4 Modes of Operation

The EV14Y33A 2-lead XSFN mikroBUS™-compatible socket board can be configured for either 3.3V or 5V operation through the use of a 0Ω resistor.

Power Selection

Users can select either 3.3V or 5V power from the interface header by installing a 0Ω resistor at one of the following locations:

R1 installed: Connects the 3.3V power source (default configuration)
R2 installed: Connects the 5.0V power source

To switch to 5V operation, remove R1 and install R2. Before enabling 5V operation, verify that the host microcontroller board supports 5V.

Important: R1 and R2 must never be populated at the same time.

Modes of Operation

The board operates exclusively in SWI-PWM mode. Only parasitically powered devices are supported. The table below outlines the configuration for SWI-PWM mode.

Table 4-1. Modes of Operation
Interface Type	Devices
SWI-PWM⁽¹⁾	Security Devices ECC206 – Asymmetric Cryptography SHA106 – Symmetric Cryptogrpahy

Note:

Additional devices may be released in the future.

In SWI-PWM mode, communication is handled via a PWM signal over a single wire. The SIO_2 line, accessible through J2 pin 1, is used for this purpose. There is a 1-kΩ pull-up resistor (R3) on SIO_2.

Parasitic Power

Parasitically powered devices do not require a dedicated power source. An internal capacitor provides the necessary decoupling and charge storage for proper operation. To ensure correct operation, the SIO signal must always remain above the device’s minimum supply operating voltage. For further details and recommendations, refer to the specific device data sheet.