SIM3U1XX-B-DK Silicon_Laboratories, SIM3U1XX-B-DK Datasheet - Page 9

• Manufacturer Part Number: SIM3U1XX-B-DK
• Description: Specifications: Lead Free Status: Lead Free ; RoHS Status: RoHS Compliant
• Manufacturer: Silicon_Laboratories

4.6. Power LEDs (DS1, DS2)
The two power LEDs provide visual feedback when the board is powered. When the System Power Select Switch
is in the USB position, the PWR USB LED (DS1) will turn on when the device is powered over USB or by
connecting a power supply to any power header on the board. When the System Power Select Switch is in the MB
position, the PWR MB LED (DS2) will turn on when the device is powered by a UDP Motherboard.
4.7. Imeasure Jumpers (J14, J15, J17)
The USB (J14), VDD (J15), and VIO (J17) Imeasure jumpers allow for easy access to measure the supply current
of the MCU. The shorting blocks for these headers are populated by default. To measure the supply current,
remove the corresponding shorting block and connect a current measurement device across the unpopulated
header.
4.8. VIOHD Selection Jumper (J18)
The VIOHD jumper allows for the VIOHD pin on the MCU to be connected to the VIO power supply, the HV1 signal
from the UDP Motherboard, or to an external power supply. The HV1 option is only available if the MCU is
connected to a UDP Motherboard. To power from an external supply, remove the shorting block and connect the
supply to pin 2 of the header.
4.9. UART VCP Connection Options (J10)
The MCU card features a USB virtual COM port (VCP) UART connection via the mini-B USB connector (J10)
labeled “COM PORT”. The VCP connection uses the CP210x USB-to-UART bridge chip. The GPIO pins
connected to the CP210x device can be enable or disabled when connected to a UDP Motherboard as necessary.
When the MCU card is not connected to the UDP Motherboard, the TX, RX, CTS, and RTS signals are all
connected to the CP210x device. Table 3 shows the GPIO pins that are routed to the CP210x or UDP
Motherboard.
4.10. USB Connection Options (J13)
The MCU card features a USB connection via the mini-B USB connector (J13) labeled “Device USB”. The USB
connector is provided to facilitate connections to the USB interface on the SiM3U1xx. Table 4 shows the J13 pin
definitions.
4.11. Debug Header (J31)
The mini 10-pin debug header supports the Silicon Labs USB Debug Adapter. This connector provides a Serial
Wire (SW) debug connection to the SiM3U1xx on the MCU card.
Table 4. USB Connector Pin Descriptions
Table 3. CP210x Controlled GPIO Pins
GPIO Pin
PB1.12
PB1.13
PB1.14
PB1.15
Pin
1
2
3
4
User Control Function
User Control Function
Rev. 0.2
VBUS
GND
CTS
RTS
RX
TX
D+
D-
UDP SiM3U1xx
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