Datasheet

ADS1291

ADS1292

ADS1292R

www.ti.com

SBAS502B –DECEMBER 2011–REVISED SEPTEMBER 2012

RESP2: Respiration Control Register 2

Address = 0Ah

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

CALIB_ON 0 0 0 0 RESP_FREQ RLDREF_INT 1

This register controls the respiration and calibration functionality.

Bit 7 CALIB_ON: Calibration on

This bit is used to enable offset calibration.

0 = Off (default)

1 = On

Bits[6:3] Must be '0'

Bit 2 RESP_FREQ: Respiration control frequency (ADS1292R only)

This bit controls the respiration control frequency when RESP_CTRL = 0. This bit must be written with '1' for the ADS1291

and ADS1292.

0 = 32 kHz (default)

1 = 64 kHz

Bit 1 RLDREF_INT: RLDREF signal

This bit determines the RLDREF signal source.

0 = RLDREF signal fed externally

1 = RLDREF signal (AVDD – AVSS) / 2 generated internally (default)

Bit 0 Must be set to '1'

GPIO: General-Purpose I/O Register

Address = 0Bh

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

0 0 0 0 GPIOC2 GPIOC1 GPIOD2 GPIOD1

This register controls the GPIO pins.

Bits[7:4] Must be '0'

Bits[3:2] GPIOC[2:1]: GPIO 1 and 2 control

These bits determine if the corresponding GPIOD pin is an input or output.

0 = Output

1 = Input (default)

Bits[1:0] GPIOD[2:1]: GPIO 1 and 2 data

These bits are used to read and write data to the GPIO ports.

When reading the register, the data returned correspond to the state of the GPIO external pins, whether they are

programmed as inputs or as outputs. As outputs, a write to the GPIOD sets the output value. As inputs, a write to the

GPIOD has no effect. GPIO is not available in certain respiration modes.

Product Folder Links: ADS1291 ADS1292 ADS1292R