ADS1291IPBSRG4 datasheet(53/83 Pages) TI2

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ADS1291, ADS1292, ADS1292R

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SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

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8.6.1.3 CONFIG2: Configuration Register 2 (address = 02h)

This register configures the test signal, clock, reference, and LOFF buffer.

Figure 58. CONFIG2: Configuration Register 2

PDB_LOFF_

COMP

PDB_REFBUF

VREF_4V

CLK_EN

INT_TEST

TEST_FREQ

Table 19. CONFIG2: Configuration Register 2 Field Descriptions

Bit 7

Must be set to '1'

Bit 6

PDB_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 5

PDB_REFBUF: Reference buffer power-down

This bit powers down the internal reference buffer so that the external reference can be used.

0 = Reference buffer is powered down (default)

1 = Reference buffer is enabled

Bit 4

VREF_4V: Enables 4-V reference

This bit chooses between 2.42-V and 4.033-V reference.

0 = 2.42-V reference (default)

1 = 4.033-V reference

Bit 3

CLK_EN: CLK connection

This bit determines if the internal oscillator signal is connected to the CLK pin when an internal oscillator is used.

0 = Oscillator clock output disabled (default)

1 = Oscillator clock output enabled

Bit 2

Must be set to '0'

Bit 1

INT_TEST: Test signal selection

This bit determines whether the test signal is turned on or off.

0 = Off (default)

1 = On; amplitude = ±(VREFP – VREFN) / 2400

Bit 0

TEST_FREQ: Test signal frequency

This bit determines the test signal frequency.

0 = At dc (default)

1 = Square wave at 1 Hz

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