5 backlight, Ktam3874/pitx user's guide, 1 power connector backlight pins – Kontron KTAM3874-pITX User Manual

Page 19

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KTD-S0051-D Page

15

Graphics Processing Subsystem


KTAM3874/pITX User's Guide

5.5

Backlight

Backlight is available through the connector J1800. The backlight voltage can be supplied from the on-
board +5V voltage if you set one or two short circuit jumper on connector J2100. For backlight voltages
differing from +5V use pin 9 and/or 11 on connector J2100 to supply the backlight (pins 7 and 8 represent
the associated ground, identical with board ground).
With a GPIO line (GP3[14]) you can switch the brightness signal between an analog (0 - 5.0V) and a PWM
signal.

5.5.1

Power Connector Backlight Pins

The following table is an extract of the J2100 connector overview. For further details about pin 1 see
chapter 'Default Power Configuration'.

Pin

Signal

Description

Type

9

VDD

1)

External backlight voltage input

PWR IN

10

VCC5

1)

Onboard power +5V

PWR

11

VDD

1)

External backlight voltage input

PWR IN

12

VCC5

1)

Onboard power +5V

PWR

7

GND

Backlight ground

PWR

8

GND

Backlight ground

PWR



CAUTION!

If you use an external backlight power supply do not forget the three

system links (pin 13 to 18) otherwise the board does not start.

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