Q7-928
Q7-928 User Manual - Rev. First Edition: 1.0 - Last Edition: 3.0 - Author: S.B. - Reviewed by P.Z Copyright © 2016 SECO S.r.l.
28
3.2.3.2
UART interface signals
According to newest Qseven
®
Rel. 2.0 specifications, Q7-928 offers one UART interface, directly managed by i.MX6 processor (all versions).
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 with 10k
Ω
pull-up resistor
Please consider that interface is at TTL electrical level; therefore, please evaluate well the typical scenario of application. If it is not explicitly necessary 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
U1
SP3220ECY
C1+
2
C1-
4
C2+
5
C2-
6
V+
3
V-
7
T1IN
11
EN
1
R1OUT
9
N.C.
12
T1OUT
13
SHDN
16
R1IN
8
N.C.
10
VCC
15
GND
14
C1
CC-100nF/25V
C2
CC-100nF/25V
UART0_RX
UART0_TX
C5
CC-100nF/25V
C4
CC-100nF/25V
C3
CC-100nF/25V
+3.3V_S
+3.3V_S
RS232_TX
RS232_RX
P1
DB9 CONNECTOR
5
9
4
8
3
7
2
6
1
10
11
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
