ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012
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CONFIG3: Configuration Register 3
Address = 03h
BIT 7
BIT 6
1
BIT 5
1
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PD_REFBUF
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]
Bit 4
Must always be set to '1'
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 (VREF
)
Bit 3
Bit 2
Bit 1
Bit 0
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
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
BIAS_LOFF_SENS: BIAS sense function
This bit enables the BIAS sense function.
0 = BIAS sense is disabled (default)
1 = BIAS sense is enabled
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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