Versions Compared

Version Old Version 6 New Version 7
Changes made by

Liam Hawkins

Liam Hawkins

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

  • Check for continuity between 12 V, ISO12 V, GND, ISO GND, and 5 V (all of these should be isolated from each other).
  • The board can now be powered by connecting a power supply set to 12 V between 12 V and GND.
  • Measure the voltage between the isolated 12 V and ISO GND, and 5 V and ISO GND.
  • Turn off the power supply.

Current Sense Output

...

  • Supply 12 V between 12 V and GND.
  • Connect a wire to the connector near the center of the board labelled VREF.
  • Measure the voltage between the wire and ISO GND. The value should be about 2.5 V relative to ISO GND.
  • Connect a wire to the connector near the center of the board labelled IN+.
  • Without the shunt resistor connected, connect a power supply between the positive and negative terminals. Apply a range of voltages across the positive and negative terminals between -20 mV to 20 mV. Measure the voltage between VREF and IN+. The voltage should be 1 V for each 10 mV across the positive and negative terminals . For example, (i.e. -2 V with -20 mV, 0 V with 0 V, and 2 V with 20 mV).

isoSPI Enable

...

  • Turn the power supply off.

isoSPI

...

  • Connect the current sense board to a validated BMS carrier board.
  • Connect an oscilloscope probe between ISO GND, and the IBIAS pin of the LTC6820 (pin 16) of the a logic analyzer to the SPI testpoints and ISO GND of the current sense board.
  • Power the BMS carrier board with 12 V.
  • Toggle Set the CS pin of the current sense SPI.
  • If 2 V is measured on the oscilloscope, then the LTC6820 is enabled.

Option 2

  • Connect two GPIO pins of a microcontroller to the IP and IN testpoints or transformer pins.
  • Connect an oscilloscope probe between ISO GND, and the IBIAS pin of the LTC6820 (pin 16).
  • Power the current sense board by supplying 12 V between 12 V and GND.
  • Set IN high, IP high, IN low, and then IP low.
  • If 2 V is measured on the oscilloscope, then the LTC6820 is enabled.

ADC

  • BMS carrier board low, set the MOSI pin low, set the MOSI pin high, set the CS pin high. The same signals should be seen by the logic analyzer.
  • Turn the power supply off.

ADC

  • Connect the current sense board to a validated BMS carrier board using the isoSPI connections.
  • Power the BMS carrier board with 12 V.
  • Send the opcodes to read from the CONFIG0 registers (0010 0000, 0000 0001).
  • If 1 0 ID1 ID0 0 1 0 1 is returned, then the ADC is operating correctly, where ID1, and ID0 are factory programmed identification bits.

Option 2

  • Remove the LTC6820 from the current sense board.
  • Connect a SPI device to the SPI testpoints on the left side of the board.
  • Power the board by supplying 3.3 V between 5V and ISO GND.
  • Send the opcodes to read from the CONFIG0 registers (0010 0000, 0000 0001).
  • If 1 0 ID1 ID0 0 1 0 1 is returned, then the ADC is operating correctly, where ID1, and ID0 are factory programmed identification bitsTurn the power supply off.