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The expansion board provides two clock signals on the breakout connectors, a 19.2 MHz clock and a 32.768 kHz real time clock (RTC). The following two sections provide the AC and DC specifications for both of these clock signals.

Power Up, Power Down, and Reset

The sequences outlined in this section can vary depending on the BIOS version, operating system setting, device state when sequence is initiated and the specific expansion board hosting the compute module. While deemed accurate, material presented is not absolute for all configurations.

Once power on is initiated, the platform resets devices, energizes power supplies on the expansion board and begins to execute the firmware (BIOS) code.

Thermal Control Methods

The methods to control thermal energy generated by Intel® Joule™ compute module fall in to three broad categories: passive cooling, active cooling, and firmware controls.

Passive heat dissipation or cooling involves either the convection of heat directly from the module’s thermal plate to the environment (only appropriate for very low power applications), or the conduction of heat from the thermal plate to a passive heatsink.

Platform Power Supply (Simplistic Model)

The figure below describes a simple power supply for a minimalistic expansion board design using an external 12-VDC, 3-A power supply connected directly to the DC input path.

Any DC input must have adequate protection, for example a reverse-current blocking diode, a fuse, and an ESD transient suppression diode. This DC input path must also have sufficient decoupling capacitors before and after the +VSYS buck regulator.

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