Leds - Mediatek Labs LinkIt 7687 HDK V30 User Manual

Jumper
J28
J30
J24
J26
4.3.

LEDs

The LinkIt 7687 HDK has onboard LEDs associated with different functionalities of the board (Figure 5).
1) D6 indicates the power rail 5V is on.
2) D5 indicates the power rail 3.3V is on.
3) D9 (UART Tx) indicates the UART1 transmission is in use (blink, if there is traffic).
4) D10 (UART Rx) indicates the UART1 receiving is in use (blink, if there is traffic).
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Figure 4. Power up the HDK using an AA or AAA Battery (J21)
Table 2. System power input from AA or AAA battery jumpers
Usage
3.3V power supply
Current measurement
RTC 3V3 power supply
Current measurement in RTC mode
© 2015 – 2016 MediaTek Inc.
LinkIt 7687 HDK V30 User's Guide
Comments
Use AA or AAA battery source
supporting 3.3V power.
Measures the current flow in
MT7687F.
Use AA or AAA battery source
supporting RTC 3V3 power.
Measures the current flow in the
MT7687F RTC mode.
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