Getting Started with the EVBMA777T and EVBMA8420T

Last Modified: Dec 19, 2024 new Supports EVBMA777T2

Contents of this document

  • 1

    Out of the Box

  • 2

    Get Hardware

  • 3

    Configure Hardware

Purchase your EVBMA777T2

Contents of this document

1. Out of the Box

The EVBMA777T; EVBMA8420T allows the user to exercise all the functions of the MC33777A; BMA8420 battery junction box controller IC. Most pins of the MC33777A; BMA8420 are accessible via a connector. The user can configure the IC to evaluate all use cases.

1.1 Kit Contents and Packing List

The EVBMA777T and EVBMA8420T contents include:

  • One electrical transport protocol link (ETPL) communication cable
  • One power supply cable
  • Four two-position connectors
  • Two 12-position connectors

1.2 Additional Hardware

In addition to the kit contents, the following hardware is necessary or beneficial when working with this kit.

  • Mandatory +24 V and +100 mA power supply
  • Optional voltage sources (to test the measurements)
  • Optional power resistors (to test the pyrotechnic switch controller)
  • Optional negative temperature coefficient (NTC) resistor (to test temperature measurement)

NextGet Hardware

2. Get the Hardware

2.1 Board Features

The main features of the EVBMA777T and EVBMA8420T are:

  • Isolated power supply
  • ETPL communication
  • LED indicator for supply voltages and operation modes
  • Four current measurement inputs
  • Two external temperature measurement channels
  • All input and outputs of the MC33777A; BMA8420 are accessible with connectors
  • Energy reservoir capacitor for pyrotechnic switch control
  • EEPROM connected to the MC33777A; BMA8420 in I2C

2.2 Connectors

The EVBMA777T; EVBMA8420T has multiple connectors for interfacing a power supply, a controller, or external instruments.

Figure 1 shows the location of the connectors.

Figure 1. Connector location

Table 1. Connector description

Pin Connection Description
Power supply (J13)
J13.1 24V+ positive power supply terminal
J13.2 24V- power supply isolated ground
ETPL communication (J7)
J7.1 TPL1P ETPL positive input/output from/to lower node
J7.2 TPL1N ETPL negative input/output from/to lower node
ETPL communication (J8)
J8.1 TPL2P ETPL positive input/output from/to upper node
J8.2 TPL2N ETPL negative input/output from/to upper node
Primary ISENSE inputs (J3)
J3.1 PRM_ISENSEP primary positive current measurement input
J3.2 PRM_ISENSEN primary negative current measurement input
Secondary ISENSE inputs (J4)
Pin Connection Description
J4.1 SEC_ISENSEP secondary positive current measurement input
J4.2 SEC_ISENSEN secondary negative current measurement input
Primary VISENSE inputs (J5)
J5.1 PRM_VISENSEP primary positive current/voltage measurement input
J5.2 PRM_VISENSEN primary negative current/voltage measurement input
Secondary VISENSE inputs (J6)
J6.1 SEC_VISENSEP secondary positive current/voltage measurement input
J6.2 SEC_VISENSEN secondary negative current/voltage measurement input
Primary external temperature measurement (J11)
J11.1 PRM_IO7 primary external NTC terminal
J11.2 GND primary external NTC terminal
Secondary external temperature measurement (J12)
J12.1 SEC_IO7 secondary external NTC terminal
J12.2 GND secondary external NTC terminal
Primary I/O and reference voltage (J1)
J1.1 PRM_IO6 primary input/output 6
J1.2 PRM_IO5 primary input/output 5
J1.3 GND ground
J1.4 PRM_IO4 primary input/output 4
J1.5 PRM_IO3 primary input/output 3
J1.6 GND ground
J1.7 PRM_IO2 primary input/output 2
J1.8 PRM_IO1 primary input/output 1
J1.9 GND ground
J1.10 PRM_IO0 primary input/output 0
J1.11 PRM_VREF2V5 primary 2.5 V reference
J1.12 PRM_VREF5V0 primary 5 V reference
Pin Connection Description
Secondary I/O and reference voltage (J2)
J2.1 SEC_IO6 secondary input/output 6
J2.2 SEC_IO5 secondary input/output 5
J2.3 GND ground
J2.4 SEC_IO4 secondary input/output 4
J2.5 SEC_IO3 secondary input/output 3
J2.6 GND ground
J2.7 SEC_IO2 secondary input/output 2
J2.8 SEC_IO1 secondary input/output 1
J2.9 GND ground
J2.10 SEC_IO0 secondary input/output 0
J2.11 SEC_VREF2V5 secondary 2.5 V reference
J2.12 SEC_VREF5V0 secondary 5 V reference
Primary pyrotechnic switch controller (J9)
J9.1 PRM_PSCHS primary high side output of PSC
J9.2 PRM_PSCLS primary low side output of PSC
Secondary pyrotechnic switch controller (J10)
J10.1 SEC_PSCHS secondary high side output of PSC
J10.2 SEC_PSCLS secondary low side output of PSC

Figure 2. Connector part number

Connector Manufacturer Part number Mating connector
J1, J2 Phoenix 1754630 1757116
J7, J8 Molex 43650-0213 43645-0200
J3, J4, J5, J6, J9, J10, J11, J12, J13 Phoenix 1754436 1757019

2.3 Test points

The EVBMA777T; EVBMA8420T offers multiple test points to access signals close to the MC33777A; BMA8420.

Figure 2. show the location of the test points.

Figure 2. Test point location

Table 3 list the test points

Table 3. Test point description

Connector Manufacturer Part number Mating connector
J1, J2 Phoenix 1754630 1757116
J7, J8 Molex 43650-0213 43645-0200
J3, J4, J5, J6, J9, J10, J11, J12, J13 Phoenix 1754436 1757019

2.4 Jumpers

The EVBMA777T; EVBMA8420T has jumpers to configure MC33777A; BMA8420 signals.

Figure 3. shows the location of the jumpers.

Figure 3. Jumper location

J15 connects an LED to PRM_VDDC of the MC33777A; BMA8420. The LED signals that the device is in active mode. Removing the jumper disables the feature.

J16 connects an LED to SEC_VDDC of the MC33777A; BMA8420. The LED signals that the device is in active mode. Removing the jumper disables the feature.

J14 connects by default VDDIO to SEC_VDDC (jumper between pin 1 and pin 2). The user can power VDDIO with another voltage by moving the jumper (between pin 2 and pin 3) and by applying a voltage on TP6.

PreviousOut of the Box
NextConfigure Hardware

3. Configure the Hardware

3.1 Configuring the Hardware

This section describes the typical setup to configure EVBMA777T; EVBMA8420T and evaluate the MC33777A; BMA8420 current measurement feature.

Figure 4.Hardware setup

Table 4 lists the material required to set up the test.

Table 4.Bill of material

Material Characteristics
Personal computer With Windows 7 or higher
KIT-PC2TPL communication board
USB-to-UART cable Included in the KIT-PC2TPL kit
EVBMA777T; EVBMA8420T evaluation board
ETPL cable Included in the EVBMA777T; EVBMA8420T kit
Power supply cable Included in the EVBMA777T; EVBMA8420T kit
Interface connectors Included in the EVBMA777T; EVBMA8420T kit
External power supply Output voltage +24 V, output current +100 mA minimum
External voltage source (emulating the current measurement) Output voltage in [-300 mV; + 300 mV]

The USB-to-UART cable interfaces the KIT-PC2TPL (connector J5) communication board with the computer (USB port).

The ETPL cable links the KIT-PC2TPLEVB (connector J1) with the EVBMA777T; EVBMA8420T evaluation board (connector J7 or J8).

PreviousGet Hardware
NextDesign Resources

Design Resources

Board Information

Additional References

In addition to our EVBMA777T2 page, you may also want to visit:

PreviousConfigure Hardware