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Chapter 3 Hardware

CoreModule 720 Reference Manual 33

Battery

Table 3-20 lists the pin signals of the External Battery Input header for backup RTC (Real Time Clock),

which uses 2 pins with 0.049" (1.25mm) pitch.

Note: The shaded table cells denote power or ground. The RTC pin has an expected current draw of

~36A at room temperature. The battery is used only when power is not applied to the board.

Ethernet External LED

This header provides signals for an external LED that indicates Ethernet links and activity using a single row

of 4 pins with 0.049" (1.25mm) pitch.

Note: The shaded table cell denotes power.

Miscellaneous

SSD (Solid State Drive)

The CoreModule 720 provides an 8GB SATA SSD, which is soldered directly onto the board. For more

information refer to the SSD data sheet: http://www.greenliant.com/dotAsset/45628.pdf

Real Time Clock (RTC)

The CoreModule 720 contains a Real Time Clock (RTC). The RTC can be backed up with a battery. If the

battery is not present, a battery-free boot function in the BIOS completes the boot process and resets the

clock to the default date and time.

Table 3-20. External Battery Input Header (J20)

Pin # Signal Description

VBAT_EXT +3.0 volts DC

GND Ground

Table 3-21. Ethernet External LED Pin Signals (J9)

Pin # Signal Description

V3.3_CONN +3 volts – Provides +3 volts to external LED (Pins 1-2 for Green

LED)

2 ETH_ACT_LED Ethernet Activity

3 ETH_LINK100_LED Fast Ethernet Link with +3 volts power (Pins 3-4 for Bi-Color

LED)

4 ETH_LINK1000_LED Gigabit Ethernet Link

NOTE Some operating systems require a valid default date and time to function.

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Adlink CoreModule 720 Manual de usuario Pagina 39