Datasheet

ADS1299

SBAS499A –JULY 2012–REVISED AUGUST 2012

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CONFIG3: Configuration Register 3

Address = 03h

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

PD_REFBUF 1 1 BIAS_MEAS BIASREF_INT PD_BIAS BIAS_LOFF_SENS BIAS_STAT

This register configures multi-reference and bias operations.

Bit 7 PD_REFBUF: Power-down reference buffer

This bit determines the power-down reference buffer state.

0 = Power-down internal reference buffer (default)

1 = Internal reference buffer enabled

Bits[6:5] Must always be set to '1'

Bit 4 BIAS_MEAS: BIAS measurement

This bit enables BIAS measurement. The BIAS signal may be measured with any channel.

0 = Open (default)

1 = BIASIN signal is routed to the channel that has the MUX_Setting 010 (V

REF

)

Bit 3 BIASREF_INT: BIASREF signal

This bit determines the BIASREF signal source.

0 = BIASREF signal fed externally (default)

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

Bit 2 PD_BIAS: BIAS buffer power

This bit determines the BIAS buffer power state.

0 = BIAS buffer is powered down (default)

1 = BIAS buffer is enabled

Bit 1 BIAS_LOFF_SENS: BIAS sense function

This bit enables the BIAS sense function.

0 = BIAS sense is disabled (default)

1 = BIAS sense is enabled

Bit 0 BIAS_STAT: BIAS lead-off status

This bit determines the BIAS status.

0 = BIAS is connected (default)

1 = BIAS is not connected

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