ADS1298R Lead OFF问题

各位老师：

ADS1298R的Lead OFF功能要怎么使用呢，具体的寄存器怎么配置？板子是使用TI的EVB公板。

另外我如果不使用右脚驱动，改用屏蔽网驱动行吗？

ADS1298R的关于 Lead-Off的寄存器：

LOFF: Lead-Off Control Register
Address = 04h
register.

The Lead-Off Control Register configures the Lead-Off detection operation.
Bits[7:5] COMP_TH[2:0]: Lead-off comparator threshold
These bits determine the lead-off comparator threshold level setting. See the Lead-Off Detection subsection of the
ECG-Specific Functions section for a detailed description.
Comparator positive side
000 = 95% (default)
001 = 92.5%
010 = 90%
011 = 87.5%
100 = 85%
101 = 80%
110 = 75%
111 = 70%
Comparator negative side
000 = 5% (default)
001 = 7.5%
010 = 10%
011 = 12.5%
100 = 15%
101 = 20%
110 = 25%
111 = 30%
Bit 4 VLEAD_OFF_EN: Lead-off detection mode
This bit determines the lead-off detection mode.
0 = Current source mode lead-off (default)
1 = Pull-up/pull-down resistor mode lead-off
Bits[3:2] ILEAD_OFF[1:0]: Lead-off current magnitude
These bits determine the magnitude of current for the current lead-off mode.
00 = 6nA (default)
01 = 12nA
10 = 18nA
11 = 24nA
Bits[1:0] FLEAD_OFF[1:0]: Lead-off frequency
These bits determine the frequency of lead-off detect for each channel.
00 = When any bits of the LOFF_SENSP or LOFF_SENSN registers are turned on, make sure that FLEAD[1:0] are either
set to 01 or 11 (default)
01 = AC lead-off detection at fDR/4
10 = Do not use
11 = DC lead-off detection turned on

LOFF_SENSP
Address = 0Fh
This register selects the positive side from each channel for lead-off detection. See the Lead-Off Detection
subsection of the ECG-Specific Functions section for details. Note that the LOFF_STATP register bits are only
valid if the corresponding LOFF_SENSP bits are set to '1'.
Note that registers bits[5:4] are not available for the ADS1294/4R. Bits[7:6] are not available for the
ADS1294/6/4R/6R.

LOFF_SENSN
Address = 10h
This register selects the negative side from each channel for lead-off detection. See the Lead-Off Detection
subsection of the ECG-Specific Functions section for details. Note that the LOFF_STATN register bits are only
valid if the corresponding LOFF_SENSN bits are set to '1'.
Note that registers bits[5:4] are not available for the ADS1294/4R. Bits[7:6] are not available for the
ADS1294/6/4R/6R.

LOFF_FLIP
Address = 11h
This register controls the direction of the current used for lead-off derivation. See the Lead-Off Detection
subsection of the ECG-Specific Functions section for details.

LOFF_STATP (Read-Only Register)
Address = 12h
BIT 7 BIT 6 BIT

LOFF_STATN (Read-Only Register)
Address = 13h