Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 57 of 76
Table 31. Common-Mode, Reference, and Shield Drive Control Register (CMREFCTL) Address 0x05, Reset Value = 0xE00000
R
/W
Default Bit Name Function
R/W 1 23 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 1 22 LLCM
R/W 1 21 RACM
R/W 0 [20:15] Reserved Reserved, set to 0.
R/W 0 14 LARLD RLD summing junction.
0 (default)
= does not contribute to RLD input.
1 = contributes to RLD input.
R/W 0 13 LLRLD
R/W 0 12 RARLD
R/W
0
[11:10]
Reserved
Reserved, set to 0.
R/W 0 9 CERLD RLD summing junction.
0 (default)
= does not contribute to RLD input.
1 = contributes to RLD input.
R/W 0 8 CEREFEN Common electrode (CE) reference, see Table 11.
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 0 3 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 0 2 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 0 1 RLDSEL Enable right leg drive reference electrode.
0 (default)
= disabled.
1 = enabled.
R/W 0 0 SHLDEN Enable shield drive.
0 (default)
= shield drive disabled.
1 = shield drive enabled.