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4.6.
RTC
The LinkIt 7687 HDK features an RTC module. The clock source operates at 32.768kHz crystal oscillator or an
external clock source. The RTC has built-in accurate timer to wake up the system when the user defined timer
expires. The RTC uses a different power source from the Power Management Unit (PMU). In hibernate or sleep
mode, the PMU is turned off while the RTC module remains powered on. The RTC module only consumes 3µA in
hibernate mode. The RTC has a dedicated PMU control pin PMU_EN_RTC (pin 23) used to turn the power on when
the RTC timer expires and turn the power off when it intends to enter the hibernate mode.
4.7.
RF connections
By default, the board ships with RF signals routed to the on-board circuit antenna. An on-board U.FL, a conductive
test component, (I-PEX) connector enables to test the signals using a compatible cable. If a user wants to perform
the testing, the user needs to solder the capacitor from the location C93 to C94.
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.
R25
Figure 7. Locations of I2C pull-up resistors
© 2015 – 2016 MediaTek Inc.
LinkIt 7687 HDK V30 User's Guide
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