5
Power
5.1
Power Input
The ST1 base board can be powered using one of the power input sources listed below:
•
External power connection through J1701 barrel jack connector
•
Internal power connection through J1700 connector
5.2
Power Generation Overview
Table 18 describes the power supplies available on the base board.
Voltage
Voltage
Rated
Voltage
Enable
Power Good
Supply Name
Value
Current
Origin
Signal
Signal
VCC_5V
5.0 V
2 A
Base
board
(VCC_MAIN)
VCC_MAIN
N/A
VCC_1V2
1.2 V
0.8 A
Module
(VCC_3V3_MOD)
PWR_GOOD
POR#_LOAD#
VCC_3V3_FTDI
3.3 V
0.15 A
VCC_USBUB (primary
voltage
source)
or
VCC_3V3_MOD (sec-
ondary source)
VCC_USBUB
/
VCC_3V3_MOD
N/A
Table 18: Generated Power Supplies
The 3.3 V voltage coming from the Mercury module (VCC_3V3_MOD) is sequenced on the base board
(VCC_3V3) using a load switch with PWR_GOOD as enable signal.
VCC_OUT_A, VCC_OUT_B and VCC_FMC_VIOB are voltage inputs to the ST1 base board coming
from the Mercury module, respectively from the FMC card.
VCC_OUT_C voltage, generated on the Mercury module, is accessible on test point TP301. This voltage
source is not used on the base board.
Warning!
The maximum available output current for each voltage supply depends on your design. Make sure
that the Mercury module I/O banks and the FMC cards do not draw more current than available on
the output of the DC/DC converter.
D-0000-456-001
26 / 48
Version 02, 23.07.2020
