Quick Start Manual
Page 10
6 Brief Description of Key Peripherals
Power supply
The Koala EVM is powered by USB or external supply (5v). The board features both a screw terminal (CN20) and
barrel connector (CN18) for external power supply of 5v to supply on board regulators and USB-OTG VBUS.
Regulators provide 3.3v for MCU and peripherals and 1.8v for wireless module.
5v and 3.3v are supplied to WMI connector.
USB
The Koala EVM supports USB-OTG HS. The USB micro connector (CN2) allows the user to connect to a host or
peripheral device in full speed operation without a PC.
A USB mini connector (CN9) is also featured which enables direct communication with a PC by converting USB to
serial (USART).
Camera interface
The Koala EVM features a digital camera interface (DCMI connector) to acquire images from a camera accessory.
Single frame or continuous capture is supported in an 8 to 12 bit parallel interface. Crop and several image formats
are also supported by the MCU.
The DCMI interface is most compatible with OV9655 cameras.
Figure 11: OV9655 camera connected to DCMI port
LCD Interface
The Koala EVM Board includes an interface for a LCD module with touch screen.
Display is controlled through the FSMC interface. Touch screen data is read through SPI interface and GPIOs are
used for touch screen interrupts.
The connector assumes a LCD controller IC is built into the LCD module.
To use the LCD, a jumper must be placed across CN21 pins 2 and 3, as illustrated in Figure 5.
CAN Bus
The Koala EVM utilizes a driver (SN65HVD230) to interface to an external CAN Bus. This allows the MCU to create
a node on the bus and communicate with other peripherals in an automotive setting.
Ethernet
The Koala EVM features an Ethernet interface and physical layer (DP83848I), allowing it to connect to a wired
network for communicating with other LAN devices.
