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Encryption Key Backup Circuit
The XCVU190 FPGA U1 implements bitstream encryption key technology. The VCU110
board provides the encryption key backup battery circuit shown in
TS518FE rechargeable 1.5V lithium button-type battery B1 is soldered to the board with the
positive output connected to the XCVU190 FPGA U1 V
current I
specification is 150 nA maximum when board power is off. B1 is charged from
BATT
the SYS_1V8 1.8V rail through a series diode with a typical forward voltage drop of 0.38V
and a 4.7 kΩ current limiting resistor. The nominal charging voltage is 1.42V.
Figure 1-4
shows the encryption key battery backup circuit.
X-Ref Target - Figure 1-4
VCU110 Evaluation Board
UG1073 (v1.2) March 26, 2016
FPGA_VBATT
To U1 pin AN13
Figure 1-4: Encryption Key Backup Circuit
www.xilinx.com
Chapter 1:
VCU110 Evaluation Board Features
Figure
pin AN13. The battery supply
CCBATT
SYS_1V8
1
D15
200 mW
3
40V
BAS40-04
2
R115
1
4.70k
1/16W
2
1%
1
TS518FE_FL35E
2
B1
BAT_TS518FE_FL35E
GND
1-4. The Seiko
14
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