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2) RTC interrupt mode button (S4). When the system is in the RTC mode, push the button to wake up the
system.
3) External interrupt button (S5). Users can configure GPIO0 as an external interrupt pin. Press the button to
wake up the system from the sleep mode.
4.5.
Extension connectors
The LinkIt 7687 HDK provides similar pin-out to Arduino UNO with extension connectors (J32 to J36) for various
sensor and device connectivity, as shown in Figure 6.
Ref
J36
J35
Signal
Signal
1
GPIO4
GPIO35
2
GPIO5
GPIO34
3
GPIO7
GPIO33
4
GPIO24 GPIO6
5
GPIO25 GPIO1
6
GPIO26 GPIO0
7
GPIO2
GPIO37
8
GPIO3
GPIO36
9
10
The board has 28 GPIOs multiplexed with other interfaces. Depending on the use case, user can configure each I/O
functionality.
Pin alias
Name
UART1_RTS_CM4
GPIO0
GPIO[0]
PWM[0]
EINT[0]
UART1_CTS_CM4
GPIO1
GPIO[1]
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.
J34
Signal
J36
GPIO27
GPIO28
NA
J35
GND
GPIO31
GPIO30
J34
GPIO29
GPIO32
GPIO39
GPIO38
Figure 6. Arduino and 8-pin extension connector
Table 4. GPIO pin multi function definition
© 2015 – 2016 MediaTek Inc.
LinkIt 7687 HDK V30 User's Guide
J33
J32
Direction
Description
O
UART1 RTS (Cortex-M4)
I/O
General purpose input, output
I/O
Pulse-width-modulated output
I
External interrupt
I
UART1 CTS (Cortex-M4)
I/O
General purpose input, output
Ref
J32
J33
Signal
Signal
1
NA
GPIO60
2
3.3V
GPIO59
3
Reset
GPIO58
4
3.3V
GPIO57
5
5V
GPIO28
6
GND
GPIO27
7
GND
8
NA
Page 13 of 23
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