Xilinx ZC702 User Manual page 61

X-Ref Target - Figure 1-31
U1
XC7Z020
Dual Use IO
(Analog/Digital)
100Ω
VAUX0P
1 nF
VAUX0N
To
100Ω
Header
J49 100Ω
VAUX8P
1 nF
VAUX8N
100Ω
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
ZC702 Board User Guide
UG850 (v1.2) April 4, 2013
AP SoC
To J70.3
XADC_VCC
VCCADC
100 nF
Close to
Package Pins
XADC_AGND
GNDADC
XADC_AGND
V REF (1.25V)
J37
1
V REFP
2
V REFP
100 nF
3
Close to
Package Pins
V REFN
100Ω
V P
1 nF
V N
100Ω
DXP
DXN
Figure 1-31: XADC Block Diagram
shows the XADC header connections.
www.xilinx.com
VCCAUX
Ferrite Bead
1 J38
XADC_VCC Header J40
2
1.8V 150 mV max
U10
ADP123
3
Out In
Gnd
10 µF
XADC_AGND
U29
To Header J40
REF3012
Out In
Gnd
10 µF
Internal
Reference
Ferrite Bead
XADC_AGND
XADC_AGND
Star Grid
Connection
To
Header
J40
Feature Descriptions
VCC5V0 To Header J40
Ferrite Bead
J65
10 µF
Filter 5V Supply
Locate Components on Board
J70
1
2
3
XADC_VCC
J9
GND
J8
UG850_c1_31_030513
VCC5V0
61