C8051F850-DK-UG Datasheet, PDF (12/36 Pages) Silicon Laboratories – UDP C8051F850 MCU CARD USER’S GUIDE FOR C8051F85X/86X MCUS

C8051F850-DK-UG
5.12. Electronic Board ID (EBID) (U1, J35)
The MCU card has a unique ID that can be read out from the Silicon Labs C8051F990 MCU (U1). This MCU
enables software tools to recognize the connected hardware and automatically select the appropriate firmware
image.
The EBID device uses two I²C signals to communicate: UDPBUS_SDA_A and UDPBUS_SCL_A. These signals
are connected to P0.6 and P0.7 on the C8051F850 MCU through the J25 header. These signals can be
disconnected from the MCU during power measurements.
Table 5. Terminal Block Pin Descriptions (J25)
MCU Pin
P0.6
P0.7
EBID / UDP Signal
UDPBUS_SDA_A
UDPBUS_SCL_A
5.13. MCU Port Pin Connections
The MCU card has many UDP connections for use with different I/O cards and the UDP motherboard. Table 6
describes all functions connected to each pin on the C8051F850 MCU. All of the UDP connections are made with
populated 0  ohm resistors on the back of the MCU card. To disconnect a signal from the pin, remove the 0 
resistor.
Table 6. MCU Card and UDP Pin Functions
MCU Pin
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P2.0
P2.1
VREF
AGND
UDPBUS_SDA_A
UDPBUS_SCL_A
LED1
LED2
Potentiometer
ADC0.12
ADC0.13
Switch S1
C2D
Switch S2
MCU Card Function or UDP Signal
SPI_SCK_EZR
ADC_VREF
GPIO05
SPI_MISO_EZR ADC_VREFGND
GPIO06
EXT_INT0
SPI_MOSI_EZR
CP_POS_A
EXT_INT1
SPI_NSS0_EZR
CP_NEG_A
UART_TX_SYS
UART_TX_A
UART_RX_SYS
UART_RX_A
WAKEUP0
UART_RTS_SYS UART_RTS_A I2C_SDA_EZR
UART_CTS_SYS UART_CTS_A I2C_SCL_EZR
ADC_IN0
CP_OUT_A
ADC0.9
ADC_IN1
CP_OUTA_A
ADC0.10
ADC_IN2
CLKOUT0
PCA_CH0_A
ADC_IN3
PCA_CH1_A
GPIO02
PCA_CH0_B
WAKEUP1
GPIO03
PCA_ECI_A
TIMER_CT_A
GPIO04
TIMER_CT_B
GPIO01
GPIO00
EPCA_CH1_MOTOR
EPCA_CH3_MOTOR
EPCA_CH5_MOTOR
EPCA_CH0_MOTOR
EPCA_CH2_MOTOR
EPCA_CH4_MOTOR
12
Rev. 0.2