1. Out of the Box

The NXP analog product development boards provide an easy-to-use platform for evaluating NXP products. The boards support a range of analog, mixed-signal and power solutions. They incorporate monolithic integrated circuits and system-in-package devices that use proven high-volume technology. NXP products offer longer battery life, a smaller form factor, reduced component counts, lower cost and improved performance in powering state-of-the-art systems.

This page will guide you through the process of setting up and using the RDBESS772BJBEVB battery junction box.

1.1 Kit Contents and Packing List

Battery junction box (BJB)
One RDBESS772BJBEVB board
One power cord
Six high-voltage measurement cables
Two thermal sensor cables
One chassis cable
One GND cable
Two Hall sensor cables
One electrical transport protocol link (ETPL) cable
One plexiglass cover

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NextGet Hardware

2. Get Hardware

2.1 Board Features

The RDBESS772BJBEVB offers the following features.

Four positive high-voltage measurement inputs (up to 1800 V)
Two bipolar high-voltage measurement inputs (from −1800 V to 1800 V)
Isolation monitoring between high-voltage and low-voltage domains
Current measurement with a 100 µΩ shunt resistor (from −500 A to 500 A) with the option for redundancy using two shunt resistors
Shunt resistor temperature estimation
The option to have onboard shunt resistors or external shunt resistors
One hall sensor for current measurement (from 0 A to 500 A) with the option to have another Hall sensor
Precharge resistor temperature measurement with an external sensor
Two EEPROMs for calibration data storage
Galvanically isolated ETPL for communication
Printed-circuit board designed according to IEC 60664 (pollution degree 3, material group IIIb)

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2.2 Board Description

The RDBESS772BJBEVB supports battery current measurement, contactor and fuse monitoring, isolation monitoring and temperature measurement.

The battery management unit (BMU) communicates and controls the two MC33772CTC1AEs. These ICs provide the necessary features to fulfill the various measurements.

Figure 1 presents the block diagram of the board and its interaction with the rest of the system.

Figure 1. RDBESS772BJBEVB Block diagram

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2.3 Board Components

Figure 2 shows the connectors and the LEDs available on the RDBESS772BJBEVB.

Figure 2. Connectors and LEDs location

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NextConfigure Hardware

3. Configure Hardware

3.1 Power Supply

The RDBESS772BJBEVB usually receives power from the BMU on the connector J12. The power supply must follow the characteristics described in Table 1.

Table 1. Power supply characteristics

Symbol	Parameter	Conditions	Min	Typ	Max	Unit
VBJB_PWR_IN	Supply voltage	-	18	24	30	V
IBJB_PWR_IN	Supply current	RDBESS772BJBEVB in Normal mode; TPL communication active; all high voltage switches enabled	-	160	200	mA
IBJB_PWR_IN	Supply current	RDBESS772BJBEVB not active	-	20	-	mA

The BMU is in the low-voltage domain, whereas the BJB is in the high-voltage domain. Therefore, the RDBESS772BJBEVB embeds an isolated DC-DC converter to power the MC33772C and the measurement circuitry. This converter is by default an industrial component.

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3.2 Current Measurement

The RDBESS772BJBEVB redundantly measures the battery current with either two shunt resistors, two Hall sensors, or a combination from the two of them.