The power specifications stated herein apply to the capabilities of the Intel® Joule™ module itself. The power specifications will vary for the reference expansion board designed by Intel or for a carrier board that you design yourself. See the Power Subsystem and Accessory Signaling topic in the Expansion Board Design Guide and Powering the Expansion Board in the Expansion Board Hardware Datasheet for more details.
Main Power Supply (VSYS)
The Intel® Joule™ module requires VSYS source routed through 12 pins, 6 on each board-to-board connector, that must all be connected in common to balance the current path.
This is the only power input path; voltage detection at +VDC_IN_SENSE or +VBUS_SENSE will trigger module boot.
|Caution: It is NOT possible to supply VSYS directly from any USB power supply, as the USB operating specification of 4.75V to 5.25V may exceed the safe operational range of the module.|
|0 VDC||0 VDC||> +VSYS (min)||No Boot|
|0 VDC||> VBUS_SENSE (min)||> +VSYS (min)||Cold Boot|
|> VDC_IN_SENSE (min)||0 VDC||> +VSYS (min)||Cold Boot|
|> VDC_IN_SENSE (min)||> VBUS_SENSE (min)||> +VSYS (min)||Cold Boot|
Power on Signaling
VDC_IN_SENSE power sensing
VDC_IN_SENSE is the signal that indicates when the module is being powered from an external power source.
When no RTC battery is present, the system will boot when both +VDC_IN_SENSE and VSYS are at a valid level.
VBUS_SENSE power sensing
The VBUS_SENSE pin is used by the module to detect if power is present on the USB connector of the attached expansion board. If the +VBUS_SENSE pin is within the voltage range specified in the table below, then the module will initiate a boot.
The module will assert the PMIC_PWRGOOD signal HIGH after the VDD1 and VDD3 rails are within specification. Expansion board and mezzanine board designs must ensure that circuitry does not interfere with the state of the compute module boot strap pins. See the Boot Strap Signal Isolation in the Expansion Board Design Guide for details.
Power button behavior
The Intel® Joule™ module has a single Power Button pin (PMIC_PWRBTN_N) that will:
- trigger a shutdown of the module when held LOW for longer than 10 seconds.
- trigger standby mode on the module when held LOW for more than 2 seconds but less than 10 seconds.
System voltage rail specifications
|+VSYS||3.6||4||5.25||Volts||4||Amps||Input||Powers the core logic and radios. Recommend using 5V if using the CSI cameras|
|+VDD3||3.1||3.3||3.45||Volts||300||mA||Output||General use. Powers on prior to VDD1|
|+5P0V_VCONN||4.75||5||5.25||Volts||300||mA||Input||Voltage for USB-C VCONN to CC1 or CC2|
|+VDD1||1.71||1.8||1.89||Volts||300||mA||Output||General use. Power on after +VDD3|
|+VRTC||2.05||3.3||Volts||20||500||uA||Input||RTC backup voltage - supplies voltage to RTC logic when the system is not-powered.|
Power sense signals
|VBUS_SENSE||4||5||20||Volts||20||uA||Input||Voltage sense for +VBUS power|
|VDCIN_SENSE||4||12||20||Volts||20||20||uA||Input||Voltage sense for +VDC_IN power|
|VBATT_SENSE||0||3.8||5||Volts||<20||uA||Input||Voltage detection for battery. May be used to configure battery voltage as a gate to boot.|