Rainbow-electronics MAX1204 Manual do Utilizador descarregar pdf (Página 11)

MAX1204

5V, 8-Channel, Serial, 10-Bit ADC

with 3V Digital Interface

______________________________________________________________________________________ 11

Table 2. Control-Byte Format

Table 3. Channel Selection in Single-Ended Mode (SGL/DIF = 1)

SEL1 SEL0

0 0 0

CH4 CH5SEL2 CH6 CH7 GND

–

1 0 0 –+

0 0 1 –+

1 0

CH0

1 –+

0 1

CH1

0 + –

1 1

CH3

0 + –

0 1

CH2

1 + –

1 1 1 + –

Table 4. Channel Selection in Differential Mode (SGL/DIF = 0)

SEL1 SEL0

0 0 0

CH4 CH5SEL2 CH6 CH7

0 0 1 –+

0 1 0 + –

0 1

CH0

1 + –

1 0

CH1

–

0 – +

1 0

CH3

1 +–

1 1

CH2

0 – +

1 1 1 – +

PD0

Bit 0

(LSB)

SGL/DIF

Bit 2

PD1

Bit 1

UNI/BIP

Bit 3

SEL 0

Bit 4

Bit 7

(MSB)

SEL 1SEL 2START

Bit 5Bit 6

1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, an

analog input signal from 0V to V

REF

can be converted; in bipolar mode, the signal can range

from -V

REF

/ 2 to +V

REF

/ 2.

1 = single ended, 0 = differential. Selects single-ended or differential conversions. In single-

ended mode, input signal voltages are referred to GND. In differential mode, the voltage dif-

ference between two channels is measured. (Tables 3 and 4.)

Selects clock and power-down modes.

PD1 PD0 Mode

00 Full power-down (I

= 2µA, internal reference)

01 Fast power-down (I

= 30µA, internal reference)

10 Internal clock mode

11 External clock mode

These three bits select which of the eight channels is used for the conversion

(Tables 3 and 4).

The first logic 1 bit after CS goes low defines the beginning of the control byte.

DescriptionNameBit

UNI/BIP

SGL/DIF

PD1

PD0

0 (LSB)

SEL2

SEL1

SEL0

START7 (MSB)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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