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HI-8599PQT Datasheet(PDF) 6 Page - Holt Integrated Circuits |
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HI-8599PQT Datasheet(HTML) 6 Page - Holt Integrated Circuits |
6 / 12 page FUNCTIONAL DESCRIPTION (cont.) LINE DRIVER OPERATION The line driver in the HI-8599 is designed to directly drive the ARINC 429 bus. The two ARINC outputs (TXA(OUT) and TXB(OUT)) provide a differential voltage to produce a +10 volt One, a -10 volt Zero, and a 0 volt Null. Setting Control Register bit 13 to zero causes a slope of 1.5 s on the ARINC outputs. A one in Control Register bit 13 causes a slope of 10 s. Timing is set by on- chip resistor and capacitor and tested to be within ARINC require- ments. he HI-8599 has 10 ohms in series with each line driver output, and is for applications where additional external series resistance is required, such as lightning protection. m m No additional hardware is required to control the slope. T Repeater mode of operation allows a data word that has been received by the HI-8599 to be placed directly into its FIFO for transmission. Repeater operation is similar to normal receiver operation. In normal operation, either byte of a received data word may be read from the receiver latches first by use of SEL input. During repeater operation however, the lower byte of the data word must be read first. This is necessary because, as the data is being read, it is also being loaded into the FIFO and the transmitter FIFO is always loaded with the lower byte of the data word first. Signal flow for repeater operation is shown in the Timing Diagrams section. REPEATER OPERATION DATA RATE - EXAMPLE PATTERN TXA(OUT) ARINC BIT TXB(OUT) NULL DATA DATA DATA NULL NULL WORD GAP BIT 1 NEXT WORD BIT 32 BIT 31 BIT 30 LOADING CONTROL WORD CWHLD t CWSET t CWSTR t DATA BUS CWSTR VALID TIMING DIAGRAMS HI-8599 HI-8599-10 The “-10” version of the HI-8599 product require a 10 Kohm resistor to be placed in series with each ARINC input without affecting the ARINC input thresholds. This option is especially useful in applications where external lightning protection is required. Each ARINC input pin must be connected to the ARINC bus through a 10 Kohm resistor in order for the chip to properly detect the correct ARINC levels. The typical 10 volt differential signal is translated and input to a window comparator and latch. The comparator levels are set so that with the external 10 Kohm resistors, they are just below the standard 6.5 volt minimum ARINC data threshold and just above the 2.5 volt maximum ARINC null threshold. Please refer to the Holt AN-300 Application Note for additional information and recommendations on lightning protection of Holt line drivers and line receivers. POWER SUPPLY SEQUENCING The power supplies should be controlled to prevent large currents during supply turn-on and turn-off. The recommended sequence is V+ followed by Vcc, always ensuring that V+ is the most positive supply. The V- supply is not critical and can be asserted at any time. HOLT INTEGRATED CIRCUITS 6 |
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