ADS8028

SBAS549B – MAY 2011 – REVISED MARCH 2012

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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

TSENSE

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

TSENSE: 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

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