5.1 Static Behavior

Some compliance tests require a static state of the Device Under Test (DUT). This means the system must be in a fixed state for a longer time. This could be either the TX, the RX or the IDLEMode. Usually, such static states are not required for the normal application. Therefore, it is suitable to have special procedures in place. Microchip ATA UHF products offer a feature called “Operation Mode after System Start”. This option can be set in the EEPROM configuration (not applicable for the ATA5785). The setting allows the user to set a fixed Operation Mode (OPM) on specific Service/Channel configuration. After a wake up from OFFMode or the next Reset, the system behaves in that predefined mode. The following options can be configured:
  • Operation Mode (RX, TX, IDLE, POLLING)
  • Service (1, 2, 3, …)
  • Channel (1, 2, 3)
  • Path (A, B)
  • Calibration and Clock Source
  • Transparent or Buffered
  • Used Antenna (Only in ATA5835 and ATA5787)

The same configuration can be done either via SPI from the connected main microcontroller or triggered from a user Flash software (if available). These two options require special test sequences in the application code or require a special compliance test software. For example, to get a static TX signal, set OPM TXMode in transparent on the required service channel, then perform a Reset of the system.

The following sections provide more examples on test output signals.