Texas Instruments TLV1562 manual Dual Interrupt Driven Mode

Conversation Between the TLV1562 and the DSP

7.4Dual Interrupt Driven Mode

Using techniques similar to those described in the first two modes for sampling/converting/sending tasks, the dual mode samples two channels at the same time and sends out the results in series to the data port. The CSTART pin is used to start sampling and converting.

Table 9. DSP Algorithm for Dual Interrupt Driven Mode

Wait cycles for the DSP internally (40MHz DSPCLK):

STEPS

TIMING, NOTES

APD=0

APD=0

APD=1

APD=1

ADCSYCLK

ADCSYCLK

ADCSYCLK

ADCSYCLK

= 7.5MHz

= 10MHz

= 10MHz

= 10MHz

1.

Set

Deselect ADC

CS

2.

Clear

This starts sampling

CSTART

3.

Wait for tW(CSTARTL)

tW(CSTARTL) = 100ns (APD=0)

≥ 4

≥ 4

≥ 24

≥ 24

tW(CSTARTL) = 600ns (APD=1)

4.

Set

This starts the conversion

CSTART

5.

Wait until

goes low

Alternative: ignore the

signal,

≥ 62

≥ 48

≥ 62

≥ 48

INT

INT

wait 210ns+10 ADCSYSCLK and go

to step number 7

6.

Wait the time tD(INTL-CSL)

tD(INTL-CSI) = 10 ns

≥ 1

≥ 1

≥ 1

≥ 1

7.

Clear

Select the ADC

CS

8.

Clear

Start communication

RD

9.

Wait the time tEN(DATAOUT)

tEN(DATAOUT) = 41 ns

≥ 2

≥ 2

≥ 2

≥ 2

10.Read sample out from the data port; reset RD signal

11.	Wait tW(CSH)	tW(CSH) = 50 ns	≥ 2	≥ 2	≥ 2	≥ 2
12.	Clear RD-	Start communication
13.	Wait the time tEN(DATAOUT)	tEN(DATAOUT) = 41 ns	≥ 2	≥ 2	≥ 2	≥ 2

14.Read sample out from the data port; reset RD signal

15. Set CS Deselect ADC

16.Goto step 2 for the next samples

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 15