ADAS1000-4BSTZ datasheet(62/80 Pages) AD

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ADAS1000-3/ADAS1000-4

Data Sheet

Table 32. Common-Mode, Reference, and Shield Drive Control Register (CMREFCTL) Address 0x05, Reset Value = 0xE00000

REE

Default

Bit

Name

Function

R/W

LACM

Common-mode electrode select.

Any combination of the five input electrodes can be used to create the common-mode

signal, VCM. Bits[23:19] are ignored when Bit 2 is selected. Common mode is the average of

the selected electrodes. When a single electrode is selected, common mode is the signal

level of that electrode alone. The common-mode signal can be driven from the internal

VCM_REF (1.3 V) when Bits [23:19] = 0.

0 = does not contribute to the common mode.

1 = contributes to the common mode.

R/W

LLCM

R/W

RACM

R/W

[20:15]

Reserved

Reserved, set to 0.

R/W

LARLD

RLD summing junction.

0 (default) = does not contribute to RLD input.

1 = contributes to RLD input.

R/W

LLRLD

R/W

RARLD

R/W

[11:10]

Reserved

Reserved, set to 0.

R/W

CERLD

RLD summing junction.

0 (default) = does not contribute to RLD input.

1 = contributes to RLD input.

R/W

CEREFEN

Common electrode (CE) reference, see Figure 56.

0 (default) = common electrode disabled.

1 = common electrode enabled.

R/W

0000

[7:4]

RLDSEL [3:0]

Select electrode for reference drive.

0000 (default) = RLD_OUT.

0001 = LA.

0010 = LL.

0011 = RA.

0100 to 1111 = reserved.

R/W

DRVCM

Common-mode output. When set, the internally derived common-mode signal is driven

out of the common-mode pin. This bit has no effect if an external common mode is

selected.

0 (default) = common mode is not driven out.

1 = common mode is driven out of the external common-mode pin.

R/W

EXTCM

Select the source of common mode (use when operating multiple devices together).

0 (default) = internal common mode selected.

1 = external common mode selected (all the internal common-mode switches are off).

R/W

RLDSEL

Enable right leg drive reference electrode.

0 (default) = disabled.

1 = enabled.

R/W

SHLDEN

Enable shield drive.

0 (default) = shield drive disabled.

1 = shield drive enabled.

Rev. B | Page 62 of 80

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