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Summary of Contents for HOLT HI-15691
- Page 1 ADK-15691 Quick Start Guide – HI-15691 Transceiver Demonstration Board February 7, 2022 QSG-15691 Rev. New Holt Integrated Circuits...
- Page 2 QSG-15691 REVISION HISTORY Revision Date Description of Change QSG-15691 Rev. New 02/7/2022 Initial Release QSG-15691 Rev. New Holt Integrated Circuits...
- Page 3 To demonstrate the board, use the provided external power adapter providing 7.5 or 9.0 VDC at 1A. Connect 3.3V or 5V to TP5 or J1 Pin21 or 23 to enable U2 5V regulator that powers the HI-15691. This controlling voltage on TP5 can be used to sequence power on the HI-15691 by a host controller. JP11 is shorted so the 5 volts from the voltage regulator is connected to the HI-15691.
- Page 4 The board uses an external 7.5 or 9.0 VDC 1A power adapter. A MOSFET senses the presence of 3V3 on J1 and turns on power to the 5V voltage regulator to power the HI-15691. This allows the 5V to be time sequence when the 3V3 is present so everything powers up at the same time as a FPGA or host controller.
- Page 5 This effect is discussed at length in Holt application note AN-550. When the host applies TX and nTX signals the HI-15691 will transmit to the 1553 bus as shown below providing the Transmit Inhibit pins are low. See AN-550 for tail-off considerations and if using a FPGA to generate the TX and nTX signals, experience has demonstrated performance is optimized with higher drive levels.
- Page 6 QSG-15691 Flexible 1553 Bus Interface Configuration The HI-15691 Signal Break-Out Board has several options for configuring both MIL-STD-1553 bus interfaces. The options are listed here and fully described below: • Direct-Coupled or Transformer-Coupled bus interface for normal 1553 connectivity. Do not use on-board termination resistors R5 and R6 (JP4 and JP9 must be open) in normal mode.
- Page 7 QSG-15691 The HI-15691 Signal Break-Out Board (and user-provided protocol logic) takes the place of the BC or one of the RTs in the above diagram. As seen above, each terminal’s stub cable connects to the 1553 bus through a “bus coupler,” which is typically an off-the-shelf hardware component comprised of coupling transformer(s) for one or more terminal stubs (each with its own pair of internal current-limiting resistors).
- Page 8 QSG-15691 to be used when evaluating HI-15691 transceiver performance; the minus side of the 1553 bus stub would never be left grounded under normal circumstances for production hardware. The above comments for configuring Bus A also apply for Bus B, substituting test points BUSB and nBUSB for test points BUSA and nBUSA respectively.
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