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LTC1292DC Datasheet(PDF) 9 Page - Linear Technology |
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LTC1292DC Datasheet(HTML) 9 Page - Linear Technology |
9 / 24 page 9 LTC1292/LTC1297 LTC1292 Operating Sequence S APPLICATI I FOR ATIO Motorola SPI (MC68HC11) The MC68HC11 has been chosen as an example of an MPU with a dedicated serial port. This MPU transfers data MSB first and in 8-bit increments. A dummy DIN word sent to the data register starts the SPI process. With two 8-bit transfers, the A/D result is read into the MPU (Figure 1). For the LTC1292 the first 8-bit transfer clocks B11 through B8 of the A/D conversion result into the processor. The second 8-bit transfer clocks the remaining bits B7 through B0 into Microprocessor Interfaces The LTC1292/LTC1297 can interface directly (without external hardware) to most popular microprocessors’ (MPU) synchronous serial formats (see Table 1). If an MPU without a dedicated serial port is used, then three of the MPU’s parallel port lines can be programmed to form the serial link to the LTC1292/LTC1297. Included here are one serial interface example and one example showing a parallel port programmed to form the serial interface. Figure 1. Data Exchange Between LTC1292 and MC68HC11 CLK tCYC CS B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 tCONV DOUT Hi-Z tSMPL tSMPL LTC1292/7 AI01 LTC1297 Operating Sequence CLK CS DOUT MPU RECEIVED WORD LTC1292/7 F01 B7 B6 B5 B4 B3 B2 B1 B0 B1 B8 B9 B10 B11 BYTE 2 B10 B9 B8 B11 O ? ? ? 1ST TRANSFER 2ND TRANSFER BYTE 1 B2 B1 B0 B3 B4 B6 B7 B5 CLK tCYC CS B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 tCONV DOUT Hi-Z tSMPL LTC1292/7 AI02 tsuCS POWER SHUTDOWN MODE |
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