplifier or external operational amplifier U6B This circuit provides a voltage output suitable for sampling on A D analogue to digital inputs Both operational amplifiers are connected as differential amplifiers for bus current sensing with the equal gain given by A R40 R38 R39 The output voltage is shifted up by 1 65V_REF to accommodate positive and negative current swings 400 mV voltage drop across the sense resistor corresponds to a measured current range of 8 amps AMP_OUT signal is internally connected to the over current comparator of the M
18. ent magnet synchronous motor any one of the three phase windings can be connected here For brushless d c motors you must connect the wire colour coded for phase A into the connector terminal labeled A and so on for phase B and phase C Signal Pin Description 1 A Supplies power to motor phase A 2 B Supplies power to motor phase B 3 Supplies power to motor phase Table 2 Motor Connector J5 Signal Description 4 4 Encoder Hall effect Interface J8 The Encoder Hall Effect interface J8 is located on the right edge of the board The circuit is designed to accept 3 3V to 5 encoder or Hall Effect sensor inputs Input noise filtering is supplied on the input path to the Encoder Hall Effect interface Table 3 shows the Encoder Hall Effect interface pin description Pin 4 Pignal Description Name 1 45 0V Supplies power from the board to either ENCODER or Hall sensors TWR MC LV3PH User s Manual Page 11 of 19 77 freescale semiconductor GND ENCODER or Hall sensors ground Phase ENCODER or Hall Phase A input Phase ENCODER or Hall Phase B input Phase ENCODER or Hall Phase C input Table 3 Encoder Hall effect Interface J8 Signal Description 4 5 Elevator Connections The TWR MC LV3PH features two expansion card edge connectors that interface to Elevator boards in a Tower System the Prim
19. ns to dissipate excess energy an overvoltage condition could easily occur With an external dissipative resistor connected to J4 it serves to dissipate energy across the dc bus MOSEFET Q8 is turned by software when the bus voltage sensing circuit exceeds level set in software Power dissipation capability depends of course on the capability of the externally connected dissipative resistor The MIC4127YME is a dual MOSFET pre driver 5 0V tolerant This board uses its A channel to drive the braking resistance MOSFET TWR MC LV3PH User s Manual Page 10 of 19 27 freescale semiconductor 4 Signal Description This section provides more details about signals of input output connectors and jumpers of the TWR TWR MC LV3PH 4 1 Power Supply Input Connector J1 The power supply input connector labeled J1 accepts d c voltages from 12V to 50V 8A max The J1 connector is a 2 1mm power jack for plug in type DC power supply connections The board has reverse polarity protection Power applied to the board is indicated by a green color 5V LED 4 2 External Brake Resistor Interface J4 A brake resistor can be connected to brake resistor connector J4 The brake resistor allows power dissipation and can be controlled through the Brake control signal 4 3 Motor Connector 5 Power outputs to the motor are located on connector J1 Phase outputs are labeled A B and C Table 2 contains pin assignments On a perman
20. oter Connector Secondary Elevator Power Supply Connector Li Encoder HS Connector Brake Resistor Connector Primary Elevator BEMF Currents Sensing Header Analogue Voltage Selector Figure 2 TWR MC LV3PH Image 2 Reference Documents The documents listed below should be referenced for more information on the Freescale Tower system and the TWR MC LV3PH Refer to http www freescale com tower for the latest revision of all released Tower documentation TWR MC LV3PH Schematics TWR MC LV3PH Quick Start Guide e Freescale MC33937A Three Phase Field Effect Transistor Pre driver 3 Hardware Features This section provides more details about the features and functionality of the TWR MC LV3PH TWR MC LV3PH User s Manual Page 5 of 19 77 freescale semiconductor 3 1 Power Supply Freescale s 3 phase Low Voltage Motor Control Tower Module is a 3 phase power stage that will operate off d c input voltages of 12 to 24 volts 8 amps The module contains reverse polarity protection circuitry It is intended that the TWR MC LV3PH be powered from an external power supply of 12 to 24 volts 4 to 8 amps depending on used motor The module includes 5 0V and 3 3V supplies which are capable to provide power to entire Tower System 3 1 1 5V Power Supply The 5V level is generated by means of the LM2594HVM switching step down regulator see TWR MC LV3PH schematic which generates this level from bus volt
21. specified from 8 0V to 40V covers 12V and 24V automotive systems e Extended operating range from 6 0V to 58V covers 12V and 42V systems e Greater than 1 0A gate drive capability with protection e Protection against reverse charge injection from CGD and CGS of external FETs e Includes a charge pump to support full FET drive at low battery voltages e Dead time is programmable via the SPI port e Simultaneous output capability enabled via safe SPI command MC33937A supports very high current loads TWR MC LV3PH User s Manual Page 7 of 19 77 freescale semiconductor 3 4 SPI communication Freescale MC33937A driver uses SPI communication for operating parameter mode and interrupt setting Driver command and registers are described in a driver manual The selecction between two Chip Select signals is available on the board via two 0 ohm resistors R95 R96 see 5 1 3 5 3 Phase Bridge The output stage is configured as a 3 phase bridge with MOSFET output transistors It is simplified considerably by an integrated gate driver that has an over current under voltage and other safety features At the input pull down resistor R26 sets logic low in the absence of a signal for the low side transistor Open input pull down is important because the power transistors must stay off in the case of a broken connection or an absence of power on the daughter board Gate driver inputs are 3 3V compatible A Freescale device an MC3
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