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ZC702 Board User Guide
www.xilinx.com
61
UG850 (v1.2) April 4, 2013
Feature Descriptions
The ZC702 board supports both the internal XC7Z020 AP SoC sensor measurements and the
external measurement capabilities of the XADC. Internal measurements of the die
temperature, VCCINT, VCCAUX, and VCCBRAM are available.
Jumper J37 can be used to select either an external voltage reference (VREF) or on-chip
voltage reference for the analog-to-digital converter.
For external measurements an XADC header (J19) is provided. This header can be used to
provide analog inputs to the XC7Z020 AP SoC'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.
Figure 1-32
shows the XADC header connections.
X-Ref Target - Figure 1-31
Figure 1-31:
XADC Block Diagram
XC7Z020
AP SoC
U1
VAUX0N
VAUX0P
VAUX8N
VAUX8P
VREF (1.25V)
VREFN
VCCADC
GNDADC
VN
VP
DXP
DXN
UG850_c1_31_030513
100
Ω
1 nF
100
Ω
100
Ω
1 nF
100
Ω
To
Header
J49
Dual Use IO
(Analog/Digital)
100
Ω
1 nF
100
Ω
To
Header
J40
100 nF
XADC_AGND
REF3012
U29
Out
In
Gnd
J37
XADC_AGND
Internal
Reference
To Header J40
10
µ
F
Ferrite Bead
Ferrite Bead
J9
J8
Star Grid
Connection
J70
XADC_VCC
XADC_AGND
GND
VREFP
VREFP
ADP123
U10
Out
In
Gnd
XADC_AGND
10
µ
F
XADC_VCC Header J40
100 nF
XADC_AGND
To J70.3
XADC_VCC
J38
Ferrite Bead
VCCAUX
VCC5V0
10
µ
F
VCC5V0 To Header J40
1.8V 150 mV max
J65
Filter 5V Supply
Locate Components on Board
Close to
Package Pins
Close to
Package Pins
1
2
3
1
2
3
1
2
3