Bluegiga Technologies Oy
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5.3 SPI
SPI interface is connected to J9 and can be used for firmware and parameter updates
5.4 UART
The UART interface is available through 3 Mbps RS232 transceivers (MAX13235EEUP) from J5. UART
signals are also available in the header J6 which is connected directly to the pins of the module. UART
transceiver can be disabled using SW1 and SW3. Setting these to position OFF sets the transceivers to high
impedance enabling the use of the signals through the header J6.
5.5 PCM Codec and Audio Interface
The audio interface is available through 3.5mm jack connectors. The PCM codec is a linear 13 bit W681360.
5.6 PIO Configurations and Using the PIO Buttons
All the PIOs are available on the push buttons. One should however note that the PIOs are also used in other
purposes in the board. Following table shows the PIO configurations in the evaluation board and instructions
for using the buttons
PIO line HW connection in the evaluation
board
Switch position in order to use
the button
PIO2 USB pull-up SW13 (USB MODE) to position 1:
self-powered
PIO3 UART DTR SW3 (DISABLE DTR;DSR;CD) to
position OFF
PIO4 UART CD SW3 (DISABLE DTR;DSR;CD) to
position OFF
PIO5 UART DSR SW3 (DISABLE DTR;DSR;CD) to
position OFF
PIO6 LED through SW5 / USB detect SW5 to position 2 or 3 (PIO6 to
header) and SW13 (USB MODE)
to position 1: self-powered
PIO7 LED through SW5 SW5 to position 3 (PIO7 to header
Table 2: PIO Configurations
