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3.2.7
UART interface signals
According to Qseven® Rel. 2.1 specifications, Q7-C26 offers one UART interface, directly managed by i.MX8 processor (all versions).
Here following the signals related to UART interface:
UART0_TX: UART Interface, Serial data Transmit (output) line, +3.3V_RUN electrical level.
UART0_RX: UART Interface, Serial data Receive (input) line, +3.3V_RUN electrical level.
UART0_RTS#: UART Interface, Handshake signal, Request to Send (output) line, +3.3V_RUN electrical level.
UART0_CTS#: UART Interface, Handshake signal, Clear to Send (Input) line, +3.3V_RUN 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
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-C26
Q7-C26 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0
U1
1
C1+
VCC
C4
CC-100nF/25V
3
C1-
GND
11
UART0_TX
T1IN
T1OUT
10
UART0_RTS#
T2IN
T2OUT
12
UART0_RX
R1OUT
R1IN
9
UART0_CTS#
R2OUT
R2IN
4
C2+
C5
CC-100nF/25V
5
C2-
SP3232ECY
Author: A.R - Reviewed by S.R. - Copyright © 2020 SECO S.p.A
+3.3V_S
P1
16
5
C1
CC-100nF/25V
15
4
14
RS232_TX
3
7
RS232_RTS#
13
2
RS232_RX
8
RS232_CTS#
1
2
V+
C2
6
CC-100nF/25V
DB9 CONNECTOR
V-
C3
CC-100nF/25V
10
9
8
RS232_CTS#
7
RS232_RTS#
6
11
29
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