2.11.2 Power Enable/Power Good
The Mercury XU5 SoC module provides a power enable input on the module connector. This input may be
used to shut down the DC/DC converters and LDOs for 0.72/0.85/0.9 V, 0.85/0.9 V, 0.9 V, 1.2 V, 1.8 V and 2.5
V. The list of regulators that can be disabled via PWR_EN signal is provided in Section 2.11.1.
The PWR_EN input is pulled to VCC_3V3 on the Mercury XU5 SoC module with a 10 kΩ resistor. The
PWR_GOOD signal is pulled to VCC_3V3 on the Mercury XU5 SoC module with a 10 kΩ resistor.
PWR_GOOD is an open collector signal and must not be used to drive a load directly. This signal is pulled
to GND if the on-board regulators fail or if the module is disabled via PWR_EN. The list of regulators that
influence the state of PWR_GOOD signal is provided in Section 2.11.1.
Pin Name Module Connector Pin Remarks
PWR_EN A-10
Floating/3.3 V: Module power enabled
Driven low: Module power disabled
PWR_GOOD A-12
0 V: Module supply not ok
3.3 V: Module supply ok
Table 14: Module Power Status and Control Pins
Warning!
Do not apply any other voltages to the PWR_EN pin than 3.3 V or GND, as this may damage the Mer-
cury XU5 SoC module. PWR_EN pin can be left unconnected.
Do not power the VCC_IO pins (for example by connecting VCC_3V3 to VCC_IO directly) if PWR_EN is
used to disable the module. In this case, VCC_IO needs to be switched off in the manner indicated in
Figure 14.
2.11.3 Voltage Supply Inputs
Table 15 describes the power supply inputs on the Mercury XU5 SoC module. The VCC voltages used as
supplies for the I/O banks are described in Section 2.9.5.
Pin Name Module Connector Pins Voltage Description
VCC_MOD A-1, 2, 3, 4, 5, 6, 7, 8, 9, 11 5 - 15 V ±5% Supply for the 0.72/0.85/0.9 V, 0.85/0.9 V, 0.9
V, 1.2 V, 1.8 V, 3.3 V and 5.0 V voltage regula-
tors. The 2.5 V supply is generated from the
3.3 V supply. The input current is rated at 3 A
(0.3 A per connector pin).
VCC_BAT A-168 2.7 - 3.6 V Battery voltage for MPSoC battery-backed
RAM and battery-backed RTC
Table 15: Voltage Supply Inputs
D-0000-445-001 33 / 64 Version 07, 25.07.2019
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