TLC32046MFKB datasheet(22/56 Pages) TI

22 / 56 page

2–8

2.15 Communications Word Sequence

In the dual-word (telephone interface) mode, there are two data words that are presented to the DSP or

µP

from the DR terminal. The first data word is the ADC conversion result occurring during the FSR time, and

the second is the serial data applied to DATA-DR during the FSD time. FSR is not asserted during secondary

communications and FSD is not asserted during primary communications.

DX-14 Bits Digital 11

From DSP to DAC

4 Shift

Clocks

DX-14 Bits Digital XX

From DSP

Input for D/A

Conversion

Input for Register

Program

2s Complement Output

From ADC to the DSP

2s Complement Output

From ADC to the DSP

Data From DATA-DR

to the DSP

16 bits

Primary

Communications

Secondary

Communications

FSX

FSR

TLC32046

Dual-Word

(telephone interface)

Mode Only

TLC32046

Dual-Word

(telephone interface)

Mode Only

16 bits Digital From

DATA-DR to DR

FSD

TLC32046

Dual-Word

(telephone interface)

Mode Only

Figure 2–2. Primary and Secondary Communications Word Sequence

2.15.1

DR Word Bit Pattern

The data word is the 14-bit conversion result of the receive channel to the processor in 2s complement

format. With 16-bit processors, the data is 16 bits long with the two LSBs at zero.

A/D MSB

1st bit sent

A/D LSB

↓

D15

D14

D13

D12

D11

D10

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