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ADS1292IPBS Datasheet(PDF) 34 Page - Texas Instruments |
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ADS1292IPBS Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 69 page  ADS1291 ADS1292 ADS1292R SBAS502A – DECEMBER 2011 – REVISED MARCH 2012 www.ti.com SPI COMMAND DEFINITIONS The ADS1291, ADS1292, and ADS1292R provide flexible configuration control. The opcode commands summarized in Table 13 control and configure the ADS1291, ADS1292, and ADS1292R operation. The opcode commands are stand-alone, except for the register read and register write operations that require a second command byte plus data. CS can be taken high or held low between opcode commands but must stay low for the entire command operation (especially for multi-byte commands). System opcode commands and the RDATA command are decoded by the ADS1291, ADS1292, and ADS1292R on the seventh SCLK falling edge. The register read and write opcodes are decoded on the eighth SCLK falling edge. Be sure to follow SPI timing requirements when pulling CS high after issuing a command. Table 13. Command Definitions COMMAND DESCRIPTION FIRST BYTE SECOND BYTE System Commands WAKEUP Wake-up from standby mode 0000 0010 (02h) STANDBY Enter standby mode 0000 0100 (04h) RESET Reset the device 0000 0110 (06h) START Start or restart (synchronize) conversions 0000 1000 (08h) STOP Stop conversion 0000 1010 (0Ah) OFFSETCAL Channel offset calibration 0001 1010 (1Ah) Data Read Commands Enable Read Data Continuous mode. RDATAC 0001 0000 (10h) This mode is the default mode at power-up.(1) SDATAC Stop Read Data Continuously mode 0001 0001 (11h) RDATA Read data by command; supports multiple read back. 0001 0010 (12h) Register Read Commands RREG Read n nnnn registers starting at address r rrrr 001r rrrr (2xh)(2) 000n nnnn(2) WREG Write n nnnn registers starting at address r rrrr 010r rrrr (4xh)(2) 000n nnnn(2) (1) When in RDATAC mode, the RREG command is ignored. (2) n nnnn = number of registers to be read or written – 1. For example, to read or write three registers, set n nnnn = 0 (0010). r rrrr = starting register address for read and write opcodes. WAKEUP: Exit STANDBY Mode This opcode exits the low-power standby mode; see the STANDBY: Enter STANDBY Mode subsection of the SPI Command Definitions section. Time is required when exiting standby mode (see the Electrical Characteristics for details). There are no restrictions on the SCLK rate for this command and it can be issued any time. Any following command must be sent after 4 tCLK cycles. STANDBY: Enter STANDBY Mode This opcode command enters the low-power standby mode. All parts of the circuit are shut down except for the reference section. The standby mode power consumption is specified in the Electrical Characteristics. There are no restrictions on the SCLK rate for this command and it can be issued any time. Do not send any other command other than the wakeup command after the device enters the standby mode. RESET: Reset Registers to Default Values This command resets the digital filter cycle and returns all register settings to the default values. See the Reset (RESET) subsection of the SPI Interface section for more details. There are no restrictions on the SCLK rate for this command and it can be issued any time. It takes 9 fMOD cycles to execute the RESET command. Avoid sending any commands during this time. 34 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Product Folder Link(s): ADS1291 ADS1292 ADS1292R |
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