Encryption Key Battery Backup Circuit - Xilinx VCU118 User Manual

Encryption Key Battery Backup Circuit

The XCVU9P device U1 implements bitstream encryption key technology. The VCU118
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 XCVU9P device U1 VBATT pin AT11. The battery supply
current I specification is 150 nA maximum when the board power is off. B1 is charged
BATT
from the SYS_1V8 1.8V rail through a series diode with a typical forward voltage drop of
0.38V and 4.7 KΩ current limit resistor. The nominal charging voltage is 1.42V.
X-Ref Target - Figure 3-1
VCU118 Board User Guide
UG1224 (v1.0) December 15, 2016
To VBATT pin
U1.AT11
Figure 3-1: Encryption Key Backup Circuit
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Chapter 3: Board Component Descriptions
Figure
X18008-100416
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3-1. The Seiko
20