ZCU102 Evaluation Board User Guide www.xilinx.com 23
UG1182 (v1.2) March 20, 2017
Chapter 3: Board Component Descriptions
Encryption Key Backup Circuit
The XCZU9EG MPSoC U1 implements bitstream encryption key technology. The ZCU102
board provides the encryption key backup battery circuit shown in Figure 3-2
The Seiko TS518FE rechargeable 1.5V lithium button-type battery B1 is soldered to the
board with the positive output connected to the XCZU9EG MPSoC U1 V
CC_PSBATT
pin AA22.
The battery supply current I
BATT
specification is 150 nA maximum when board power is off.
B1 is charged from the UTIL_1V8 1.8V rail through a series diode with a typical forward
voltage drop of 0.38V and 4.7 ΩK current limit resistor. The nominal charging voltage is
1.42V.
X-Ref Target - Figure 3-2
Figure 3-2: Encryption Key Backup Circuit
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