LinkIt 2523 HDK v11 User's Guide
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4.
Hardware Configuration
4.1.
Microcontroller unit
The LinkIt 2523 HDK is powered by MediaTek MT2523G SOC, designed for IoT applications and equipped with
flexible pin assignments for custom applications.
MT2523G SOC is an ARM Cortex-M4 core-based architecture with built-in Bluetooth and Bluetooth Low Energy
connectivity support, GNSS, audio interface, internal PSRAM and flash storage. The LinkIt 2523 HDK provides
peripheral support for the I2C, SPI, UART, ADC, PWM, clock generator, audio and SDMMC interfaces.
LinkIt 2523 platform featured applications include but are not limited to industrial applications and automation,
medical signal processing applications, such as sports physiological signal recording, long term medical data
recording, home automation applications, tracking and safety applications using GNSS.
4.2.
Power
This section describes the power source options for the LinkIt 2523 HDK. The HDK can operate powered by USB or
a battery. To charge the battery, the USB cable has to be connected. The board can enter to sleep mode using the
PSRAM memory. The sleep mode can be enabled or disabled by the software.
The LinkIt 2523 HDK also enables GPIO voltage setting configuration based on the supported components. It also
can supply power to the storage, such as micro SD or eMMC. The HDK supports an active GNSS antenna that
requires a power input, see section 4.2.4, “Powering on an active GPS antenna”.
4.2.1.
Powering up with the USB
Connect a micro USB cable directly to
2523 USB
or
MK20 USB
(see Figure 3) to supply power to the HDK. Set the
jumper J2001 (
system power
) to pin 1 and pin 2, to charge the battery using a USB connector. To boot up the
system without a battery, apply the jumper settings, as shown in Table 1. The jumper J2001 (
system power
)
location is marked in Figure 3, it’s assigned for the power rail source. The main power traces through jumper J2001
to the system.
For the battery criteria of LinkIt 2523 HDK, the capacity between 30mAh to 500mAh is recommended; charging
voltage from USB connector with tolerance between 4.15V to 7V is acceptable. The LinkIt 2523 HDK also supports
powering on the battery with power key, where the system power jumper setting is the same as to charge the
battery.
Table 1. Power input jumpers
Power path switch
Set the jumper J2001 pins to assign the power source from
2523 USB
connector
or
MK20 USB
connector, as shown below.
Set the jumper J2001 pins to get the power source from battery connector
CON2101 (see Figure 18), as shown below.