EVAL-L9963E-NDS

EVAL-L9963E-NDS Data brief L9963E single node in a distributed BMS System Features • • • • • • • • • • Single node L9963E board for distributed multi-cell BMS To be used with EVAL-L9963E-MCU or EVAL-L9963E as second stage or stacked with additional EVAL-L9963E-NDS Measures from 4 to 14 cells in series, with 0 us desynchronization delay between samples. Supports also busbar connection without altering cell results Coulomb counter supporting pack overcurrent detection in both ignition on and off states Fully synchronized current and voltage samples 16-bit voltage measurement Communication between nodes through a 2.66 Mbps isolated serial communication with regenerative buffer, supporting dual access ring Transformer based isolation Up to 4 analog inputs for NTC sensing, plus PCB temperature sensing Hot-plug protection circuit Description Product status link EVAL-L9963E-NDS Product summary Order code EVAL-L9963E-NDS Reference EVAL-L9963E-NDS Evaluation board The EVAL-L9963E-NDS is a hardware tool for L9963E for Li-ION battery management application. The board is intended to be used as a single node in a distributed BMS. EVAL-L9963E-NDS is needed when the total number of battery cells to be managed exceeds 14. The number of nodes to be stacked depends on total battery voltage, additional nodes can be added via additional EVAL-L9963ENDS. A maximum of 31 total nodes beyond the base node EVAL-L9963E-MCU can be stacked. It has to be used in conjunction with EVAL-L9963E-MCU as second stage or stacked with additional EVAL-L9963E-NDS. EVAL-L9963E-NDS allows the user to manage up to 14 channels for cell voltage sensing, one channel for current sensing, and up to 4 analog input for temperature sensing (plus an additional on-board NTC to sense PCB temperature). The board provides additional protection for hot plug. EVAL-L9963E-NDS is not intended to be used as a standalone evaluation board but with EVAL-L9963E-MCU. DB4439 - Rev 1 - March 2021 For further information contact your local STMicroelectronics sales office. www.st.com EVAL-L9963E-NDS Block diagram 1 Block diagram EVAL-L9963E-NDS provides a single L9963E device with the external connectors for battery and isolated communication. Figure 1. EVAL-L9963E-NDS block diagram Isolated communication L9963E BMS Up to 14 cells LI -Ion battery HOT-PLUG Protection Isolated communication DB4439 - Rev 1 page 2/14 EVAL-L9963E-NDS Featured components 2 Featured components The EVAL-L9963E-NDS can be considered as an additional node in a distributed BMS system, the first stage should be implemented with an EVAL-L9963E-MCU or an EVAL-L9963E-NDS. In the following table there is a short description of all ST featured components. Table 1. Featured components Name L9963E DB4439 - Rev 1 Description Automotive chip for battery management applications page 3/14 EVAL-L9963E-NDS Minimum system requirements 3 Minimum system requirements • • • DB4439 - Rev 1 EVAL-L9963E-MCU as first stage of a distributed BMS system Power supply: at least 3 output 0 – 30 V (if possible 60 V): – 1 output to power L9963E (0:60 V) – 1 output to simulate Cells common mode voltage (0:60 V) – 1 output to simulate Cell voltage (0:5 V) page 4/14 EVAL-L9963E-NDS Connectors 4 Connectors Table 2. EVAL-L9963E-NDS connectors Name Description Configuration Isolated serial communication port: ISOL 1. Fault Line supply 2. ISOLm 3. ISOLp 4. FaultL USB Type A connector Isolated serial communication port: ISOH 1. Fault Line supply 2. ISOHm 3. ISOHp 4. FaultH USB Type A connector Battery connector: P2 DB4439 - Rev 1 1. Cell 14 2. Cell 12 3. Cell 10 4. Cell 8 5. Cell 6 6. Cell 4 7. Cell 2 8. Cell 0 9. Ground 10. Current sensor resistor negative pin 11. NTC 1- 12. NTC 2- 13. NTC3 - 14. NTC4 – 15. VBAT 16. Cell 13 17. Cell 11 18. Cell 9 19. Cell 7 20. Cell 5 21. Cell 3 22. Cell 1 23. Ground 24. Current sensor resistor positive pin 25. NTC 1+ 26. NTC 2+ 27. NTC3 + 28. NTC4 + Multi pin connector page 5/14 EVAL-L9963E-NDS Hot plug protection 5 Hot plug protection Figure 2. Hot plug protection circuit The structure in Figure 2 on the GND path will help with standing the hot plug by limiting the in rush current incoming from any L9963E pin connected to the centralized clamp. Working principle is the following: • When L9963E is OFF and no cell is connected, the VREG regulator is shut down and MHOT is safely kept off by the RPD pull down resistor. • Upon the first hot plug event, inrush current incoming from the centralized clamp is forced to flow into RHOT resistor, which offers proper limiting. • Any VDS voltage spike on MOSFET during hot plug could be coupled to the gate via the parasitic Miller capacitance. Unwanted turn-on is safely filtered by CGS, that helps keeping VGS below the threshold voltage. Hence the MOSFET will stay OFF during hot plug. • If the hot plug voltage is enough to guarantee L9963E powerup the MOSFET will be turned on by VREG regulator with a proper delay, obtained through RG gate resistor. • Finally, during L9963E normal operation the MOSFET will be ON, thus guaranteeing a very low impedance path (few mΩ) on the AGND line. – Such a small shift between L9963E GND and battery pack GND will not alter cell measurement at all, since cell ADCs are fully differential. Hence, both cell and sum of cells measurements will be accurate. – Moreover, since L9963E only drains few mA from the battery pack, error introduced on the VBAT stack measurement via internal voltage divider will be negligible. – Also the CSA used for Coulomb Counting features a fully differential architecture, thus being immune to such a small common mode shift. DB4439 - Rev 1 page 6/14 EVAL-L9963E-NDS Distributed BMS topology 6 Distributed BMS topology EVAL-L9963E-NDS is intended to be used in combination with EVAL-L9963E-MCU as an additional node of a distributed BMS system. EVAL-L9963E-MCU are needed as first stage and up to 31 EVAL-L9963E-NDS can be connected as additional nodes. In Figure 3 a possible layout for a distributed BMS using multiple EVAL-L9963ENDS together with EVAL-L9963E-MCU. Figure 3. Distributed BMS architecture (optional) dual ring configuration 14x Cells Isolated communication line Max 31x Nodes 14x Cells EVAL-L9963E-NDS EVAL-L9963E -MCU Multi Cell LI-ION battery EVAL-L9963E-NDS 14x Cells DB4439 - Rev 1 page 7/14 CELL13 C13 47nF MPZ2012S102ATD25 BD2 C0 C1 BD11 BD12 BD13 BD14 BD15 GND_EXT C66 47nF MPZ2012S102ATD25 GND_EXT C64 47nF MPZ2012S102ATD25 GND_EXT C50 47nF MPZ2012S102ATD25 GND_EXT C48 47nF MPZ2012S102ATD25 GND_EXT C46 47nF MPZ2012S102ATD25 GND_EXT CELL0 BD10 C44 47nF MPZ2012S102ATD25 GND_EXT CELL1 CELL2 CELL3 BD9 C42 47nF MPZ2012S102ATD25 GND_EXT CELL5 BD8 C37 47nF MPZ2012S102ATD25 GND_EXT CELL6 BD7 C34 47nF MPZ2012S102ATD25 GND_EXT CELL7 BD6 C29 47nF MPZ2012S102ATD25 GND_EXT CELL8 BD5 C25 47nF MPZ2012S102ATD25 GND_EXT CELL9 CELL4 C2 C3 C4 C5 C6 C7 C8 C9 BD4 C22 47nF MPZ2012S102ATD25 GND_EXT CELL11 CELL10 C10 C11 GND_EXT BD3 C12 C17 CELL12 47nF MPZ2012S102ATD25 C13 BD1 C5 47nF MPZ2012S102ATD25 GND_EXT C14 CELL14 VBAT_UP C1 D1 39 R67 39 R64 39 R59 39 R49 39 R45 39 R40 39 R36 39 R28 39 R24 39 R20 39 R16 39 R12 39 R9 R5 39 100 R69 100 100 R66 R61 100 100 R52 R47 100 100 R42 R38 100 100 R32 R27 100 R23 100 R19 100 100 R14 R11 100 100 R8 R4 VBAT 62 S13 58 56 S12 55 C18 54 10nF 52 B12_11 C23 S11 53 10nF 51 S10 50 C26 49 10nF 47 B10_9 C30 10nF S9 48 46 S8 45 C36 44 10nF 42 B8_7 C39 S7 43 10nF 41 S6 40 C43 39 10nF 37 B6_5 C45 S5 38 10nF 36 S4 35 C47 34 10nF 32 B4_3 C49 S3 33 10nF 31 S2 30 C51 29 10nF 27 B2_1 C65 S1 28 10nF 26 C14 10nF 61 S14 60 C6 10nF B14_1359 57 C2 2.2uF SMA6T68AY 100nF R1 R2 10k 0 Not Assembled GND BD16 MPZ2012S102ATD25 S1 C0 S2 B2_1 C1 S3 C2 S4 B4_3 C3 S5 C4 S6 B6_5 C5 S7 C6 S8 B8_7 C7 S9 C8 S10 B10_9 C9 S11 C10 S12 B12_11 C11 S13 C12 S14 B14_13 C13 C14 VBAT GND C3 100nF U1 L9963 ISOHm ISOHp CAP1 CAP2 VCOM VTREF VANA VREG GND GND ISENSEp ISENSEm GPIO3 GPIO4 GPIO5 GPIO6 GPIO7_WAKEUP GPIO2_FAULT_L GPIO1_FAULT_H ISOLm_NCS ISOLp_SDI C4 4.7uF 100nF C7 23 24 12 13 14 15 16 11 10 4 3 20 1 2 8 7 64 R2910nF GND 60.4 R25 C31 60.4 GND GPIO2 2 1 GND C35 22pF C32 22pF D3 C24 22pF C20 22pF 1 2 3 1 2 3 C62 2.2nF 3 4 SMA6T82AY D4 6K2 C61 2.2nF C60 2.2nF R57 1K5 2W C58 R54 100nF 10K 6K2 R48 6K2 ISOHm ISOLm_o_m NTC4+ NTC3+ NTC2+ NTC1+ GPIO6 C53 C52 C54 GPIO3 GPIO4 GPIO5 GND_EXT GND 1 2 3 4 SHELL ISOH 1 2 3 4 SHELL ISOL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 P1 15 16 17 18 19 20 21 22 23 24 25 26 27 28 C14 C12 C10 C8 C6 C4 C2 C0 3K9 R33 NTC1NTC2NTC3NTC4- C40 6.8nF GPIO8 STS8N6LF6AG 6 5 8 7 GND GND_EXT GND R35 NTCG163JH103HTDS R30 10K VTREF CGS 47nF Q2 RHOT 47 GND_EXT 1 2 100k 10K 3 RPD RG 4 JP1 VTREF VREG NTC1+ NTC2+ NTC3+ NTC4+ GND_EXT GND NTC_INTERNAL_INPUT VBAT_UP ISOHm ISOHp FAULTH GND VBAT_UP_2_IN ISOLm_o_m ISOLp_o_m FAULTL NTC1NTC2NTC3NTC4- VBAT_CELL C13 C11 C9 C7 C5 C3 C1 6.8nF 6.8nF 6.8nF 6.8nF C55 VTREF C59 R53 100nF 10K FAULTL VBAT_UP_2_IN ISOLm ISOLp ISOHm ISOHp GND_EXT GND_EXT C67 47nF ISOLp_o_m Not Assembled FAULTH L2 ESMIT-4180/A 3 R43 3 L3 ESMIT-4180/A C27 47nF R39 18k D2 C38 47nF Not Assembled C16 47nF Not Assembled 1 GND C21 1uF VCOM GND C33 1uF R6 300 VREG GND C28 47nF Not Assembled ISOHp 1 R34 6 5 4 6 5 4 VCOM USBLC6-2SC6Y I/O1 I/O1 GND Vbus I/O2 I/O2 U2 USBLC6-2SC6Y I/O1 I/O1 GND Vbus I/O2 I/O2 U3 GND VANA C12 Not Assembled 100nF C56 C57 R56 R55 100nF 10K 100nF 10K 1K5 2W R62 1K5 2W R58 1K5 2W PS2703-1 GND 100nF C11 VTREF VTREF Not Assembled 2.2uF C10 SZMM3Z4V7T1G GND R63 U4 GND C63 2.2nF 10k R50 2k R44 C41 2.2nF R17 10nF GND 60.4 R15 C19 60.4 R21 C9 VCOM 220nF 2.2uF C8 VCOM VREG GND 10k NTC_INTERNAL_INPUT 1uF Not Assembled 63 C15 5 19 21 18 GND Not Assembled RMREG 100k SPIEN GPIO8_SCK GPIO9_SDO STL8N10LF3 Q1 S D G 17 NPNDRV AGND GNDREF DGND CGND GND 22 25 9 6 65 3 DB4439 - Rev 1 1 7 2 VBAT_CELL EVAL-L9963E-NDS Evaluation board schematic EVAL-L9963E-NDS EVAL-L9963E-NDS Evaluation board schematic Figure 4. Board schematic page 8/14 EVAL-L9963E-NDS Board layout 8 Board layout Figure 5. Assembly TOP Figure 6. Inner 1 DB4439 - Rev 1 page 9/14 EVAL-L9963E-NDS Board layout Figure 7. Inner 2 Figure 8. Assembly BOTTOM DB4439 - Rev 1 page 10/14 EVAL-L9963E-NDS Revision history Table 3. Document revision history DB4439 - Rev 1 Date Version 03-Mar-2021 1 Changes Initial release. page 11/14 EVAL-L9963E-NDS Contents Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2 Featured components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Minimum system requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 5 Hot plug protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 Distributed BMS topology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 EVAL-L9963E-NDS Evaluation board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 Board layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 DB4439 - Rev 1 page 12/14 EVAL-L9963E-NDS List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. DB4439 - Rev 1 EVAL-L9963E-NDS block diagram Hot plug protection circuit. . . . . . . Distributed BMS architecture . . . . Board schematic . . . . . . . . . . . . . Assembly TOP . . . . . . . . . . . . . . Inner 1. . . . . . . . . . . . . . . . . . . . Inner 2. . . . . . . . . . . . . . . . . . . . Assembly BOTTOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 6 . 7 . 8 . 9 . 9 10 10 page 13/14 EVAL-L9963E-NDS IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. 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Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2021 STMicroelectronics – All rights reserved DB4439 - Rev 1 page 14/14