Silicon Laboratories UDP C8051F370, User Manual

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C 8 0 5 1 F 3 9 x / F 3 7 x
14 Rev. 0.2
6. Using the C8051F39x with the UDP Motherboard
6.1. VBAT Selector Switch
When used with the UDP motherboard, the motherboard can power the C8051F39x MCU card. With the VBAT
selector switch in the VREG position, the motherboard powers the regulator on the card. With the VBAT selector
switch in the UDP position, the UDP motherboard powers VBAT directly. This position supports software control of
the variable voltage power supply and current measurements.
The S1 switch on the UDP motherboard selects between the fixed or programmable voltage. The variable supply is
controlled by the C8051F384 board control MCU through the U1 digital potentiometer. Use the fixed supply when
the variable supply is not under software control.
6.2. MCU Card Header Connections
The C8051F39x MCU card has four connectors with 100 pins each. These 400 pins are directly tied to the UDP
motherboard and I/O cards. These signals are named and designed to support a wide variety of features and
applications, and the UDP C8051F390/F370 MCU Card 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 MCU card slot includes the following components:
J1 MCU card connector H1
J2 MCU card connector H2
J3 MCU card connector H3
J4 MCU card connector H4
The C8051F39x MCU card implements the signals described in Table 3, Table 4, Table 5, and Table 6 in the
Appendix.