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KC705 Evaluation Board
67
UG810 (v1.3) May 10, 2013
Feature Descriptions
The KC705 board supports both the internal FPGA sensor measurements and the external
measurement capabilities of the XADC. Internal measurements of the die temperature,
VCCINT, VCCAUX, and VCCBRAM are available. The KC705 board VCCINT and
VCCBRAM are provided by a common 1.0 V supply.
Jumper J47 can be used to select either an external differential voltage reference
(XADC_VREF) or on-chip voltage reference (jumper J47 2–3) for the analog-to-digital
converter.
For external measurements an XADC header (J46) is provided. This header can be used to
provide analog inputs to the FPGA's dedicated VP/VN channel, and to the VAUXP[0]/
VAUXN[0], VAUXP[8]/VAUXN[8] auxiliary analog input channels. Simultaneous
sampling of Channel 0 and Channel 8 is supported.
A user-provided analog signal multiplexer card can be used to sample additional external
analog inputs using the 4 GPIO pins available on the XADC header as multiplexer address
lines.
shows the XADC header connections.
X-Ref Target - Figure 1-37
Figure 1-37:
Header XADC_VREF Voltage Source Options
FPGA
U1
VAUX0N
VAUX0P
VAUX
8
N
VAUX
8
P
VREF (1.25V)
VREFN
VCCADC
GNDADC
VN
VP
DXP
DXN
UG
8
10_c1_
3
0_042
3
1
3
100
Ω
1 nF
100
Ω
100
Ω
1 nF
100
Ω
To
He
a
der
J46
D
ua
l U
s
e IO
(An
a
log/Digit
a
l)
100
Ω
1 nF
100
Ω
To
He
a
der
J46
100 nF
XADC_AGND
REF
3
012
U42
O
u
t
In
Gnd
J47
XADC_AGND
Intern
a
l
Reference
To He
a
der J46
10
μ
F
Ferrite Be
a
d
100 nF
1 nF
Ferrite Be
a
d
J4
3
J42
S
t
a
r Grid
Connection
J69
XADC_VCC
XADC_AGND
GND
VREFP
VREFP
ADP12
3
U
3
9
O
u
t
In
Gnd
XADC_AGND
1
μ
F
XADC_VCC He
a
der J46
100 nF
XADC_AGND
To J69.
3
XADC_VCC
J4
8
Ferrite Be
a
d
VCCAUX
VCC5V0
10
μ
F
AV_5V To He
a
der J46
1.
8
V 150 mV m
a
x
J6
8
Filter 5V
Su
pply
Loc
a
te Component
s
on Bo
a
rd
Clo
s
e to
P
a
ck
a
ge Pin
s
Clo
s
e to
P
a
ck
a
ge Pin
s