INTRODUCTION
This user’s manual is for the low cost XR21V1412 RS-232 evaluation board. The XR21V1412 is in the RS-232 mode when it is shipped from the factory.

EVALUATION BOARD OVERVIEW
A block diagram of the evaluation board is shown in Figure 1 below..

The primary devices on the XR21V1412 evaluation board are all Exar devices.
• The XR21V1412 is an enhanced 2-ch USB UART.
• The SP6260 is an Exar LDO that regulates the 5V from VBUS to 3.3V that is used
   as the supply voltage of the SP3245 and for the VCC of the XR21V1412.
• The SP3245 is Exar’s RS-232 serial transceiver.