What are voltage threshold in HTL mode (current source off)?

Question

Hi 
 For MAX22196, if CNFGx register is configured with CURRx[1:0]=00 (current source off) , what are voltage threshold on input? I don't find its in datasheet. Table 1 shows that HIHTR don't care. Are they different if CURRx[1:0]=11. 
 In my application, REGEN is short to ground, V24=24V, VA=3.3V and REFDI=12k. 
 Thanks for your help.

ShastaThomas · Accepted Answer

Hello, 
 My apologies for the delayed response on this. 
 I can see how the don't care (X) label is a bit misleading in this case. While the status of the HITHR bit is not required to set the mode to high-impedance or HTL (CURR_ = 00) , it is still required to set the thresholds, as outlined in the datasheet. You need to set the SOURCE and HITHR bits for a given channel to set the threshold, as shown in the EC table on pages 5-6. 
 Setting the CURR_ bits to 11 will put the input channel into TTL mode. The TTL thresholds are also shown in the EC table. 
 Thank you, 
 Shasta)

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What are voltage threshold in HTL mode (current source off)?