DAC8728_14 Datasheet, PDF (46/56 Pages) Texas Instruments – Octal, 16-Bit, Low-Power, High-Voltage Output, Parallel Input DIGITAL-TO-ANALOG CONVERTER

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 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
GPIO
X ⁽¹⁾
X
X
X
X
X
X
X
X
X
X
X
X
X
X
(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
register. When the channel is accessed and the correction engine is enabled, the respective BF-x bit is set if
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 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BF-7 BF-6 BF-5 BF-4 BF-3 BF-2 BF-1 BF-0 X⁽¹⁾
X
X
X
X
X
X
X
(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.
46
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