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LTC2686 Datasheet(PDF) 22 Page - Analog Devices |
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LTC2686 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 45 page  Data Sheet LTC2686 THEORY OF OPERATION analog.com Rev. A | 22 of 45 SPI Command Table The LTC2686 supports the write and read commands summarized in Table 8 and Table 9. Commands are encoded with the first byte containing the command code. For commands that refer to a specific DAC channel, the chip interprets the last four bits of the command byte as the binary encoded DAC Channel Address A[3:0], see Table 10. The optional CRC error checking is available for all commands, except for the write/read configuration register (Command 7 and Command 24), and the write/read fault register (Command 13 and Command 30). For these commands, CRC error checking is skipped even if the CRC error checking feature is enabled. Table 8. Write Operation SPI Commands Command No. Write Operations Command Code Data CRC (Optional) 0 Write code to DAC Channel x 0000 A[3:0] Data CRC 1 Write channel settings to DAC Channel x 0001 A[3:0] Data CRC 2 Write offset adjust to DAC Channel x 0010 A[3:0] Data CRC 3 Write gain adjust to DAC Channel x 0011 A[3:0] Data CRC 4 Write code to and update DAC Channel x 0100 A[3:0] Data CRC 5 Write code to DAC Channel x, update all DAC channels 0101 A[3:0] Data CRC 6 Update DAC Channel x 0110 A[3:0] Don't care CRC 7 Write configuration register 0111 0000 Data Don't care 8 Write power-down register 0111 0001 Data CRC 9 Write A/B select register 0111 0010 Data CRC 10 Write software toggle bit register 0111 0011 Data CRC 11 Write toggle/dither enable register 0111 0100 Data CRC 12 Write mux control register 0111 0101 Data CRC 13 Write fault register 0111 0110 Data Don't care 14 Write code to all DAC channels 0111 1000 Data CRC 15 Write code and update all DAC channels 0111 1001 Data CRC 16 Write channel settings to all DAC channels 0111 1010 Data CRC 17 Write channel settings and update all DAC channels 0111 1011 Data CRC 18 Update all DAC channels 0111 1100 Don't care CRC Table 9. Read Operation SPI Commands Command No. Read Operations Command Code Data CRC (Optional) 20 Read offset and gain adjusted code of DAC Channel x 1000 A[3:0] Don't care CRC 21 Read channel settings of DAC Channel x 1001 A[3:0] Don't care CRC 22 Read offset adjust of DAC Channel x 1010 A[3:0] Don't care CRC 23 Read gain adjust of DAC Channel x 1011 A[3:0] Don't care CRC 24 Read configuration register 1111 0000 Don't care Don't care 25 Read power-down status 1111 0001 Don't care CRC 26 Read A/B select register 1111 0010 Don't care CRC 27 Read software toggle bit register 1111 0011 Don't care CRC 28 Read toggle/dither enable register 1111 0100 Don't care CRC 29 Read mux control register 1111 0101 Don't care CRC 30 Read fault register 1111 0110 Don't care Don't care 31 Read thermal shutdown status register 1111 0111 Don't care CRC 32 No operation 1111 1111 Don't care CRC |
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