Cooling Fan Connector; Power Good Indicator Leds - Xilinx VCK190 Series User Manual

Cooling Fan Connector

[Figure 3, callout 34]
The VCK190 cooling fan connector is shown in the following figure. The VCK190 uses the
Maxim MAX6643 (U64) 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
ACAP's DXP and DXN pins. The fan rotates slowly (acoustically quiet) when ACAP U1 is cool and
rotates faster as the ACAP heats up (acoustically noisy).
The fan speed (PWM) versus the ACAP 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 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 setting shown in the figure.
Note: When J234 pins 1 and 2 are jumpered to enable fan controller functionality, at initial board power on
it is normal for the fan controller to energize the fan at full speed for a few seconds.
UG1366 (v1.0) January 7, 2021
VCK190 Board User Guide
Figure 23: Power Good Indicator LEDs
Chapter 3: Board Component Descriptions
X24955-121420
Send Feedback
www.xilinx.com
62