I 2 S A u d i o I / O C a r d
Rev. 0.1
9
5. Using the I/O Card with the UDP Motherboard
5.1. Current Measurement
The power measurement circuitry on the UDP motherboard consists of a Silicon Labs C8051F351 8051 MCU that
measures both input voltage and current consumption of the MCU card, I/O expander, and radio test card. When
using the I/O card, install a shorting block on the UDP Motherboard J15 and J13 connecting the two left pins
together.
Figure 6. Power Measurement Diagram
5.2. I/O Card Header Connections
The I/O card has four connectors with 100 pins each. These 400 pins are directly tied to the UDP motherboard and
MCU cards. These signals are named and designed to support a wide variety of features and applications, and the
UPIO-USB-AUDIO card implements a subset of these connections.
The MCU cards and I/O cards are designed so that a maximum number of functions are shared between each
card. This allows a particular type of I/O card to be shared amongst all MCU cards that connect to the same
signals.
The I/O card slot includes the following components:
H1
I/O card connector H1
H2
I/O card connector H2
H3
I/O card connector H3
H4
I/O card connector H4
The UPIO-USB-AUDIO card implements the signals described in Table 6, Table 7, and Table 8, Table 9 in the
Appendix.
UDP motherboard
power
to VIO
power
VIO IN power
to Radio card
power
Radio card IN
power
to VDD
power
VDD IN power
J15
J14
J13
C8051F351
JP3
JP2
JP1
R24
R15
R6
