AMD Xilinx ZCU670 User Manual page 24

The Seiko TS621E rechargeable 1.5V lithium button-type battery B1 is soldered to the board
with the positive output connected to the ZU67DR RFSoC U1 VCC_PSBATT pin AE29. The
battery supply current IBATT specification is 150 nA maximum when board power is off. B1 is
charged from the VCC1V8 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.
I/O Voltage Rails
The ZU67DR RFSoC PL I/O bank voltages on the ZCU670 board are listed in the following table.
Table 6: I/O Voltage Rails
ZU67DR
PL Bank 65
PL Bank 66
PL Bank 67
PL Bank 88
PS Bank 500
PS Bank 501
PS Bank 502
PS Bank 503
UG1532 (v1.0) March 30, 2022
ZCU670 Board User Guide
Figure 6: Encryption Key Battery Backup Circuit
Power Net
Voltage
Name
VCC1V2 1.2V PL_DDR4_C0_DQx, MSP430_UCA1, UART2
VCC1V2 1.2V PL_DDR4_C0_Ax, USER_SI570_C0, SI5381_PL_CLK,
ADCIO[08:15], DACIO[08:15]
VCC1V8 1.8V ADCIO[00:07], DACIO[0:07], SI5381_CLK2_IN,
8A34001_Q3_OUT, SI5381_CLK_125,
CLK104_CLK_SPI_MUX_SEL[0:1]
VCC1V8 1.8V SYSMON_SDA/SCL, CPU_RESET, GPIO_SW_PL,
SI5381_CLK104_MUX_SEL, SI53340_MUX_GT_SEL,
SI53340_MUX_GTR_SEL, CLK104_PL_CLK,
8A34001_Q2_OUT, MUX_PL_SYSREF,
8A34001_CLK6_IN, GPIO_LED[0:3],
MSP430_GPIO[0:3]
VCC1V8 1.8V MIO_LED/PB, UART0, MIO_I2C0/1, PS_GPIO2, QSPI
LWR/UPR
VCC1V8 1.8V SDIO I/F, PMU_GPO[0:5], SFP[0:3]_TX_DISABLE,
PMU_INPUT
VCC1V8 1.8V ENET I/F, USB (3.0) I/F
VCC1V8 1.8V PS CONFIG I/F, JTAG I/F
Chapter 3: Board Component Descriptions
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