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README-eet.rst

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LXA TAC External Electronic Testing Equipment

The eet is an external signal multiplexing device - initially designed for end-of-line tests of the LXA TAC. In these tests it is used to provide analog signals to the TAC's DUT-facing interfaces.

For this document we assume that you are using a lxatac-S10-R01-V01-C00.

Modifications

  • Use the I2C-to-USB control option.
  • Power the eet with 12V via the 12V-in barrel jack.
  • 12V-in soldered to AUX3.
  • 5V (from I2C-adapter) soldered to AUX 1
  • External short between Curr+ and Curr-.
  • Volt+ and Volt- can be open or connected to a high impedance volt-meter. But be aware that this port will be used to short BUS1 and BUS2 in some tests.

Connections between eet and LXA TAC

  • 3x USB-Host port to USB in.
  • At least one USB device (e.g. mass storage) connected to one of the USB out.
  • UART 3.3V and GND from LXA TAC and eet connected.
  • OUT0 and OUT1 connected.
  • IOBus connected with a 9-Pin D-Sub cable.
  • DUT Power connected.

Labgrid Setup

We are using a test-suite-local driver for the EET. Make sure to add an RemoteLxatacEETResource to your environment configuration:

RemoteLxatacEETResource:
  host: lxatac-00013
  usbpath: 1-1.2:1.0

usbpath can be obtained on the exporter where the eet is connected to. Watch out for /sys/bus/usb/drivers/i2c-tiny-usb/{usbpath}/.