Electrical Specifications; Rtc Battery - Seco Qseven CQ7-D03 User Manual

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2.3 Electrical Specifications

CQ7-D03 board needs to be supplied with an external 12VDC power supply compliant with USB Power Delivery (PD). All the other voltages necessary

for the working of the board and of the connected peripherals are derived from the main V

Power Connector is a USB Type-C, with pinout according to the standard specification, connected to a Power Delivery Controller IC for sink applications. The Power

Delivery Controller negotiates the 12VDC supply from the compliant power supply.

The cable used for the connection of the power supply must be capable of delivering 5A of continuous current, in order to ensure the proper amperage of the power

section.

When choosing the power supply for CQ7-D03 board, please consider well what is the typical scenario for using the board (i.e., which peripherals will be connected).

Internal power section is able to draw up to 4A from 12V and to supply a maximum of 4.8A @ 5V and 3.8A @ 3.3V for Qseven module and for the external devices

supplied directly by the carrier board (i.e. USB devices, storage modules, display, etc).

It is very important to balance well the typical final configuration, summing all possible power consumptions of devices attached to carrier board.

For example, considering the use case of a connected LVDS panel with typical power consumption of 15W, all USB populated and delivering a full power of 10W,

is possible to use a Qseven or uQseven module with a maximum absorbed power of 10W (this is not the TDP but the peak value of power absorbed by the module

typically reported in the Electrical Specifications section of the module documentation), leaving apart 12.5W of the 3.3V line for the M.2 and miniPCI modules.

This way it is possible to choose a PSU capable to supply enough current for the whole system.

2.3.1

RTC Battery

For the occurrences when the system (Carrier Board + Qseven

for the use of standard coin battery type CR1225 with a nominal capacity of 50mAh, to supply, with a 3V voltage, the Real Time Clock and CMOS memory mounted

on the Qseven

module.

The batteries should only be replaced with devices of the same type. Always check the orientation before inserting and make sure that they are aligned correctly and

are not damaged or leaking.

Never allow the batteries to become short-circuited during handling.

CAUTION: handling batteries incorrectly or replacing with not-approved devices may present a risk of fire or explosion.

Batteries supplied with CQ7-D03 board are compliant to requirements of European Directive 2006/66/EC regarding batteries and accumulators. When putting out

of order CQ7-D03 board, remove the batteries from the board in order to collect and dispose them according to the requirement of the same European Directive

above mentioned. Even when replacing the batteries, the disposal has to be made according to these requirements.

CQ7-D03

power rail.

module) is not powered with an external power supply, on board there is a horizontal battery holder,

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