Xilinx VCK190 Series User Manual

Figure 5: Encryption Key Backup Circuit
X23376-112420
The Seiko TS621E rechargeable 1.5V lithium buon-type baery B1 is soldered to the board
with the posive output connected to the XCVC1902 ACAP U1 VCC_BATT bank pin AG33. The
baery supply current IBATT specicaon is 150 nA maximum when board power is o. Baery
B1 is charged from the VCC1V8 1.8V rail through a 2 series diode with the rst forward drop to
yield between 0.24V to 0.46V over temperature per xed 5 mA load, R1725, and liming 1.56V
max at the ACAP pin, PSVBATT. The second diode and 4.7 kΩ current limit resistor allows the
baery to trickle charge and prevent baery B1 from back powering R1725.
I/O Voltage Rails
The XCVC1902 ACAP PL I/O bank voltages on the VCK190 board are listed in the following
table.
Note: The VCK190 board is shipped with VADJ_FMC set to 1.5V by the ZU4 system controller.
Table 6: I/O Voltage Rails
ACAP (U1)
Bank
Power Supply Rail
Net Name
Voltage Description
HDIO Bank 306 VCC1V8 1.8V GPIO: PB[0:1], DIP_SW[0:3], LED[0:3]; DC_PL_GPIO[0:3];
SYSCTLR_GPIO[0:5]; UART1_TXD/RXD
HDIO Bank 406 VCC3V3 3.3V HDMI status/ctrl(15)IF; HDIO_UART3_TX/RX;
HDIO_UART4_TX/RX
XPIO Bank 700 VCC1V2_DDR4 1.2V DDR4_DIMM1_DQ[32:63], CB[0:7], ADDR/CTRL;
DDR4_DIMM1_CLK; Si570 U2 200 MHz
XPIO Bank 701 VCC1V2_DDR4 1.2V DDR4_DIMM1_DQ[24:31], ADDR/CTRL
XPIO Bank 702 VCC1V2_DDR4 1.2V DDR4_DIMM1_DQ[0:23], CB[0:7]
Chapter 3: Board Component Descriptions
UG1366 (v1.0) January 7, 2021 www.xilinx.com
VCK190 Board User Guide 24
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Xilinx VCK190 Series Specifications

General

Brand	Xilinx
Model	VCK190 Series
Category	Motherboard
Language	English