According to the following 7.8 and 31.2 Hz AC Lead Off excitation frequency is selected via the FLEAD_OFF[1:0] bits in the LOFF register.
9.3.2.4.3.2 AC Lead-Off (One Time or Periodic) In this method, an in-band ac signal is used for excitation. The ac signal is generated by alternatively providing a current source and sink at the input with a fixed frequency. The frequency can be chosen by the FLEAD_OFF[1:0] bits in the LOFF register. The excitation frequency is chosen to be one of the two in-band frequency selections (7.8 Hz or 31.2 Hz). This in-band excitation signal is passed through the channel and measured at the output.
The latest data sheet shows FLEAD_OFF options as
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
01 = AC lead-off detection at fDR / 4
10 = Do not use
11 = DC lead-off detection turned on
What are the correct bit values for selecting 7.8 or 31.3 Hz?
Thanks
Paul
