MAX11331 datasheet(22/37 Pages) MAXIM

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�� Maxim Integrated Products 22

MAX11329–MAX11332

3Msps, 12-/10-Bit, 8-/16-Channel ADCs with

Post-Mux External Signal Conditioning Access

Table 2. ADC Mode Control Register (continued)

Table 3. ADC Scan Control

BIT NAME

BIT

DEFAULT

STATE

FUNCTION

PM[1:0]

4:3

Power Management Modes (Table 5). In external clock mode, PM[1:0] selects

between normal mode and various power-down modes of operation.

CHAN_ID

External Clock Mode. Channel address is always present in internal clock mode.

Set to 1, DOUT is a 16-bit data word containing a 4-bit channel address, followed by

a 12-bit conversion result led by the MSB.

SWCNV

Set to 1 to initiate conversions with the rising edge of CS instead of cycling CNVST

(internal clock mode only).

This bit is used for the internal clock mode only and must be reasserted in the ADC

mode control, if another conversion is desired.

—

Unused

SCAN3

SCAN2

SCAN1

SCAN0

MODE NAME

FUNCTION

Null

Continue to operate in the previously selected mode. Ignore data

on bits [10:0]. This feature is provided so that DIN can be held low

when no changes are required in the ADC Mode Control register.

Bits [6:3, 1] can be still written without changing the scan mode

properties.

Manual

The next channel to be selected is identified in each SPI frame. The

conversion results are sent out in the next frame.

Clock mode: External clock only

Channel scan/sequence: Single channel per frame

Channel selection: See Table 4, CHSEL[3:0]

Averaging: No

Repeat

Scans channel N repeatedly. The FIFO stores 4, 8, 12, or 16

conversion results for channel N.

Clock mode: Internal clock only

Channel scan/sequence: Single channel per frame

Channel selection: See Table 4, CHSEL[3:0]

Averaging: Can be enabled

Standard_Int

Scans channels 0 through N. The FIFO stores N conversion results.

Clock mode: Internal clock

Channel scan/sequence: N channels in ascending order

Channel selection: See Table 4, CHSEL[3:0] determines channel N

Averaging: Can be enabled

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