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3.2.3.2
UART interface signals
®
According to newest Qseven
Rel. 2.0 specifications, Q7-974 offers one UART interface, directly managed by Intel
Here following the signals related to UART interface:
UART0_TX: UART Interface, Serial data Transmit (output) line, 3.3V_S electrical level.
UART0_RX: UART Interface, Serial data Receive (input) line, 3.3V_S electrical level.
UART0_RTS#: UART Interface, Handshake signal, Request to Send (output) line, 3.3V_S electrical level.
UART0_CTS#: UART Interface, Handshake signal, Clear to Send (Input) line, 3.3V_S electrical level.
Please consider that interface is at TTL electrical level; therefore, please evaluate well the typical scenario of application. If it isn't needed explicitly to interface
directly at TTL level, for connection to standard serial ports commonly available (like those offered by common PCs, for example) it is mandatory to include an RS-
232 transceiver on the carrier board.
The following schematic shows an example of implementation of RS-232 transceiver for the Carrier board
UART0_TX
UART0_RTS#
UART0_RX
UART0_CTS#
All schematics (henceforth also referred to as material) contained in this manual are provided by SECO S.r.l. for the sole purpose of supporting the
customers' internal development activities.
The schematics are provided "AS IS". SECO makes no representation regarding the suitability of this material for any purpose or activity and disclaims all
warranties and conditions with regard to said material, including but not limited to, all expressed or implied warranties and conditions of merchantability,
suitability for a specific purpose, title and non-infringement of any third party intellectual property rights.
The customer acknowledges and agrees to the conditions set forth that these schematics are provided only as an example and that he will conduct an
independent analysis and exercise judgment in the use of any and all material. SECO declines all and any liability for use of this or any other material in
the customers' product design
Q7-974
Q7-974 User Manual - Rev. First Edition: 0.1 - Last Edition: 2.3 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
U1
1
C1+
VCC
C4
CC-100nF/25V
3
C1-
GND
11
T1IN
T1OUT
10
T2IN
T2OUT
12
R1OUT
R1IN
9
R2OUT
R2IN
4
C2+
V+
C5
CC-100nF/25V
5
C2-
SP3232ECY
+3.3V_S
16
C1
CC-100nF/25V
15
14
RS232_TX
7
RS232_RTS#
13
RS232_RX
8
RS232_CTS#
2
C2
6
CC-100nF/25V
V-
C3
CC-100nF/25V
®
Atom E38xx SOCs (all versions).
P1
10
5
9
4
8
RS232_CTS#
3
7
RS232_RTS#
2
6
1
11
DB9 CONNECTOR
29
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