Xilinx ML605 Hardware User's Manual page 74

Chapter 1: ML605 Evaluation Board
ML605 Board Power Monitor
In addition to monitoring the FPGA core supply power consumption, two auxiliary analog
input channels (of the 16 that are available) are used to implement a power monitor for the
entire ML605 board. The board power is monitored at the 12V power input connector.
Figure 1-31
Monitor auxiliary input channels 12 and 13. A simple resistor divider is used to monitor
the 12V supply voltage and to provide a reference voltage to an instrumentation amplifier
(InAmp). The voltage on the auxiliary channel 12 is equal to supply voltage divided by 24
(~ 0.5V).
The InAmp is used to amplify (by a factor of 50) the voltage dropped across a 2 mΩ current
sense shunt. The voltage at the output of the InAmp is proportional to the current. The
voltage on auxiliary channel 13 = Current (amps) x 0.002 x 50 (e.g., 5A = 0.5V).
X-Ref Target - Figure 1-31
12V Supply Monitor
100nF
±0.5%
11.5k
~0.5V
499
±0.5%
~470
74
Send Feedback
shows how the power monitor is implemented and connected to the System
2m
±1%
R1
R2
K1 K2
IN+
IN-
INA213
V+
~470
OUT
SC70-6
Package
REF
50V/V
10nF
GND
10nF
Figure 1-31: ML605 12V Power Monitor
www.xilinx.com

1k
V
AUXP[13]
Current Channel
10nF
V
AUXN[13]

1k

1k
V
AUXP[12]
10nF Voltage Channel
V
AUXN[12]

1k
UG534_38 _081209
ML605 Hardware User Guide
UG534 (v1.9) February 26, 2019