BM70 PICTAIL
TM
/PICTAIL PLUS
EVB USER’S GUIDE
2015-2016 Microchip Technology Inc.
DS70005235C-Page 45
Chapter 5. USB-to-UART Converter and Host DUT
This chapter describes the use of the USB-to-UART converter circuit which is available
on the BM70 EVB. The UART interface of the BM70 module on the BM70 EVB can be
connected to the user DUT. The DUT can be a customer board with a host
microcontroller or another BM70 EVB.
5.1
CONNECTING UART TO BM70 EVB DUT
The BM70 EVB has a MCP2200 IC acting as a USB-to-UART converter that connects
the BM70 module to the micro-USB port. The BM70 EVB also has a range of header
pins that connect to the UART I/O pins of the BM70 module. This gives the flexibility to
connect the USB-to-UART converter on the BM70 EVB to another BM70 DUT, or
connect the BM70 EVB test pins directly to another host microcontroller DUT.
Figure 5-1
illustrates how to connect the USB-to-UART converter on the BM70 EVB to
the user BM70 DUT. The pins, HCI_TXD, HCI_RXD, P2_0, V
BAT
, GPIO and GND, are
connected to the DUT. The user can connect a micro-USB cable to a PC and perform
the emulation tool functions, such as firmware or UI update. The P2_0 pin is connected
to the switch SW7 to switch between Application and Test modes.
FIGURE 5-1:
UART CONNECTION TO BM70 EVB DUT
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