Encryption Key Battery Backup Circuit - Xilinx ZCU104 User Manual

Encryption Key Battery Backup Circuit

The XCZU7EV MPSoC U1 implements bit stream encryption key technology. The ZCU104
board provides the encryption key backup battery circuit shown in
X-Ref Target - 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 XCZU7EV MPSoC U1 V
The battery supply current I
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.
ZCU104 Board User Guide
UG1267 (v1.1) October 9, 2018
Figure 3-2: Encryption Key Backup Circuit
specification is 150 nA maximum when board power is off.
BATT
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Chapter 3: Board Component Descriptions
Figure
CC_PSBATT
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3-2.
X20247-013018
pin Y23.
22