Question:
(1) On the ADIN1100CCPZ data sheet Rev.C, in table 8, "PIN CONFIGURATION AND FUNCTION DESCRIPTIONS" section, pin 6 is labeled LED_1, pin 18 and pin 21 are listed as DNC.
On the "EVAL-10BT1L-MCS-BZ" Evaluation Board, pin 6 is labeled GND, pin 18 is labeled CEXT_1, and pin 21 is labeled CEXT_4... And pin 18 is connected to a 4.7uF capacitor to GND, and pin 21 is connected to a 1uF capacitor to GND?
What is the correct pin connection for this device?
Answers:
Advisable to adhere to the Data sheet, hence DNC. These eval-board in question may have done it with different silicon version with optional tests in mind and can be used as population option for these capacitor For your design please design these pins as DNC, or if already done so please de-populate these caps. Also If you intent to use LED_1 (pin 6, ADIN1100 only), please design as shown in example schematic, SPE technology with SPoE, DEMO-ADIN1100D2Z Evaluation Board | Analog Devices), which is a media converter that includes both SPoE and APL (Ethernet‑APL).