CMREFCTL Register setting clarification ADAS1000-4

Question

Hi Mark, 
 We are using ADAS1000-4 and ADAS1000-2 in our design. We have connected RA to CM_IN pin of ADAS1000-4. In this configuration, Can you clarify, if we need to set, EXTCM bit (2) in CMREFCTL register to 0 (Internal common mode selected) or 1(external common mode selected). 
 When we set EXTCM to 0: Lead on/off detection is working fine. 
 When we set EXTCM to 1: RA and RLD is showing Lead off. In DC Lead OFF register (0x1E), Bit 13 CE input overrange and Bit 12 RLD input underrange are setting to 1. 
 Thanks and Regards, 
 Subbash

mark.ramos · Accepted Answer

Hi Subbash, 
 Do you have the RA pin routed to CM_IN externally? Why? 
 Normally, for master devices, the EXTCM is set to 0. 
 regards, 
 Mark)

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CMREFCTL Register setting clarification ADAS1000-4