5.3.1.2. ADI ADES1830-based 16-Cell Slave v0.9.0

Note

The changelog for this release is found at v0.9.0.

5.3.1.2.1. Overview

Important

The following description only applies for the ADI ADES1830-based 16 cell BMS-Slave hardware version 0.9.0.

Hint

All connector pinouts described below follow the Convention for Molex Micro-Fit 3.0 Connector Pin Numbering.

5.3.1.2.2. Specifications

5.3.1.2.2.1. Electrical Ratings

The current consumption from the module has been measured at 57.6 V module voltage, which is equivalent to a cell voltage of 3.6 V per cell. No sense lines have been connected for this measurement (as the impact of cell voltage sensing is negligible on the current consumption).

Table 5.51 Electrical Ratings

Description	Minimum	Typical	Maximum	Unit
Battery Module Voltage	11	–	80	V
Single Battery Cell Voltage	0	–	5	V
Temperature Sensor Inputs	–	10k	–	\({\Omega}\)
Current consumption: AFE active	–	TBD	–	mA

5.3.1.2.2.2. Mechanical Dimensions

Table 5.52 Mechanical Dimensions

Description	Value	Unit
Width	100	mm
Length	160	mm
Height	15	mm
Weight	(TBC) 88	g

5.3.1.2.2.3. Block Diagram

The block diagram of the BMS-Slave is shown in Fig. 5.7.

Fig. 5.7 BMS-Slave 16-Cell Block Diagram

5.3.1.2.2.4. Schematic and Board Layout

More information about the board schematic and layout files can be found in section Design Resources.

5.3.1.2.3. Functions

5.3.1.2.3.1. Cell Voltage Measurement

The cell voltage sense lines are input on the connector J400. The pinout is described in Table 5.53.

Table 5.53 Cell voltage sense connector

Pin	Signal	Direction	Description
1	VBAT-	Input	Battery module negative terminal
2	CELL_0+	Input	Cell 0 positive terminal
3	CELL_2+	Input	Cell 2 positive terminal
4	CELL_4+	Input	Cell 4 positive terminal
5	CELL_6+	Input	Cell 6 positive terminal
6	CELL_8+	Input	Cell 8 positive terminal
7	CELL_10+	Input	Cell 10 positive terminal
8	CELL_12+	Input	Cell 12 positive terminal
9	CELL_14+	Input	Cell 14 positive terminal
10	VBAT+	Input	Battery module positive terminal
11	not connected	-	-
12	not connected	-	-
13	CELL_0-	Input	Cell 0 negative terminal
14	CELL_1+	Input	Cell 1 positive terminal
15	CELL_3+	Input	Cell 3 positive terminal
16	CELL_5+	Input	Cell 5 positive terminal
17	CELL_7+	Input	Cell 7 positive terminal
18	CELL_9+	Input	Cell 9 positive terminal
19	CELL_11+	Input	Cell 11 positive terminal
20	CELL_13+	Input	Cell 13 positive terminal
21	CELL_15+	Input	Cell 15 positive terminal
22	not connected	-	-
23	not connected	-	-
24	not connected	-	-

The VBAT+ and VBAT- connection is used for the internal power supply of the slave board.

The cell input lines are filtered by differential capacitor filter: both possibilities are provided on the PCB of the BMS-Slave. More information on the corner frequency of this filtering can be found in the schematic. The differential capacitor filter can be used when noise is less frequent or the design is subjected to cost optimization.

5.3.1.2.3.2. Passive Cell Balancing

The passive balancing circuit is realized by a series connection of two 30 \({\Omega}\) discharge-resistors that can be connected to each single cell in parallel. The balancing process is controlled by the ADI ADES1830 monitoring IC. The resistor value of 2x 30 \({\Omega}\) results in a balancing current of about 60 mA at a cell voltage of 3.6 V. This current results in a power dissipation of about 0.2W per balancing channel (at 3.6 V).

5.3.1.2.3.3. Temperature Sensor Measurement

The cell temperature sensors are connected to the connectors J403.

The pinout is described in Table 5.54.

Table 5.54 Temperature sensor connector

Pin	Signal	Direction	Description
1	T-SENSOR_0	Input	NTC Sensor 0 terminal 1
2	T-SENSOR_1	Input	NTC Sensor 1 terminal 1
3	T-SENSOR_2	Input	NTC Sensor 2 terminal 1
4	T-SENSOR_3	Input	NTC Sensor 3 terminal 1
5	T-SENSOR_4	Input	NTC Sensor 4 terminal 1
6	T-SENSOR_5	Input	NTC Sensor 5 terminal 1
7	T-SENSOR_6	Input	NTC Sensor 6 terminal 1
8	T-SENSOR_7	Input	NTC Sensor 7 terminal 1
9	T-SENSOR_8	Input	NTC Sensor 8 terminal 1
10	T-SENSOR_9	Input	NTC Sensor 9 terminal 1
11	VBAT-	Input	NTC Sensor 0 terminal 2
12	VBAT-	Input	NTC Sensor 1 terminal 2
13	VBAT-	Input	NTC Sensor 2 terminal 2
14	VBAT-	Input	NTC Sensor 3 terminal 2
15	VBAT-	Input	NTC Sensor 4 terminal 2
16	VBAT-	Input	NTC Sensor 5 terminal 2
17	VBAT-	Input	NTC Sensor 6 terminal 2
18	VBAT-	Input	NTC Sensor 7 terminal 2
19	VBAT-	Input	NTC Sensor 8 terminal 2
20	VBAT-	Input	NTC Sensor 9 terminal 2

Standard 10 \({k\Omega}\) NTC resistors are recommended for use. When using other values than these, the series resistors (R517-R526) on the board may have to be adjusted. Please note that the accuracy of the internal voltage reference VREF2 decreases heavily with a load of over 3 mA. Using 10x 10 \({k\Omega}\) NTC resistors with the corresponding 10 \({k\Omega}\) series resistors results in a current of 1.5mA (at 20 °C) which is drawn from VREF2.

Each 10 temperature sensors are connected to an GPIO pin of the ADI ADES1830.

5.3.1.2.3.4. isoSPI Daisy Chain Connection

The data transmission between the slaves and between the slaves and BMS master uses the isoSPI interface. The isoSPI signals are input/output on the connectors J501/J402. The isoSPI ports are bidirectional, that means they can be used in forward and reverse direction. The isoSPI connections are isolated galvanically using pulse transformers (T500/T501).

The pinout of the isoSPI connectors is described in Table 5.55 and Table 5.56.

Table 5.55 isoSPI Daisy Chain Input Connectors

Pin	Daisy Chain
1	IN+ ADI ADES1830
2	IN- ADI ADES1830

Table 5.56 isoSPI Daisy Chain Output Connectors

Pin	Daisy Chain
1	OUT+ ADI ADES1830
2	OUT- ADI ADES1830

5.3.1.2.4. Software Driver Implementation

The driver implementation for this AFE is documented at ADI ADES1830.