ZCU104 Board User Guide 22UG1267 (v1.1) October 9, 2018 www.xilinx.comChapter 3: Board Component DescriptionsEncryption Key Battery Backup CircuitThe XCZU7EV MPSoC U1 implements bit stream encryption key technology. The ZCU104board 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 theboard with the positive output connected to the XCZU7EV MPSoC U1 V CC_PSBATT pin Y23.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 forwardvoltage drop of 0.38V and 4.7 ΩK current limit resistor. The nominal charging voltage is1.42V.X-Ref Target - Figure 3-2Figure 3-2: Encryption Key Backup CircuitX20247-013018Send Feedback
