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User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 31
4.2.8
LVDS-CMD
TQMa335x
USB_H5[P/N]
LCD.BLT_EN
STKRST#
LCD.PWR_EN
MCASP0.AXR2
12V & 5V
ESD
protection
20-pin
connector
(X18)
Backlight
Illustration 27:
Block diagram LVDS-CMD, X18
The LVDS-CMD connector X18 placed next to the LVDS connector X17 provides control signals for reset and backlight of an LCD
as well as a 5 V and 12 V power supply. It also provides a USB interface. The TQMa335x provides several signals to control the
backlight. The different signals can be selected with an assembly option. MCASP0.AXR2 is the default. See Table 50 for the
available signals and the required component placement.
Table 50:
Placement option for LCD contrast
Signal
R928
R929
R930
R931
R932
R933
GPIO2.0
0 Ω
NP
NP
NP
NP
NP
TIMER.4
NP
0 Ω
NP
NP
NP
NP
TIMER.5
NP
NP
0 Ω
NP
NP
NP
TIMER.6
NP
NP
NP
0 Ω
NP
NP
TIMER.7
NP
NP
NP
NP
0 Ω
NP
MCASP0.AXR2, (default assembly)
NP
NP
NP
NP
NP
0 Ω
Attention:
Depending on the assembly option the available signals can also be used for other functions.
The configuration should be selected unambiguously.
The characteristics in section 4.2.1 also apply to the USB interface.
Table 51:
Characteristics LVDS-CMD
Parameter
Min.
Typ.
Max.
Unit
Current at 12 V
–
–
1
A
Current at 5 V
–
–
1
A