MediaTek LinkIt™ Smart 7688 Developer's Guide
© 2015, 2016 MediaTek Inc.
Page 23
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2)
Next, you will move a resistor by unsoldering and soldering it to a lower position as shown
in Figure 9, after you’re finished moving the resistor, restart the device and you should be
able to access JTAG mode.
Figure 9 Moving a resistor to access JTAG mode
2.3.10.
Specifications
The key specifications of the LinkIt Smart 7688 Duo development board are shown in Table 8.
Category
Feature
LinkIt Smart 7688 Duo
MPU
Chipset
MT7688AN
Core
MIPS24KEc
Clock speed
580MHz
Working voltage
3.3V
MCU
Chipset
ATmega32U4
Core
Atmel AVR
Clock speed
8MHz
Working voltage
3.3V
PCB Size
Dimensions
60.8 x 26 mm
Memory
Flash
32MB
RAM
128MB DDR2
Power Source
USB Power
5V (USB micro-B)
VCC
3.3V (Pin Breakout)
GPIO
Pin Count
3 (MT7688AN)
24 (ATmega32U4)
Voltage
3.3v
PWM
Pin Count
8 (ATmega32U4)
Voltage
3.3v
Max. Resolution
16 bits (customizable)
Maximum Frequency@
Resolution
31.25kHz@8-bit
Timer 0 (4 sets)
2MHz@2-bit
122Hz@16-bit