Texas Instruments TLV1562 manual DSP Algorithm for Mono Continuous Mode, SLAA040

Conversation Between the TLV1562 and the DSP

7.5Mono Continuous Mode

This mode simplifies data acquisition, since there is no need to generate a signal to sample or convert data. Instead, initializing this mode once, the ADC sends out the data continuously and will be read by the DSP with the RD signal.

CAUTION:

In this mode, the sampling result sent out by the ADC is the value of the sample from the last cycle. Therefore, the first sample after initialization is trash.

Table 10. DSP Algorithm for Mono Continuous Mode

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

STEPS

TIMING, NOTES

APD=0

APD=0

APD=1

APD=1

ADCSYCLK

ADCSYCLK

ADCSYCLK

ADCSYCLK

= 7.5 MHz

= 10 MHz

= 10 MHz

= 10 MHz

0.

Initialization

N/A

N/A

Write all configuration data to the

Activate the mono continuous mode in

N/A

N/A

ADC

CR0(2;3)

1.

Set

Deselect ADC

N/A

N/A

CS

2.

wait for t(SAMPLE1)

t(SAMPLE1) = 100 ns

≥

4

≥

4

N/A

N/A

3.

Clear

Select ADC

N/A

N/A

CS

4.

Clear

Start conversion

N/A

N/A

RD

5.

Wait the time tEN(DATAOUT)

tEN(DATAOUT) = 41 ns

≥

2

≥

2

N/A

N/A

6.

Read sample out from the data port;

(Caution: the first result after initialization

N/A

N/A

reset

signal

is trash)

RD

7.

Wait for the time t(CONV1) minus

t(CONV1) = 5(6) ADCSYSCLK; since step

≥ 23

≥ 16

N/A

N/A

step 7 and 8 to ensure 5(6) ADC-

7 and 8 take at least 4 DSPSYSCLK, the

SYSCLk

calculation are 5(6) ADCSYSCLK minus

100 ns

8.

Go to step 4 for more samples

N/A

N/A

16SLAA040