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AD7731 Datasheet(PDF) 12 Page - Analog Devices |
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AD7731 Datasheet(HTML) 12 Page - Analog Devices |
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12 / 44 page  AD7731 –12– REV. 0 Table V. Summary of On-Chip Registers Power-On/Reset Register Name Type Size Default Value Function Communications Write Only 8 Bits Not Applicable All operations to other registers are initiated through Register the Communications Register. This controls whether subsequent operations are read or write operations and also selects the register for that subsequent opera- tion. Most subsequent operations return control to the Communications Register except for the continu- ous read mode of operation. Status Register Read Only 8 Bits CX Hex Provides status information on conversions, calibra- tions, settling to step inputs, standby operation and the validity of the reference voltage. Data Register Read Only 16 Bits or 24 Bits 000000 Hex Provides the most up-to-date conversion result from the part. Register length can be programmed to be 16 bit or 24 bit. Mode Register Read/Write 16 Bits 0174 Hex Controls functions such as mode of operation, uni- polar/bipolar operation, controlling the function of AIN3/D1 and AIN4/D0, burnout current and Data Register word length. It also contains the reference selection bit, the range selection bits and the channel selection bits. Filter Register Read/Write 16 Bits 2002 Hex Controls the amount of averaging in the first stage filter, selects the fast step and skip modes and con- trols the chopping modes on the part. Offset Register Read/Write 24 Bits Contains a 24-bit word which is the offset calibration coefficient for the part. The contents of this register are used to provide offset correction on the output from the digital filter. There are three Offset Regis- ters on the part and these are associated with input channel pairs as outlined in Table XIII. Gain Register Read/Write 24 Bits Contains a 24-bit word which is the gain calibration coefficient for the part. The contents of this register are used to provide gain correction on the output from the digital filter. There are three Gain Registers on the part and these are associated with input chan- nel pairs as outlined in Table XIII. Test Register Read/Write 24 Bits 000000 Hex Controls the test modes of the part which are used when testing the part. The user is advised not to change the contents of this register. N E W O R E Z1 W R0 W RO R E Z2 S R1 S R0 S R Y D RY D T S Y B T SF E R O N3 S M2 S M1 S M0 S M 2 D M1 D M0 D M B U / N E D1 D0 DL W F E R I H2 N R1 N R0 N RO B2 H C1 H C0 H C 1 1 F S0 1 F S9 F S8 F S7 F S6 F S5 F S4 F S 3 F S2 F S1 F S0 F SO R E ZP H CP I K ST S A F |
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