ADS1294 datasheet(55/88 Pages) TI

55 / 88 page

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

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SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

CONFIG4: Configuration Register 4

Address = 17h

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

RESP_FREQ2

RESP_FREQ1

RESP_FREQ0

SINGLE_SHOT

WCT_TO_RLD

PD_LOFF_COMP

Bits[7:5]

RESP_FREQ[2:0]: Respiration modulation frequency

These bits control the respiration control frequency when RESP_CTRL[1:0] = 10 or RESP_CTRL[1:0] = 10(1).

000 = 64kHz modulation clock

001 = 32kHz modulation clock

010 = 16kHz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

011 = 8kHz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

100 = 4kHz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

101 = 2kHz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

110 = 1kHz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

111 = 500Hz square wave on GPIO3 and GPIO04. Output on GPIO4 is 180 degree out of phase with GPIO3.

Modes 000 and 001 are modulation frequencies in internal and external respiration modes. In internal respiration mode, the

control signals appear at the RESP_MODP and RESP_MODN terminals. All other bit settings generate square waves as

described above on GPIO4 and GPIO3.

(1)

These frequencies assume fCLK = 2.048MHz.

Bit 4

Must always be set to '0'

Bit 3

SINGLE_SHOT: Single-shot conversion

This bit sets the conversion mode.

0 = Continuous conversion mode (default)

1 = Single-shot mode

Bit 2

WCT_TO_RLD: Connects the WCT to the RLD

This bit connects WCT to RLD.

0 = WCT to RLD connection off (default)

1 = WCT to RLD connection on

Bit 1

PD_LOFF_COMP: Lead-off comparator power-down

This bit powers down the lead-off comparators.

0 = Lead-off comparators disabled (default)

1 = Lead-off comparators enabled

Bit 0

Must always be set to '0'

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ADS1294 Datasheet(PDF) 55 Page - Texas Instruments

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