ZCU111 Board User Guide 80
UG1271 (v1.1) August 6, 2018 www.xilinx.com
Chapter 3: Board Component Descriptions
Cooling Fan Connector
[Figure 2-1, near callout 10]
The ZCU111 cooling fan connector is shown in Figure 3-32.
The ZCU111 uses the Infineon MAX6643 (U52) fan controller, which autonomously controls
the fan speed by controlling the pulse width modulation (PWM) signal to the fan based on
the die temperature sensed via the FPGA's DXP and DXN pins. The fan rotates slowly
(acoustically quiet) when the RFSoC is cool and rotates faster as the FPGA heats up
(acoustically noisy).
The fan speed (PWM) versus the RFSoC die temperature algorithm along with the over
temperature set point and fan failure alarm mechanisms are defined by the strapping
resistors on the MAX6643 device. The over temperature and fan failures alarms can be
monitored by any available processor in the RFSoC by polling the I2C expander U22 on the
I2C0 bus. See the MAX6643 [Ref 24] data sheet for more information on the device circuit
implementation on this board.
Note:
At initial power on, it is normal for the fan controller to energize at full speed for a few
seconds.
VADJ_FMC Power Rail
The ZCU111 evaluation board implements the ANSI/VITA 57.4 IPMI support functionality.
The power control of the VADJ_FMC power rail is managed by the U42 system controller.
This rail powers the FMCP HSPC (J26) VADJ pins, as well as the XCZU28DR HP banks 65, 66.
The valid values of the VADJ_FMC rail are 1.2V, 1.5V, and 1.8V.
At power on, the system controller detects if an FMC module is installed on J26:
• If no card is attached to the FMCP connector, the VADJ voltage is set to 1.8V
X-Ref Target - Figure 3-32
Figure 3-32: 12V Fan Header
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