Rainbow-electronics MAX1402 Manual de usuario descargar pdf (Pagina 22)

MAX1402

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

22 ______________________________________________________________________________________

DIFF

0 0 10

0 1

0 1 20

1 1

0 X 11

0 X

0 X 21

1 0

1 0 2

SCAN

1 1

TRANSFER

FUNCTION REG.

1 X

0 X

0 X 31

0 X

1 X 11

CALGAIN+ – CALGAIN-

AIN2–AIN6

AIN4–AIN6

AIN3–AIN6

Do Not Use

CALGAIN+ – CALGAIN-

CHANNEL

CALGAIN+ – CALGAIN-

CALOFF+ – CALOFF-

AIN1–AIN2

CALGAIN+ – CALGAIN-

AIN5–AIN6

1 X

1 X 31

1 X

AIN5–AIN6

CALGAIN+ – CALGAIN-

CALOFF+ – CALOFF-

AIN3–AIN4

0 X 11 X AIN1–AIN6

1 11 1 Do Not Use

Table 10. Transfer-Function Register Mapping—Gain-Cal Mode (M1 = 1, M0 = 0)

Data Register (Read-Only)

The data register is a 24-bit, read-only register. Any

attempt to write data to this location will have no effect.

If a write operation is attempted, 8 bits of data must be

clocked into the part before it will return to its normal

idle mode, expecting a write to the communications

Data is output MSB first, followed by one reserved 0 bit,

two auxiliary data bits, and a 3-bit channel ID tag indi-

cating the channel from which the data originated.

D17–D0: The conversion result. D17 is the MSB. The

result is in offset binary format. 00 0000 0000 0000

0000 represents the minimum value and 11 1111 1111

1111 1111 represents the maximum value. Inputs

exceeding the available input range are limited to the

corresponding minimum or maximum output values.

0: This reserved bit will always be 0.

X = Don’t care

AUXILIARY DATA CHANNEL ID TAG

DS0

D0 ‘0’

DS1 CID0

DATA BITS

CID2

CID1

RESERVED

(Data LSB) (LSB)

D9 D5D8 D7 D6 D2

DATA BITS

D4 D3

D17 D13D16 D15 D14 D10

DATA BITS

D12 D11

First Bit (Data MSB)

Data Register (Read-Only) Bits

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 39 40

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