CCOMe-C79
CCOMe-C79 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by E.S. Copyright © 2021 SECO S.p.A.
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BUF_SUS_S5#:
ctly from COM Express module, it is biased using a Ultra High Speed CMOS buffer. Active Low Output
Signal, +3.3V_ALW
system is in Soft Off (S5) state.
WDT: Watchdog event indicator Output. When this signal goes high (active), it reports that internal Watchdog
’
s timer expired without being triggered, neither via HW
nor via SW. It is an active high signal
PWRBTN#: Power Button event signal input, used to bring a system out of S5 soft off and other suspend states, as well as powering the system down. Active low
output signal. This signal can be directly driven by M2 pushbutton (par.3.3.20) and upon its pressure, the pulse of this signal will let the switched voltage rails turn
on or off.
WAKE1#: General Purpose Input wake up signal used to report that a general Wake-up event has occurred, and consequently the module must turn itself on. Active
Low Input signal
SLEEP#: Sleep Button event signal input, used to bring a system in sleep state or wake it up again. Active Low Input signal. This signal can be directly driven by M4
pushbutton (par. 3.3.203.3.20) and upon its pressure, the pulse of this signal will let the transition of the module from Working to Sleep status, or vice versa.
TPM_PP: Trusted Platform Module (TPM) Physical Presence, Active high Input Signal
External BIOS SPI Flash header
In case that an external Flash is needed, then on the carrier board it is provided access to this
interface through a dual-row 8-pin SMT male pin-header, p. 1.27mm, type TOWNES P1035-
2*04MGF-084-D or equivalent, with pinout shown in the table on the left.
Signal description:
SPI_CS#: Chip Select Signal for SPI device, Active Low Output Signal, SPI_POWER electrical level
SPI_MISO: Data in to COM Express Module from Carrier SPI device
SPI_WP#:
from writing is automatically
removed.
SPI_POWER: Dedicated Power supply sourced from COM Express Module for SPI devices. +3.3V or +1.8V electrical level depending on the module.
SPI_HOLD#: this signal too is tied, through a 10k
Ω
resistor, to SPI_POWER signal. This means that when the Flash is powered, the Hold condition of serial
communication is automatically removed.
External BIOS Flash Header CN28
Pin Signal
Pin Signal
1
SPI_CS#
2
SPI_POWER
3
SPI_MISO
4
SPI_HOLD#
5
SPI_WP#
6
SPI_CLK
7
GND
8
SPI_MOSI
