Omega-engineering OME-A8111 Manuel d'utilisateur télécharger pdf (Page 17)

2.4.7 A/D Multiplex Control Register

(WRITE) Base+A : A/D Multiplexer Control Register Format

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

X X X X X D2 D1 D0

A/D input channel selection data =3 bits: D2...D0, D2=MSB, D0=LSB, X=don‘t care

Channel Bit_2 Bit_1 Bit_0

0 0 0 0

1 0 0 1

2 0 1 0

3 0 1 1

4 1 0 0

5 1 0 1

6 1 1 0

7 1 1 1

NOTE: The settling time of the multiplexer depends on the source resistance of input

sources.

Approx. Source resistance = 0.1 KΩ Î Approx. Settling time = 3 µs.

Approx. Source resistance = 1 KΩ Î Approx. Settling time = 5 µs.

Approx. Source resistance = 10 KΩ Î Approx. Settling time = 10 µs.

Approx. Source resistance = 100 KΩ Î Approx. Settling time = 100 µs.

Sec 2.4.6 gives information about settling time delay.

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Omega-engineering OME-A8111 Manuel d'utilisateur Page 17