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4.2.3. Powering on the eMMC or micro SD
The LinkIt 2523 HDK supports eMMC and micro SD card for storage. The HDK operates with either eMMC or micro SD
card enabled but not both at the same time.
4.2.4. Powering on an active GPS antenna
The active GPS antenna on LinkIt 2523 HDK can be either software controlled or hardware activated. Table 3 provides
details on how to determine if the antenna is activated by direct power supply or by software control. Adjust the
jumpers J5201 and J5202 to change the settings. The jumper locations are shown in Figure 8.
Table 3. Enabling the active GPS antenna on MT2523G with jumper pin settings (illustrated)
Connect the jumper J5201 pins to enable the active GPS antenna using the power rail, as shown below.
4.2.5. The LCM backlight power source ISINK
For display function, there is one LED driving current sink for LCM backlight function which the pin name is ISINK. Users
are able to adjust the current by setting. Please be aware about the LCM current and voltage needed to meet the LCM
requirement; also including the maximum current and voltage loading limitation of ISINK pin.
When the current sink is activated, LED9209 will be powered on to indicate users backlight enable. Please refer to Table
7 for more details and to Figure 9 for the LED locations on the HDK.
4.2.6. PSRAM power source
The PSRAM power source can be set to either always power on or could be controlled by user setting. Table 4
provides the jumper settings for each of the methods. Both of J1105 and J1113 could be adjusted for PSRAM power
source.
This document contains information that is proprietary to MediaTek Inc. ("MediaTek") and/or its licensor(s).
Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.
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LinkIt 2523 HDK User's Manual
Table 4. PSRAM power source selection jumpers
© 2015 - 2016 MediaTek Inc.
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