Altera Cyclone III Development Board - Manual (Page 74)

2–64 Chapter 2: Board Components
Statement of China-RoHS Compliance
Cyclone III 3C120 Development Board Reference Manual © March 2009 Altera Corporation
Power Measurement
Eight power supply rails have on-board voltage and current sense capabilities. These
measurements are made using an 8-channel differential A/D converter from Linear
Technology, with a serial data bus connected to the MAX II CPLD.
The MAX II CPLD contains a logic design that continually monitors the power rails
and displays the current in mW on the dedicated four-digit 7-segment display. Rotary
switch SW4 is used to select the power rail being displayed. The sense resistor is large
enough that it can be easily probed by a user to confirm the display results. The
results are also accessible from the FPGA through register access across the FSM bus.
Figure 2–18 illustrates the circuit.
Table 2–16 on page 2–21 lists the power measurement rails. The Schematic Signal Name
column lists the power rail being measured, and the power pins/devices attached to
the power rail are listed in the Power Pin Name and Description columns.
Statement of China-RoHS Compliance
Table 2–62 lists hazardous substances included with the kit.
Figure 2–18. Power Measurement Circuit
MAX II Device
SCK
SDI
SDO
CSn
A/D
Load #1
Load #13
Supply #1
R SENSE
R SENSE
Power Select
Quad 7-segment
Display
16:1
Analog
Mux
Amp
Supply #13
MAX II Control
DIP Switch
mA vs. mW
Amps vs. Volts
Table 2–62. Table of Hazardous Substances’ Name and Concentration Notes (1) , (2) (Part 1 of 2)
Part Name Lead (Pb)
Cadmium
(Cd)
Hexavalent
Chromium
(Cr6+)
Mercury
(Hg)
Polybrominated
biphenyls (PBB)
Polybrominated
diphenyl Ethers
(PBDE)
Cyclone III development board X* 0 0 0 0 0
12-V power supply 0 0 0 0 0 0
Type A-B USB cable 0 0 0 0 0 0