TLC320AC01C datasheet(33/90 Pages) TI

33 / 90 page

2–19

2.18.1

Primary Serial Communications Data Format

D15

D14

D13

D12

D11

D10

D09

D08

D07

D06

D05

D04

D03

D02

D01

D00

14-bit DAC Conversion Result

2s-Complement Format†

Control Bits

† Since the supply voltage is single ended, the reference for 2s-complement format is ADC VMID. Voltagesabove

this reference have a 0 as the MSB, and voltages below this reference have a 1 as the MSB.

During primary serial communications, when D01 and D00 are both high in the DAC data word to DIN, a

subsequent 16 bits of control information is received by the device at DIN during a secondary

serial-communication interval. This secondary serial-communication interval begins at 1/2 the programmed

conversion time when the B register data value is even or 1/2 the programmed value minus one FCLK when

the B register data value is odd. The time between primary and secondary serial communication is

measured from the falling edge of the primary frame sync to the falling edge of the secondary frame sync

(see Section 2.19 for function and format of control words).

2.18.2

Data Format From DOUT During Primary Serial Communications

14-Bit ADC Conversion Result

2s-Complement Format

D15 is the Sign Bit

D15

D14

D13

D12

D11

D10

D09

D08

D07

D06

D05

D04

D03

D02

D01

D00

D01

+ 0

D00

+ 0

D01

+ 0

D00

+ 1

Master Mode

Slave Mode

2.19 Secondary Serial Communications

2.19.1

Data Format to DIN During Secondary Serial Communications

There are nine 16-bit configuration and control registers numbered from zero to eight. All register data

contents are represented in 2s-complement format. The general format of the commands during secondary

serial communications is as follows.

DS15 DS14 DS13 DS12 DS11 DS10 DS09 DS08 DS07 DS06 DS05 DS04 DS03 DS02 DS01 DS00

Control Bits

(2 bits)

R/W

Bit

(5 bits)

(8 bits)

All control register words are latched in the register and valid on the sixteenth falling edge of SCLK.

2.19.2

Control Data-Bit Function in Secondary Serial Communication

2.19.2.1 DS15 and DS14

In the secondary data word, bits DS15 and DS14 perform the same control function as the primary control

bits D01 and D00 do in the primary data word.

DS15 DS14 DS13 DS12

DS11 DS10 DS09 DS08 DS07 DS06 DS05 DS04 DS03 DS02 DS01 DS00

R/W

Control Bits

Hardware terminals FC1 and FC0 are valid inputs when DS15 and DS14 are both high, and they are ignored

for all other conditions.

TLC320AC01C Datasheet(PDF) 33 Page - Texas Instruments

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