Xilinx Kria K26 SOM - SOM Power and Voltage Rails

SOM Power
Your carrier card should provide:
• The SOM main power supply (+5V power rail).
• The V
CCO
power rails for the programmable logic (PL) HPIO and HDIO banks on the K26
SOM.
• Oponally, the carrier card can supply an external baery power to the V
CC_BATT
pin for real-
me clock (RTC) baery backup power.
SOM Connector Power Pins
The following table lists all power rails required for the proper operaon of the K26 SOM. The
carrier card designed for your applicaon should provide these power rails based on the required
peripheral I/O voltage. These supplies must be intenonally sequenced as outlined in the Power
Sequencing secon.
Table 9: SOM Power Rails
Power Rail
Name
Supported Voltage Range
Maximum
Current
Description
V
CC_SOM
5V (4.75V – 5.25V) 50 mV p-p
maximum noise
4A Main power input to the SOM. Supplies power to
on-board power regulators.
V
CC_BATT
1.50V External battery input for the RTC
V
CCO_HPA
1.00V – 1.80V 1.0A Voltage rail for HPIO bank 66
V
CCO_HPB
1.00V – 1.80V 1.0A Voltage rail for HPIO bank 65
V
CCO_HPC
1.00V – 1.80V 1.0A Voltage rail for HPIO bank 64
V
CCO_HDA
1.20V – 3.30V 1.0A Voltage rail for HDIO bank 45
V
CCO_HDB
1.20V – 3.30V 1.0A Voltage rail for HDIO bank 43
V
CCO_HDC
1.20V – 3.30V 1.0A Voltage rail for HDIO bank 44
For the selected I/O type, the supply voltage tolerance at the SOM connector must be within
+3%/–2%. For example:
• If an HPIO bank is congured for the LVDS (1.8V) standard, the V
CCO
at the SOM connector
pin must be within 1.764V–1.854V.
• If an HDIO bank is congured for the LVDS_25 standard, the V
CCO
at the SOM connector pin
must be within 2.450V–2.575V.
Chapter 2: Electrical Design Considerations
UG1091 (v1.0) April 20, 2021 www.xilinx.com
Carrier Card Design for Kria SOM 34
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