User`s guide

UDP SiM3U1xx
Rev. 0.2 11
4.15. MCU Card Default and Optional Connections
The MCU card has many default and optional connections for use with different I/O cards and the UDP
motherboard. The default connections are via shorting jumpers. The shorting jumpers are a 603 resistor footprint
with a cut trace between pads. To disconnect, cut the trace with a sharp utility knife. To reconnect, install a 0 603
resistor or connect the two pads with solder. The optional connections are non-populated (no-pop) resistor
footprints. To connect, install a 0  603 resistor or connect the two pads with solder. The User Control ON
connections are only enabled when the User Control switch is moved to the ON position.
Table 6 shows a summary of the default and optional connections for each pin.
Table 6. MCU Pin Functions
MCU Pin
MCU Card Function UDP Motherboard Signal
Default Optional
User Control
ON
Default Optional
P0.0 USART_TX_A
P0.1 CAPSENSE
USART_RX_A
P0.2 CAPSENSE
USART_RTS_A
C2D_TX00_A
P0.3 CAPSENSE
USART_CTS_A
C2D_TX01_A
P0.4 CAPSENSE
USART_UCLK_A
C2D_TX02_A
P0.5
SPI_SCK_EZR
C2D_TX03_A
P0.6
SPI_MISO_EZR
C2D_TX04_A
P0.7
SPI_MOSI_EZR
C2D_TX05_A
I2V_INP_A
P0.8
SPI_NSS0_EZR
C2D_TX06_A
I2V_INN_A
P0.9 RTC1
GPIO14
P0.10 RTC2
GPIO15
P0.11
VREFGND GPIO11
ADC_VREFGND
P0.12
VREF GPIO12
ADC_VREF
P0.13
IDAC PCA_CH0_A
GPIO13
IDAC_B
P0.14
PCA_CH1_A
I2SOUT_DFS_A
IDAC_A
P0.15 XTAL1
I2SOUT_CLK_A
CP_OUT_A