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ADS7142 Datasheet(PDF) 47 Page - Texas Instruments |
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ADS7142 Datasheet(HTML) 47 Page - Texas Instruments |
47 / 74 page 47 ADS7142 www.ti.com SBAS773A – SEPTEMBER 2017 – REVISED DECEMBER 2017 Product Folder Links: ADS7142 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.6.4 ANALOG MUX and SEQUENCER REGISTERS These registers configure the analog multiplexer and channel sequencing. 7.6.4.1 AUTO_SEQ_CHEN Register (address = 20h), [reset = 03h] This register selects the channels that are scanned when Auto-Sequencing is enabled. By default, both channels are selected at power up. Figure 81. AUTO_SEQ_CHEN Register 7 6 5 4 3 2 1 0 0 0 0 0 0 0 AUTOSEQ_EN _CH1 AUTOSEQ_EN _CH0 R-0b R-0b R-0b R-0b R-0b R-0b R/W-1b R/W-1b LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 12. AUTO_SEQ_CHEN Register Field Descriptions Bit Field Type Reset Description 7-2 RESERVED R 000000b Reserved Bits. Read returns 000000b 1 AUTO_SEQ_CH1 R/W 1b 0 = Channel 1 is not selected for auto sequencing 1= Channel 1 is selected for auto sequencing 0 AUTO_SEQ_CH0 R/W 1b 0 = Channel 0 is not selected for auto sequencing 1= Channel 0 is selected for auto sequencing 7.6.4.2 START_SEQUENCE Register (address = 1Eh), [reset = 00h] A write to this register starts the channel scanning sequence. Figure 82. START_SEQUENCE Register 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 SEQ_START R-0b R-0b R-0b R-0b R-0b R-0b R-0b W-0b LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 13. START_SEQUENCE Register Field Descriptions Bit Field Type Reset Description 7-1 RESERVED R 0000000b Reserved Bits. Read returns 0000000b 0 SEQ_START W 0b Setting this bit = 1 brings the BUSY/RDY pin high and starts the first conversion in the sequence |
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