ST EVAL-L9963E-MCU Manuale utente

Introduction

The EVAL-L9963E-MCU is a hardware tool for evaluation and development and is ideal for rapid prototyping of a 48 V battery

management system (BMS) or as lower stage of a distributed BMS. This board can be used to evaluate the features of the

L9963E device and L9963T.

The EVAL-L9963E allows the user to connect up to 14 channels for cell voltage sensing, one channel for current sensing, and

up to 4 channels for temperature sensing (plus an additional on-board NTC to sense PCB temperature). The board provides an

onboard microcontroller with preloaded firmware intended to be used with STSW-L9963E GUI (graphical user interface).

EVAL-L9963E-MCU evaluation board

UM2846

User manual

UM2846 - Rev 1 - March 2021

For further information contact your local STMicroelectronics sales office.

www.st.com

1Hardware description

The EVAL-L9963E-MCU board provides maximum flexibility, giving access to all pins to simplify the evaluation

and debug phase of the device.

1.1 Block diagram

Figure 1. EVAL-L9963E-MCU block diagram

FTDI

(VCP)

USB

RS232

JTAG uC

L9963T

Tranceiver

L9963T

Tranceiver

Up to

14 cells

LI-Ion

battery

L9001

Power

supply

ISO communication

BMS

L9963E

1.2 Featured components

The EVAL-L9963E-MCU can be considered a reference design for a 48 V BMS or as a first layer of a distributed

BMS system. In the following table there is a short description of all the ST featured components.

Table 1. Featured components

Name Description

L9963E Automotive chip for battery management applications

L9963T Automotive SPI to isolated SPI transceiver

L9001 Automotive power supply IC with multiple voltage regulators

SPC574S64E3 32-bit Power Architecture MCU for automotive chassis and safety applications

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Hardware description

UM2846 - Rev 1 page 2/23

1.3 Board description

Figure 2. Board top view

Figure 3. Main components and connectors

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Board description

UM2846 - Rev 1 page 3/23

2Jumpers and connectors

2.1 Mother board jumpers and connectors

Table 2. Motherboard jumpers and connectors

Name Description Type

X1 External power supply connector Jack

P1 USB connector for PC communication Mini USB connector

ISOPORT 1

Isolated serial communication port:

USB type A connector

1- VBAT

2- ISOH- (From L9963E)

3- ISOH+ (From L9963E)

4- FaultH

ISOPORT 2

Isolated serial communication port:

USB type A connector

1- N.C.

2- ISO- (from L9963T)

3- ISO+ (from L9963T)

4- N.C.

Battery connector:

Multi pin connector

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- NTC1-

12- NTC2-

13- NTC3-

14- NTC4-

15- VBAT

16- cell 13

17- cell 11

18- cell 9

19- cell 7

20- cell 5

UM2846

Jumpers and connectors

UM2846 - Rev 1 page 4/23

Name Description Type

21- cell 3

Multi pin connector

22- cell 1

23- ground

24- current sensor resistor positive pin

25- NTC1+

26- NTC2+

27- NTC3+

28- NTC4+

JP2 L9963T (U16) ISO- output selection 1-2 ISO- redirected to ISOPORT 1_1

2-3 ISO- redirected to L9963E

JP3 L9963T (U16) TX amplitude selection

1-2 high amplitude/high threshold (1)

2-3 low amplitude/low threshold (1)

Unconnected : highamplitude/high threshold

JP4 L9963T (U16) SPI master clock selection

1-2 minimum frequency (1)

2-3 maximum frequency (1)

Unconnected: minimum frequency

JP5 L9963T (U16) transmitter enable signal

1-2 enable the TX activity (1)

2-3 disable the TX activity (1)

Unconnected : controlled by μc (PD9)

JP6 L9963T (U16) ISO+ output selection 1-2 ISO- redirected to ISOPORT 1_1

2-3 ISO- redirected to L9963E

JP7 L9963T (U18) TX amplitude selection

1-2 high amplitude/high threshold (1)

2-3 low amplitude/low threshold (1)

Unconnected: high amplitude/high threshold

JP8 L9963T (U18) SPI master clock selection

1-2 minimum frequency (1)

2-3 maximum frequency (1)

Unconnected: minimum frequency

JP9 L9963T (U18) transmitter enable signal

1-2 enable the TX activity (1)

2-3 disable the TX activity (1)

Unconnected: controlled by μc (PD8)

JP12 L9001 (U26) watchdog disable (2) Connected: watchdog disabled

Unconnected: watchdog enabled

JP13 L9001 (U26) wake signal Connected: L9001 enabled

Unconnected :L9001 disabled

JP14 3.3 V - 5 V voltage selector 1-2 5 V

2-3 3.3 V

JP15 5 V selector 1-2 5 V from L9001

2-3 5 V from USB

JHot Hot plug voltage selector 1-2 VTREF

2-3 Vreg

1. See L9963T datasheet.

2. See L9001 datasheet.

UM2846

Mother board jumpers and connectors

UM2846 - Rev 1 page 5/23

Figure 4. P2 Battery connector

2.2 Default jumpers setting

Table 3. Jumpers configuration

Name Description Configuration

JP2 L9963T (U16) ISO- output selection 2-3 ISO- redirected to L9963E

JP3 L9963T (U16) TX amplitude selection 1-2: high amplitude/high threshold

JP4 L9963T (U16) SPI master clock selection Unconnected: minimum frequency

JP5 L9963T (U16) transmitter enable signal Unconnected: controlled by μc (PD9)

JP6 L9963T (U16) ISO+ output selection 2-3 ISO- redirected to L9963E

JP7 L9963T (U18) TX amplitude selection 1-2: high amplitude/high threshold

JP8 L9963T (U18) SPI master clock selection Unconnected: minimum frequency

JP9 L9963T (U18) transmitter enable signal Unconnected: controlled by μc (PD8)

JP12 L9001 (U26) watchdog disable (2) Connected: watchdog disabled

JP13 L9001 (U26) wake signal Connected: L9001 enabled

JP14 3.3 V - 5 V voltage selector 1-2 5 V

JP15 5 V selector 1-2 5 V from L9001

JHot Hot plug voltage selector 1-2 VTREF

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Default jumpers setting

UM2846 - Rev 1 page 6/23

2.3 Hot plug protection

Figure 5. Hot plug protection circuit

The structure shown in the Figure 5 on the GND path will help withstanding the hot plug by limiting the inrush

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 VTREG 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 VTREG

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 analog GND (GND_B) 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.

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Hot plug protection

UM2846 - Rev 1 page 7/23

3Getting started

3.1 System requirements

• EVAL-L9963E-MCU

• Mini USB to USB type A cable

• 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)

– 12 V power supply with 2.1 mm jack output, internal pin +

• L9963E evaluation GUI (please check STSW-L9963E user manual)

3.2 EVAL-L9963E-MCU board setup

3.2.1 Low voltage power supply

The 12 V power supply must be connected to X1 connector in order to properly supply the low voltage portion of

the EVAL-L9963E-MCU board.

Figure 6. Low voltage power supply

Jumper settings:

JP14 1-2 (L9001 output 5V)

JP15 1-2 (5V from L9001)

JP12 – JP13 closed (L9001 active)

If the power supply is properly working LED D10 and D3 will be switched ON when USB is connected to PC

UM2846

Getting started

UM2846 - Rev 1 page 8/23

3.2.2 L9963E external connection and power supply

Figure 7. L9963E external connection and power supply

3.2.3 Transceiver settings

Figure 8. Transceiver settings

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EVAL-L9963E-MCU board setup

UM2846 - Rev 1 page 9/23

3.2.4 USB to PC connection

Figure 9. USB to PC connection

3.2.5 Possible connection for battery simulation

In case a real battery is not available, it’s possible to use the following circuit to simulate the battery pack.

Figure 10. Battery simulation

UM2846

EVAL-L9963E-MCU board setup

UM2846 - Rev 1 page 10/23

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