ADC 400F Especificaciones descargar pdf (Pagina 6)

Figure 2 shows the timing for the method which uses 16 clock cycles for each conversion and data transfer cycle and

which inserts CS between each of these transfer cycles. Figure 3 shows the timing for the method which uses 16 clock

cycles for each conversion and data transfer cycle but inserts CS only once at the start of each sequence of conversions.

This application report describes various microcontroller interfaces, each of which uses 16 clock cycles for each

conversion data transfer. CS

is applied at the start of each conversion and data transfer. This method allows for the

general case where one or more conversions may be required. It also simplifies the required software.

Previous Conversion Data

MSB LSB

B7 B6 B5 B4

B15A15 A14 A13 A12 A11 A10 A9 A8 A1 A0

1 2 3 4 5 6 7 8 15 16 1

I/O

CLOCK

DATA

OUT

DATA

INPUT

EOC

B3 B2 B1 B0

conv

<10 µs

>1.425 µs

16-Clock Transfer Using CS

(MSB First)

Figure 2. Timing for 16-Clock Transfer Using CS With MSB First

Previous Conversion Data

MSB LSB

B7 B6 B5 B4 C7

B15A15 A14 A13 A12 A11 A10 A9 A8 A1 A0

1 2 3 4 5 6 7 8 15 16 1

DATA

OUT

DATA

INPUT

EOC

B3 B2 B1 B0

conv

<10 µs

>1.425 µs

16-Clock Transfer Not Using CS

(MSB First)

(EOC-DATA)

<10 µs

I/O

CLOCK

Figure 3. Timing for 16-Clock Transfer Not Using CS With MSB First

Minimum Number of Data Transfers per Channel

It should be noted that in any single data transfer cycle between the TLC2543 and the chosen microcontroller the data

output from the ADC is the result of the previous conversion. The software listings included in this application report

have been written for the general case where the conversion results may be required for any individual channel or

sequence of channels. In this case the program included for each microcontroller interface must be run at least twice per

channel so that valid data corresponding to the required analogue input channel and ADC mode is delivered.

Software can be written to implement the consecutive channel scanning mode of operation of the TLC2543. In this case

the result from the first analog-to-digital conversion should be ignored or overwritten.

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