48V Power Domain; 1.14.3.1 Heater Circuit; Clock Structure; Processor Clocks - SMART Embedded Computing MC1600 Installation And Use Manual

1.14.3

-48V Power Domain

The Extreme Edge Server accepts dual (redundant) -48V power inputs with a normal
operating range of -40V to -57V. This voltage range is considered Safety Extra Low Voltage
(SELV). The inputs are ORed together so that the system can run off either one. In addition,
there is an input filter to reduce conducted emissions.
Two isolated power bricks convert the -48V power to the logic domain. One is a 600W
quarter-brick that converts -48V to 12V as an intermediate bus voltage for the payload Point
of Load (POL) converters. The other is a 10W module that converts -48V to 3.3V as
management power for the BMC and Glue CPLD.

1.14.3.1 Heater Circuit

The Extreme Edge Server includes an optional heater circuit that can extend the operating
temperature range of the product down to -40°C. The heater control circuit is autonomous.
The Extreme Edge Server is required to be installed inside a closed, weather protected
location. For installation sites outside of a building, a sealed cabinet is recommended. For
cold weather start-up, wind conditions may overwhelm the server's designed-in heating
elements. In locations where cold airflow is present, the customer may be required to
provide additional heating to the cabinet.
The heater control circuit continuously monitors the heat sink temperature to make sure it
is within the operating temperature range. If it ever approaches the lower operating
temperature limit, the heater turns on again to keep sensitive devices within their operating
temperature range.
1.15

Clock Structure

1.15.1

Processor Clocks

The Broadwell-DE SoC implements Full Integrated Clocking mode as the platform clock
architecture. In the Full Integrated Clocking mode, a 25MHz crystal oscillator provides the
input clock to the SoC which then internally generates the output clocks that are required
by all the platform components.
1.15.2

Other Clocks

The 156MHz clock for the Ethernet switch is provided by the SyncE PLL as described
previously in this document.
MC1600 Extreme Edge Server Installation and Use (6806870A02B)
System Overview
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