Datasheet

ADS8028
SBAS549B –MAY 2011–REVISED MARCH 2012 www.ti.com
DATA WRITE OPERATION
Control Register Settings
The ADS8028 operation is controlled by the status of the internal Control Register. Data written into the Control
Register decide the configuration of the ADS8028 for the next conversion cycle. The Control Register is 16 bits
wide, and only supports write operation. The Control Register can be written to with the serial interface. Data on
the DIN pin are loaded into the Control Register on the first 16 SCLK falling edges (after a CS falling edge). The
bit functions are outlined in Table 2. On power-up, the default Control Register content is all '0's.
Table 2. Control Register Bit Functions
MSB
15 14 13 12 11 10 9 8
WRITE REPEAT AIN0 AIN1 AIN2 AIN3 AIN4 AIN5
LSB
7 6 5 4 3 2 1 0
AIN6 AIN7 T
SENSE
X X EXT_REF TMP_AVG STANDBY
Bit 15 WRITE: Write to Control Register
Enable write operation.
0 = Write disabled; Control Register is not updated and the next 15 bits are ignored (default)
1 = Write enabled; the next 15 bits update the Control Register
Bit 14 REPEAT: Repeat conversion mode
Enable conversion repeat mode (refer to the Modes of Operation section).
0 = Disable repeat conversion mode (default)
1 = Enable repeat conversion mode
Bits[13:6] AIN[0:7]: Analog input channel selection
Each AINx bit corresponds to the associated analog input channel, AIN0 to AIN7.
0 = AINx channel is not selected for conversion (default)
1 = AINx channel is selected for conversion
Bit 5 T
SENSE
: Internal temperature sensor selection
Internal temperature sensor selection for conversion in subsequent cycles.
0 = Internal temperature sensor output is not selected for conversion (default)
1 = Internal temperature sensor output is selected for conversion
Bits[4:3] X: Don’t care
Bit 2 EXT_REF: Reference source selection
This bit selects the reference source for the next conversion.
0 = Internal reference is used for the next conversion (default)
1 = External reference is used for the next conversion
Bit 1 TMP_AVG: Temperature sensor averaging selection
This bit selects the mode of operation for the temperature sensor channel; this bit is ignored
if bit 5 is set to '0'.
0 = Averaging is disabled on the temperature sensor result (default)
1 = Averaging is enabled on the temperature sensor result
Bit 0 STANDBY: STANDBY mode selection
This bit sets the mode (normal or standby) for the ADS8028.
0 = The ADS8028 operates in normal mode (default)
1 = The ADS8028 goes to standby mode in the next cycle
18 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): ADS8028