Xilinx ZC706 User Manual

ZC706 Evaluation Board User Guide www.xilinx.com 82
UG954 (v1.5) September 10, 2015
Feature Descriptions
Cooling Fan
The XC7Z045 AP SoC cooling fan connector is shown in Figure 1-36.
When V
ADJ
is modified from a default of 2.5V to 1.8V or a lower V
ADJ
setting, the AP SoC U1
cooling fan turns off. Transistor Q1 is used to switch on the fan and has a max VGS of 2V,
hence the fan is not guaranteed to work at 1.8V or lower V
ADJ,
setting. See [Ref 15].
The fan turns on when the ZC706 is powered up due to pull-up resistor R369. The
SM_FAN_PWM and SM_FAN_TACH signals are wired to XC7Z045 AP SoC U1 pins AB19 and
Table 1-38: Power Rail Sequence On Dependencies for UCD90120A PMBus Controller at Address 101
Device Address Rail
Nominal
Voltage
Turn On Order Turn On Timing
UCD90120A 101d
1 VCCINT 1.000 1 Turn on at board power-on
2 VCCAUX 1.800 2 5ms after VCCINT hits 90%
5 VCC3V3_FPGA 3.300 3 5ms after VCCAUX hits 90%
3 VCC1V5_PL 1.500 4 5ms after VCC3V3 hits 90%
4 VADJ_FPGA 2.500 5 5ms after VCC1V5_PL hits 90%
X-Ref Target - Figure 1-36
Figure 1-36: Cooling Fan Circuit
SM FAN TACH
SM FAN PWM
R279
10.0K
1/10W
1%
R278
10.0K
1/10W
1%
1
2
1 2
2 4
1
3
R190
4.75K
1/10W
1%
Q1
1.3W
NDT3055L
VADJ
GND GND
J61
Keyed Fan Header
VCC12_P
R369
1.00K
1/16W
1%
1
2
1
2
D2
MM3Z2V7B
2.7V
460MW
2
1
D1
DL4148
100V
460MW
22_11_2032
1
2
1
2
3
UG954_c1_36_073013
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Xilinx ZC706 Specifications

General

Brand	Xilinx
Model	ZC706
Category	Motherboard
Language	English