emPC-CX+
(
System Reference
Manual)
Hardware details
1 - 15
Rev. 1.2
©
Janz Tec AG
are mapped in industry standard mode. Driven
to
GND
to
indicate
open
LDI
mode.
Implemented by Jumper J2 on the emPC-CX+
(J2=set corresponds to low).
DCCLK/DCDAT
BiDir
I2C Interface to detect and configure the display
(display specific). Also used for backlight control.
These signals are connected to COM Express
LVDS_I2C_CLK and LVDS_I2C_DAT.
The following LVDS cable components are recommended:
Socket
Samtec EHF-120-01-xxxx
Cable
Samtec FFSD-20-D-xxxx
Backlight intensity control is performed by the LVDS I2C interface. Refer to the COM Express module
vendors description for applicable libraries or interfaces.
1.7
Display Touch- and Power-Connector
1
RxD
TxD
2
3
RTS
GND
4
5
PSON#
+5V
6
7
GND
+3V3
8
9
GND
VIN
10
11
GND
VIN
12
13
GND
VIN
14
15
USB+
USB-
16
17
GND
+5V
18
19
n.c.
n.c.
20
Table 7: Display and touch- and power connector (internal)
All signals have/tolerate LVTTL Level, except USB signals. The signals have the following functions:
Signal Names
Sig-Dir
Description
RxD
Input
Serial port receive signal for touch (COM2)
TxD
Output
Serial port transmit signal for touch (COM2)
RTS
TBD
RTS handshake for touch (COM2)
PSON#
Output
Power supply control signal for display power
supply unit. Signal is low to turn power supply
on.
GND
-
Reference Signal
+3V3/+5V
-
+3.3V/5V power supply for use on display
interface circuit. This power supply is on as long
as the COM Express module is running (S0
state). This power supply is not switched when
the display is turn off.
VIN
-
Input power supply fed through for display
interface logic. Display and Touch power use
this power supply to generate required power
supplies (e.g. +12V).
USB+/USB-
-
Internal USB interface for touch (COM Express
USB4)
Summary of Contents for emPC-CX+
Page 8: ......
