LinkIt 2523 HDK v11 User's Guide
© 2015 - 2016 MediaTek Inc.
Page 18 of 82
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Jumpers
Purpose
Features
Type
J5201
Active GPS antenna
control
•
Controlled by power
rail
GPS_VTCXO_SW
•
Software control by net TX2
Power selection, see
J5202
Active GPS antenna
power source
•
Controlled by power
rail
GPS_VTCXO_SW
•
Software control by
external buck LDO
Power selection, see
J6101
J6102
J6103
J6104
J6105
J6106
Display output by serial
jumpers or high speed
connector
•
Select serial pin header by
connecting pin 2 and pin 3.
•
Select MIPI display LCM
connecting pin 1 and pin 2.
GPIO selection, see
R9001
R9002
R9007
R9008
Disable JTAG
interface when
R9002 and R9008
are mounted
Switch of JTAG interface
enable/disable on
keypad and camera
clusters
•
Select JTAG interface enable
on keypad cluster if R9002
and R9007 are mounted.
•
Select JTAG interface on
camera cluster is enabled if
R9001 and R9007 are
mounted.
Strap pin selection, see
section 4.15,
4.4.
LEDs
The LED indicators (see Figure 12 and Figure 13) on the HDK are listed in Table 8.
Table 8. The LED indicators
USB power source
indicator
LED2001 indicates if the power is supplied to both LinkIt 2523 HDK and CMSIS-
DAP using USB connectors.
Buck power
indicator
LED2003 indicates if the power source is from the USB cable and the buck is
enabled.
CMSIS-DAP power
indicator
LED6601 indicates if the CMSIS-DAP power is on. This LED is not mounted on the
HDK v1.1. It can be soldered, if necessary.
eMMC/micro SD
power indicator
LED9201 indicates if the micro SD or eMMC power rail is enabled.
Core power
indicator
LED9206 indicates if the main power rail for LinkIt 2523 HDK core operates
successfully.
Display current sink
indicator
The only amber indicator LED9209 indicates if the backlight of the display panel is
on.