3.1 Powering the CEC173x Evaluation Board

The CEC173x Evaluation Board can be powered directly through the USB micro-B port of the USB-Serial converter (P2 and/or P3). The 5V input from the USB voltage rail is regulated to 3.3V by an MCP1826S voltage regulator.

Optionally, the CEC173x Evaluation Board can be powered by an external power supply through the Power Plug (P1). The 5V is regulated to 3.3V, which is the same as using USB micro-B port. This option is selected by J1 1-2; the default is 2-3 power through USB.

A shunt diode (D1) can be used to allow measurement of the total system power consumption when using the USB micro-B port, or a jumper (J1) is provided to allow measurement of the total system power consumption when using an external power supply.

When the board is powered, LED1 (+5V), LED2 (+3.3V) and LED3 (+1.8V) turn on.

LED9, LED10 and LED11 can be blinking depending on the MEC1723 Firmware Application, which indicates that the MEC1723 Firmware is loaded and executing.

LED4, LED5, LED6 and LED12 can be blinking, indicating that the CEC1736 Soteria Firmware is loaded and executing.

Power-up as shown below: