Texas Instruments TLV1562 - Manual (Page 19)

Conversation Between the TLV1562 and the DSP
13 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
Table 7. DSP Algorithm for Mono Interrupt Driven Mode Using RD
Wait cycles for the DSP internally (40 MHz DSPCLK):
STEPS TIMING, NOTES
APD=0
ADCSYCLK
= 7.5 MHz
APD=0
ADCSYCLK
= 10 MHz
APD=1
ADCSYCLK
= 10 MHz
APD=1
ADCSYCLK
= 10 MHz
0. Initialization
Write all configuration data to the
ADC activate the mono interrupt-driven mode
in CR0(2;3)
1. set CS deselect ADC (optional with APD=0)
2. clear CS Select ADC
(Note: if Hardware Auto power down is
enabled, Chip select has to be used,
otherwise CS can be left high)
3. Wait for
t
D(CSL-sample)
+1ADCSYSCLK
t
D(CSL-sample)
= 5ns (APD=0)
t
D(CSL-sample)
= 500ns (APD=1)
≥ 6 ≥ 5 ≥ 26 ≥ 25
4. Clear RD ADC goes over from sampling into
conversion
5. Wait until INT goes low alternative: ignore the INT signal, wait 49
ns+5(6) ADCSYSCLK and goto step
number 7
≥
34
≥
22
≥
34
≥
22
6. Wait the time t
EN(DATAOUT)
t
EN(DATAOUT)
= 41 ns
≥
2
≥
2
≥
2
≥
2
7. Read sample out from the data port;
Reset RD signal
8. Goto step 1 or step 3 (if APD=0) for
more samples