Xilinx VCK190 Series User Manual

Figure 23: Power Good Indicator LEDs
X24955-121420
Cooling Fan Connector
[Figure 3, callout 34]
The VCK190 cooling fan connector is shown in the following gure. The VCK190 uses the
Maxim MAX6643 (U64) fan controller, which autonomously controls the fan speed by controlling
the pulse width modulaon (PWM) signal to the fan based on the die temperature sensed via the
ACAP's DXP and DXN pins. The fan rotates slowly (acouscally quiet) when ACAP U1 is cool and
rotates faster as the ACAP heats up (acouscally noisy).
The fan speed (PWM) versus the ACAP die temperature algorithm along with the over
temperature set point and fan failure alarm mechanisms are dened by the strapping resistors on
the MAX6643 device.
The over temperature and fan failures alarms can be monitored either by any available processor
in ACAP U1 by polling the I2C expander U233 on the I2C bus or via the ZU4 U125 System
Controller.
The VCK190 board provides a fan controller bypass header J234 to permit the fan to be always
on. Always on (J234 pins 2 and 3 jumpered) is the default jumper seng shown in the gure.
Note: When J234 pins 1 and 2 are jumpered to enable fan controller funconality, at inial board power on
it is normal for the fan controller to energize the fan at full speed for a few seconds.
Chapter 3: Board Component Descriptions
UG1366 (v1.0) January 7, 2021 www.xilinx.com
VCK190 Board User Guide 62
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Xilinx VCK190 Series Specifications

General

Brand	Xilinx
Model	VCK190 Series
Category	Motherboard
Language	English