TWR-MC-LV3PH User`s Guide
Contents
1. Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 9 Signal Description Table 5 TWR MC LV3PH Primary Elevator connector pinout continued TWR MC LV3PH Primary Connector SDHC_CLK SCLO SPI1_CLK B8 SDHC_D3 SDAO SPI1_CS1_b B9 SDHC_D3 GPIO9 CTS1 SPI1_CS0_b B10 SDHC_CMD GPIO8 SDHC_D2 SPI1_MOSI B11 SDHC_DO GPIO7 SPI1_MISO SD_WP_DET B12 ETH_COL A12 ETH_CRS B13 ETH_RXER A13 ETH_MDC B14 ETH_TXCLK A14 ETH_MDIO B15 ETH_TXEN A15 ETH_RXCLK B16 ETH_TXER A16 ETH_RXDV B17 ETH_TXD3 A17 ETH_RXD3 B18 ETH_TXD2 A18 ETH_RXD2 B19 ETH_TXD1 A19 ETH_RXD1 B20 ETH_TXDO ETH_RXDO B21 GPIO1 RTS1 USER_LED SSI_MCLK B22 GPIO2 SDHC_D1 BRAKE_CONTROL SSI_BCLK B23 GPIO3 SSI_FS B24 CLKINO SSI_RXD B25 CLKOUT1 SSI_TXD B26 GND Ground GND Ground X B27 AN7 AN3 B28 ANG _SENCE_C AN2 _SENSE_C K K _ SENSE_DCB BEMF_SENSE_C B29 AN5 AN1 _SENSE_B X X BEMF_SENSE_B B30 AN4 ANO _SENSE_A K K BEMF_SENSE_A B31 GND GND Ground X B32 DAC1 DACO B33 TMR3 TMR1 ENC_PHASE_B X B34 TMR2 TMRO ENC_PHASE_A X B35 GPIO4 GPIO6 B36 3 3V 3 3V 3 3 V Power X B37 PWM7 PWM3 PWM_BB X B38 PWM6 PWM2 PWM_BT X Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc Signal Descript2. 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 TWR MC LV3PH User s Guide Rev 1 07 2012 16 Freescale Semiconductor Inc Revision History 0 112 0 435 A 3 175 2 331 ore 0 075 7 Revision History Table 9 Revision history 0 06 2011 Initial release 07 2012 Table TWR MC LV3PH jumper settings updated TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 17 How to Reach Us Home Page www freescale com Web Support http www freescale com support USA Europe or Locations Not Listed Freescale Semiconductor Technical Information Center EL516 2100 East Elliot Road Tempe Arizona 85284 1 800 521 6274 or 1 480 768 2130 www freescale com support Europe Middle East and Africa Freescale Halbleiter Deutschland GmbH Technical Information Center Schatzbogen 7 81829 Muenchen Germany 44 1296 380 456 English 46 8 52200080 English 49 89 92103 559 German 33 1 69 35 48 48 French www freescale com support Japan Freescale Semiconductor Japan Ltd Headquarters ARCO Tower 15F 1 8 1 Shimo Meguro Meguro ku Tokyo 153 0064 Japan 0120 191014 or 81 3 5437 9125 support japan freescale com Asia Pacific Freescale Sem
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4. Freescale Semiconductor Document Number TWRMCLV3PHUG Miscellaneous Self Covered Rev 1 07 2012 TWR MC LV3PH User s Guide Contents 1 Ove rv i ew 1 ORE EEEN AAE AT NEEE E 1 The 3 phase Low Voltage Motor Control board TWR MC Reference Documents 00eoenooonasananenanenawananene senene 3 LV3PH is a peripheral Tower System Module With one of the available MCU tower modules 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 Hardware Peahutes sesana akak Ana aenak nk aan Apane agan A kaki 3 Signall BSS OCS PARE EN EEN KN 8 Coniguration Seting sas anakan aaa Kp ak aa pa NR cesses 15 Mechanical Fornm Pastor sis csscaccsssecivicsnsasshbetideaaieeics 16 YA A un A W N Revision FUE EEN TA A NG NE Kaga 17 e Power supply voltage input 12 24 VDC extended up to 50 V see Electrical Characteristics for details e Output current up to 8 amperes A Power supply reverse polarity protection circuitry e 3 phase bridge inverter 6 MOSFET s e 3 phase MOSFET gate driver with over current and under voltage protection e 3 phase and DC 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 se
5. 5V level is properly generated D14 PWWM_AT indication LED low level D16 PWM_AB indication LED high level D18 PWM_BT indication LED low level D15 PWM_BB indication LED high level D17 PWM_LCT indication LED low level D19 PWM_CB indication LED high level TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 7 Signal Description 3 11 Encoder Hall Effect Interface The TWR MC LV3PH contains an Encoder Hall Effect interface The circuit is designed to accept 3 3 V to 5 0 V 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 regenerative motor energy during periods of active deceleration or rapid reversal Under these conditions motor back EMF adds to the DC bus voltage Without a means to dissipate excess energy an overvoltage condition could easily occur An external dissipative resistor connected to J4 can serve to dissipate energy across the DC bus MOSEFET 08 is turned on by software when the bus voltage sensing circuit exceeds the level set in that software Power dissipation capability depends on the capability of the externally connected dissipative resistor The MIC4127YME is a 5 0 V tolerant dual MOSFET pre driver This board uses its A channel to drive the braking resistance MOSFET
6. or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which failure of the Freescale Semiconductor product could create a situation where personal injury or death may occur Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application Buyer shall indemnify Freescale Semiconductor and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claims alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part RoHS compliant and or Pb free versions of Freescale products have the functionality and electrical characteristics as their non RoHS complaint and or non Pb free counterparts For further information see http www freescale com or contact your Freescale sales representative For information on Freescale s Environmental Products program go to http www freescale com epp Freescale and the Freescale logo are trademarks of Freescale Semiconductor Inc All other product or service names are the property of their respective owners 2011 2012 Freescale Semiconductor Inc ey
7. 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 DC voltages from 12 V to 50 V 8 A maximum The J1 connector is a 2 1 mm 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 5 V LED 4 2 External Brake Resistor Interface J4 A brake resistor can be connected to brake resistor connector J4 allowing for power dissipation This can be controlled through the Brake control signal 4 3 Motor Connector J5 Power outputs to the motor are located on connector J1 Phase outputs are labeled A B and C Table 3 contains pin assignments On a permanent magnet synchronous motor any one of the three phase windings can be connected here For brushless DC motors you must connect the wire color coded for phase A into the connector terminal labeled A and so on for phase B and phase C TWR MC LV3PH User s Guide Rev 1 07 2012 8 Freescale Semiconductor Inc Signal Description Table 3 Motor Connector J5 signal description 1 A Supplies power to motor phase A B Supplies power to motor phase B C Supplies power to motor phase C 4 4 Encoder Hall Effect Interface J8 The Encoder Hall Effect interface J8 is located on the right edge of the board The
8. A81 GND Ground X B82 3 3V 3 3V Power A82 3 3V 3 3V Power X TWR SER2 Secondary Connector D1 5V C1 5V D2 GND Ground GND X D3 3 3V 3 3V D4 ELE_PS_SENSE 3 3V D5 GND Ground GND X D6 GND Ground GND X D7 SPI2_CLK SCL2 D8 SPI2_CS1_b SDA2 D9 SPI2_CS0_b GPIO25 D10 SPI2_MOSI ULPI_STOP SPI2_MISO C11 ULPI_CLK D12 ETH_COL C12 GPIO26 D13 ETH_RXER C13 ETH_MDC D14 ETH_TXCLK C14 ETH_MDIO D15 ETH_TXEN C15 ETH_RXCLK D16 GPIO18 C16 ETH_RXDV D17 GPIO19 C17 GPIO27 SDHC_D4 SDHC_D6 D18 GPIO20 C18 GPIO28 SDHC_D5 SDHC_D7 D19 ETH_TXD1 C19 ETH_RXD1 D20 ETH_TXDO C20 ETH_RXDO Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 12 Freescale Semiconductor Inc Signal Description Table 6 TWR MC LV3PH Secondary Elevator connector pinout continued TWR SER2 Secondary Connector D21 ULPI_NEXT ULPI_DATAO USB1_DM USB3_DM D22 ULPI_DIR ULPI_DATA1 USB1_DP USB3_DP D23 UPLI_DATAS ULPI_DATA2 USB2_DM USB4_DM D24 ULPI_DATAG6 ULPI_DATAS USB2_DP USB4_DP D25 ULPI_DATA7 ULPI_DATA4 D26 GND Ground GND K D27 LCD_HSYNC AN11 LCD_P24 D28 LCD_VSYNC AN10 LCD_P25 D29 AN13 AN9 D30 AN12 AN8 D31 GND Ground GND X D32 LCD_CLK GPIO29 LCD_P26 D33 TMR11 TMR9 D34 TMR10 T
9. SPI command Supports very high current loads 3 4 SPI Communication Freescale MC33937A driver uses SPI communication for operating parameter mode and interrupt settings Driver command and registers are described in a driver manual The selection between two Chip Select signals is available on the board via two 0 ohm resistors R95 and R96 see Zero Ohm Resistors 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 TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc Ul Hardware 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 expansion board Gate driver inputs are 3 3 V compatible The MC33937A supplies the gate drive and also provides under voltage hold off and over current The under voltage hold off threshold value is 8 V MC33937A has an implemented dead time insertion which can be configured using SPI The default dead time value is typically 15 us 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 100 mA
10. 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 100 Q and the turn off gate drive to approximately 100 mA 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 Transition times longer than 250 ns tend to use too much power at non audible PWM rates and transition times under 50 ns create di dts so large that optimal 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 difficult noise management problems In general the peak to zero di dt must 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 so that a 36 3 V bus voltage corresponds to 3 3 V at output V_SENSE_DCB V_SENSE_DCB is scaled at 91mV per volt of the DC b
11. from a precision voltage reference LM4041 D6 3 1 4 Analog Power Supply and Grounding Separated analog voltage 3 3V and ground are used for analog quantities sensing currents and voltages This voltage level can be chosen from two sources one separated from 3 3V digital power supply using an LC filter or a second from the primary elevator port Source selection is done via jumpers J2 and J3 3 2 Electrical Characteristics The electrical characteristics in Table 1 apply to operations at 25 C with a 24 VDC power supply voltage Input voltage maximal value can be higher than 24 V A 50 V maximal input voltage value is allowed but the divider resistors in the DC bus and BEMF sensing circuits need to be modified to increase sensing range up to 50 V This prevents scaled quantities exceeding the maximally allowed input voltage value on the controller input pins CAUTION If an input voltage higher than 24 V is applied the plugged TWR modules might be damaged Table 1 Electrical characteristics 12 24 V DC Input Voltage Vdc Quiescent Current loc TBD mA Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 4 Freescale Semiconductor Inc eel Hardware Features Table 1 Electrical characteristics continued 1 5 1 7 Logic 1 Input Voltage Vin V Logic 0 Input Voltage Vit 0 9 1 V Input Resistance Rin 10 k Analogue Output Rang
12. values are chosen such that a 36 3 V of phase voltage corresponds to a 3 3 V AD 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 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 USA This circuit provides a voltage output suitable for sampling on AD inputs An AD8656 is used as a differential amplifier When R38 R41 and R39 R42 and R40 R46 the gain is given by _ __ R40 A R38 R39 The input voltage is shifted up by 1 65V_REF to accommodate both positive and negative current swings A 400 mV voltage drop across the shunt resistor corresponds to a measured current range of 8 A As a source for 1 65V_REF a Precision Shunt Voltage Reference LM4041 is used 3 10 LED Indication This module also contains eight LED indicators Table 2 LED indicators D5 User LED diode for user defined purposes high level D7 Indicates that the
13. 6 LCD_P32 D71 EBI_AD25 C71 EBI_TSIZE1 LCD_P47 LCD_P33 D72 EBI_AD26 C72 EBI_TS_b LCD_P48 LCD_P34 D73 EBI_AD27 C73 EBI_TBST_b LCD_P49 LCD_P35 D74 EBI_AD28 C74 EBI_TA_b LCD_P50 LCD_P36 D75 EBI_AD29 C75 EBI_CS4_b LCD_P51 LCD_P37 Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc Configuration Settings Table 6 TWR MC LV3PH Secondary Elevator connector pinout continued TWR SER2 Secondary Connector D76 EBI_AD30 C76 EBI_CS3_b LCD_P52 LCD_P38 D77 EBI_AD31 C77 EBI_CS2_b LCD_P53 LCD_P39 D78 LCD_D20 C78 EBI_CS1_b LCD_P20 LCD_P40 D79 LCD_D21 C79 GPIO31 LCD_P41 LCD_P21 D80 LCD_D22 C80 LCD_D23 LCD_P22 LCD_P23 D81 ETH_COL Ground K C81 GPIO26 Ground K D82 ETH_RXER C82 ETH_MDC 5 Configuration Settings There are several jumpers provided for isolation configuration and feature selection Refer to Table 7 and Table 8 for details The default installed jumper settings are shown in bold 5 1 Zero Ohm Resistors Table 7 TWR MC LV3PH jumper settings R61 MC33937A VPWR Placed Enables DCB_POS voltage to MC33937A Unplaced Disables DCB_POS voltage to MC33937A R86 U6B output Placed Enables _SENSE_DCB signal as output of U6B Unplaced Disables _SENSE_DCB signal as output of U6B R88 MC33937A AMP_OUT Placed Enables _SENSE_DCB signal as ou
14. MC LV3PH Quick Start Guide 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 Guide Rev 1 07 2012 Freescale Semiconductor Inc 3 Hardware Features 3 1 Power Supply Freescale s 3 phase Low Voltage Motor Control Tower Module is a 3 phase power stage that will operate off DC input voltages of 12 to 24 V 8 A The module contains reverse polarity protection circuitry TWR MC LV3PH is intended to be powered from an external power supply of 12 to 24 V 4 to 8 A depending on the motor used The module includes 5 0 V and 3 3 V supplies which are capable of providing power to the entire Tower System 3 1 1 5V Power Supply The 5V level is generated by means of the LM2594HVM switching step down regulator which generates this level from bus voltage This converter can supply up to 500 mA This voltage level serves the MC33269D linear regulator encoder and optionally the 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 level connected to non inverted inputs This level is obtained
15. MR8 D35 GPIO21 GPIO30 D36 3 3V 3 3V D37 PWM15 PWM11 D38 PWM14 PWM10 D39 PWM13 PWM9 D40 PWM12 PWM8 D41 CANRX1 RXD2 TSIO D42 CANTX1 C42 TXD2 TSI1 D43 GPIO22 C43 RTS2 TSI2 D44 LCD_OE C44 CTS2 TSI3 LCD_P27 D45 LCD_DO LCD_PO C45 RXD3 TSI4 D46 LCD_D1 LCD_P1 C46 TXD3 TSI5 D47 LCD_D2 LCD_P2 C47 RTS3 TSI6 D48 LCD_D3 LCD_P3 C48 CTS3 TSI7 D49 GND Ground K C49 GND Ground K D50 GPIO23 C50 LCD_D4 LCD_P4 D51 GPIO24 C51 LCD_D5 LCD_P5 Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 13 Signal Description Table 6 TWR MC LV3PH Secondary Elevator connector pinout continued TWR SER2 Secondary Connector D52 LCD_D12 LCD_D6 LCD_P6 LCD_P12 D53 LCD_D13 LCD_D7 LCD_P7 LCD_P13 D54 LCD_D14 LCD_D8 LCD_P8 LCD_P14 D55 IRQ_P LCD_D9 LCD_P9 SPI2_CS2_b D56 IRQ_O LCD_D10 SPI2_CS3_b LCD_P10 D57 IRQ_N LCD_D11 LCD_P11 D58 IIRQ_M TMR16 D59 IRQ_L TMR15 D60 IRQ_K TMR14 D61 IRQ_J TMR13 D62 IRQ_1 LCD_D15 LCD_P15 D63 LCD_D18 LCD_D16 LCD_P18 LCD_P16 D64 LCD_D19 LCD_D17 LCD_P19 LCD_P17 D65 GND Ground C65 D66 EBI_AD20 C66 EBI_BE_32_24 b LCD_P42 LCD_P28 D67 EBI_AD20 C67 EBI_BE_23_ 16_b LCD_P42 LCD_P29 D68 EBI_AD22 C68 EBI_BE_15_8 b LCD_P44 LCD_P30 D69 EBI_AD23 C69 EBI_BE_7_0_b LCD_P45 LCD_P31 D70 EBI_AD24 C70 EBI_TSIZEO LCD_P4
16. circuit is designed to accept 3 3 V to 5 V encoder or Hall Effect sensor inputs Input noise filtering is supplied on the input path to the Encoder Hall Effect interface Table 4 shows the Encoder Hall Effect interface pin description Table 4 Encoder Hall Effect interface J8 signal description 1 5 0V Supplies power from the board to either ENCODER or Hall sensors 2 GND ENCODER or Hall sensors ground 3 Phase A ENCODER or Hall Phase A input 4 Phase B ENCODER or Hall Phase B input 5 Phase C ENCODER or Hall Phase C input 4 5 Elevator Connections The TWR MC LV3PH features two expansion card edge connectors that interface to Elevator boards in a Tower System the Primary and Secondary Elevator connectors Table 5 provides the pinout for the Primary and Secondary Elevator Connector An X in the Used column indicates 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 5 TWR MC LV3PH Primary Elevator connector pinout TWR MC LV3PH Primary Connector B1 5V 5 0 V Power X A1 5V 5 0 V Power X B2 GND Ground X A2 GND Ground X B3 3 3V 3 3 V Power X A3 3 3V 3 3 V Power K B4 ELE_PS_SENSE Elevator Power K A4 3 3V 3 3 V Power K Sense B5 GND Ground K A5 GND Ground K B6 GND Ground K A6 GND Ground K
17. e Vout 0 3 3 V Bus Current Sense Voltage ISense 412 mV A Bus Current Sense Offset loffset 1 65 V Bus Voltage Sense Voltage VBus 91 mV V Bus Voltage Sense Offset Voffset 0 V Bus Continuous Output Current lc 8 A Total Power Dissipation per MOSFET Pp TBD W Dead time set by SW MC33937 toff 0 15 us 3 3 Three Phase Field Effect Transistor Pre driver The TWR MC LV3PH module uses the 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 and 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 specified from 8 0 V to 40 V covers 12 V and 24 V automotive systems e Extended operating range from 6 0 V to 58 V covers 12 V and 42 V systems e Greater than 1 0 A 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 Dead time is programmable via the SPI port Simultaneous output capability enabled via safe
18. iconductor China Ltd Exchange Building 23F No 118 Jianguo Road Chaoyang District Beijing 100022 China 86 10 5879 8000 support asia freescale com Document Number TWRMCLV3PHUG Rev 1 07 2012 Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductors products There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document Freescale Semiconductor reserves the right to make changes without further notice to any products herein Freescale Semiconductor makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit and specifically disclaims any liability including without limitation consequential or incidental damages Typical parameters that may be provided in Freescale Semiconductor data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts Freescale Semiconductor does not convey any license under its patent rights nor the rights of others Freescale Semiconductor products are not designed intended
19. ion Table 5 TWR MC LV3PH Primary Elevator connector pinout continued TWR MC LV3PH Primary Connector B39 PWM5 B40 PWM4 X B41 CANRXO B42 CANTXO B43 1WIRE B44 SPIO_MISO 101 B45 SPIO_MOSI I00 GNDA_ELV lh B46 SPIO_CSO_b VDDA ane B47 SPIO_CS1_b VREFA1 B48 SPIO_CLK VREFA2 B49 GND GND X B50 SCL1 GPIO14 B51 SDA1 GPIO15 B52 GPIO5 GPIO16 SPIO_WP SPIO_HOLD 103 IO2 B53 USBO_DP_PDOW GPIO17 N B54 USBO_DM_PDOW USBO_DM N B55 IRQ_H USBO_DP B56 IRQ_G USBO_ID B57 IRQ_F USBO_VBUS B58 IRQ_E TMR7 B59 IRQ_D TMR6 B60 IRQ_C TMR5 B61 IRQ_B TMR4 B62 IRQ_A RSTIN_b B63 EBI_ALE RSTOUT_b X EBI_CS1_b B64 EBI_CS0_b CLKOUTO B65 GND GND 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 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 Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 11 Signal Description Table 5 TWR MC LV3PH Primary Elevator connector pinout continued TWR MC LV3PH Primary Connector B74 EBI_D6 A74 EBI_AD6 B75 EBI_D5 A75 EBI_AD5 B76 EBI_D4 A76 EBI_AD4 B77 EBI_D3 A77 EBI_AD3 B78 EBI_D2 A78 EBI_AD2 B79 EBI_D1 A79 EBI_AD1 B80 EBI_DO A80 EBI_ADO B81 GND Ground
20. nsing circuitry e Motor power and signal connectors e User LED power on LED and 6 PWM LED diodes A block diagram for the TWR MC LV3PH is shown in Figure 1 lt 2011 2012 Freescale Semiconductor Inc Pg freescale Overview Motor Connector Mdotor Phases 6x PWM 3 Phase MOSFET H Bridge PYM LEDs Signal Conditioning CcC Bid soltage Surent haas Surants BEM s Analog Power Supply 3 3V Brake Control Driver amp MOSFET TMR Input Filter Encoder Brake Power HS Input Resistor Input Figure 1 TWR MC LV3PH Block Diagram Power Supplies 5 3 3V Primary Elevator Connection 0 om D D E O p a 5 gt 2 IT D O Q w TWR MC LV3PH User s Guide Rev 1 07 2012 2 Freescale Semiconductor Inc Reference Documents MOSFET H Bridge Secondary Elevator Motor Connector Power Supply Connector Encoder HS Connector eee Z mengga s8 ag mz E 5 st ia gt Mee i z a fi s nan nmi TTT TO Brake Resistor Connector BEME Currents Analog Voltage Primary Elevator Sensing Header Selector Figure 2 TWR MC LV3PH image 2 Reference Documents The documents listed below may 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 e TWR MC LV3PH Schematics e TWR
21. t state has been detected all six gate drivers are off until the fault state is cleared by the CLINTO command or by switching the board off You can then switch the power stage on TWR MC LV3PH User s Guide Rev 1 07 2012 6 Freescale Semiconductor Inc Hardware Features The under voltage function is implemented internally The supply voltage is also 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 be configured through SPI to trigger interrupts Detailed information is available in the driver datasheet 3 8 Back EMF Signals Back EMF signals are included to support sensorless algorithms for brushless DC 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
22. tput of MC33937A Unplaced Disables _SENSE_DCB signal as output of MC33937A R89 MC33937A INT output Placed Enables DRV_INT connection to elevator Unplaced Disables DRV_INT connection to elevator R89 MC33937A over current output Placed Enables DRV_OC connection to elevator Unplaced Disables DRV_OC connection to elevator R95 SPIO_CSO Placed Enables Chip Select 0 connection to elevator Unplaced Disables Chip Select 0 connection to elevator Table continues on the next page TWR MC LV3PH User s Guide Rev 1 07 2012 Freescale Semiconductor Inc 15 Mechanical Form Factor Table 7 TWR MC LV3PH jumper settings continued R96 SPIO_CS1 Placed Enables Chip Select 1 connection to elevator Unplaced Disables Chip Select 1 connection to elevator 5 2 Jumper Settings Table 8 TWR MC LV3PH jumper settings J2 VDDA Source Select 1 2 Internal on board source of analog 3 3 V 2 3 Elevator source of analog 3 3 V J3 VSSA Source Select 1 2 Internal on board source of analog GND 2 3 Elevator source of analog GND J10 AN2 Signal Select 1 2 Phase C current signal 2 3 Back EMF phase C J11 AN1 Signal Select 1 2 Phase B current signal 2 3 Back EMF phase B J12 ANO Signal Select 1 2 Phase A current signal 2 3 Back EMF phase A J13 AN6 Signal Select 1 2 Phase C current signal 2 3 DC Bus Current J14 AN5 Signal Select 1 2 Phase A current signal 2 3 DC Bus Voltage Half
23. us 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 5 mV per volt of the DC bus voltage and is also terminated on the main port 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 AD analog to digital inputs Both operational amplifiers are connected as differential amplifiers for bus current sensing with the equal gain given by _ _ R40 A R38 R39 The output voltage is shifted up by 1 65V_REF to accommodate positive and negative current swings A 400 mV voltage drop across the sense resistor corresponds to a measured current range of 8 A AMP_OUT signal is internally connected to the over current comparator of the MC33937A 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 the bus current exceeds the reference value as set by trimmer R37 all six output transistors are switched off After a faul
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