DAC8728 datasheet(46/52 Pages) TI

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DAC8728

SBAS466A – JUNE 2009 – REVISED NOVEMBER 2009

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GPIO Register. Default = 8000h.

The GPIO Register determines the status of the GPIO pin.

D15

D14

D13

D12

D11

D10

GPIO

X(1)

(1)

X = don't care. Writing to this bit has no effect; reading the bit returns '0'.

GPIO

For write operations, the GPIO pin operates as an output. Writing a '1' to the GPIO bit sets the GPIO pin to high

impedance, and writing a '0' sets the GPIO pin to logic low. An external pull-up resistor is required when using

the GPIO pin as an output.

For read operations, the GPIO pin operates as an input. Read the GPIO bit to receive the status of the GPIO

pin. Reading a '0' indicates that the GPIO pin is low, and reading a '1' indicates that the GPIO pin is high.

After power-on reset, or any forced hardware or software reset, the GPIO bit is set to '1', and is in a

high-impedance state.

Busy Flag Register (read-only). Default = 0000h.

Busy flag bit of DAC-x. The Busy Flag Register Each channel has an individual busy flag (BF-x) in the Busy Flag

either the Input Data Register, Zero Register, or Gain Register are written to. When the DAC data is adjusted by

the correction engine and transferred into the DAC Data Register, the BF-x bit is cleared. It takes approximately

500ns per channel for the correction to complete.

D15

D14

D13

D12

D11

D10

BF-7

BF-6

BF-5

BF-4

BF-3

BF-2

BF-1

BF-0

X(1)

(1)

X = don't care. Writing to this bit has no effect; reading the bit returns '0'.

BF-7:0

BF-x = '1' if the input data of DAC-x has not been corrected or if the correction engine is not finished.

BF-x = '0' when the input data has been corrected or the correction engine is turned off.

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